CN101915740A - Gas metering monitoring device and monitoring method - Google Patents
Gas metering monitoring device and monitoring method Download PDFInfo
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- CN101915740A CN101915740A CN 201010241720 CN201010241720A CN101915740A CN 101915740 A CN101915740 A CN 101915740A CN 201010241720 CN201010241720 CN 201010241720 CN 201010241720 A CN201010241720 A CN 201010241720A CN 101915740 A CN101915740 A CN 101915740A
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Abstract
The invention discloses gas metering monitoring device and monitoring method. The device comprises a laser, a signal detector, a laser control module, a signal processing module, a data analysis module and a sample room, wherein the laser control module is connected with the laser and is used for driving the laser to transmit laser light with a specified wavelength to a sample gas in the sample room; the signal detector is used for acquiring a transmission signal passing through the sample gas in the sample room and sending the transmission signal to the signal processing module; the signal processing module is used for converting the transmission signal into the absorption spectrum of gas to be tested; and the data analysis module is used for analyzing the absorption spectrum of the gas to be tested to obtain the information of the gas to be tested. The metering monitoring scheme can not be influenced by moisture, dust and other factors and can increase the metering monitoring accuracy of the gas to be tested.
Description
Technical field:
The present invention relates to the environmental monitoring field, relate in particular to a kind of gas metering monitoring device and monitoring method.
Background technology:
At agreed CDM (the Clean Development Mechanism of Kyoto Protocol, Clean Development Mechanism) under, developed country can invest in developing country, obtain the greenhouse CER in the mode that is lower than home costs, both can realize the reduction of discharging target that developed country promises to undertake in Kyoto Protocol, social economy's sustainable development of country in helping again promoting development.The data metering accuracy of CDM project is most important, and the measure monitor of particularly relevant with greenhouse gases (methane, carbon dioxide etc.) gas is the key that the CDM project quality guarantees.All CDM projects must be according to the monitoring plan of formulating, monitor afterwards, and will be through after relevant verification and the authentication, the CERs that project produces is is just signed and issued by executive council of the United Nations, therefore, gas dosing monitoring result is to embody a most important factor of CDM project operation effect.
Common employing infrared spectrum technology is realized the measure monitor to gas in the prior art, its ultimate principle is when infrared light passes through gas to be measured, these gas molecules have absorption to the infrared light of specific wavelength, it absorbs relation and obeys lambert--Bill (Lambert-Beer) absorption law, be that some gas carries out selective absorption to infrared light, its absorption intensity changes the concentration that depends on tested gas.Device based on infrared spectrum technology adopts light-emitting components such as tungsten filament or nickel filament as light source usually, and the reception wavelength of monitor is selected, and according to the parameters such as concentration of certain composition in the measure monitor gases to be measured such as reception wavelength of monitor with bandpass interference filter.
By the research to prior art, the inventor finds, in the gas dosing monitoring scheme of this employing infrared spectrum technology, because of infrared ray is vulnerable to the interference of other factors such as water vapor, dust in the sample gas, caused the degree of accuracy of measure monitor lower.
Summary of the invention
For solving the problems of the technologies described above, the object of the present invention is to provide a kind of gas dosing device for monitoring and monitoring method, with when gas to be measured is carried out measure monitor, reduce the interference of other factorses such as water vapor, dust and carbon dioxide, improve the degree of accuracy of gas dosing monitoring to be measured.
For achieving the above object, the invention provides following technical scheme:
A kind of gas metering monitoring device comprises: laser instrument, signal sensor, laser instrument control module, signal processing module, data analysis module and sample chamber;
Described laser instrument control module is connected to described laser instrument, is used for driving the laser of described laser instrument to the sample gas emission specific wavelength of described sample chamber;
Described signal sensor is used for obtaining the transmission signal by described sample chamber sample gas, and described transmission signal is sent to described signal processing module;
Described signal processing module is used for described transmission signal is converted to gas absorption spectra to be measured;
Described data analysis module is used to analyze described gas absorption spectra to be measured, obtains the information of gas to be measured.
