CN103411922A - Handheld gas sensing system based on optical remote measuring lens - Google Patents
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- 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
- G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
- G01N21/31—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry
- G01N21/39—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using tunable lasers
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- 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
- G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
- G01N21/31—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry
- G01N21/35—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light
- G01N21/3504—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light for analysing gases, e.g. multi-gas analysis
- G01N2021/3513—Open path with an instrumental source
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
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- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
- G01N21/31—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry
- G01N21/39—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using tunable lasers
- G01N2021/396—Type of laser source
- G01N2021/399—Diode laser
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- 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
- G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
- G01N21/31—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry
- G01N21/35—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light
- G01N21/3504—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light for analysing gases, e.g. multi-gas analysis
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- 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
- G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
- G01N21/31—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry
- G01N21/35—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light
- G01N21/359—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light using near infrared light
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Abstract
The invention provides a handheld gas sensing system based on an optical remote measuring lens, and aims to overcome the defects that the conventional gas or trace gas concentration measurement technology is high in measurement cost, technically restricted in measurement occasions and higher in requirement for measurement professionalism. The handheld gas sensing system mainly comprises a laser and a detecting unit and further comprises a data processing unit, a housing and a lens protective case. According to the invention, as the remote measuring detection technology is applied to the handheld gas detection system, the handheld gas sensing system has the following advantages: the remote metering technology can not only truly achieve on-line detection at all times without a gas chamber, but also detect distant gas in a safe operation environment. Compared with the traditional closed gas chamber or open gas chamber method, the remote metering technology allows tunable diode laser absorption spectrum technology to come out from laboratories and makes a stride towards site measurement.
Description
Technical field
The invention belongs to the Gas Thickness Detecting Technology field, relate to a kind of gas concentration based on the optical gas sensing technology and detect, be specifically related to a kind of hand-held gas sensing system based on optics remote measurement camera lens.
Background technology
Utilize spectral remote sensing technology atmospheric sounding composition and characteristic to start from 1970, its basis is the interaction between electromagnetic radiation and atom and molecule.About the detection of concentration its according to be in atmosphere certain trace gas composition in the absorbent properties of ultraviolet, visible and infrared spectrum wave band.
The tunable diode laser absorption spectroscopy technology is a kind of optics and spectroscopy measurements technology, optics/spectroscopy measurements technology can realize remote on-line monitoring, having the such environmental effects of being subjected to is little, the response time is short, can realize low concentration gasmetry, measurement result tested gas mean concentration level and the advantage such as non-spot measurement in can the reflected measurement environment, is a kind of desirable gaseous contamination object detecting method.Remote optical sensing is to utilize the light path of several kilometers even longer to replace the sampling pond of traditional experiment chamber or the air chamber of opening, it is so-called open circuit (open-path) structure, it is a kind of long light path absorption techniques based on the tunable diode laser absorption spectroscopy technology, at present multiplexly in aircraft etc., be exclusively used on the equipment of remote sensing survey, measure cost and device structure all more complicated, and then cause use occasion very limited.Although the concentration that trace gas detected that existing tunable diode laser absorption spectroscopy technology can quick high accuracy, the shortcomings such as but equipment related owing to using is more, need special-purpose air chamber, instrument is expensive, easily damage and be awkward, make that the existing cost of measuring system based on this technology is higher, system complex, during test, the professional of technician had relatively high expectations, the universal difficulty of using is larger.
Summary of the invention
The object of the invention is to for overcome existing gas or trace gas measurement of concetration commercial measurement cost high, measure occasion and be subjected to technical limitation and measure the professional defect such as have relatively high expectations, a kind of hand-held gas sensing system based on optics remote measurement camera lens has been proposed.
Technical scheme of the present invention is: based on the hand-held gas sensing system of optics remote measurement camera lens, comprise laser instrument and probe unit, it is characterized in that, described gas sensing system also comprises data processing unit, shell and lens protection case, described shell is the hollow tube-shape structure, described laser instrument is fixed on the axis of shell, the laser of laser instrument emission penetrates along shell axis direction, described lens protection case is installed on an end of laser device laser outgoing on shell, probe unit is installed on the other end of enclosure, described data processing unit is connected with probe unit, signal for the treatment of the probe unit detection.
Further, described gas sensing system comprises display unit, and described display unit is arranged on the end end face that probe unit is installed on shell.
