WO2007124170A2 - Système de surveillance d'empreintes réduites utilisant un système laser d'éclairage - Google Patents

Système de surveillance d'empreintes réduites utilisant un système laser d'éclairage Download PDF

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Publication number
WO2007124170A2
WO2007124170A2 PCT/US2007/009921 US2007009921W WO2007124170A2 WO 2007124170 A2 WO2007124170 A2 WO 2007124170A2 US 2007009921 W US2007009921 W US 2007009921W WO 2007124170 A2 WO2007124170 A2 WO 2007124170A2
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WIPO (PCT)
Prior art keywords
light
unit
laser diode
surveillance
recited
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
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PCT/US2007/009921
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English (en)
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WO2007124170A3 (fr
Inventor
David A. Dean
Richard Drumsta
Fred I Yacobelli
Zaydel Wesley
Michelle A. Zaydel-Winowski
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Pursuit Engineering LLC
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Pursuit Engineering LLC
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Publication date
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Publication of WO2007124170A2 publication Critical patent/WO2007124170A2/fr
Publication of WO2007124170A3 publication Critical patent/WO2007124170A3/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING SYSTEMS, e.g. PERSONAL CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B13/00—Burglar, theft or intruder alarms
    • G08B13/18—Actuation by interference with heat, light, or radiation of shorter wavelength; Actuation by intruding sources of heat, light, or radiation of shorter wavelength
    • G08B13/189—Actuation by interference with heat, light, or radiation of shorter wavelength; Actuation by intruding sources of heat, light, or radiation of shorter wavelength using passive radiation detection systems
    • G08B13/194—Actuation by interference with heat, light, or radiation of shorter wavelength; Actuation by intruding sources of heat, light, or radiation of shorter wavelength using passive radiation detection systems using image scanning and comparing systems
    • G08B13/196—Actuation by interference with heat, light, or radiation of shorter wavelength; Actuation by intruding sources of heat, light, or radiation of shorter wavelength using passive radiation detection systems using image scanning and comparing systems using television cameras
    • G08B13/19617—Surveillance camera constructional details
    • G08B13/19621—Portable camera
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
    • H04N23/50—Constructional details
    • H04N23/51—Housings

Definitions

  • the present invention contemplates the application of specialized infrared illumination units in compact and rugged surveillance units.
  • the illumination units facilitate illumination of an area with a laser diode light source that has been diffused by the light diffusion unit, so that the area may be observed by an appropriate camera and shown on a visual display for surveillance purposes.
  • the surveillance unit can be configured such that it is a portable rugged form that is useful in the field and in a first embodiment is in a "rifle form" in which the "barrel" acts as the camera tube and the stock act as stabilizers. In a second embodiment, the surveillance unit is upright instead of in a "rifle” form and may be more appropriate for other field uses.
  • the light diffusion unit of the surveillance system is generally encased in a thermally conductive material that is approximately 6 inches (15 cm) long, 3.0 inches (7.5 cm) wide and 3.5 inches (8.75 cm) high and approximately 2 pounds (0.9 kg), one or more laser diode light sources direct a concentrated light beam at a mirror that then reflects the light into the base of a collimator lens.
  • the collimator lens turns the concentrated beam of light into a plane of light projected normal to the source beam.
  • the radiation field in the form of a "plane" projects the plane of light passes over the path of the concentrated beam of light.
  • This plane of light then passes through a light diffuser that spreads the light in a determined pattern and generally acts as a Fourier transform (or other desirable non-linear transform) for the radiation (light) plane.
  • the intensity of illumination is directly related to the power of the laser diode and the efficiency of the system.
  • Laser diodes in the 10-20 watt range will typically be used, although wattages outside this range can also be used depending on the application.
  • the efficiency of the system depends in large part on the quality of the parts used; however, an efficiency of 65% is readily obtainable and can reach higher efficiencies depending on the type may be reached and quality of various components, needed by the end-user, particularly the lenses.
