CN104458577A - Thermal infrared imager based gas remote detecting device - Google Patents
Thermal infrared imager based gas remote detecting device Download PDFInfo
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- CN104458577A CN104458577A CN201410720820.8A CN201410720820A CN104458577A CN 104458577 A CN104458577 A CN 104458577A CN 201410720820 A CN201410720820 A CN 201410720820A CN 104458577 A CN104458577 A CN 104458577A
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Abstract
The invention discloses a gas remote detecting device for detecting target gas in gas (5) to be detected. The gas remote detecting device comprises a pulse laser (1), a white focusing lens (2), a thermal infrared imager (6) and a judgment device (7), wherein the pulse laser (1) is used for generating laser, and the wave length of the laser is locked within one absorption peak range of the gas to be detected (5); the white focusing lens (2) is used for collimating the laser output by the pulse laser (1), and the collimated laser is radiated to the gas to be detected (5); the thermal infrared imager (6) is used for acquiring a thermal infrared spectrum of the gas to be detected (5); and the judgment device (7) is used for judging whether the gas to be detected (5) contains the target gas according to the thermal infrared spectrum acquired by the thermal infrared imager (6). The gas remote detecting device has a simple structure, can realize detection in a remote real-time non-contact manner, and can determine the position of the target gas.
Description
Technical field
The invention belongs to gas sensing device technical field, particularly a kind of gas remote measurement device based on thermal infrared imager.
Background technology
Gas remote measurement technology is widely used at a distance or the detection of gas of not easily place of arrival, the detection of especially poisonous inflammable gas.By existence and the location of leak of long distance positioning Leakage Gas, can quick inswept large area region to be measured, need not breaks in production, work efficiency is high.Detect in certain safe distance, avoid directly contacting poisonous inflammable gas.
Tunable diode laser absorption spectroscopy (TDLAS) technology is a kind of absorption spectroscopy techniques utilizing the tunable characteristic of semiconductor laser to carry out spectral detection, is widely used in field of gas detection.One of prior art [Chen Dong etc., gas measuring method based on tunable diode laser absorption spectroscopy is studied, optical technology, 32nd volume, 4th phase, in July, 2006] a kind of gas detect scheme based on tunable diode laser absorption spectroscopy (TDLAS) technology is proposed, adopt tunable IR distributed feed-back (DFB) semiconductor laser as light source, apply wavelength-modulated and second-harmonic detection technology, carry out Signal transmissions by optical fiber.But the transmitted light that the program is collected owing to adopting photodetector to detect GRIN Lens, photodetector is connected with signal processing unit, and system is closed type structure, can not be used for long-range detection, and can not inswept large area region to be measured.
Optoacoustic spectroscopy is the gas detection technology based on photo-thermal effect and thermoacoustic effect, and it comprises the conversion process of energy of light, heat, sound, electricity.Prior art two [Chen Weigen etc., based on the CO gas optoacoustic spectroscopy examine repair of distributed feedback semiconductor laser, Proceedings of the CSEE, 32nd volume, 13rd phase, in May, 2012] a kind of gas detect scheme based on optoacoustic spectroscopy Cleaning Principle is proposed, analyze the relation of photoacoustic signal and laser power, gas concentration.Gas to be measured produces optoacoustic effect in optoacoustic cell cavity, can not be used for the gas remote measurement of open space.
Thermal infrared imager receives the infrared energy of object under test and is reflected on the light activated element of infrared eye by its distribution pattern, thus obtaining the Infrared Thermogram corresponding with the heat distribution field of object, on thermography, different colours represents the different temperature of testee.The detection range of thermal infrared imager, up to 2000 meters, is applicable to poisonous inflammable gas and detects.At present, thermal infrared imager is used to the detection of multiple gases, as benzene, ethanol, methane etc., but all utilize measured matter to leak the temperature difference of front and back, this temperature difference is general less, can not detect when temperature variation is below thermal infrared imager resolution, and can not determine the particular location of Leakage Gas.
Summary of the invention
(1) technical matters that will solve
In view of this, fundamental purpose of the present invention solves that existing gas remote measurement device detection range is short, range of application is restricted maybe cannot determine the shortcomings such as particular location.
(2) technical scheme
For solving the problems of the technologies described above, the present invention proposes a kind of gas remote measurement device, for detecting the object gas in gas to be measured, comprise pulsed laser, GRIN Lens, thermal infrared imager and decision maker, wherein, described pulsed laser is for generation of laser, and the wavelength locking of this laser is on an absorption peak of gas to be measured; The laser that described GRIN Lens exports for paired pulses laser instrument collimates, and the laser after collimation is irradiated to described gas to be measured; Described thermal infrared imager is for gathering the thermography of described gas to be measured; Whether the thermography that described decision maker is used for gathering according to described thermal infrared imager judges in described gas to be measured containing object gas.
