CN202994656U - Open circuit laser methane gas detection system - Google Patents

Open circuit laser methane gas detection system Download PDF

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Publication number
CN202994656U
CN202994656U CN 201220710383 CN201220710383U CN202994656U CN 202994656 U CN202994656 U CN 202994656U CN 201220710383 CN201220710383 CN 201220710383 CN 201220710383 U CN201220710383 U CN 201220710383U CN 202994656 U CN202994656 U CN 202994656U
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China
Prior art keywords
circuit
laser
signal
methane gas
generating circuit
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Expired - Lifetime
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CN 201220710383
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Chinese (zh)
Inventor
赵金领
王书潜
贾林涛
杨清永
鲁志远
胡海芝
郭东歌
陈海永
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Hanwei Electronics Group Corp
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Henan Hanwei Electronics Co Ltd
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Priority to CN 201220710383 priority Critical patent/CN202994656U/en
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Abstract

The utility model provides an open circuit laser methane gas detection system. The open circuit laser methane gas detection system is characterized by comprising a transmitting terminal circuit, a beam shaping mechanism, a lens for converging lasers and a receiving terminal circuit, wherein the transmitting terminal circuit comprises an MCU (Micro Control Unit) processing circuit, a signal generation circuit and a laser device, the MCU processing circuit is connected with the signal generation circuit, and the signal generation circuit is connected with the laser device; the receiving terminal circuit comprises a microprocessor circuit, a signal amplification circuit and a detector, and the detector is connected with the microprocessor circuit through the signal amplification circuit; and the laser device is arranged corresponding to the laser incident end of the beam shaping mechanism, and the detector is arranged corresponding to the laser emergent end of the beam shaping mechanism through the lens. According to the open circuit laser methane gas detection system, the monitoring on the leakage of methane gas can be carried out in real time, the detection sensitivity is high, the response speed is high, and the anti-interference capability is strong.