  • the frequency of the illuminating light can also be varied, but in certain embodiments, it is in the 800- 950 nm range (infrared).
  • a portable laser diode light diffuser that comprises a casing.
  • the casing is comprised of rigid, thermally conductive materials and one or more laser diode light source, where the one or more laser diode light source emits a concentrated beam of light at a predetermined wavelength.
  • a mirror reflects the concentrated beam of light from the laser diode into a collimator lens.
  • the collimator receives the concentrated beam of light and projects the concentrated beam of light into a "plane" of light and then into a diffusion screen, where the diffusion screen spreads the plane of light a predetermined amount.
  • the portable laser diode light diffuser illuminates an area in front of the portable laser diode light diffuser, and the efficiency of the portable laser diode light diffuser is approximately 65% but can go higher. Also, in most embodiments, the path of the plane of light passes over and in an opposite direction to the concentrated beam of light.
  • FIG. 1 illustrates a side view of a first embodiment of the surveillance unit
  • FIG. 2A illustrates a front view of the surveillance unit
  • FIG. 2B is a rear side view of a first embodiment of the surveillance unit
  • FIG. 2C is front-side angle view of a first embodiment of the surveillance unit
  • FIG. 2D is a second front side angle view of a first embodiment of the surveillance
  • FIG. 3A illustrates the details of the base of the surveillance unit
  • FIG. 3B illustrates the details of the base from a second side
  • FIG. 3C illustrates the mountain of the visual display on the base
  • FIG. 4 illustrates a second embodiment of the surveillance unit in a first view
  • FIG.5 illustrates a cutaway view of the light diffuser unit as may be implemented in various units
  • FIG. 6 illustrates a light diffuser unit as may be used in various embodiments
  • FIG.7 illustrates an intensity spread of planar light emitting from a collimated lens as would occur in one embodiment of the present invention.
  • FIG. 1 shows a first embodiment of the invention from a side-view.
  • the invention is a surveillance unit, particularly suitable for night use, but is also usable for other difficult viewing conditions such as fog, smoke, and may even be suitable for underwater use in other embodiments.
  • FIG 1 shows the basic components of the surveillance unit 100, which includes a specially-adapted (infrared) illumination unit IU and a base unit B.
  • the illumination unit IU provides much of the radiation necessary for the improved surveillance, due to the novel radiation distribution features of the illumination unit, which are the subject of US Patent Application 10/978,829, published as 2006-77662, fully incorporated by reference herein.
  • stabilization handles SH(f) and SH(r) which in the first embodiment are in the form of a "gun handle" for easy and versatile handling of the surveillance unit.
  • stabilizers ST which may help form a "tripod" structure so that the unit may be placed in a position for longs periods of time without user effort.
  • the visual screen VS allows for the viewing of the camera unit CAM which is illuminated by the infrared illumination unit IU.
  • a standard LCD display can be used, but specialized LCD units may be chosen based on any specific needs of the end-user. For example, low-power units may be specifically desirable for embodiments of the invention that require use in the field for long durations.
  • the unit may be powered by any of several ways without departing from the scope of the invention.
  • the unit includes a power supply PS and recharge unit RU in the base B of the surveillance unit.
  • FIG. 2A shows the detail of the first embodiment of the surveillance unit 100 from the front view.
  • the illumination unit IU can be seen in more detail and includes and illuminator IL and supporting structural configurations.
  • the illuminator IL is the subject of US Patent Application 10/978,829, filed October 29, 2004 and provisional application 60/522,525, filed October 7, 2004. Most of the text of the application is included herein in the Application below.
  • the camera CAM is located in the from center of the unit in the camera tube CT and as shown in the first embodiments can be a mode of video camera that is capable of viewing under harsh conditions and illuminated by the special infrared radiation, and rugged enough to withstand the environment of the desired end-use of the surveillance unit 100.
  • the unit has features that allow it to be used in the rugged environment.
  • One of the key features is the heat-sinking characteristics of the illumination unit.
