JPH051948A - Two-dimensional scanning fire detector and installation position adjustment method - Google Patents

Abstract

(57) [Summary] (Modified) [Purpose] A two-dimensional scanning type fire detector that detects radiant energy from a fire flame while two-dimensionally scanning the surveillance area to judge a fire. The positioning of the detector with respect to is highly accurate and easy. A two-dimensional scanning fire detector that scans a monitoring area through a detection window 7 by a rotating mirror 3 and judges the presence or absence of a fire from a detection signal of radiant energy from the monitoring obtained by the scanning, A light emitting device 12 that emits highly linear visible light is provided in front of the detection window 7, and the visible light beam from the light emitting device 12 is reflected by the rotating mirror 3 to irradiate the monitored area with the bright line of the visible light beam.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a two-dimensional scanning type fire detector for detecting a radiant energy from a flame while two-dimensionally scanning a surveillance area to judge a fire.
The present invention relates to a two-dimensional scanning fire detector that adjusts a reference angle that determines a starting position of three-dimensional scanning so as to match a reference position of a monitoring area, and an installation position adjusting method.

[0002]

2. Description of the Related Art Conventionally, as a two-dimensional scanning fire detector (hereinafter simply referred to as "fire detector"), Japanese Patent Laid-Open No. 62-2558.
The mirror scanning radiation detector shown in No. 32 is known. A schematic configuration of this fire detector is shown in FIG.
The rotary mirror 3 is driven to rotate by a motor 2 attached to the rotary mirror 3. The rotary mirror 3 reflects the optical image of the subject incident from the monitoring area 4 toward the reflection mirror 5, and further reflects the subject optical image reflected by the reflection mirror 5. The image is received by the photoelectric conversion element 6. Although not shown, only the light that has passed through the slit provided between the reflection mirror 5 and the photoelectric conversion element 6 is received by the photoelectric conversion element 6, so that the area of each scanning area is defined. ing.

In the detection operation, the object to be monitored in the monitoring area 4 is scanned along the vertical direction Y by rotating the rotary mirror 3 at a predetermined angular velocity, and a predetermined rotation angle is obtained every time one scan in the vertical direction Y is completed. The casing 1 is rotated in the X direction by another drive motor (not shown). By scanning the object to be monitored in the monitoring area 4 along the vertical direction Y with this rotating mirror 3, a so-called dot-sequential scanning is performed within a scanning area into which the monitoring area 4 is finely divided, and the photoelectric conversion element 6 scans the area. Photoelectric conversion is performed to a detection signal according to the intensity of the radiant energy, and the detection signal is compared with a reference value to determine which scanning area in the monitoring area the fire occurred.

The position of each scanning area obtained by subdividing the monitoring area is represented by a horizontal scanning angle θ and a vertical scanning angle α with respect to the reference position of the fire detector. Therefore,
When deciding the monitoring area, for example, the data of viewing the warning area from the installation position of the fire detector shown in FIG. 9 is required. FIG. 9 shows the stadium as a monitoring area. The horizontal axis represents the horizontal scanning angle θ of the fire detector, and the vertical axis represents the vertical scanning angle α of the fire detector. Θ = 0 to 180 degrees, α = It is the contour line data of the monitoring area which is visible at an arbitrary scanning angle (θ, α) of 0 to 90 degrees.

Such data of FIG. 9 can be created from the design data of the surveillance area, and each scan section (θ, θ, which enters the surveillance area using the data of FIG. 9 can be used without waiting for the completion of the structure.
α) can be defined. By the way, when the fire detector 100 in which each scanning section is defined based on the data of the monitoring area viewed from the detector as shown in FIG. 9 is actually installed as shown in FIG. Fire detector 1 such that what is visible on the reference line of the reference horizontal scanning angle, for example, θ = 90 degrees is actually visible from the position of the horizontal scanning angle θ = 90 degrees.
00 must be repositioned.

