CN102998282A - Open circuit laser methane gas detection system - Google Patents
Open circuit laser methane gas detection system Download PDFInfo
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- CN102998282A CN102998282A CN2012105583604A CN201210558360A CN102998282A CN 102998282 A CN102998282 A CN 102998282A CN 2012105583604 A CN2012105583604 A CN 2012105583604A CN 201210558360 A CN201210558360 A CN 201210558360A CN 102998282 A CN102998282 A CN 102998282A
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Abstract
The invention 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 and a receiving terminal circuit, wherein the lens is used for converging lasers; the transmitting terminal circuit comprises an MCU (Micro Controller 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 a laser incident end of the beam shaping mechanism, and the detector is arranged corresponding to a 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 the methane gas can be carried out in real time, the detection sensitivity is high, the response speed is high, and the anti-jamming capability is strong.
Description
Technical field
The present invention relates to a kind of gas detecting system, specifically, related to a kind of open circuit laser methane gas detecting system.
Background technology
In the defeated process of exploitation, collection of oil gas, various forms of leakages will have a strong impact on atmospheric environment and people life property safety; Because 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 again a kind of potent greenhouse gases simultaneously, 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 the 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 is subject to gas componant easily.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 objective of the invention 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 solution adopted in the present invention 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 in order to produce the required modulation signal of realization methane gas centre wavelength scanning to be measured, and described signal generating circuit connects described laser instrument in order to realize methane gas centre wavelength scanning to be measured according to modulation signal by laser instrument; 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 the analog voltage signal that contains concentration of methane gas information through amplifying backward microcontroller circuit; 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 present invention has outstanding substantive distinguishing features and marked improvement, specifically, the present invention has the following advantages: 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, and detection sensitivity height, fast response time, strong, the anti-steam of antijamming capability disturb, report to the police rapid and accuracy is high, the overlay area wide, can realize that Real Time Monitoring, sensor can not poisoned, 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 the defect problem that exists in methane gas leakage field, 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, technical scheme of the present invention 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 in order to produce the required modulation signal of realization methane gas centre wavelength scanning to be measured, and described signal generating circuit connects described laser instrument in order to realize methane gas centre wavelength scanning to be measured according to modulation signal by laser instrument; 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 the analog voltage signal that contains concentration of methane gas information through amplifying backward microcontroller circuit; 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, the laser that beam shaping mechanism sends laser instrument becomes 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 finished 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, amplifies with operational amplifier, then 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 the 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, calculates after the concentration of gas and output contains 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.Because the high monochromaticity of semiconductor laser with tunable, therefore can utilize an isolated absorption line of gas molecule that the absorption spectrum of gas is measured, thereby can from the composite pollution composition, identify easily different molecules, 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 technical scheme of the present invention is not intended to limit; Although with reference to preferred embodiment the present invention is had been described in detail, those of ordinary skill in the field are to be understood that: still can make amendment or the part technical characterictic is equal to replacement the specific embodiment of the present invention; And not breaking away from the spirit of technical solution of the present invention, it all should be encompassed in the middle of the technical scheme scope that the present invention asks for protection.
Claims (3)
1. open circuit laser methane gas detecting system, it 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 in order to produce the required modulation signal of realization methane gas centre wavelength scanning to be measured, and described signal generating circuit connects described laser instrument in order to realize methane gas centre wavelength scanning to be measured according to modulation signal by laser instrument; 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 the analog voltage signal that contains concentration of methane gas information through amplifying backward microcontroller circuit; 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. claim 1 or 2 described open circuit laser methane gas detecting systems, it is characterized in that: described microcontroller circuit connects warning circuit by signal output apparatus.
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| CN2012105583604A CN102998282A (en) | 2012-12-21 | 2012-12-21 | Open circuit laser methane gas detection system |
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| CN2012105583604A CN102998282A (en) | 2012-12-21 | 2012-12-21 | Open circuit laser methane gas detection system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103398976A (en) * | 2013-07-12 | 2013-11-20 | 河南汉威电子股份有限公司 | Reflection type open circuit laser gas detection system |
| CN109630907A (en) * | 2019-02-27 | 2019-04-16 | 北京航星网讯技术股份有限公司 | Vehicle-mounted laser CH_4 detection device |
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| CN1715876A (en) * | 2005-07-12 | 2006-01-04 | 吉林大学 | Detecting method and device for methane concentration |
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| CN102346133A (en) * | 2010-08-06 | 2012-02-08 | 北京大方科技有限责任公司 | Coalmine gas monitoring device and method |
| CN202994656U (en) * | 2012-12-21 | 2013-06-12 | 河南汉威电子股份有限公司 | Open circuit laser methane gas detection system |
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2012
- 2012-12-21 CN CN2012105583604A patent/CN102998282A/en active Pending
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN2091457U (en) * | 1991-03-30 | 1991-12-25 | 温州市电子技术研究所 | Intelligence light interference gas detecting instrument |
| CN1715876A (en) * | 2005-07-12 | 2006-01-04 | 吉林大学 | Detecting method and device for methane concentration |
| CN101514961A (en) * | 2009-03-30 | 2009-08-26 | 山东省科学院激光研究所 | Mine optical fiber gas monitoring conversion device |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103398976A (en) * | 2013-07-12 | 2013-11-20 | 河南汉威电子股份有限公司 | Reflection type open circuit laser gas detection system |
| CN103398976B (en) * | 2013-07-12 | 2015-12-16 | 河南汉威电子股份有限公司 | Reflective open circuit laser gas detection system |
| CN109630907A (en) * | 2019-02-27 | 2019-04-16 | 北京航星网讯技术股份有限公司 | Vehicle-mounted laser CH_4 detection device |
| CN109630907B (en) * | 2019-02-27 | 2020-05-22 | 北京航星网讯技术股份有限公司 | Vehicle-mounted laser methane detection device |
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Application publication date: 20130327 |