  • Thermal dispersion wings TDWs are form the outer portion of the illuminator IL and are generally made of aluminum or other heat dispersion material. In other embodiments, certain plastics may also be used.
  • the optional stabilization structures ST(I) and ST(r) may be folded into the base of the unit 100 and provide the option of placing the unit a "rotating position" in certain embodiments.
  • the stabilization structures ST(I) and ST(r) may also option include upper and lower parts which fold into each other.
  • the base B includes a built-in and optionally removable power source PS.
  • the power source PS is generally charges through a charging unit (see FIGS. 4A-F) and powers the illuminator IL, the camera C and the visual display VS.
  • FIG. 2B provides a rear side view of the assembled surveillance unit 100.
  • the optional folding handle unit FH allows for compact storage of the unit, or for additional maneuverability.
  • the forward stabilization handle SH(f) may also optionally fold up so that it is generally parallel to the base B.
  • the unit 100 is primary made of hard and lightweight durable plastic into which the electrical components may be easily assembles and protected for rugged field use.
  • FIG. 2C is a front-side view of the first embodiment of the surveillance unit 100 and FIG. 2D is an opposite front-side view of the first embodiment.
  • FIGS. 3A and B show the base B and camera tube CT in a disassembled state from the surveillance unit 100 shown in FIGS. 1-2D. Also shown are the particular mounting units.
  • the mounting bracket for the visual display MB(v) may be the single bracket unit as shown, or any time.
  • the illumination mounting bracket MB has adjustable left and right portions MB(I) and MB(r) in which the illumination unit IU may be moved forward or backward over the camera tube CT 1 as is needed for field use.
  • FIG. 3C shows the surveillance unit 100 with the visual display VS mounted, but without the illumination unit IU.
  • FIG. 4 a second embodiment of the surveillance unit 100' is shown.
  • the second embodiment is more 'upright' than the first embodiment, but generally includes all of the same basic components save the stabilization supports and handles.
  • the "upright" model shown in FIG. 4 may be more appropriate for certain types of field uses in which a shorter "footprint" is needed. This may include surveillance uses on vehicles, hand-held models, uses on robots, and other end-use needs that may require a smaller "footprint.”
  • FIGS. 5-7 discuss elements of the illumination unit IU as shown in
  • FIGS 1-4 as may be implemented in the invention.
  • Particular embodiments of the invention are useful in illumination in conjunction with many night-vision technologies or other applicable areas, such as surveillance, search and rescue, robot vision, machine vision, etc.
  • Laser diodes are an excellent source of illumination and can provide radiation for a variety of different spectrums, particularly infrared. Unfortunately, the laser diodes produce a very tight beam of light, which essentially over-illuminates a very small area, as well as creates damage to the human eye.
  • the present invention diffuses the laser diode light beam so that a much larger area can be thoroughly illuminated than would otherwise be possible with laser diode illumination sources.
  • the spreading of the light beam is controlled by a variety of diffusers and lenses, and can be adjusted according to the needs of the user.
  • the size of the laser light diffuser is reduced in comparison to that of the prior art. The reduction is partly accomplished by redirecting the light beam source back over itself as it is being diffused.
  • FIG. 5 one embodiment of a illumination unit IU as used in the embodiments of the invention shown in FIGS. 1-4,.
  • the illumination unit IU illustrated comprises a laser diode source 2 that projects light into a collimator lens 4. In this manner, a single beam of high intensity light is transformed into a plane of projected light 6.
  • the plane of projected light 6 passes out of the light diffuser unit, usually though a diffuser screen 8 to illuminate an area.
  • the laser diode 2 may be of a variety of types, such as an OsramTM diode.
  • the light from the diode is non-collimating, but can also be divergent in particular embodiments.
  • Typical diodes project light as a tight rectangle.
  • a non-collimating diode projects light as an expanding rectangle. The dimensions of the rectangle will vary depending on application, as well as on the internal geometries of the light diffusion unit.
  • the wavelength of the light produced by the diode does not change by being diffused by the light diffusion unit.