Description

Open circuit laser methane gas detecting system
Technical field
The utility model relates to a kind of gas detecting system, specifically, has related to a kind of open circuit laser methane gas detecting system.
Background technology
In the exploitation of oil gas, the defeated process of collection, various forms of leakages will have a strong impact on atmospheric environment and people life property safety; Due to the backwardness of detection technique and management level, the oil and gas leakage accident often has generation.Methane is the main combustible component of rock gas, is simultaneously again a kind of potent greenhouse gases, and the greenhouse effect of methane are more than 20 times of carbon dioxide, is to be only second to the greenhouse gases that No. second of carbon dioxide can cause global warming in earth atmosphere.
At present, oil and gas leakage is carried out in the places such as natural gas line, oil platform or combustion gas storage separating station to be detected, can only select semiconductor or catalysis or electrochemical point type detector, the point type detector has that sensitivity is low, response speed is slow, the shortcomings such as surface contamination are disturbed, are subject to poor anti jamming capability, the intersection that easily is subject to gas componant.For fear of generation and the slowing global warming of accident, be badly in need of a kind of open circuit laser methane gas detecting system that can measure in time, accurately the hazardous location concentration of methane gas.
Summary of the invention
The purpose of this utility model is for the deficiencies in the prior art, thereby a kind of open circuit laser methane gas detecting system that satisfies large space, the detection of large tracts of land combustible gas leakage is provided.
To achieve these goals, the technical scheme that the utility model adopts is: a kind of open circuit laser methane gas detecting system, and it comprises transmitting terminal circuit, beam shaping mechanism, the lens that converge laser and receiving terminal circuit; Wherein, described transmitting terminal circuit comprises MCU treatment circuit, signal generating circuit and laser instrument, described MCU treatment circuit connects described signal generating circuit and realizes that the required modulation signal of methane gas centre wavelength scanning to be measured, described signal generating circuit connect described laser instrument in order to realize methane gas centre wavelength scanning to be measured according to modulation signal by laser instrument in order to produce; Described receiving terminal circuit comprises microcontroller circuit, signal amplification circuit and detector, and described detector connects described microcontroller circuit by described signal amplification circuit in order to the light signal that receives is converted to electric signal and exports through amplifying backward microcontroller circuit the analog voltage signal that contains concentration of methane gas information; The sharp light incident side setting of the corresponding described beam shaping of described laser instrument mechanism, described detector arranges by the laser emitting end of the corresponding described beam shaping of described lens mechanism.
Based on above-mentioned, described signal generating circuit comprises saw-tooth wave generating circuit, sine wave generating circuit and totalizer, described saw-tooth wave generating circuit be connected the signal output part of sine wave generating circuit and connect respectively the input end of described totalizer; Described MCU treatment circuit connects respectively the signal input part of described saw-tooth wave generating circuit and described sine wave generating circuit, and the output terminal of described totalizer connects described laser instrument.
Based on above-mentioned, described microcontroller circuit connects warning circuit by signal output apparatus.
The relative prior art of the utility model has substantive distinguishing features and progress, specifically, the utlity model has following advantage: this system can be in places such as natural gas line, oil platform or combustion gas storage separating stations, carry out in real time the monitoring that methane gas leaks, detection sensitivity is high, fast response time, antijamming capability is strong.This system uses for large space, large tracts of land methane gas leak detection, it adopts advanced tunable diode laser absorption spectroscopy technology, detection sensitivity is high, fast response time, antijamming capability is strong, water resistant vapour disturbs, report to the police rapidly and accuracy is high, the overlay area wide, can realize Real Time Monitoring, sensor can be not poisoning, the life-span long, easy care; This system is a kind of methane detection system of passive type, it can solve existing product in the market and use in methane gas leakage field the defect problem that exists, can effectively avoid the generation of methane leakage accident, this system has very high economic benefit and social benefit in the application of field of gas detection.
Description of drawings
Fig. 1 is the structural representation of described open circuit laser methane gas detecting system.
Embodiment
Below by embodiment, the technical solution of the utility model is described in further detail.
As shown in Figure 1, a kind of open circuit laser methane gas detecting system, it comprises transmitting terminal circuit, beam shaping mechanism, the lens that converge laser and receiving terminal circuit; Wherein, described transmitting terminal circuit comprises MCU treatment circuit, signal generating circuit and laser instrument, described MCU treatment circuit connects described signal generating circuit and realizes that the required modulation signal of methane gas centre wavelength scanning to be measured, described signal generating circuit connect described laser instrument in order to realize methane gas centre wavelength scanning to be measured according to modulation signal by laser instrument in order to produce; Described receiving terminal circuit comprises microcontroller circuit, signal amplification circuit and detector, and described detector connects described microcontroller circuit by described signal amplification circuit in order to the light signal that receives is converted to electric signal and exports through amplifying backward microcontroller circuit the analog voltage signal that contains concentration of methane gas information; The sharp light incident side setting of the corresponding described beam shaping of described laser instrument mechanism, described detector arranges by the laser emitting end of the corresponding described beam shaping of described lens mechanism; The laser that laser instrument sends is to beam shaping mechanism, beam shaping mechanism again Laser emission in air, beam shaping mechanism makes the laser that laser instrument sends become the less directional light of the angle of divergence, by beam shaping mechanism, the laser that laser instrument sends is at the 120m place, and spot diameter only has 100mm.
Based on above-mentioned, described signal generating circuit comprises saw-tooth wave generating circuit, sine wave generating circuit and totalizer, described saw-tooth wave generating circuit be connected the signal output part of sine wave generating circuit and connect respectively the input end of described totalizer, the stack of high frequency sinusoidal signal and serrated signal is completed by totalizer; Described MCU treatment circuit connects respectively the signal input part of described saw-tooth wave generating circuit and described sine wave generating circuit, and the output terminal of described totalizer connects described laser instrument.
Based on above-mentioned, described microcontroller circuit connects warning circuit by signal output apparatus.
From the laser that transmitting terminal sends, after air, the laser that arrives receiving end has just comprised the concentration information of gas in the air, be converted to current signal through detector, because this electric current is very faint, amplify with operational amplifier, the output terminal in amplifier obtains voltage signal; The effect of signal amplification circuit and microcontroller circuit is after using the fast Fourier change detection out the second harmonic signal of reflection gas concentration in the analog voltage signal after opto-electronic conversion, to converse the concentration of gas and the signal of the concentration information that contains gas is exported.Signal generating circuit produces modulation signal, drive laser, the laser that laser instrument sends is through beam shaping mechanism, on the detector that shines by open space, detector is converted to electric signal to light signal, the MCU treatment circuit that is integrated with A/D converter by inside after amplifying is processed and is calculated simulating signal, after calculating the concentration of gas and output contain the signal of gas concentration information.When Leakage Gas is arranged, resonance absorption will occur, its absorption intensity is relevant with the concentration of this gas, just can calculate the concentration of gas by measuring Optical Absorption intensity.
The ultimate principle of open circuit laser methane gas detection system is the Beer-Lambert law, namely, beam of laser is by tested gas, when laser instrument sends the wavelength of laser when identical with certain absorption line of tested gas, resonance absorption will occur in gas molecule, and its absorption intensity can be described by the Beer-Lambert law; Because the absorption line of gas is by the gas molecule structures shape, the absorption line of gas with various is different, so anti-gas cross interference performance is strong.When the absorbing wavelength of the emission wavelength of light source and gas matches, resonance absorption will occur, its absorption intensity is relevant with the concentration of this gas, but by measuring the just concentration of measurement gas of Optical Absorption intensity.The tunable semiconductor laser technology is to utilize the narrow linewidth of semiconductor laser with tunable and wavelength with the characteristic realization that Injection Current changes, the very near very indistinguishable Absorption Line of single or several distances of molecule to be measured.High monochromaticity due to semiconductor laser with tunable, therefore can utilize an isolated absorption line of gas molecule that the absorption spectrum of gas is measured, thereby can identify easily different molecules from the composite pollution composition, avoid the interference of spectrum.Open circuit laser methane gas detection technology is according to gas, the principle that the bombardment with laser beams selectivity absorbs to be carried out, when something is subject to laser beam irradiation, this matter selective absorbs the photon of certain frequency, thereby showing as specific wavelength (1.66um) transmission light intensity diminishes, utilize photoelectric device that transmitted intensity is changed and be converted to electric signal, can accurately draw methane concentration through calculating.
This system adopts advanced tunable diode laser absorption spectroscopy technology, have the characteristics such as highly sensitive, that antijamming capability is strong, reaction velocity is fast, it is applied in the places such as natural gas line, oil platform or combustion gas storage separating station usually, but real-time detection methane gas leakage situation; When having methane leak to occur, timely output alarm signal causes the rear class equipment alarm of Central Control Room, reminds the operator on duty to note, in order to take further prevention, remedial measures, thereby effectively prevents the methane leakage accident to occur.
Should be noted that at last: above embodiment is only in order to illustrate that the technical solution of the utility model is not intended to limit; Although with reference to preferred embodiment, the utility model is had been described in detail, those of ordinary skill in the field are to be understood that: still can modify or the part technical characterictic is equal to replacement embodiment of the present utility model; And not breaking away from the spirit of technical solutions of the utility model, it all should be encompassed in the middle of the technical scheme scope that the utility model asks for protection.