Further, described gas sensing system comprises Fresnel Lenses, and described Fresnel Lenses is arranged between enclosure laser instrument and probe unit and focuses on probe unit.
Further, the upper shaft position of described Fresnel Lenses comprises a through hole, and described through-hole aperture and laser instrument external diameter are complementary, for fixed laser.
Further, on described lens protection case, be coated with anti-reflection film.
Further, described gas sensing system comprises the collimation unit, and described collimation cellular installation is in the laser emitting end of laser instrument, for laser alignment.
Further, described gas sensing system also comprises handle, and described handle is positioned on shell the hand-held use for equipment.
Further, described gas sensing system also comprises control module, and described control module is connected with laser instrument, controls for laser tuning.
Further, described control module is installed in handle, and comprises portable power source, and described portable power source is used to the equipment power supply.
Further, described gas sensing system also comprises data storage cell, and described data storage cell is connected with data processing unit, for the data message of storage detection unit detection.
Further, described gas sensing system also comprises wireless communication unit, and described wireless communication unit is connected with data processing unit with storage unit simultaneously, the data message of surveying be used to exporting probe unit.
Further, described gas sensing system also comprises reflector element, and described reflector element is positioned over laser device laser and penetrates on path, for the laser reflection return-air body sensor-based system that laser instrument is penetrated.
Beneficial effect of the present invention: the hand-held gas sensing system based on optics remote measurement camera lens of the present invention is by being applied to the hand-held gas detection system by the distant reading type Detection Techniques, have the following advantages: telemetry not only can be without air chamber, the real Always Online" of accomplishing detects, and can also in the operating environment of a safety, survey gas at a distance.With traditional closed air chamber or open air chamber method, compare, telemetry makes the tunable diode laser absorption spectroscopy technology from laboratory, coming out of, and has stepped major step to in-site measurement.And a kind of as in optics and spectroscopy technology of tuning diode laser absorption spectrum technology compares with other optical technology, the simple cost of equipment is low, has high spectral resolution and sensitivity, is applicable to measuring CO, NH
3, NO, NO
2, CH
4, O
2, H
2The gases such as O.Have portable, efficient characteristics, and be not subjected to the impact of applied environment, have higher practical value and promotion prospect.
The accompanying drawing explanation
Fig. 1 is the system architecture schematic diagram of the embodiment of the present invention;
Fig. 2 is the Fresnel lens structure schematic diagram of the embodiment of the present invention;
Fig. 3 is the shell mechanism schematic diagram of the embodiment of the present invention.
Description of reference numerals: laser instrument 1, probe unit 2, data processing unit 3, shell 4, display unit 5, Fresnel Lenses 6, collimation unit 7, control module 8, lens protection case 9, handle 10, reflector element 11, open space 12, fixed support 13.
Embodiment
Below in conjunction with accompanying drawing, specific embodiments of the invention are further described.
As shown in Figure 1, a kind of hand-held gas sensing system based on optics remote measurement camera lens of the present embodiment comprises laser instrument (preferred wavelength range is 1527-1610nm) 1 and probe unit (responding range is preferably 0.9-1.9um) 2, wherein laser instrument 1 is surveyed required laser signal be used to generating, and this laser signal is reflected back after by the space be detected.The laser reflected is due to the impact of detected space gas componant and/or content, and the spectral informations such as its energy, phase place can produce corresponding variation, and the laser signal after this variation shines on probe unit.Probe unit is converted to corresponding electric signal by the laser signal of incident.Time delay after the detector acknowledge(ment) signal can calculate the distance between reflection position and hand-held gas sensing system.The gas sensing system of the present embodiment also comprises data processing unit 3, shell 4 and lens protection case 9; described shell 4 is the hollow tube-shape structure; described laser instrument 1 is fixed on the axis of shell 4; the laser of laser instrument 1 emission penetrates along shell 4 axis directions; described lens protection case 9 is installed on an end of laser instrument 1 laser emitting on shell 4; probe unit 2 is installed on the other end of shell 4 inner spaces; described data processing unit 3 is connected with probe unit 2, the signal detected for the treatment of probe unit 2.Because probe unit is generally photoelectric conversion unit, its output signal is and the corresponding simulating signal of incident optical signal, calculation process for the ease of data, the output terminal of described probe unit is connected with a data processing unit 3, the Main Function of data processing unit 3 is that the amplification of the simulating signal from probe unit 2 also (is generally to phase-locked amplification) is converted to digital signal, so that computing machine is further analyzed processing.Because the modules such as laser instrument 1, probe unit 2 and data processing unit 3 need to be avoided external interference, and need to keep clean, therefore be provided with shell 4.In the present embodiment, shell 4 is dust cover, has dustproof effect, can slow down by using dust cover the problem that measuring accuracy that long-term use causes reduces, and extends the serviceable life of system.In order to protect laser instrument 1; on the shell of the present embodiment, be provided with lens protection case; lens protecting cap has formed dustproof cavity together with shell; has simultaneously the printing opacity effect; to guarantee normally passing through of laser; in order further to reduce the impact of lens protection case on laser signal, the present embodiment is provided with anti-reflection film on its lens protection case.