  • a single laser diode 2 is used.
  • a plurality of laser diodes can be used in close conjunction with one another.
  • the plurality of laser diodes may be of the same frequency, to produce a stronger projected light, or they may be of a variety of frequencies so that a diffuse light with a greater frequency range is produced.
  • color effects may be accomplished by a second type of laser diode, or may be accomplished by flooding the unit with another type of light external to the illustrated light path.
  • the light diffusion unit will illuminate an area with invisible light, however, a small amount of red spectrum visible light will also be produced. Since red lights have particular meanings in many industries, it may not be desirable to have the light diffusion unit shine red.
  • a second visible light source can be added almost anywhere within the light diffusion unit. For instance, green floods out the red glow, creating an 808 nm invisible light source that also appears to shine green.
  • the second light source unless emitted from a diode and forced through the illustrated pathway, will not illuminate in the same manner as the first.
  • the plurality of laser diodes can be pulsed so that diodes of the same frequency can produce a continuous stream of plane projected light, or at least continuous enough to the human eye or equipment monitoring the light diffuser unit.
  • the pulsing of the diodes reduces their heat output and also increases the life expectancy of the diodes.
  • a light diffuser unit can function at a variety of different states, such that if a stronger light source is required, multiple diodes turn on simultaneously, while a more heat/energy/life conservative mode can be used in default that pulses the diodes.
  • the rate of pulse between the diodes can be changed depending on what is using the light diffuser as a light source. For instance, a camera outfitted with the appropriate filters and lenses for recording the illuminated area, might require more or less pulses of light to function optimaHy(similar to certain machine vision technologies) than the human eye looking through goggles.
  • Efficiency refers to the total intensity of the light as emitted from the laser diode to the total intensity of the light emitted from light diffusion unit.
  • the collimator lens reduces the efficiency of the system by approximately 15% or less.
  • high-efficiency collimators can be made of expensive materials that are labor intensive to produce, but that can increase efficiency.
  • Various types of collimators 4 can be used with the present invention. The basic principle of the collimator is to receive a light source and convert it into a broader column or cone, referred to herein as a plane of light.
  • a diffusion screen 8 As the projected planar light 6 leaves the casing 10, it passes through a diffusion screen 8.
  • the diffusion scatters the light over a broader area, and preferably spreads the light in an even manner, although in some applications, an uneven spreading of the light may be desirable.
  • One type of filter known as a holographic diffuser, generally acts in a non-linear manner (generally as a Fourier transform) and spreads the light in a uniform way or other intended pattern (depending on the Fourier patter) without changing its frequency and without a large impact on the net illumination.
  • Holographic diffusers are generally in the form of a thin polycarbonate film or screen, supplied by POCTM of Torrance, CA.
  • a holographic diffuser will reduce the overall efficiency of the light diffuser unit by 5-8%. Therefore optimizing the spread of the light with fewer light diffusers is preferable. However, as given in an embodiment below, sometimes additional light diffusers are added to improve the light spread so that the overall efficiency is optimized and/or the desirable non-linear transform of the light plane emanates from the system. Other components that reduce efficiency but improve the system as a whole may also be used. For example, putting a protective lens, such as a glass or acrylic lens, over the end of the unit may reduce efficiency by about 2-5%, but will provide protection for the diffusion screen and internal components, and may be part of the end-user's needs, such as manufacturing costs (plastic mold injection, snap-on, etc.). A plastic-mold injection system that can incorporate the holographic diffuser system because of its polycarbonate properties with a tough acrylic lens that can snap into the rigid body is particularly efficient for cost reduction and reduced manufacturing error.
  • a protective lens such as a glass or acrylic lens
  • the casing 10 of the light diffuser is made with rigid, thermally conducting lightweight materials, such as, but not limited to, aluminum.
  • the purpose of the casing 10 is two fold. It provides protection to the instruments within and it diffuses heat (heat sink).