According to one embodiment of the present invention, described pulsed laser is narrow linewidth laser.
According to one embodiment of the present invention, the live width of described pulsed laser is much smaller than the absorption peak width of gas to be measured, and the wavelength locking of its laser produced is on a strong absorption peak of gas to be measured.
According to one embodiment of the present invention, the length of described GRIN Lens is corresponding 1/4th intercepts of described absorption peak wavelength of described gas to be measured.
According to one embodiment of the present invention, the applicable wavelengths of described thermal infrared imager conforms to the described absorption peak corresponding wavelength of described gas to be measured.
According to one embodiment of the present invention, described decision maker, when the described gas temperature to be measured of described thermography display is higher than background image, judges that object gas exists.
According to one embodiment of the present invention, described decision maker is reported to the police when it is determined that the presence of object gas.
According to one embodiment of the present invention, described pulsed laser provides trigger pip by a synchronous generator, this trigger pip is also input to described decision maker simultaneously, described decision maker, by calculating this trigger pip the time sent and the mistiming recording the thermographic time that temperature raises, calculates the distance of described object gas apart from this gas remote measurement device.
According to one embodiment of the present invention, described pulsed laser, GRIN Lens and thermal infrared imager are all fixed on a pedestal.
According to one embodiment of the present invention, described object gas is the one in methane, carbon dioxide, ethanol, acetylene, ammonia.
(3) beneficial effect
The first, gas remote measurement device of the present invention, application thermal infrared imager detects temperature difference that photo-thermal effect produces thus determines the presence or absence of object gas, can realize non-contact detecting.
The second, gas remote measurement device suitable gas kind of the present invention is many, and pulsed laser and thermal infrared imager by selecting respective wavelength realize the detection of multiple gases.
3rd, gas remote measurement device of the present invention does not need to detect transmitted light, and light path is simple, does not need reflecting object, and therefore detecting distance is far away, can reach 2000 meters, can determine object gas position;
4th, the gas remote measurement device response time of the present invention is short, can detect in quick inswept large area region to be measured, can realize testing result real-time Transmission and warning simultaneously;
5th, the change of gas remote measurement device detected temperatures of the present invention, do not need to use photodetector to carry out opto-electronic conversion, do not need electric signal processing unit, structure is simple.
Accompanying drawing explanation
For further illustrating technology contents of the present invention, below in conjunction with accompanying drawing, the invention will be further described, wherein:
Fig. 1 is photo-thermal effect schematic diagram;
Fig. 2 is the structural representation of gas remote measurement device of the present invention;
Fig. 3 is the beam collimation index path of the GRIN Lens in gas remote measurement device of the present invention;
Fig. 4 is the structural representation of the gas remote measurement device of one embodiment of the present of invention.
Embodiment
Details are as follows for gas remote measurement device principle of work of the present invention.Fig. 1 is photo-thermal effect schematic diagram, as shown in Figure 1, time in gas to be measured containing object gas composition, according to Beer law:
I
t＝I
0exp[-α(v)CL]，
In formula, I
tfor transmitted light intensity, I
0for incident intensity, the absorption coefficient that α (v) is absorption line, C is object gas volume fraction, and L is light path.Be lorentzian curve under α (v) normal temperature and pressure,
In formula, N is target gas molecules number, and S is absorption line strengths, γ
lfor half high half-breadth of lorentzian curve.S, γ
lvalue is the parameter of absorption line, can be obtained by Hitran database.
α CL < < 1, approximate have I
t≈ I
0(1-α CL), therefore absorbed light intensity is
I＝I
0-I
t＝I
0αCL，
Gas absorption laser energy energy of vibration increases, and by radiationless transition, the energy of vibration of increase is all converted into translational kinetic energy, and steam, ammonia, acetylene are very fast, and at tens nanosecond orders, carbon dioxide, nitrogen monoxide are comparatively slow, at hundreds of musec order.The rising of gas temperature can represent with the increase of average translational kinetic energy, and the heat energy that system increases is
k is Boltzmann constant, and Δ T is the temperature variation of gas to be measured.The detection to object gas is realized by the temperature variation Δ T detecting gas 5 to be measured.
Following formula is used for determining the position of object gas,
l＝c·Δt，
L is the distance of object gas distance telemetering device, and c is the light velocity in air, and Δ t is the mistiming that trigger pip is issued to that thermography collects temperature difference.