Therefore, conventionally, as shown in FIG. 10, a sighting scope device 102 is attached to the side of the fire detector 100,
For example, the position of the fire detector 100 is adjusted so that the center of the pillar 104 at the reference position can be seen on the vertical aiming line 106 of the scope surface of the aiming scope device 102 shown in FIG. The output of the angle sensor is adjusted so that θ = 90 degrees.

This alignment work is a work directly related to the accuracy of identifying the fire position of the fire detector, and high accuracy is required. For example, even if the horizontal scanning angle θ is deviated by only 0.5 degrees, a large deviation of 1.75 m occurs at a distance of 200 m.

[0008]

However, in the adjustment of the installation position using the conventional sighting scope device, there is an optical relationship with the rotating mirror of the fire detector to which the radiant energy from the fire is incident. Since it relied on a non-aiming scope device, the horizontal scan angle at which the radiant energy was incident and the horizontal scan angle of the aiming scope device had to be perfectly parallel. For this reason, processing accuracy and mounting accuracy of the sighting scope device are required, resulting in high cost, and the mounting angle may shift during transportation or installation work.If this shift cannot be found, Had a problem that the accuracy of position identification of the fire detector was significantly deteriorated.

The present invention has been made in view of the above-mentioned conventional problems, and a two-dimensional scanning fire detector capable of accurately and easily aligning the detector with a reference position of a monitoring area and its installation. It is an object to provide a position adjusting method.

[0010]

To achieve this object, the present invention is constructed as follows. The reference numerals in the drawings of the embodiments are also shown. First, the present invention is a two-dimensional scanning type fire detection in which the rotating mirror 3 scans the surveillance area 4 through the detection window 7 and the presence or absence of a fire is judged from the detection signal of the radiant energy from the surveillance area obtained by this scanning. Target the vessel.

In the present invention as such a two-dimensional scanning fire detector, a light emitting device 12 for emitting a highly linear visible ray is provided in front of the detection window 7, and a visible light beam from the light emitting apparatus 12 is provided. Is reflected by the rotating mirror 3 to irradiate the monitoring area with the bright line of the visible light beam. Here, the light emitting device 12 is attached to the detector housing 1 so that the photoelectric conversion element 6 for photoelectrically converting the radiant energy from the monitored area can receive the visible light beam received by the light emitting device 12.

A beam splitter 14 is provided in the optical path from the rotary mirror 3 to the photoelectric conversion element 6, and a visible light beam is incident on an adjusting light receiving element 15 having sensitivity in the wavelength band of visible light, and the adjusting light receiving element is received. The light emitting device 12 is attached to the detector housing 1 so that the visible light beam can be received from the detector 15.
Attach to. Further, the light emitting device 12 includes, in addition to the adjusting light emitting element 13 that emits the visible light beam, the adjusting light receiving element 16 that receives the reflected light of the visible light beam by the rotating mirror 3.
A slit 17 is arranged in front of the adjusting light emitting element 13 and the adjusting light receiving element 16 so that the light receiving output of the visible light beam reflected by the rotating mirror 3 can be obtained from the adjusting light receiving element 16. The light emitting device 12 is attached to the detector housing 1.

Furthermore, a light emitting device 12 for emitting visible light having high linearity is provided on the front surface of the detection window 7, and the light emitting device 12 is provided.
As a method for adjusting the installation position of the two-dimensional scanning type fire detector that reflects the visible light beam from the rotating mirror 3 to irradiate the bright line of the visible light beam to the monitoring area, the visible light emitted from the two-dimensional scanning type fire detector It is characterized in that the bright line of the light beam is adjusted so that the horizontal scanning angle of the two-dimensional scanning fire detector becomes the reference angle at a position where it passes through a predetermined reference target in the warning area.

[0014]

According to the two-dimensional scanning fire detector and the installation position adjusting method of the present invention having such a configuration, the visible light beam from the light emitting device mounted on the two-dimensional scanning fire detector is rotated by the rotating mirror. The bright line passes through a target such as a pillar that indicates the reference position in the caution area, and in this state, the angle signal from the sensor that detects the horizontal scanning angle of the fire detector, for example, the rotary encoder becomes the reference angle. The adjustment work is simple and highly accurate.