Preferably, described signal processing module comprises:
Signal amplification unit is used to amplify the transmission signal that described signal sensor gets access to;
Signal demodulation unit is used for the transmission signal after demodulation is amplified, and obtains gas absorption spectra to be measured.
Preferably, described device also comprises:
Phase-locked amplifying circuit is used for obtaining the frequency-doubled signal curve from gas absorption spectra to be measured;
Described data analysis module obtains the information of gas to be measured by the peak value of analyzing described frequency-doubled signal.
Preferably, described device also comprises:
Display module is connected to described data analysis module, is used to show the information of the gas to be measured that monitors.
Preferably, described sample chamber is the simple sample chamber or repeatedly reflects the sample chamber.
Preferably, described laser instrument is semiconductor distributed feed-back formula laser instrument or semiconductor vertical cavity surface emitting laser.
Preferably, described laser control module comprises:
Temperature control unit is connected to described laser instrument, is used to control the working temperature of described laser instrument;
Current control unit is connected to described laser instrument, is used to modulate the electric current by described laser instrument.
Preferably, when gas to be measured was methane, described specific wavelength was:
Any wavelength in 1310nm～1345nm, 1630～1700nm, 2150nm～2450nm or 3130nm～3500nm zone.
Preferably, when gas to be measured was carbon dioxide, described specific wavelength was:
Any wavelength in 1430nm～1450nm, 1565nm～1620nm, 1950～1980nm, 1995nm～2100nm or 2665nm～2850nm zone.
Corresponding to the above-mentioned gas metering monitor, the present invention also provides a kind of gas dosing monitoring method, comprising:
Launch specific laser beam to the sample chamber;
Receive transmission signal by sample gas in the described sample chamber;
Described transmission signal is converted to gas absorption spectra to be measured;
Analyze the information that described gas absorption spectra to be measured obtains gas to be measured.
Preferably, described transmission signal is converted to gas absorption spectra to be measured, comprises:
Described transmission signal is converted to electric signal by light signal;
Amplify described transmission signal, and the transmission signal after the demodulation amplification, gas absorption spectra to be measured obtained.
The present invention also provides another kind of gas dosing monitoring method, comprising:
Low frequency sawtooth wave and high_frequency sine wave stack rear drive laser instrument are launched specific laser beam to the sample chamber;
Obtain the transmission signal that comprises high-frequency information by gas to be measured in the described sample chamber;
Described transmission signal is converted to gas absorption spectra to be measured;
Obtain the frequency-doubled signal curve in the absorption spectrum spectral line;
The peak value of analyzing described frequency-doubled signal obtains the information of gas to be measured.
Preferably, the peak value of the described frequency-doubled signal of described analysis obtains also comprising before the information of gas to be measured:
Obtain the pressure and temperature value of sample chamber in real time;
According to the accessed described frequency-doubled signal curve of pressure and temperature value correction.
Use the technical scheme that the embodiment of the invention provided, in the gas metering monitoring device and monitoring method that is provided, adopt laser to substitute infrared light of the prior art as light source, because laser has excellent monochromaticity, can choose single gas absorption spectra spectral line as the target of measuring, therefore measure monitor scheme provided by the invention can not be subjected to the influence of other factorses such as moisture, dust, can improve the degree of accuracy to gas dosing monitoring to be measured.In addition, laser instrument is compared with infrared transmitter, has high reliability, high stability, can not drift about, not need advantages such as frequent location and calibration.
Description of drawings
In order to be illustrated more clearly in the embodiment of the invention or technical scheme of the prior art, to do to introduce simply to the accompanying drawing of required use in embodiment or the description of the Prior Art below, apparently, accompanying drawing in describing below only is some embodiments of the present invention, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain other accompanying drawing according to these accompanying drawings.
The structural representation of the gas-detecting device that provides in the embodiment of the invention one is provided Fig. 1;
Direct absorption line and the modulation absorption line synoptic diagram of Fig. 2 for providing in the embodiment of the invention one;
The schematic flow sheet of the gas dosing monitoring method that provides in the embodiment of the invention two is provided Fig. 3;
The schematic flow sheet of the gas dosing monitoring method that provides in the embodiment of the invention three is provided Fig. 4.
