CN203385658U - Handheld gas sensing system based on optimal remote sensing lens - Google Patents
Handheld gas sensing system based on optimal remote sensing lens Download PDFInfo
- Publication number
- CN203385658U CN203385658U CN201320451898.5U CN201320451898U CN203385658U CN 203385658 U CN203385658 U CN 203385658U CN 201320451898 U CN201320451898 U CN 201320451898U CN 203385658 U CN203385658 U CN 203385658U
- Authority
- CN
- China
- Prior art keywords
- sensing system
- gas sensing
- laser
- gas
- system based
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Images
Abstract
The utility model provides a handheld gas sensing system based on an optimal remote sensing lens. The handheld gas sensing system can overcome the defects that the measurement cost is high, the measurement occasion is limited by using a technology, the measurement specialty is relatively high in requirement and the like in an existing gas or trace gas concentration measurement technology. The handheld gas sensing system mainly comprises a laser and a detection unit; the gas sensing system comprises a data processing unit, a housing and a lens protection shell. A remote sensing type detection technology is applied to the handheld gas detection system, the handheld gas sensing system based on the optimal remote sensing lens, provided by the utility model, has the advantages that no air chamber can be required by using a remote sensing technology, the real-time on-line detection is carried out really, and gas in a remote place in a safe operation environment can be detected. Compared with a conventional closed gas chamber or opened air chamber method, for the handheld gas sensing system, the remote sensing technology ensures that a tunable diode laser absorption spectrum technology is developed from a laboratory, so that a major step is stridden towards the field measurement.
Description
Technical field
The utility model belongs to the Gas Thickness Detecting Technology field, relates to a kind of gas concentration based on the optical gas sensing technology and detects, and is 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 advantages such as tested gas mean concentration level in can the reflected measurement environment of the such environmental effects of being subject to is little, the response time is short, can realize low concentration gasmetry, measurement result and non-spot measurement, 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 measuring system cost 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.
The utility model content
The purpose of this utility model be for overcome existing gas or trace gas measurement of concetration commercial measurement cost high, measure occasion and be subject 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.
The technical solution of the utility model is: the hand-held gas sensing system based on optics remote measurement camera lens, comprise laser instrument, probe unit and data processing module, it is characterized in that, described gas sensing system also comprises Fresnel Lenses, 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 Fresnel Lenses is arranged between enclosure laser instrument and probe unit and focuses on probe unit.
Further, described gas sensing system comprises display, and described display is arranged on the end end face that probe unit is installed on shell.
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, be coated with anti-reflection film on described lens protection case.
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, for laser tuning, controls.
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 module, the data message of surveying for the storage detection unit.
Further, described gas sensing system also comprises wireless communication unit, and described wireless communication unit is connected with data processing module with storage unit simultaneously, the data message of surveying for 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.
The beneficial effects of the utility model: the hand-held gas sensing system based on optics remote measurement camera lens of the present utility model 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, to gas at a distance, be surveyed.With traditional closed air chamber or open air chamber method, compare, telemetry makes the tunable diode laser absorption spectroscopy technology come out of from laboratory, to in-site measurement, has stepped major step.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.There are portable, efficient characteristics, and be not subject to the impact of applied environment, there is higher practical value and promotion prospect.
The accompanying drawing explanation
The system architecture schematic diagram that Fig. 1 is the utility model embodiment;
The Fresnel lens structure schematic diagram that Fig. 2 is the utility model embodiment;
The shell mechanism schematic diagram that Fig. 3 is the utility model embodiment.
Description of reference numerals: laser instrument 1, probe unit 2, data processing module 3, shell 4, display 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 embodiment of the utility model is 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 for 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 module 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 module 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 module 3, the Main Function of data processing module 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 module 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, by using dust cover, can slow down 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; be provided with lens protection case on the shell of the present embodiment; lens protecting cap has formed dustproof cavity together with shell; there is the printing opacity effect simultaneously; 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, for the data that make test can be processed more timely and be shown, be provided with in the present embodiment display 5, described display 5 is installed on the end end face that probe unit 2 is installed on shell 4, this display 5 is connected with data processing module 3, for showing the signal of surveying from probe unit, this signal comprises spectral signal, strength signal and the signal after data processing module 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 as 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, for Laser Focusing, collimates.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.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 module 3, the data message of surveying for the 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 module computing power that handheld device carries.6, set up wireless communication unit in gas sensing system, described wireless communication unit is connected with data processing module with storage unit simultaneously, the data message of surveying for 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, as poor as reflective functions such as bodies of wall to overcome in the open environment of directly facing the place ahead barrier, causes the insecure defect of test data.
Gas sensing system below in conjunction with the course of work of system and principle to the present embodiment is 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 incided on Fresnel Lenses 6 through lens protection case 9 after reflector element 11 reflections of body of wall, buildings or system.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 module 3, electric signal is adopted into lock-in amplifier, detect the second harmonic signal caused by gas concentration with phase lock amplifying technology, thereby reach the purpose that detects gas concentration, finally obtain the signal relevant with gas concentration and process and be presented on display (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 that the variation by detecting gas transmitted light intensity or reflective light intensity detects gas concentration.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.Can be divided into infrared spectrum absorption process and ultraviolet spectrum absorption process from spectral limit.
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.Can be obtained fom the above equation
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.Detect gas technology based on spectral absorption, 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, and wherein some spectral line can adapt with the low-loss transmission window of existing light source and optical fiber preferably.Can obtain the concentration parameter of gas by detecting 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 monitoring to 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 (being only 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 embodiment of the present utility model, one skilled in the art will appreciate that and can carry out various modifications, replacement and change to the utility model in the disclosed technical scope of the utility model.Therefore the utility model should not limited by above-mentioned example, and should limit with the protection domain of claims.