Main its hand-held convenience that embodies a little due to the hand-held gas sensing system, in order to make the data of testing, can be processed more timely and be shown, be provided with in the present embodiment display unit 5, described display unit 5 is installed on the end end face that probe unit 2 is installed on shell 4, this display unit 5 is connected with data processing unit 3, for showing the signal of surveying from probe unit, this signal comprises spectral signal, strength signal and the signal after data processing unit processing processing.
Further, in the present embodiment, gas sensing system also comprises Fresnel Lenses 6, and Fresnel Lenses 6 is arranged between shell 4 inner laser devices 1 and probe unit 2 and focuses on probe unit 2.By Fresnel Lenses is set, increased detection angle and the detection accuracy of this gas sensing system.In the scheme of the present embodiment, to state the upper shaft position of Fresnel Lenses 6 and be provided with a through hole, described through-hole aperture and laser instrument external diameter are complementary, for fixed laser.Because Fresnel Lenses is positioned at the zone in laser instrument dead astern in use owing to by laser instrument, being blocked in fact and not playing a role, in the present embodiment, its borehole is used for to fixed laser, while is the volume of reduction system integral body further, this is particularly favourable for hand held system, and not take the sacrificial system performance and be cost.
For the optimization to system performance, consider, the present embodiment has further proposed following scheme: 1, gas sensing system is set up collimation unit (the preferably collimation lens of graded index) 7, described collimation unit 7 is installed on the laser emitting end of laser instrument, collimates for Laser Focusing.2, gas sensing system is set up control module 8, described control module 8 is connected with laser instrument 1, for the tuning control of laser instrument 1, makes same equipment can export multi-wavelength's laser signal, to adapt to the detection to different objects, and control is presented at correlation parameter on display unit.3, described gas sensing system also comprises handle 10, described handle 10 is positioned on shell 4 the hand-held use for equipment, the purpose one of handle setting is to be to facilitate equipment to use, with hand-held, hold, handle is set to hollow structure simultaneously, for the internal element of equipment such as control module and battery unit etc. provides storage space.4, control module 8 is installed in handle 10, and comprises portable power source, described portable power source is used to the equipment power supply, and portable power source can be the various portable power sources such as accumulator, lithium battery or dry cell.5, described gas sensing system also comprises data storage cell, described data storage cell is connected with data processing unit 3, data message for the detection of storage detection unit, this data message can be derived and carry out the deep processing processing at other any computing equipments on such as computer by data-interface, to break through the restriction of the data processing unit computing power that handheld device carries.6, in gas sensing system, set up wireless communication unit, described wireless communication unit is connected with data processing unit with storage unit simultaneously, the data message of surveying be used to exporting probe unit.Described wireless communication unit can be 3G module, WIFI, bluetooth and other various wireless communication units.Receiving end as data can be also such as terminals such as mobile phone or computers, and can realize real-time Data Transmission and monitoring.7, described gas sensing system also comprises reflector element, and described reflector element is positioned over laser device laser and penetrates on path, for the laser reflection return-air body sensor-based system that laser instrument is penetrated.Described reflector element to system emitting laser reflection obviously, poor to overcome in the open environment of directly facing the reflective function such as the place ahead barrier such as body of wall, causes the insecure defect of test data.
