WO2014152194A1 - Sonde optique contenant des capteurs d'oxygène, de température et de pression et systèmes de surveillance et de contrôle contenant cette sonde - Google Patents

Sonde optique contenant des capteurs d'oxygène, de température et de pression et systèmes de surveillance et de contrôle contenant cette sonde Download PDF

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Publication number
WO2014152194A1
WO2014152194A1 PCT/US2014/027057 US2014027057W WO2014152194A1 WO 2014152194 A1 WO2014152194 A1 WO 2014152194A1 US 2014027057 W US2014027057 W US 2014027057W WO 2014152194 A1 WO2014152194 A1 WO 2014152194A1
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WIPO (PCT)
Prior art keywords
oxygen
space
temperature
housing
pressure
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Ceased
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PCT/US2014/027057
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English (en)
Inventor
Kenneth Susko
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Individual
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Individual
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Publication date
Priority claimed from US13/837,286 external-priority patent/US9298193B2/en
Application filed by Individual filed Critical Individual
Priority to EP14724846.2A priority Critical patent/EP2972116A1/fr
Publication of WO2014152194A1 publication Critical patent/WO2014152194A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • A—HUMAN NECESSITIES
    • A62—LIFE-SAVING; FIRE-FIGHTING
    • A62C—FIRE-FIGHTING
    • A62C3/00—Fire prevention, containment or extinguishing specially adapted for particular objects or places
    • A62C3/07—Fire prevention, containment or extinguishing specially adapted for particular objects or places in vehicles, e.g. in road vehicles
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
    • G01D11/00—Component parts of measuring arrangements not specially adapted for a specific variable
    • G01D11/24—Housings ; Casings for instruments
    • G01D11/245—Housings for sensors
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
    • G01K11/00—Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00
    • G01K11/32—Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00 using changes in transmittance, scattering or luminescence in optical fibres
    • G01K11/3206—Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00 using changes in transmittance, scattering or luminescence in optical fibres at discrete locations in the fibre, e.g. using Bragg scattering
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
    • G01L11/00—Measuring steady or quasi-steady pressure of a fluid or a fluent solid material by means not provided for in group G01L7/00 or G01L9/00
    • G01L11/02—Measuring steady or quasi-steady pressure of a fluid or a fluent solid material by means not provided for in group G01L7/00 or G01L9/00 by optical means
    • G01L11/025—Measuring steady or quasi-steady pressure of a fluid or a fluent solid material by means not provided for in group G01L7/00 or G01L9/00 by optical means using a pressure-sensitive optical fibre
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
    • G01L19/00—Details of, or accessories for, apparatus for measuring steady or quasi-steady pressure of a fluent medium insofar as such details or accessories are not special to particular types of pressure gauges
    • G01L19/0092—Pressure sensor associated with other sensors, e.g. for measuring acceleration or temperature
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/75—Systems in which material is subjected to a chemical reaction, the progress or the result of the reaction being investigated
    • G01N21/77—Systems in which material is subjected to a chemical reaction, the progress or the result of the reaction being investigated by observing the effect on a chemical indicator
    • G01N21/7703—Systems in which material is subjected to a chemical reaction, the progress or the result of the reaction being investigated by observing the effect on a chemical indicator using reagent-clad optical fibres or optical waveguides
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/84—Systems specially adapted for particular applications
    • G01N21/85—Investigating moving fluids or granular solids
    • G01N21/8507—Probe photometers, i.e. with optical measuring part dipped into fluid sample
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
    • G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
    • G01D5/26—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light
    • G01D5/32—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light
    • G01D5/34—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells
    • G01D5/353—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells influencing the transmission properties of an optical fibre
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
    • G01N21/41—Refractivity; Phase-affecting properties, e.g. optical path length
    • G01N21/45—Refractivity; Phase-affecting properties, e.g. optical path length using interferometric methods; using Schlieren methods
    • G01N2021/458—Refractivity; Phase-affecting properties, e.g. optical path length using interferometric methods; using Schlieren methods using interferential sensor, e.g. sensor fibre, possibly on optical waveguide