Embodiment
In the prior art in the gas dosing monitoring scheme of the infrared spectrum technology that usually adopts, be vulnerable to the interference of other factorses such as water vapor in the sample gas, dust and carbon dioxide because of infrared ray, caused the degree of accuracy of measure monitor lower.
Provide a kind of gas metering monitoring device for solving the embodiment of the invention, it is characterized in that, having comprised: laser instrument, signal sensor, laser instrument control module, signal processing module, data analysis module and sample chamber; Described laser instrument control module is connected to described laser instrument, is used for driving the laser beam of described laser instrument to the sample gas emission specific wavelength of described sample chamber; Described signal sensor is used for obtaining the transmission signal by described sample chamber sample gas, and described transmission signal is sent to described signal processing module; Described signal processing module is used for described transmission signal is converted to gas absorption spectra to be measured; Described data analysis module is used to analyze described gas absorption spectra to be measured, obtains the information of gas to be measured.
Based on the above-mentioned gas metering monitor, the embodiment of the invention also provides a kind of gas dosing monitoring method, comprising: launch specific laser beam to the sample chamber; Receive transmission signal by sample gas in the described sample chamber; Described transmission signal is converted to gas absorption spectra to be measured; Analyze the information that described gas absorption spectra to be measured obtains gas to be measured.
Based on the above-mentioned gas metering monitor, the embodiment of the invention also provides another kind of gas dosing monitoring method, it is characterized in that, comprising: low frequency sawtooth wave and high_frequency sine wave stack rear drive laser instrument are launched specific laser beam to the sample chamber; Obtain the transmission signal that comprises high-frequency information by gas to be measured in the described sample chamber; Described transmission signal is converted to gas absorption spectra to be measured; Obtain the frequency-doubled signal curve in the absorption spectrum spectral line; The peak value of analyzing described frequency-doubled signal obtains the information of gas to be measured.
Gas metering monitoring device that the specific embodiment of the invention provides and monitoring method, adopt laser to substitute infrared light of the prior art as light source, because laser has excellent monochromaticity, can choose single gas absorption spectra spectral line as the target of measuring, therefore measure monitor scheme provided by the invention can not be subjected to the influence of other factorses such as moisture, dust, can improve the degree of accuracy to gas dosing monitoring to be measured.In addition, laser instrument is compared with infrared transmitter, has high reliability, high stability, can not drift about, not need advantages such as frequent location and calibration.
It more than is the application's core concept, below in conjunction with the accompanying drawing in the embodiment of the invention, the technical scheme in the embodiment of the invention is clearly and completely described, obviously, described embodiment only is the present invention's part embodiment, rather than whole embodiment.Based on the embodiment among the present invention, those of ordinary skills belong to the scope of protection of the invention not making the every other embodiment that is obtained under the creative work prerequisite.
Embodiment one:
A kind of structural representation of the gas-detecting device that Fig. 1 provides for the embodiment of the invention one, this device comprises:
Described laser instrument control module 103 is connected to described laser instrument 101, is used for driving the laser of described laser instrument 101 to the sample gas emission specific wavelength of described sample chamber 106.
Described laser instrument 101 can be tunable diode laser, concrete can be semiconductor distributed feed-back formula laser instrument or semiconductor vertical cavity surface emitting laser.
Feed sample gas in the described sample chamber 106.The sample chamber can or repeatedly be reflected for the simple sample chamber in described sample chamber 106, and the described sample chamber of repeatedly reflecting is specifically as follows two secondary reflection sample chambers, Herriott type or White type and repeatedly reflects the sample chamber.Adopt and repeatedly reflect the sample chamber, can improve the length of test path, improve measuring accuracy and sensitivity.
Described laser instrument control module 103, operating temperature that can be by changing laser instrument and pass through electric current, come the laser of drive laser modulate emission specific wavelength, frequency and waveform, the wherein common waveform that adopts can be sawtooth wave, triangular wave and sine wave.Described laser instrument control module specifically can comprise: temperature control unit 103a, be connected to described laser instrument, and be used to control the working temperature of described laser instrument; Current control unit 103b, be connected to described laser instrument, be used to modulate electric current, the adjustment of laser instrument input current by described laser instrument, not only can change the output frequency of laser instrument, the output wavelength of modulated laser scans the absorption spectrum spectral line of gas to be measured simultaneously.By laser instrument control module 103 control laser instruments 101 continuous tuning in the certain wavelengths scope, make gas to be measured in this particular range of wavelengths, have absorption line.