For making the object, technical solutions and advantages of the present invention clearly understand, below in conjunction with specific embodiment, the present invention is described in further detail.
Fig. 2 is the structural representation of the gas remote measurement device based on thermal infrared imager according to the embodiment of the present invention, refer to shown in Fig. 2, this gas remote measurement device is for detecting the object gas in gas 5 to be measured, and this gas to be measured can be separated by an open space 4 with this gas remote measurement device.This gas remote measurement device comprises pulsed laser 1, GRIN Lens 2, thermal infrared imager 6 and decision maker 7.
Pulsed laser 1 is for generation of laser, and the wavelength locking of the laser produced is on an absorption peak of gas 5 to be measured.Preferably, described pulsed laser 1 is narrow linewidth laser, and its live width should be far smaller than the absorption peak width of gas 5 to be measured, and the wavelength locking of its laser produced is on a strong absorption peak of gas 5 to be measured.
The laser that GRIN Lens 2 exports for paired pulses laser instrument 1 collimates, and the laser after collimation is irradiated to gas 5 to be measured through open space 4.
Fig. 3 is the beam collimation index path of GRIN Lens of the present invention, and as shown in Figure 3, described GRIN Lens 2 is positioned at the Laser emission end of pulsed laser 1, and its length is corresponding 1/4th intercepts of gas 5 absorption peak wavelength to be measured.It is for collimated light beam, and outgoing laser beam divergence is diminished, and directivity is better.Light beam shape in GRIN Lens is sine function, and during corresponding 1/4th intercept of Selective absorber spike length, GRIN Lens plays collimating effect.
Thermal infrared imager 6 is for gathering the thermography of gas 5 to be measured.The applicable wavelengths of described thermal infrared imager 6 conforms to the absorption peak corresponding wavelength of gas 5 to be measured, can change detecting distance and detection resolution by changing camera lens.
Whether described decision maker 7 judges in described gas to be measured 5 containing object gas for the thermography gathered according to described thermal infrared imager 6.According to the present invention, when containing object gas in gas 5 to be measured, described thermography shows gas 5 temperature to be measured higher than background image.Decision maker judges that object gas exists thus.When judging that object gas exists, decision maker can carry out relevant treatment, such as, report to the police.
Preferably, described pulsed laser 1 provides trigger pip by a synchronous generator 9.This trigger pip is also input to decision maker 7 simultaneously.Thus, decision maker 7, by calculating this trigger pip the time sent and the mistiming recording the thermographic time that temperature raises, can calculate the distance of object gas apart from this gas remote measurement device.
Preferably, pulsed laser 1, GRIN Lens 2, thermal infrared imager 6 are all fixed on a pedestal 3, keep stable to make whole device when detecting.
Fig. 4 is the structural representation of the gas remote measurement device based on thermal infrared imager of one embodiment of the present of invention, as shown in Figure 4, this gas remote measurement device comprises pulsed laser 1, GRIN Lens 2, pedestal 3, thermal infrared imager 6, decision maker 7, driving circuit 8 and signal generator 9.Wherein: pulsed laser 1, GRIN Lens 2, thermal infrared imager 6, driving circuit 8 are all fixed on pedestal 3; Driving circuit 8 and signal generator 9 provide power supply and the trigger pip of pulsed laser 1 respectively, and the output wavelength of pulsed laser 1 is locked on the stronger absorption peak of of gas 5 to be measured; The output light of pulsed laser 1 is collimated by GRIN Lens 2, is irradiated to gas 5 to be measured through open space 4; Thermal infrared imager 6 gathers the thermography of gas 5 to be measured, is connected with computer 7, when in gas 5 to be measured containing object gas time, when the temperature of laser postradiation thermography display is higher than background image time unglazed, system judges that object gas exists and reports to the police.Synchronous generator 9 and thermal infrared imager 6, sent and the distance recording thermographic mistiming that temperature raises and calculate object gas distance telemetering device by trigger pip.
Described pedestal 3, for fixed pulse laser instrument 1, GRIN Lens 2, thermal infrared imager 6, driving circuit 8.Wherein, the relative position of fixed pulse laser instrument 1, GRIN Lens 2, thermal infrared imager 6 is determined by concrete light path characteristic, and laser-irradiated domain and thermal infrared imager surveyed area are gas 5 region to be measured.
Described open space 4, its length is telemeter distance, and maximum detection range can reach 2000 meters.
Described gas to be measured 5 is detected objects of the present invention, by selecting the pulsed laser 1 of different wave length, can realize the detection of gas with various, as methane, carbon dioxide, ethanol, acetylene, ammonia etc.