  • the collimator lens 4 and mirrors 12 can be themselves made with a variety of materials, ranging from very fragile to relatively non-fragile, it is still preferred that they not be exposed to impact damage.
  • the surfaces of the collimator lens 4 and mirrors 12 further need to be kept as clean and clear as possible, so that the casing 10 is air tight, and in some embodiments filled with gasses that do not scatter the projected light 6.
  • the casing 10, as illustrated in Fig. 1 has a plurality of fins that further aid in the diffusion of heat without adding significant weight.
  • the casing itself can be a closed system, in that it can be an air tight unit. This would prevent dust and other materials from collecting on the internal surfaces. However, a particular embodiment allows for the flow of air into the unit while filtering dust particles. GortexTM seals are an example of a passive air filter that does not allow in particle contaminants or water.
  • the heat produced from the laser diode can further be dissipated in a number of different ways.
  • a heat sink 16 such as a copper block, which may include up to 100 percent copper (which is preferably not machined directly).
  • heat sinks will increase the weight of the light diffuser unit, there is a trade off between weight and heat diffusion. This trade-off is also dependent on the use of the light diffuser unit. Hand-held models will optimally include a heat sink, while those mounted on machinery could do without. The addition of a heat sink also limits the infrared light pollution that might otherwise contaminate the projected light 6 in some applications.
  • the heat sink itself might have an interface between itself and/or the diode and the casing.
  • indium foil can be placed between the diode and a copper block to improve dissipation.
  • other materials such as Wakefield Thermal Compound heat conductive grease can be used between the heat sink and the casing.
  • Fans, both internal and external can also be used. An internal fan would optimally blow on or near the laser diode, while an external fan would supply air to the internal space.
  • thermal electric coolers or TE coolers can be used to move heat from the heat sink to the external housing for greater heat transfer.
  • a mirror 12 reflects the laser diode light to the collimator lens 4.
  • the light emitted from the laser diode 2 needs to travel a certain distance before contacting the collimator lens 4.
  • the light is able to travel the required distance, but the space required in the light diffusion unit is essentially halved. This allows for the size of the light diffusing unit to be greatly reduced.
  • the light from the diode travels approximately 2-3 inches (5-7.5 cm) to the mirror and then a short distance to the collimator lens.
  • the use of a mirror in this manner will reduce the overall efficiency by approximately 1% to 5% or even less depending on the quality of the mirror.
  • the angles of the mirror in relation to the diode can be adjusted depending on what angle the diode is in relation to the collimator lens originally.
  • the light from the diode is changed by a 90° angle before contacting the collimator lens. Without the mirror, the laser diode needs to hit the collimator lens directly from below, however, the diode cannot be positioned too close to the lens. This is because the light from the diode needs to travel a certain distance so that proper spread is achieved. Also, the heat from the diode may damage some types of lenses.
  • the light beam produced by a laser diode is passed back over itself as it is being diffused. The figures therefore have a sense of "up" for clarity.
  • Fig. ⁇ A and 6B the light path is illustrated from a side view as well as from above.
  • One or more laser diodes 2 provide a concentrated beam of light 3 that reflects 90° in a mirror 12 to the base of a collimator lens 4.
  • the concentrated beam of light 3 is naturally a tight beam as it emerges from the diode; however, some diodes produce a slightly rectangular beam, which aids in the diffusion.
  • the light may first pass through a first holographic diffusing film 14 which properly spreads the emitting light, generally through a non-linear (usually Fourier) transform. Although passing the light through additional mediums or multiple diffusers reduces overall light efficiency, at this stage it is more desirable to fill the base of the collimator lens. If the concentrated beam of light is produced from a non- coHimating laser diode, then this step may not be necessary.
  • a first holographic diffusing film 14 which properly spreads the emitting light, generally through a non-linear (usually Fourier) transform.
  • the concentrated beam of light 3 reflects in the mirror 90° to then strike the base of the collimator lens.