With when gas to be measured is that methane is example, described specific wavelength can for:
Any wavelength in 1310nm～1345nm, 1630～1700nm, 2150nm～2450nm or 3130nm～3500nm zone.
Concrete, can select arbitrarily but be not limited to any one monitoring wavelength in the following wavelength value as methane gas:
1312.7nm、1314.2nm、1314.6nm、1316.4nm、1318.3nm、1320.2nm、1324.0nm、1325.9nm、1327.8nm、1329.6nm、1331.6nm、1337.1nm、1339.1nm、1340.8nm、1341.0nm、1343.0nm、1630.5nm、1632.9nm、635.4nm、1637.7nm、1640.4nm、1642.9nm、1645.5nm、1648.2nm、1652.0nm、1653.7nm、1656.5nm、1659.4nm、1662.3nm、1666.0nm、1671.4nm、1674.5nm、1677.6nm、1680.8nm、1684.0nm、1687.3nm、1690.7nm、1694.0nm、1697.4nm。
With when gas to be measured is that carbon dioxide is an example, described specific wavelength can for:
Any wavelength in 1430nm～1450nm, 1565nm～1620nm, 1950～1980nm, 1995nm～2100nm or 2665nm～2850nm zone.
Concrete, can select arbitrarily but be not limited to any one monitoring wavelength in the following wavelength value as carbon dioxide:
1431.3nm、1431.4nm、1431.6nm、1431.7nm、1431.9nm、1432.0nm、1432.2nm、1432.5nm、1432.7nm、1432.9nm、1435.6nm、1436.0nm、1436.4nm、1436.8nm、1437.2nm、1437.7nm、1438.1nm、1438.6nm、1439.1nm、1439.6nm、2001.1nm、2001.6nm、2002.0nm、2002.5nm、2003.0nm、2003.5nm、2004.0nm、2004.6nm、2005.1nm、2005.6nm、2006.2nm、2006.6nm、2011.5nm、2012.2nm、2012.9nm、2013.6nm、2014.3nm、2015.0nm、2015.8nm、2016.5nm、2017.3nm、2018.1nm、2018.9nm、2019.7nm。
The technical scheme that the embodiment of the invention provided not only goes for the Measuring and testing of methane and carbon dioxide, and is applicable to as oxygen, sulfuretted hydrogen, the Measuring and testing of other gas such as ammonia.Corresponding to certain gas to be measured, the corresponding specific wavelength of selection that can be corresponding does not repeat them here.
Described signal sensor 102 is used for obtaining the transmission signal by described sample chamber 406 sample gases, and described transmission signal is sent to described signal processing module 104.Described signal sensor 102 can be converted to electric signal by light signal with described transmission signal.
Described signal processing module 104 is used for described transmission signal is converted to gas absorption spectra to be measured.In order to improve measure monitor result's precision, before transmission signal is converted to gas absorption spectra to be measured, can also amplify described transmission signal, therefore, described signal processing module specifically can comprise: signal amplification unit 104a is used to amplify the transmission signal that described signal sensor gets access to; Signal demodulation unit 104b is used for the transmission signal after demodulation is amplified, and obtains gas absorption spectra to be measured.
Described data analysis module 105 is used to analyze described gas absorption spectra to be measured, obtains the information of gas to be measured.
In addition, as shown in Figure 1, the gas metering monitoring device that present embodiment provides can also comprise: display module 107, be connected to described data analysis module 105, and be used to show the information of the gas to be measured that monitors.
The gas-detecting device that the embodiment of the invention provided can adopt direct absorption spectrum technology or modulated optical absorption spectra technology to realize the gas dosing monitoring.