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/62—Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light
    • G01N21/63—Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light optically excited
    • G01N21/64—Fluorescence; Phosphorescence
    • G01N21/6428—Measuring fluorescence of fluorescent products of reactions or of fluorochrome labelled reactive substances, e.g. measuring quenching effects, using measuring "optrodes"
    • G01N2021/6432—Quenching
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/75—Systems in which material is subjected to a chemical reaction, the progress or the result of the reaction being investigated
    • G01N21/77—Systems in which material is subjected to a chemical reaction, the progress or the result of the reaction being investigated by observing the effect on a chemical indicator
    • G01N21/7703—Systems in which material is subjected to a chemical reaction, the progress or the result of the reaction being investigated by observing the effect on a chemical indicator using reagent-clad optical fibres or optical waveguides
    • G01N2021/7706—Reagent provision
    • G01N2021/772—Tip coated light guide
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/75—Systems in which material is subjected to a chemical reaction, the progress or the result of the reaction being investigated
    • G01N21/77—Systems in which material is subjected to a chemical reaction, the progress or the result of the reaction being investigated by observing the effect on a chemical indicator
    • G01N2021/7769—Measurement method of reaction-produced change in sensor
    • G01N2021/7786—Fluorescence

Definitions

  • an optical probe containing integrated oxygen, temperature, and pressure sensors.
  • the probe is particularly suitable for determining the concentration of oxygen, particularly the partial pressure of oxygen, in an enclosed space, such as a fuel tank, cargo hold, passenger compartment, or other space in a vehicle, such as an aircraft, ship, boat, land vehicle, or other military, commercial, or aerospace vessel.
  • One method which reduces fuel/vapor combustion includes the elimination of combustible gases from the fuel tank. This method fills space within a fuel tank with an inert gas. The presence of the inert gas within the fuel tank deprives the fuel/vapor mixture of a flammable gas necessary for combustion. Nonetheless, the need to continuously fill the fuel tank with an inert gas and the attendant high costs associated therewith do not make this an attractive alternative for aircraft manufacturers.
  • a more efficient method in accordance with the prior art includes flooding the tank with inert gas when oxygen levels become high.
  • This method requires continually measuring oxygen levels in a fuel tank.
  • either the temperature level of the oxygen sensor must be kept constant, or the temperature of the sensor must be measured in real time and taken into account in calculating the oxygen partial pressure from the sensor signal. Similar concerns arise with regard to the pressure in the vicinity of the oxygen sensor.
  • temperatures and pressures within an enclosed space such as fuel tanks in vehicles, can fluctuate over time depending on the outside temperature.
  • spatial fluctuations in temperature and pressure within the fuel tank can occur.
  • these fluctuations can impact the ability of the monitoring and control electronics to accurately determine the oxygen level from the data obtained from the oxygen sensor.
  • Such a system provides pressure information that is representative of the pressure in the fuel tank, but is based on the pressure outside of the aircraft.
  • a pressure sensor system built into the fuel tank at a fixed position can provide erroneous information when the aircraft is not level.
  • the pressure measurement from such systems is not accurate information about the ullage pressure in the vicinity of the probe, where the oxygen level is actually being measured.
  • some vehicles such as commercial and military aircraft, contain areas, such as cargo holds, passenger compartments, and the like, that may, expectedly or unexpectedly, contain materials capable of supporting combustion.
  • Such areas can be equipped with fire suppression systems, which often are manually operated from the flight deck when an indication of a fire is received, generally from an increase in temperature in the cargo hold.
  • fire suppression systems which often are manually operated from the flight deck when an indication of a fire is received, generally from an increase in temperature in the cargo hold.
  • temperature in the cargo hold may remain elevated for a considerable period of time.
  • Fire suppression in passenger compartments provides a particular challenge, requiring precise control of the type and amount of fire suppression gas introduced, so as to decrease oxygen available for combustion while maintaining sufficient oxygen for life support of the passengers. Accurate monitoring of oxygen concentration in such a space is essential.
  • OBIGGS On Board Inert Gas Generating System
  • This system processes pressurized air through hollow fiber membranes to obtain a nitrogen enriched air, which can be used as an inerting gas.