With respect to the positional relationship between the light emitting device and the rotating mirror, if the optical axes of the two are mounted so as to be aligned in a straight line as viewed from above, the visible light beam is incident vertically on the rotating mirror, which is highly accurate. The position can be adjusted. For example, if the detection signal of the visible light beam is adjusted so as to be obtained from the photoelectric conversion element, it can be aligned.

[0016]

1 is a block diagram of an embodiment showing a first embodiment of the present invention. In FIG. 1, 1 is a detector housing of a two-dimensional scanning fire detector, and a detection window 7 is opened in the front part of the detector housing 1. Of course, the detection window 7 is hermetically closed by glass or the like.

A rotating mirror 3 which is rotated at a constant angular velocity by a motor (not shown) is provided in the detector housing 1. The rotating mirror 3 reflects the optical image of the subject incident from the monitoring area obtained via the detection window 7 toward the reflecting mirror 5 side via the condenser lens 8. The subject optical image reflected by the reflection mirror 5 is incident on the photoelectric conversion element 6 via the slit 9 and the relay lens 10, and the photoelectric conversion element 6 outputs a detection signal corresponding to the radiation energy of the subject optical image in the monitoring area. .

A detection signal from the photoelectric conversion element 6 is given to a microprocessor of a control device installed separately, and compared with a reference value by program control of the microprocessor, and when it exceeds the reference value, it is judged that a fire occurs. In the comparison judgment of the detection signal and the reference value, the detection signal is multiplied by the correction coefficient corresponding to the distance to the detection position, and the fire judgment is performed by removing the influence of the attenuation of the light energy due to the distance. Of course, the same applies if the reference value is corrected according to the distance.

The subject optical image incident on the photoelectric conversion element 6 becomes an area limited by the slit 9, and the slit 9
Determines the size of each scanning area in the monitoring area 11. The detector housing 1 is installed on the base 20, and the base 20
A motor is built therein, and the detector housing 1 is attached to a support base 22 of a rotary shaft 21 of the motor by a shaft 23 so as to be rotatable and adjustable in a vertical direction. The rotating shaft 21 reciprocally rotates the detector housing 1 horizontally, for example, in a range of 0 to 180 degrees, by a motor in the base 20. In addition, in the actual installation state,
As shown in, the vertical scanning range is from 0 ° directly below to 90 ° horizontally.

In addition to the structure of such a two-dimensional scanning fire detector, in the present invention, the light emitting device 12 is mounted on the front side of the detection window 7 of the detector housing 1. The light emitting device 12 is provided with a light emitting element 13 for adjustment.
Emits a highly linear visible ray to the rotating mirror 3. As the light emitting element 13, it is desirable to use, for example, a semiconductor laser that emits laser light.

Further, the light emitting device 12 is provided as a separate unit that can be attached to and detached from the detector housing 1, and in addition to the light emitting element 13, a drive circuit for the light emitting element 13, a power switch and the like are provided. In addition, the light emitting device 12 for the detector housing 1
The positioning can be uniquely performed by previously providing a positioning pin or the like. Further, the direction of the visible light beam from the light emitting element 13 with respect to the rotating mirror 3 can be easily adjusted within a slight range in the three-dimensional direction by the adjusting knob provided on the light emitting device 12.

FIG. 3 is an explanatory view showing the installation position adjusting work of the first embodiment of FIG. In FIG. 3, for the monitoring area 4, for example, as shown in FIG.
The data in which contour lines are drawn with respect to the contour of the monitoring area 4 viewed from the installation position is prepared in advance, and the actual monitoring area 4 by the fire detector 100 is determined based on the data in FIG.