Described decision maker 7 can be a computer, for gathering Infrared Thermogram and synchronous generator 9 and thermal infrared imager 6.When containing object gas in gas 5 to be measured, when the temperature of the postradiation thermography display of laser is higher than background image, system judges that object gas exists and reports to the police.Synchronous generator 9 and thermal infrared imager 6, sent and the distance recording thermographic mistiming that temperature raises and calculate object gas distance telemetering device by trigger pip.
Described driving circuit 8 and signal generator 9, the power supply providing pulsed laser 1 normally to work and trigger pip.
Gas remote measurement device based on thermal infrared imager provided by the invention, there is following advantage: first, achieve a kind of gas remote measurement device, application thermal infrared imager detects temperature difference that photo-thermal effect produces thus determines the presence or absence of object gas, can realize non-contact detecting; The second, this device suitable gas kind is many, and pulsed laser and thermal infrared imager by selecting respective wavelength realize the detection of multiple gases; 3rd, this device does not need to detect transmitted light, and light path is simple, does not need reflecting object, and therefore detecting distance is far away, can reach 2000 meters, can determine object gas position; 4th, this device response time is short, can detect in quick inswept large area region to be measured, can realize testing result real-time Transmission and warning simultaneously; 5th, the change of this device detected temperatures, do not need to use photodetector to carry out opto-electronic conversion, do not need electric signal processing unit, structure is simple.
Above-described specific embodiment; object of the present invention, technical scheme and beneficial effect are further described; be understood that; the foregoing is only specific embodiments of the invention; be not limited to the present invention; within the spirit and principles in the present invention all, any amendment made, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1. a gas remote measurement device, for detecting the object gas in gas to be measured (5), it is characterized in that, comprising pulsed laser (1), GRIN Lens (2), thermal infrared imager (6) and decision maker (7), wherein
Described pulsed laser (1) is for generation of laser, and the wavelength locking of this laser is on an absorption peak of gas to be measured (5);
The laser that described GRIN Lens (2) exports for paired pulses laser instrument (1) collimates, and the laser after collimation is irradiated to described gas to be measured (5);
Described thermal infrared imager (6) is for gathering the thermography of described gas to be measured (5);
Whether described decision maker (7) judges in described gas to be measured (5) containing object gas for the thermography gathered according to described thermal infrared imager (6).
2. gas remote measurement device as claimed in claim 1, it is characterized in that, described pulsed laser (1) is narrow linewidth laser.
3. gas remote measurement device as claimed in claim 2, it is characterized in that, the live width of described pulsed laser (1) is much smaller than the absorption peak width of gas to be measured (5), and the wavelength locking of its laser produced is on a strong absorption peak of gas to be measured (5).
4. gas remote measurement device as claimed in claim 1, it is characterized in that, the length of described GRIN Lens (2) is corresponding 1/4th intercepts of described absorption peak wavelength of described gas to be measured (5).
5. gas remote measurement device as claimed in claim 1, it is characterized in that, the applicable wavelengths of described thermal infrared imager (6) conforms to the described absorption peak corresponding wavelength of described gas to be measured (5).
6. gas remote measurement device as claimed in claim 1, is characterized in that, described decision maker (7), when described gas to be measured (5) temperature of described thermography display is higher than background image, judges that object gas exists.
7. gas remote measurement device as claimed in claim 6, it is characterized in that, described decision maker (7) is reported to the police when it is determined that the presence of object gas.
8. gas remote measurement device as claimed in claim 1, it is characterized in that, described pulsed laser (1) provides trigger pip by a synchronous generator (9), this trigger pip is also input to described decision maker (7) simultaneously, described decision maker (7), by calculating this trigger pip the time sent and the mistiming recording the thermographic time that temperature raises, calculates the distance of described object gas apart from this gas remote measurement device.
9. gas remote measurement device as claimed in claim 1, it is characterized in that, described pulsed laser (1), GRIN Lens (2) and thermal infrared imager (6) are all fixed on a pedestal (3).
10. gas remote measurement device as claimed in any one of claims 1-9 wherein, it is characterized in that, described object gas is the one in methane, carbon dioxide, ethanol, acetylene, ammonia.
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Cited By (3)
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| CN111272801A (en) * | 2020-04-01 | 2020-06-12 | 西安近代化学研究所 | Methane leakage infrared detection system and detection method thereof |
| CN113758898A (en) * | 2020-06-05 | 2021-12-07 | 清华大学 | Drunk driving detection method and system |
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Application publication date: 20150325 |