  • OBIGGS equipped aircraft with the system constantly operational (i.e., continuously supplying nitrogen to the ullage of the aircraft fuel tanks). Such an operation, however, incurs a significant fuel penalty.
  • a sensing/control system that allows an inerting system such as OBIGGS to be operated when necessary (i.e., when the oxygen partial pressure in the ullage of the fuel tank reaches a predetermined value) and to be idled when operation is not necessary, thereby increasing fuel economy.
  • Such an idled mode includes heating of the system to prevent freezing of moisture in the system.
  • a probe that provides accurate, localized information about oxygen concentration, pressure, and temperature, and that is capable of operating under the stringent environmental conditions found in, e.g., an aviation fuel tank. These conditions include operation under widely varying temperatures, operation under low temperatures, operation while exposed to the components of fuels, and particularly while exposed to the hydrocarbons in various aviation fuels, such as jet fuels, and operation under vibration.
  • a probe for measuring oxygen, temperature, and pressure in a space to be monitored comprising:
  • a housing comprising a thermally conductive material
  • an oxygen sensor disposed within the housing comprising:
  • a first end having coated thereon a coating which fluoresces at a fluorescent frequency when exposed to light having an excitation frequency in the absence of associated oxygen, and which undergoes a dampening of said fluorescence in the presence of associated oxygen;
  • first end extends through the housing and is adapted to be exposed to the space to be monitored
  • a temperature sensor disposed within the housing adjacent to the thermally conductive material, wherein the temperature sensor does not extend through the housing and is not exposed to the space to be monitored;
  • a pressure sensor disposed within the housing, having a first end which extends through the housing and is adapted to be exposed to the space to be monitored.
  • the temperature sensor may include a fiber Bragg grating or a semiconductor crystal, such as a gallium arsenide crystal.
  • the pressure sensor may include a fiber Bragg grating or a Fabry-Perot white light interferometry sensor. The temperature sensor and pressure sensor may be integrated into a single sensor disposed within the probe tip.
  • a system for monitoring the level of oxygen in a space to be monitored comprising:
  • an analyzer for calculating oxygen partial pressure based upon the fluorescence damping, temperature, and pressure data provided by the probe.
  • a system for controlling the concentration of oxygen in a space comprising:
  • the system for monitoring the level of oxygen in the space as described herein; and a controller for introducing an inert gas into the space when the level of oxygen in the space reaches a predetermined level.
  • a vehicle comprising the system for controlling the concentration of oxygen in a space as disclosed herein.
  • a method for monitoring the level of oxygen in a space equipped with a probe as described herein comprising:
  • a method for controlling the level of oxygen in a space comprising:
  • each of the sensors is located at the probe tip, data on oxygen concentration, temperature, and pressure are obtained at that location, providing a more accurate, real time, in situ determination and calculation of oxygen concentration, and therefore better monitoring and control of the level of oxygen in the space being monitored. Moreover, because no sample removal is required and data acquisition occurs within the space being monitored, accuracy is also increased.
  • embodiments of the probe and system described herein provide a sensor dynamic range of oxygen concentration ranging from 0% (total inertness) to 25% (in excess of air), with a resolution of 0.1% and an accuracy of 0.5% 0 2 , and a sensor response time of a few seconds.
  • Embodiments of the probe described herein can be multiplexed to a single control unit, allowing multiple locations in a space to be monitored simultaneously.
  • Embodiments of the probe described herein are resistant to hydrocarbon exposure, resistant to the effects of thermal shock and pressure changes experience, e.g., during flight.
  • embodiments of the probe and system described herein can operate over a temperature range of -50 to +80 °C, and over a pressure range of ambient to +2 psi.
  • the probe described herein allows the vehicle operator to confirm that inerting or fire suppression is occurring as needed and according to specifications, to determine the inertness of the space being monitored, and allows for a closed loop control of oxygen levels in the space being monitored. Moreover, the system is small, light weight, and compatible with automatic control systems onboard the vehicle.
  • FIG. 1 is a schematic view of an integrated oxygen probe having oxygen, temperature, and pressure sensors according to an embodiment disclosed herein.