That is, when the monitoring area is not specified,
As shown in FIG. 8, the monitoring area 4 is a rectangular range determined by the horizontal scanning angle θ of the fire detector and the vertical scanning angle α of the rotating mirror 3. Since the actual monitoring area for such a rectangular monitoring area 4 is as shown in FIG. 9, for example, the rectangular monitoring area subdivided by the horizontal and vertical scanning sections (θ, α) is shown in FIG. Only the scanning sections included in the actual monitoring area 9 are valid areas, and the scanning sections outside the actual monitoring area are invalid areas or non-determination areas. Specifically, a memory table of each scanning section is created by subdividing a rectangular monitoring area, and bit 1 is set in this memory table if the section is valid, and bit 0 is set if it is an invalid section (non-determination section). Should be set.

If the actual monitoring area 4 for making a fire judgment can be set on the side of the fire detector 100 as described above, the fire detector 100 is set horizontally, for example, in the actual installation state of the fire detector 100 shown in FIG. The position of the fire detector 100 is adjusted so that, for example, the pillar 104 in the monitoring area 4 that is within the scanning field of view can be seen when the scanning angle θ is 90 degrees. In the position adjustment of the present invention, the light emitting device 12 is mounted on the fire detector 100 as shown in FIG. 1, and the adjusting light emitting element 1 of the light emitting device 12 is mounted.
The rotating mirror 3 is rotated at a constant angular velocity while a visible light beam is emitted from the rotating mirror 3 to the rotating mirror 3.

When the rotating mirror 3 is rotated, the visible light beam from the adjusting light emitting element 13 scans the monitoring area from bottom to top as shown by the arrow as the rotating mirror 3 rotates, and this is repeated. At the same time, the visible light beam from the adjusting light emitting element 13 also enters the photoelectric conversion element 6 through the condenser lens 8, the reflection mirror 5, the slit 9, and the relay lens 10 at a predetermined rotation position of the rotating mirror 3.

As shown in FIG. 3, by scanning the visible light beam from the fire detector 100, as seen from the plan view of FIG. 4, visible from the fire detector 100 toward the center of the reference pillar 104. The bright line 108 of the light beam is emitted. Since this bright line 108 is a visible light beam, the bright line 108 by the visible light beam can be made visible by arranging personnel near the pillar 104 that is the reference position.
Of the fire detector 100 is notified to the coordinator on the side of the fire detector 100 with a transceiver or the like, and when the bright line 108 of the visible light beam passes through the center of the pillar 104, the fire detector 10
Fix the orientation of 0.

Of course, an adjuster on the side of the fire detector 100 may adjust the direction while observing the state of the bright line 108 of the visible light beam with respect to the column 104 with binoculars or the like. If the fire detector 100 is fixed with the bright line 108 of the visible light beam passing through the center of the reference pillar 104, then the fire detector 1
The angle sensor is adjusted so that the output signal of the angle sensor such as a rotary encoder detecting the horizontal rotation angle of 00 becomes a value indicating the reference value θ = 90 degrees.

Here, what is important in the position adjustment shown in FIGS. 3 and 4 is that the visible light beam from the adjusting light emitting element 13 of the light emitting element 12 shown in FIG. It is incident perpendicularly to. That is, the detector housing 1 is arranged so that the optical axis of the visible light beam from the light emitting element 13 and the optical axis of the fire detector 100 side from the rotating mirror 3 to the photoelectric conversion element 6 are aligned on a straight line when viewed from above. On the other hand, the light emitting element 12 must be mounted.

The mounting and positioning of the light emitting element 12 with respect to the detector housing 1 is realized by initial adjustment so that the photoelectric conversion element 6 can receive the visible light beam from the adjusting light emitting element 13. it can. Here, the photoelectric conversion element 6 has a sensitivity in the wavelength band from the infrared region to the far infrared region because the radiant energy due to the fire is detected, while the photoelectric conversion device 6 has a sensitivity in the wavelength band of visible light from the adjustment light emitting device 13. Since the beam is emitted, the received light output of the visible light beam from the photoelectric conversion element 6 is not so large, but if the visible light beam whose wavelength component spreads from the infrared region to the far infrared region is used, it will be sufficient. It can be checked from the received light output of the conversion element 6 whether or not the position adjustment of the light emitting device 12 is correctly performed. Specifically, the detection signal from the photoelectric conversion element 6 may be input to the comparator, and the LED may be turned on by the output of the comparator when the predetermined value is exceeded.