Claims (3)

1. open circuit laser methane gas detecting system is characterized in that: it comprises transmitting terminal circuit, beam shaping mechanism, the lens that converge laser and receiving terminal circuit; Wherein, described transmitting terminal circuit comprises MCU treatment circuit, signal generating circuit and laser instrument, described MCU treatment circuit connects described signal generating circuit and realizes that the required modulation signal of methane gas centre wavelength scanning to be measured, described signal generating circuit connect described laser instrument in order to realize methane gas centre wavelength scanning to be measured according to modulation signal by laser instrument in order to produce; Described receiving terminal circuit comprises microcontroller circuit, signal amplification circuit and detector, and described detector connects described microcontroller circuit by described signal amplification circuit in order to the light signal that receives is converted to electric signal and exports through amplifying backward microcontroller circuit the analog voltage signal that contains concentration of methane gas information; The sharp light incident side setting of the corresponding described beam shaping of described laser instrument mechanism, described detector arranges by the laser emitting end of the corresponding described beam shaping of described lens mechanism.
2. open circuit laser methane gas detecting system claimed in claim 1, it is characterized in that: described signal generating circuit comprises saw-tooth wave generating circuit, sine wave generating circuit and totalizer, described saw-tooth wave generating circuit be connected the signal output part of sine wave generating circuit and connect respectively the input end of described totalizer; Described MCU treatment circuit connects respectively the signal input part of described saw-tooth wave generating circuit and described sine wave generating circuit, and the output terminal of described totalizer connects described laser instrument.
3. the described open circuit laser methane of claim 1 or 2 gas detecting system, it is characterized in that: described microcontroller circuit connects warning circuit by signal output apparatus.
CN 201220710383 2012-12-21 2012-12-21 Open circuit laser methane gas detection system Expired - Lifetime CN202994656U (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102998282A (en) * 2012-12-21 2013-03-27 河南汉威电子股份有限公司 Open circuit laser methane gas detection system
CN116046721A (en) * 2023-02-17 2023-05-02 深圳市诺安智能股份有限公司 Correlation open-circuit laser gas detector and gas detection real-time calibration method

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102998282A (en) * 2012-12-21 2013-03-27 河南汉威电子股份有限公司 Open circuit laser methane gas detection system
CN116046721A (en) * 2023-02-17 2023-05-02 深圳市诺安智能股份有限公司 Correlation open-circuit laser gas detector and gas detection real-time calibration method
CN116046721B (en) * 2023-02-17 2023-10-24 深圳市诺安智能股份有限公司 Correlation open-circuit laser gas detector and gas detection real-time calibration method

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CP01 Change in the name or title of a patent holder
CP01 Change in the name or title of a patent holder

Address after: 450001 Zhengzhou high tech Development Zone, Henan, Cedar Road, No. 169

Patentee after: HANWEI ELECTRONICS Group Corp.

Address before: 450001 Zhengzhou high tech Development Zone, Henan, Cedar Road, No. 169

Patentee before: HENAN HANWEI ELECTRONICS Co.,Ltd.

CX01 Expiry of patent term
CX01 Expiry of patent term

Granted publication date: 20130612