Claims (9)
1. the hand-held gas sensing system based on optics remote measurement camera lens, comprise laser instrument, probe unit and data processing module, it is characterized in that, described gas sensing system also comprises Fresnel Lenses, 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 Fresnel Lenses is arranged between enclosure laser instrument and probe unit and focuses on probe unit.
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, and described display 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, 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.
4. the hand-held gas sensing system based on optics remote measurement camera lens according to claim 3, is characterized in that, on described lens protection case, is coated with anti-reflection film.
5. 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.
6. according to the described hand-held gas sensing system based on optics remote measurement camera lens of arbitrary claim of claim 1-5, 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, for laser tuning, controls, 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.
7. 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 module, the data message of surveying for the storage detection unit.
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 wireless communication unit, described wireless communication unit is connected with data processing module with storage unit simultaneously, the data message of surveying for exporting probe unit.
9. according to the described hand-held gas sensing system based on optics remote measurement camera lens of claim 7 or 8, 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.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320451898.5U CN203385658U (en) | 2013-07-26 | 2013-07-26 | Handheld gas sensing system based on optimal remote sensing lens |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320451898.5U CN203385658U (en) | 2013-07-26 | 2013-07-26 | Handheld gas sensing system based on optimal remote sensing lens |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203385658U true CN203385658U (en) | 2014-01-08 |
Family
ID=49874135
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320451898.5U Expired - Fee Related CN203385658U (en) | 2013-07-26 | 2013-07-26 | Handheld gas sensing system based on optimal remote sensing lens |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203385658U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107407596A (en) * | 2014-12-12 | 2017-11-28 | 贝尔坦技术有限公司 | Optically filtering equipment for detection gas |
| CN110554001A (en) * | 2019-09-06 | 2019-12-10 | 清华大学合肥公共安全研究院 | Optical system structure of laser methane telemetering device |
| CN113866112A (en) * | 2021-09-27 | 2021-12-31 | 唐山市智明电子科技有限公司 | Portable gas sensing system |
-
2013
- 2013-07-26 CN CN201320451898.5U patent/CN203385658U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107407596A (en) * | 2014-12-12 | 2017-11-28 | 贝尔坦技术有限公司 | Optically filtering equipment for detection gas |
| US10060848B2 (en) | 2014-12-12 | 2018-08-28 | Bertin Technologies | Optical filtering device for detecting gas |
| CN107407596B (en) * | 2014-12-12 | 2019-09-03 | 贝尔坦技术有限公司 | Optically filtering equipment for detection gas |
| CN110554001A (en) * | 2019-09-06 | 2019-12-10 | 清华大学合肥公共安全研究院 | Optical system structure of laser methane telemetering device |
| CN113866112A (en) * | 2021-09-27 | 2021-12-31 | 唐山市智明电子科技有限公司 | Portable gas sensing system |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103411921B (en) | Based on the hand-held gas sensing system of optical telemetry camera lens | |
| CN104132911B (en) | Open type long optical distance CO and CH4 online testing instrument | |
| CN103439233B (en) | Flue dust concentration detection system | |
| CN100460860C (en) | Portable infrared semiconductor laser absorbing type gas detection method and detection apparatus therefor | |
| CN204203093U (en) | A kind of total-reflection type long light path CO analyser | |
| CN104237135A (en) | System and method for detecting CO gas based on quartz tuning fork enhanced photoacoustic spectrometry technology | |
| CN105424631A (en) | Ultrahigh sensitivity nitrogen oxide measurement system based on ultraviolet-visible waveband absorption spectrum | |
| Dong et al. | Compact portable QEPAS multi-gas sensor | |
| CN101256140A (en) | Portable apparatus and measuring method for monitoring gas concentration of sulphur dioxide and nitrous oxide meanwhile | |
| CN101308089B (en) | Ethyne gas optical checking method and apparatus | |
| CN103048285B (en) | Novel method for measuring absorption coefficient of atmospheric aerosol with light-heat method | |
| Shen et al. | Methane near-infrared laser remote detection under non-cooperative target condition based on harmonic waveform recognition | |
| CN203385658U (en) | Handheld gas sensing system based on optimal remote sensing lens | |
| O'Dwyer et al. | Real‐time measurement of volcanic H2S and SO2 concentrations by UV spectroscopy | |
| CN103543120A (en) | Ground short wave infrared CO2 vertical column concentration remote measuring device | |
| CN103411922B (en) | Based on the hand-held gas sensing system of optical telemetry camera lens | |
| CN201152458Y (en) | Urban gas pipeline leakage detection and positioning system | |
| CN203479698U (en) | Handheld gas sensing system based on optical remote sensing camera | |
| CN105021569A (en) | Device for simultaneously monitoring carbon monoxide and methane | |
| CN107064058B (en) | Shale gas leakage multiple gas online monitoring device and method | |
| CN104297207A (en) | TDLAS based laser expiration analyzer and system | |
| CN103411923A (en) | Normalized noise reduction method adopting two-path tunable laser absorption spectrum technology | |
| CN103163090B (en) | Concentration detection system used for polonium aerosol inside reactor workshop | |
| CN203299116U (en) | Cubic cavity embedded type double-channel methane gas concentration real-time monitoring device | |
| CN105180649B (en) | Radiation spectrum detecting system for kiln tail of cement converter |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140108 Termination date: 20150726 |
|
| EXPY | Termination of patent right or utility model |