FIG. 5 is a block diagram of an embodiment showing the second embodiment of the present invention. In this embodiment, the visible light beam of the light emitting device 12 is vertically incident on the rotating mirror 3 of the fire detector 100. In order to confirm that the beam splitter 14 is provided, a beam splitter 14 is provided in the optical path from the rotary mirror 3 to the photoelectric conversion element 6, specifically between the reflection mirror 5 and the slit 9 to improve sensitivity in the wavelength band of visible light. It is characterized in that the light is incident on the adjusting light receiving element 15.

As described above, by using the adjusting light receiving element 15 having sensitivity in the visible light wavelength band, the optical of the fire detector 100 of the visible light beam from the adjusting light emitting element 13 reflected by the rotating mirror 3 is used. It is possible to clearly know whether the system is adjusted. Specifically, when the light receiving output of the adjusting light emitting element 15 is input to the comparator and the reference value is exceeded, an LED for adjusting the optical axis provided on the outside of the detector housing 1 is turned on to turn on the light emitting device 12. It is sufficient to notify that the optical axis and the optical axis on the detector side match.

FIG. 6 is a block diagram of an embodiment showing the third embodiment of the present invention. In this embodiment, the incident angle of the visible light beam from the light emitting device 12 on the rotating mirror 3 on the detector side is shown. In order to confirm that the light emitting device 12 is at a right angle, a light receiving device 16 for adjustment and a slit 17 are provided. That is, the visible light beam from the adjusting light emitting element 13 is incident on the adjusting light receiving element 16 also provided on the light emitting device 12 side depending on the rotation position of the rotating mirror 3. Of course, the adjustment light receiving element 16 has sensitivity in the wavelength band of the visible light beam.

Adjustment light emitting element 13 and adjustment light receiving element 16
A slit 17 is shown in the front of FIG. That is, the visible light beam from the adjusting light-emitting element 13 is narrowed by the opening of the slit 17 and enters the rotating mirror 3, and when the rotating mirror 3 rotates to a specific position, the reflected visible light beam is opened by the slit 17. The light is incident on the adjustment light receiving elements 16 that are aligned in a straight line through the section.

At this time, if the optical axis of the adjusting light emitting element 13 is perpendicular to the rotating axis of the rotating mirror 3, the reflected visible light beam is incident on the adjusting light receiving element 16 through the slit 17, whereby the light emitting device is emitted. It can be confirmed that the optical axis of the optical system 12 and the optical axis of the optical system of the fire detector 100 side are aligned on a straight line when viewed from above. Adjustment light receiving element 16
Following the light reception output of, the optical axis adjustment state provided outside the light emitting device 12 is shown when the light reception output exceeds the reference value by being input to the comparator, as in the case of the second embodiment of FIG. The LED may be turned on.

In the above embodiment, the light emitting device 1
Although the case where 2 is detachably provided to the fire detector 100 has been taken as an example, it goes without saying that the light emitting device 12 may be fixedly provided to the fire detector 100 from the beginning.

[0036]

As described above, according to the present invention, it is possible to visually confirm from the bright line by the irradiation of the visible light beam where the fire detector is currently scanning the warning area. The alignment of the detector with respect to the reference position in the guard area can be performed with high accuracy and easily.

Further, since the alignment of the light emitting device which emits the visible light beam provided in the fire detector can be confirmed by catching the visible light beam from the light emitting device with the light receiving element for adjustment, it can be adjusted easily with high accuracy. By adjusting the optical system of the light emitting device and the optical system of the fire detector, the installation position can be adjusted with higher accuracy.

[Brief description of drawings]

FIG. 1 is a configuration diagram of an embodiment showing a first embodiment of the present invention.