  • the position of the laser diode 2 to the mirror 12 can vary depending on the type of diode used, but is approximately 2-3 inches (5-7.5 cm). Also, in Figs 6A and 6B, the laser diode is positioned straight at the mirror. However, if multiple laser diodes are being used, the diodes would need to be staggered so that the light strikes the mirror at an angle. The change in the light angle after striking the mirror would still be 90° with respect to the vertical, but there would also be a slight shift in regards to the horizontal as well so that the concentrated beam of light strikes the collimator lens at about the center of its base.
  • the concentrated beam of light 3 strikes the base of the collimator lens 4, the light is diffused into a plane of light 6 at a 90° from which it was received.
  • the plane of light 6, also referred to as projected planar light, is described as such since photons traveling in it are traveling in the same direction and are fairly evenly distributed.
  • the plane of light 6 is then spread by a diffusion screen 8.
  • the diffusion screen in most embodiments spreads the light in a uniform manner, though horizontal spreading may be favored over vertical spreading for certain applications and vice versa, as described above.
  • a portable light diffusion unit can vary, but in one embodiment the external casing is approximately 6 inches (15 cm) long, 3.0 inches (7.5 cm) wide and 3.5 inches (8.75 cm) high.
  • the weight of the unit can vary, but in the embodiments illustrated is approximately 2 pounds (0.9 kg), with approximately 6 ounces (0.17 kg) of that weight being the heat sink.
  • the invention has been applicable to any type of light.
  • particular embodiments of the invention are used in conjunction with night vision technologies.
  • Light in the range of approximately 800 to 950 nm is particularly useful for this application, though other ranges can also be used.
  • 808 nm wavelength light is essentially invisible, although a dull red glow may still be seen.
  • 915 nm wavelength light is even more invisible to the human eye.
  • night vision equipment such as a WatchTM CCD black and white camera, reads light at the 808 nm range better than the 915 nm range.
  • the wavelength can be varied depending on the corresponding night vision equipment. Some light diffusion units may even have multiple wavelength applications. Other wavelengths may be desirable in trying to make the light invisible to different types of animals for nighttime zoological studies.
  • the intensity of invisible light is measured in watts, which is directly a result of the power intensity of the laser diode being used.
  • an 808 nm laser diode that is powered at 10 to 20 watts will produce, at 65% efficiency, a 6.5 to 13 watts diffuse light.
  • Diodes of 7-20 watts and even greater, will typically be used with the present invention, although different intensity diodes can also be used.
  • FIG. 7 a typical distribution of the intensity of planar light emitted from a collimator lens 4 is shown.
  • This is a front on view of an embodiment of a collimator lens 4 showing that although the planar light is described above as substantially evenly distributed, areas of intensity are often still present.
  • the planar light will be more intense towards the base of the collimator lens, with a gradual decrease in intensity moving up the lens.
  • the intensity change is not abrupt, it does tend to resemble a Gaussian curve 5, or a double Gaussian curve if two light sources are being used.
  • the present invention is described as illuminating an area in front of the light source, whether with visible or invisible light, like any strong light source area, the sides and even behind the light source become illuminated as the light reflects off of the surfaces.
  • the present invention provides for a portable laser diode light diffuser that comprises a casing, where the casing is comprised of rigid, thermally conductive materials and one or more laser diode light source.
  • One or more of the laser diode light sources emits a concentrated beam of light at a predetermined wavelength.
  • a mirror reflects the concentrated beam of light from the laser diode into a collimator lens.
  • the collimator receives the concentrated beam of light and projects the concentrated beam of light into a plane of light and then into a diffusion screen, where the diffusion screen spreads the plane of light a predetermined amount.
  • the portable laser diode light diffuser illuminates an area in front of the portable laser diode light diffuser.
  • the efficiency of the portable laser diode light diffuser is approximately 65%. Also, the path of the plane of light passes over and in an opposite direction to the concentrated beam of light.
  • the mirror is positioned approximately 3 inches (7.5 cm) from the laser diode light source.
  • the casing is composed of aluminum and may have fins to aid in thermal conductivity and also a controlled air intake.