  • FIG. 2 is a perspective view of an embodiment of an oxygen probe tip suitable for use in the oxygen sensor of FIG. 1
  • FIG. 3A is a front plan view of the oxygen probe tip of FIG. 2.
  • FIG. 3B is a sectional view along section line A-A of FIG. 3 A.
  • FIG. 4 is a perspective view of another embodiment of an oxygen probe tip, wherein the temperature sensor and pressure sensor have been integrated together within the probe tip.
  • FIG. 5 is a partial cutaway view of an embodiment of an integrated temperature/pressure sensor.
  • DETAILED DESCRIPTION OF SPECIFIC EMBODIMENTS As used herein, the term "about” in connection with a numerical value or range of numerical values denotes somewhat above and somewhat below the stated numerical value, to a maximum deviation of ⁇ 10%.
  • FIG. 1 A particular embodiment of an integrated oxygen, temperature, and pressure probe is shown schematically in FIG. 1.
  • Probe tip 1 is disposed at one end of probe tube 3.
  • probe cover 2 At the other end of probe tube 3 is disposed probe cover 2, adjacent to heat shrink tube 10.
  • the probe tip 1 contains an oxygen sensor, a temperature sensor, and a pressure sensor, all connected to optical fibers (4, 5, and 6) (e.g., 1000-1 100 micron fiber is generally suitable, however other fiber sizes can be used) enclosed within a polymeric tube (e.g., PTFE tube).
  • each optical fiber is connected to an optical connector (8A, 8B, and 8C) suitable for connection to an optoelectronic monitoring and/or control system (not shown).
  • FIG. 1 A particular embodiment of an integrated oxygen, temperature, and pressure probe is shown schematically in FIG. 1.
  • R representing a radius of curvature of the probe
  • R may generally be greater than or equal to 0, more particularly greater than or equal to 1.3 inches, and is dependent to some degree on the properties and thickness of the optical fibers used in the probe. In some applications, no curvature in the probe will be necessary or desirable, so that there will be no radius of curvature.
  • angle ⁇ will also depend upon the thickness and properties of the fiber, and may range from 0° to 75°, more particularly from 0° to 60°, even more particularly from 0° to 45°.
  • the length L can also be substantially variable, but is generally greater than or equal to 3 inches, more particularly greater than or equal to 5 inches. Factors that may influence the various dimensions and geometry of the system include the particular platform in which the system is installed, the particular mounting used, clearances in the vicinity of the mounting, etc.
  • FIG. 2 is a perspective view of an embodiment of probe tip 1 , showing distal end 102, which is adapted to connect to one end of probe tube 3, and proximal end 104, which is exposed to the environment of the space to be monitored.
  • proximal end 104 contains a flat portion 106 and a beveled portion 108, although this geometry is exemplary and other geometries are possible.
  • Flat portion 106 contains pressure sensor 1 10 and temperature sensor 1 16 (shown as a dotted line in FIG. 2).
  • the proximal end of pressure sensor 1 10 is, in this embodiment, exposed to the environment of the space to be monitored, while temperature sensor 1 16 is separated from the environment of the space to be monitored by a thin layer of thermally conductive material, desirably the metal forming the flat portion 106 of the probe tip 1.
  • Beveled portion 108 contains oxygen sensor 1 12, the proximal end of which is also exposed to the environment of the space to be monitored.
  • probe tip body 114 which, like distal end 102 is desirably hollow, allowing sufficient space for the fibers connected to pressure sensor 1 10, temperature sensor 1 16 and oxygen sensor 1 12 to pass through the probe tip 1 to the probe tube 3, and to provide sufficient rigidity.
  • the probe tube 3 can desirably be filled with vibration dampening material, such as silicone, indicated by 3a in FIG. 1 , to restrict fiber movement and/or dampen vibrations experienced by the system during operation.
  • FIG. 3 A is a front plan view of proximal end 104 of probe tip 1 , showing the arrangement of flat portion 106 and beveled portion 108, as well as the arrangement of pressure sensor 1 10, temperature sensor 1 16 (shown in dotted line) and oxygen sensor 1 12.