Below in conjunction with the course of work of system and the principle gas sensing system to the present embodiment, be described further:
The control module 8 of opening laser instrument makes laser instrument 1 startup work; after after Laser emission, process collimates unit 7; the angle of divergence diminishes; directivity is better; from the lens protection case 9 that scribbles anti-reflection film, penetrate; pass through open space 12, incide on the reflector element 11 of body of wall, buildings or system, segment beam is passed lens protection case 9 after reflector element 11 reflections of body of wall, buildings or system and is incided on Fresnel Lenses 6.After Fresnel Lenses 6 focuses on, beam propagation is to the photosurface of the probe unit (photodetector) 2 at its place, focal position, light signal transfers electric signal to, while time of return inhibit signal, in data processing unit 3, electric signal is adopted into lock-in amplifier, with phase lock amplifying technology, detect the second harmonic signal caused by gas concentration, thereby reach the purpose that detects gas concentration, finally obtain the signal relevant with gas concentration and process and be presented on display unit (liquid crystal display) 5 with software programming.By regulating the electric current of laser control unit 8, laser instrument 1 can be exported the laser of continuous a plurality of wavelength, coordinate the photodetector 2 of wide probe response sensitivity just can realize detection and the measurement to multiple gases, thereby can bring into play to greatest extent the effect of whole system.
Be below the detection principle detailed annotation of gas detection system:
Because gas with various has different absorption spectrums to infrared light, the characteristic spectrum absorption intensity of some gases is relevant with the concentration of gas, utilizes this principle can measure specific gas concentration.Utilize the absorption peak of gas in the silica fibre transmission window, measure the light intensity attenuation produced due to gas absorption, be finally inversed by the concentration of gas.
Spectral absorption method is the method for gas concentration that detects by the variation that detects gas transmitted light intensity or reflective light intensity.Every kind of gas molecule has absorption (or radiation) spectrum signature of oneself, and the emission spectrum of light source is only just producing absorption with the overlapping part of gas absorption spectrum, and the light intensity after absorption will change.From on spectral limit, being divided into infrared spectrum absorption process and ultraviolet spectrum absorption process.
When a branch of light intensity is I
0The directional light of input light is when being filled with the air chamber of gas, if light source light spectrum covers one or more gaseous absorption lines, light is decayed during by gas, according to the Beer-Lambert law, output intensity I (λ) with input light intensity I
0(λ) and the pass between gas concentration be
I(λ)=I
0(λ)exp(-α
λLC)
α
λCertain wavelength site concentration that places an order, the Absorption of Medium coefficient of unit length; L is the length that absorbs path; C is gas concentration.By following formula, can be obtained
Formula shows, if L and α
λKnown, by detecting I (λ) and I
0(λ) just can record the concentration of gas.Spectral absorption method that Here it is detects the ultimate principle of gas concentration.
This method can be carried out to most gas concentration the measurement of degree of precision, and a large advantage of absorption-type gas sensor is to have simple and reliable air chamber structure, and as long as the transposing light source just can detect by same system the gas of variable concentrations.Based on spectral absorption, detect gas technology, can realize high selectivity, high-resolution, highly sensitive, quick response, noncontact on-line monitoring to gas, do not have poisoning problem, use safety, the instrument maintenance amount is low.
Because the interaction of light and gas to be measured is mainly manifested in the infrared absorption effect of gas sample to light wave.All there is stronger absorption line in a lot of gas in infrared range of spectrum, wherein some spectral line can adapt with the low-loss transmission window of existing light source and optical fiber preferably.By detecting gas, can obtain the concentration parameter of gas to the direct power absorbed of luminous energy, yet many disturbing factors are arranged in light path, make the method for direct absorption detecting often not reach due index, so people design many technology and methods that are intended to improve detection sensitivity.These methods are development along with the development of light source and corresponding light device.
For the ease of understanding, below provide the related table of a gas componant with the wavelength absorbed:
| Gas componant | Absorbing wavelength |
| O 2 | 761nm、764nm |
| HF | 1268.7nm、1305nm、1312.5nm |
| H 2O | 1368.59nm、1383nm、1392nm |
| NH 3 | 1512nm |
| C 2H 2 | 1532.68nm |
| CO | 1567nm |
| H 2S | 1578nm |
| CO 2 | 1580nm、2.0um |
| CH 4 | 1650.9nm、1653.7nm、1660nm |
| HCl | 1745nm |
The hand-held gas sensing system based on optics remote measurement camera lens of the present embodiment is applicable to building, tunnel, and vertical shaft, sewer and pipeline gas-monitoring level, detect the leakage of natural gas pipe; Colliery-detect methane in colliery, to prevent the blast in colliery; Environment and refuse landfill-by detecting the discharge of methane and carbon dioxide in refuse landfill, thus raise the efficiency, strengthen to the monitoring of polluting and to the collection of carbon emission tax; The energy-coal gas layer, original position gasification, the development in oil and natural gas field.In the observation process of gas, all need to use this device.