FIG. 2 is an explanatory diagram showing a vertical scanning range at the time of installation of the present invention.

FIG. 3 is an explanatory view showing the adjustment state of the installation position of the present invention.

FIG. 4 is an explanatory view showing a bright line by a visible light beam when FIG. 3 is seen in a plan view.

FIG. 5 is a configuration diagram of an embodiment showing a second embodiment of the present invention.

FIG. 6 is a configuration diagram of an embodiment showing a third embodiment of the present invention.

7 is an explanatory view of a slit used in the embodiment of FIG.

FIG. 8 is a schematic explanatory diagram of a conventional two-dimensional scanning fire detector.

FIG. 9 is an explanatory diagram of data viewed from a detector used for setting a warning area.

FIG. 10 is an explanatory diagram of a conventional adjustment method using a sighting scope device.

11 is an explanatory view of a scope surface of the sighting scope device of FIG.

[Explanation of symbols]

1: Detector housing 2: Motor 3: Rotating mirror 4: Monitoring area 5: Reflection mirror 6: photoelectric conversion element 7: Detection window 8: Condensing lens 9, 17: Slit 10: Relay lens 12: Light emitting device 13: Light emitting device for adjustment (semiconductor laser) 14: Beam splitter 15, 16: Light receiving element for adjustment 20: Base 21: rotating shaft 22: Support stand 23: axis

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Kazumasa Shimizu             75-1 Hasunumacho, Itabashi-ku, Tokyo             In Pucon (72) Inventor Toshiaki Yoshizaki             75-1 Hasunumacho, Itabashi-ku, Tokyo             In Pucon

Claims (5)

[Claims] 1. A two-dimensional scanning fire detector which scans a surveillance area through a detection window with a rotating mirror and judges the presence or absence of a fire from a detection signal of radiant energy from the surveillance area obtained by the scanning. A light emitting device that emits highly linear visible light is provided in front of the detection window, and the visible light beam from the light emitting device is reflected by the rotating mirror to irradiate the monitoring area with the bright line of the visible light beam. A two-dimensional scanning fire detector characterized in that 2. The two-dimensional scanning fire detector according to claim 1, wherein a photoelectric conversion element for photoelectrically converting radiant energy from the monitored area obtains a visible light beam receiving output from the light emitting device. Thus, the two-dimensional scanning type fire detector, wherein the light emitting device is attached to the detector housing. 3. The two-dimensional scanning fire detector according to claim 1, wherein a beam splitter is provided in the middle of the optical path surface from the rotating mirror to the photoelectric conversion element for photoelectrically converting the radiant energy from the monitored area and visible. The light emitting device is attached to a detector housing so that a visible light beam is incident on an adjusting light receiving element having sensitivity in the wavelength band of light, and a visible light beam receiving output is obtained from the adjusting light receiving element. Characterized by 2
Dimensional scanning fire detector. 4. The two-dimensional scanning fire detector according to claim 1, wherein the light emitting device includes a light emitting device for adjustment for emitting a visible light beam, and a reflected light of the visible light beam by the rotating mirror. An adjusting light receiving element for receiving light is provided, and one slit is arranged in front of the adjusting light emitting element and the adjusting light receiving element, and the visible light beam reflected by the rotating mirror from the adjusting light receiving element receives output light. As described above, a two-dimensional scanning fire detector in which the light emitting device is attached to a detector housing. 5. A light emitting device that emits highly linear visible light is provided in front of the detection window, and the visible light beam from the light emitting device is reflected by a rotating mirror to irradiate the monitoring area with the bright line of the visible light beam. In the method for adjusting the installation position of the two-dimensional scanning type fire detector, at the position where the bright line of the visible light beam emitted from the two-dimensional scanning type detector passes a predetermined reference target in the warning area. A method for adjusting the installation position of a two-dimensional scanning fire detector, which comprises adjusting the horizontal scanning angle of the two-dimensional scanning fire detector to be a reference angle.