  • the diffusion screen is a holographic diffusion screen. The diffusion screen spreads the plane of light, such as 10° up and down and 20° side to side. However, it can be appreciated that positions and spreads may be adjustable and dimensions scalable, depending on the end uses and the energy requirements of the device.
  • the casing is approximately 6 inches
  • the predetermined wavelength is invisible to the human eye, such as 800-950 nm.
  • an additional light source is present within the casing to flood visible light produced by the laser diode.
  • the diode is mounted to a heat sink, such as copper, which may include up to 100 percent copper that also may be non- machined.
  • multiple laser diodes are used. These laser diodes may pulse at different times, providing a continuous stream of light to the collimator lens, or they may be activated together to provide an enhanced beam of light to the collimator lens.
  • the laser diodes may all be of the same wavelength or they may have different wavelengths.
  • the present invention provides for a laser diode light diffusion unit that comprises a laser diode, a mirror and a collimator lens.
  • the laser diode produces a concentrated beam of light that reflects in the mirror into the base of the collimator lens, where the collimator lens converts the concentrated beam of light into a plane of light that is projected over and in an opposite direction to the path of the concentrated beam of light.
  • the embodiment may also use a first holographic diffusion screen present between the laser diode and the mirror that spreads the concentrated beam of light such that the concentrated beam of light fills the base of the collimator lens.
  • the laser diode is a non-collimating laser diode.

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Abstract

La présente invention concerne une unité de surveillance sous la forme d'un 'fusil' ou tenue à la main à la verticale, comportant une caméra qui est éclairée par une unité de lumière à diode laser comprenant un boîtier avec un capuchon de lentille qui maintient une diode laser montée sur un dissipateur de chaleur, un miroir, une lentille collimatrice et un écran à diffusion holographique. Le boîtier de diffusion est réalisé en un matériau rigide conducteur de chaleur, et le dissipateur de chaleur est monté au sein du boîtier de sorte qu'un faisceau de lumière concentré produit par la diode laser soit dirigé vers le miroir. Le faisceau de lumière concentré dirigé vers le miroir est réfléchi à environ 90° dans la base de la lentille collimatrice où la lentille collimatrice convertit le faisceau de lumière concentré en une plan de lumière qui est projeté sur et dans une direction opposée au trajet du faisceau de lumière concentré. Le plan de lumière traverse ensuite l'écran à diffusion holographique, où l'écran à diffusion holographique étale le plan de lumière à des angles prédéterminés qui traverse ensuite le capuchon de lentille et hors du boîtier de sorte que la caméra puisse permettre à une personne de voir de nuit, dans la fumée, le brouillard ou d'autres conditions défavorables. La caméra est contenue dans une unité robuste en matière plastique sur un socle, auquel l'unité de visualisation est également fixée. Le socle comporte une alimentation électrique rechargeable. Des stabilisateurs facultatifs permettent le placement de l'unité de surveillance dans des endroits stratégiques.
PCT/US2007/009921 2006-04-24 2007-04-24 Système de surveillance d'empreintes réduites utilisant un système laser d'éclairage Ceased WO2007124170A2 (fr)

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CN103839371A (zh) * 2014-03-31 2014-06-04 内蒙古科技大学 一种室内无人值守安全巡检系统
CN111437549A (zh) * 2020-05-06 2020-07-24 陈关成 一种消防机器人用伸缩防护装置

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Publication number Priority date Publication date Assignee Title
CN103839371A (zh) * 2014-03-31 2014-06-04 内蒙古科技大学 一种室内无人值守安全巡检系统
CN103839371B (zh) * 2014-03-31 2016-01-13 内蒙古科技大学 一种室内无人值守安全巡检系统
CN111437549A (zh) * 2020-05-06 2020-07-24 陈关成 一种消防机器人用伸缩防护装置
CN111437549B (zh) * 2020-05-06 2021-11-05 杜金 一种消防机器人用伸缩防护装置

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