Described hand-held optics remote measurement camera lens has following advantage: (1) field survey, gas information is difficult for distortion.(2) instrument is without sports apparatus, and reliability is high, easy to maintenance, and operating cost is close to zero (only being the electricity charge).(3) non-cpntact measurement, have the badly adaptive faculty of industrial environment such as very strong high temperature, high dust and deep-etching.(4) easy to carry, to measure saferly, sensitivity is higher.
As shown in Figure 2, the Fresnel Lenses lens surface is simultaneously the light face, the another side imprinting ascending concentric circles.Between each groove part and adjacent grooves, angle is different, but all light is concentrated to a place, forms gonglion, the namely focus of lens.Each groove part is an independently lenslet, and light is adjusted to directional light or optically focused, and it can make incident light converge, and produces great light intensity, effective, and cost is more much lower than common convex lens.
As shown in Figure 3, this figure is the inside fixed support schematic diagram of shell, by inner fixed support 13, and shell 4, laser instrument 1, collimation unit 7 forms.
The foregoing is only the specific embodiment of the present invention, one skilled in the art will appreciate that and can carry out various modifications, replacement and change to the present invention in the disclosed technical scope of the present invention.Therefore the present invention should not limited by above-mentioned example, and should limit with the protection domain of claims.
Claims (10)
1. based on the hand-held gas sensing system of optics remote measurement camera lens, comprise laser instrument and probe unit, it is characterized in that, described gas sensing system also comprises data processing unit, shell and lens protection case, described shell is the hollow tube-shape structure, described laser instrument is fixed on the axis of shell, the laser of laser instrument emission penetrates along shell axis direction, described lens protection case is installed on an end of laser device laser outgoing on shell, probe unit is installed on the other end of enclosure, described data processing unit is connected with probe unit, signal for the treatment of the probe unit detection.
2. the hand-held gas sensing system based on optics remote measurement camera lens according to claim 1, is characterized in that, described gas sensing system comprises display unit, and described display unit is arranged on the end end face that probe unit is installed on shell.
3. the hand-held gas sensing system based on optics remote measurement camera lens according to claim 1, it is characterized in that, described gas sensing system comprises Fresnel Lenses, and described Fresnel Lenses is arranged between enclosure laser instrument and probe unit and focuses on probe unit.
4. the hand-held gas sensing system based on optics remote measurement camera lens according to claim 3, is characterized in that, the upper shaft position of described Fresnel Lenses comprises a through hole, and described through-hole aperture and laser instrument external diameter are complementary, for fixed laser.
5. the hand-held gas sensing system based on optics remote measurement camera lens according to claim 4, is characterized in that, is coated with anti-reflection film on described lens protection case.
6. the hand-held gas sensing system based on optics remote measurement camera lens according to claim 1, is characterized in that, described gas sensing system comprises the collimation unit, and described collimation cellular installation is in the laser emitting end of laser instrument, for laser alignment.
7. according to the described hand-held gas sensing system based on optics remote measurement camera lens of arbitrary claim of claim 1-6, it is characterized in that, described gas sensing system also comprises handle and control module, described handle is positioned on shell the hand-held use for equipment, described control module is connected with laser instrument, controls for laser tuning, and described control module is installed in handle, and comprise that portable power source, described portable power source are used to the equipment power supply.
8. the hand-held gas sensing system based on optics remote measurement camera lens according to claim 1, it is characterized in that, described gas sensing system also comprises data storage cell, and described data storage cell is connected with data processing unit, for the data message of storage detection unit detection.
9. the hand-held gas sensing system based on optics remote measurement camera lens according to claim 1, it is characterized in that, described gas sensing system also comprises wireless communication unit, described wireless communication unit is connected with data processing unit with storage unit simultaneously, the data message of surveying be used to exporting probe unit.
10. according to claim 8 or claim 9 the hand-held gas sensing system based on optics remote measurement camera lens, it is characterized in that, described gas sensing system also comprises reflector element, described reflector element is positioned over laser device laser and penetrates on path, for the laser reflection return-air body sensor-based system that laser instrument is penetrated.
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