  • FIG. 3B is a sectional view along section line A-A in FIG. 3 A. Temperature sensor 1 16 is visible in this view, and is separated from the environment to be monitored by a thin piece of thermally conductive material 1 18.
  • the angle of bevel can be substantially variable, but generally ranges from about 30° to about 60°, more particularly about 45°.
  • FIG. 4 is a perspective view of another embodiment of a probe tip where the temperature sensor has been integrated with the pressure sensor within the probe tip, the integrated pressure/temperature sensor being indicated by reference numeral 410.
  • integrated pressure and temperature sensors are available from FISO Technologies Inc., Quebec, Canada, and may take the form of a gallium arsenide temperature sensor, disposed behind a Fabry-Perot white light interferometry sensor for measuring pressure. The pressure sensor is exposed to conditions in the space to be measured, while the temperature sensor, which is immediately behind the pressure sensor, is not. Each sensor retains its own optical fiber for transmission of information.
  • the gallium arsenide material senses temperature as the result of the variance in white light absorption and transmission with varying temperature.
  • Fabry-Perot white light interferometry sensor or piezometer functions as described in Pinet, Fabry-Perot Fiber-Optic Sensors for Physical Parameters Measurement in Challenging Conditions, Journal of Sensors, 2009, 720980, incorporated herein by reference.
  • a reflecting deformable membrane is assembled over a generally vacuumed cavity made in a transparent material, thus forming a small drum.
  • the bottom of the cavity and the inner flat surface of the flexible membrane are forming the sensing Fabry-Perot cavity.
  • the membrane deflects, thus changing the Fabry-Perot cavity length.
  • each cavity length corresponds to a pressure value that is displayed.
  • FIG. 5 is a partial cutaway view of an embodiment of an integrated pressure/temperature sensor 502 suitable for use in the probe tip disclosed herein.
  • pressure sensor 504 which may be a Fabry-Perot white light interferometry sensor or piezometer, and which is connected to an optical fiber 506.
  • temperature sensor 508 Disposed within the housing 512 operatively behind pressure sensor 504 is a temperature sensor 508, which is connected to another optical fiber 510.
  • Temperature sensor 508 may be another Fabry-Perot white light interferometry sensor or may be a gallium arsenide material.
  • Optical fibers 506 and 510 can be combined to form optical cable 514, or can be maintained as separate optical fibers, which can be connected to the desired processing electronics.
  • the oxygen sensor may desirably be of the fluorescence damping type described in U.S. Patent Nos. 6,634,598; 6,904,930; 6,925,852; 7,231,809, 7,740,904, and in U.S. Patent Application Publication Nos. 2008/0199360 and 2009/0028756, the entire contents of each of which are incorporated herein by reference.
  • the temperature sensor may be of a fiber Bragg type, wherein the Bragg wavelength is sensitive to temperature. Without wishing to be bound by theory, it is believed that a change in temperature in the space being monitored results in a shift in the Bragg wavelength ⁇ / ⁇ , according to a relationship of the form:
  • the pressure sensor may also be of a fiber Bragg type, wherein the tip of the fiber Bragg grating is directly exposed to the space to be monitored.
  • the resulting shift in Bragg wavelength will be the result of the contribution of the strain experienced by the pressure sensor as the result of the change in pressure, and of the contribution from the change in temperature. Since the temperature contribution is known from the temperature sensor, the strain contribution can be determined via a suitable algorithm, and the resulting pressure change determined.
  • Suitable fiber Bragg grating transceiver systems suitable for use with the fiber Bragg grating temperature and pressure sensors described above include those available from Redondo Optics, Inc. (FBG-TransceiverTM). Pressure, temperature, and oxygen level data obtained from the probe described above may be sent to an analysis system, such as a multichannel interrogation system.
  • a suitable system is the FOxSenseTM multichannel interrogation system available from Redondo Optics, Inc.
  • the data is analyzed using a suitable algorithm, such as one using the Stern- Volmer relationship, to determine the partial pressure of oxygen in the space being monitored, such as the ullage of a fuel tank, cargo hold, passenger compartment, etc.
  • This information can, in turn, be used to control and monitor an inerting system of the type described in U.S. Patent Nos. 6,634,598; 6,904,930; 6,925,852; and 7,231 ,809, an OBIGGS system, a halon fire suppression system, a nitrogen/water mist passenger compartment fire suppression system, and the like, on an aircraft, waterborne vessel, tank or armored vehicle, etc.
  • the pressure and/or temperature sensors may be of the Fabry-Perot white light interferometry type.
  • the temperature sensor may be a gallium arsenide sensor, or may be formed of another material having temperature sensitive light absorbtion and/or transmission characteristics.
  • the oxygen concentration therein is maintained at a level below about 9% by volume (for military aircraft) and below about 1 1 - 12% by volume (for commercial aircraft) at atmospheric pressure.

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Abstract

La présente invention concerne une sonde permettant de mesurer l'oxygène, la température et la pression dans un espace à surveiller, la sonde comprenant : un logement comprenant un matériau thermoconducteur ; un capteur d'oxygène disposé au sein du logement, le capteur d'oxygène comprenant : une première extrémité recouverte d'un revêtement qui fluoresce à une fréquence de fluorescence quand il est exposé à une lumière ayant une fréquence d'excitation en l'absence d'oxygène associé et qui subit un amortissement de ladite fluorescence en présence d'oxygène associé ; et une seconde extrémité connectée de manière fonctionnelle à une fibre optique qui se prolonge à travers le logement ; la première extrémité se prolongeant à travers le logement et étant conçue pour être exposée à l'espace à surveiller ; un capteur de température disposé au sein du logement à côté du matériau thermoconducteur, le capteur de température comprenant un réseau de Bragg sur fibre ou un matériau semi-conducteur, tel qu'un matériau à base de GaAS, le capteur de température ne se prolongeant pas travers le logement et n'étant pas exposé à l'espace à surveiller ; un capteur de pression disposé au sein du logement, le capteur de pression comprenant un réseau de Bragg sur fibre ou un capteur à interférométrie par lumière blanche de Fabry-Pérot possédant une première extrémité qui se prolonge à travers le logement et qui est conçu pour être exposée à l'espace à surveiller.
PCT/US2014/027057 2013-03-15 2014-03-14 Sonde optique contenant des capteurs d'oxygène, de température et de pression et systèmes de surveillance et de contrôle contenant cette sonde Ceased WO2014152194A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP14724846.2A EP2972116A1 (fr) 2013-03-15 2014-03-14 Sonde optique contenant des capteurs d'oxygène, de température et de pression et systèmes de surveillance et de contrôle contenant cette sonde

Applications Claiming Priority (2)

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EP3045894A3 (fr) * 2014-12-23 2016-08-03 Mocon, Inc. Capteur d'analyte à fibres optiques avec correction de pression totale in situ intégrée
CN106924924A (zh) * 2017-03-22 2017-07-07 江苏骏龙光电科技股份有限公司 基于分布式光纤测温的灭火联动控制系统
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CN115507883A (zh) * 2022-10-13 2022-12-23 新密市常维耐火材料有限公司 非本征光纤法布里珀罗温压传感器及其制备方法
CN115753130A (zh) * 2022-11-29 2023-03-07 中北大学 发动机进气总温总压探针及发动机进气总温总压测量系统

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11293866B2 (en) 2012-03-22 2022-04-05 John EASTMAN Fiber optic analyte sensor
EP3045894A3 (fr) * 2014-12-23 2016-08-03 Mocon, Inc. Capteur d'analyte à fibres optiques avec correction de pression totale in situ intégrée
CN105784194A (zh) * 2016-04-27 2016-07-20 珠海欧森斯科技有限公司 多点温度检测集成装置及多点温度检测系统
CN106924924A (zh) * 2017-03-22 2017-07-07 江苏骏龙光电科技股份有限公司 基于分布式光纤测温的灭火联动控制系统
CN115507883A (zh) * 2022-10-13 2022-12-23 新密市常维耐火材料有限公司 非本征光纤法布里珀罗温压传感器及其制备方法
CN115753130A (zh) * 2022-11-29 2023-03-07 中北大学 发动机进气总温总压探针及发动机进气总温总压测量系统

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