When adopting direct absorption spectrum technology to realize the gas dosing monitoring, described data analysis module can obtain the concentration of gas to be detected based on following mode:
Based on the principle of lambert-law of Beer (Beer-Lambert ' s law), lambert-law of Beer has been described the relation of transmitted light intensity and incident intensity when monochromatic light passes the uniform gas medium.Lambert-law of Beer is referring to formula 1:
Wherein, τ
vTransmissivity for laser; I
tAnd I
oBe respectively the initial light intensity and the transmitted light intensity of laser; α (ν) [cm
-1] be the absorption coefficient of spectrum; L[cm] be optical path length.α (ν) L represents the absorption intensity of spectrum.Initial light intensity I
0Can obtain in the following way: 1, choose in the transmitted light intensity not by the part of gas absorption, carry out fitting of a polynomial, obtain initial light intensity I
02, the output laser of laser instrument is divided into two bundles, a branch of light is by the sample air chamber, and another bundle is used to obtain the initial light intensity of laser by pick-up unit.3, in laser instrument inside the laser intensity detector is set, the initial light intensity signal of laser intensity signal conduct that adopts this detector to obtain.
P[atm wherein] be stagnation pressure, the numerical value of pressure can measure by pressure transducer, L[cm] and be optical path length, determine that by the length and the order of reflection of sample chamber X is the concentration of gas to be measured, S (T) [cm
-2/ atm] be absorption intensity, A[cm
-1] be the spectrum integral area.Below in other formula, but the meaning cross-references that same letter is represented repeats no more.
Because of integral area is proportional to the dividing potential drop of tested gas, therefore according to formula 2, the concentration X of gas to be measured can be obtained by formula 3:
P[atm wherein] be stagnation pressure, L[cm] be optical path length, S (T) [cm
-2/ atm] be absorption intensity, A[cm
-1] be the spectrum integral area.
The modulated optical absorption spectra technology is widely used for minimum gas and detects, and than direct absorption spectrum technology, the modulated optical absorption spectra technology can obviously improve accuracy of detection.When adopting frequency modulation absorption spectrum technology to realize the gas dosing monitoring, laser control module is launched specific laser beam with low frequency sawtooth wave and high_frequency sine wave stack rear drive laser instrument to the sample chamber.
Described gas metering monitoring device can also comprise: phase-locked amplifying circuit is used for obtaining the frequency-doubled signal curve from gas absorption spectra to be measured; Lock-in amplifier can be transferred to high-frequency region from low frequency region with measuring the territory, can obviously reduce noise, improves accuracy of detection.
Described data analysis module obtains the information of gas to be measured by the peak value of analyzing described frequency-doubled signal, and concrete account form is as follows:
The output frequency of laser instrument is as shown in Equation (4):
Wherein
Be the centre frequency of laser instrument, a[cm
-1] be modulation amplitude, f
m[Hz] is modulating frequency.Spectral transmission factor can pass through Taylor series (formula 5) to launch:
Wherein
Be the n level Fourier coefficient of transmission absorption, shown in formula (6) and formula (7):
To gas absorption intensity when more weak, referring to formula 8:
SPX φ (ν) L≤0.05 formula 8.
Transmission coefficient can be approximated to be shown in the formula 9:
N subharmonic Fourier coefficient can be reduced to shown in the formula 10:
Wherein, two frequencys multiplication (2f) signal is by the most widely used signal.Main cause has 2 points: the center that the line style symmetry of two frequency-doubled signals and peak value are positioned at spectral line; Two frequencys multiplication are signals the strongest in the even harmonic.Two frequency-doubled signals are not only relevant with the spectrum parameter (for example absorption intensity) of spectral line, and with relating to parameters such as modulation amplitude.
According to formula (10), the Fourier coefficient of second harmonic as shown in Equation 11:
By above-mentioned formula,, can calculate the content of gas to be measured in sample gas in conjunction with the peak value that obtains the frequency-doubled signal curve in the gas absorption spectra to be measured.
As shown in Figure 2, show the absorption line of direct absorption line, a frequency multiplication, two frequencys multiplication and frequency tripling among the figure respectively.
In the gas metering monitoring device that present embodiment provided, adopt laser to substitute infrared light of the prior art as light source, because laser has excellent monochromaticity, can choose single gas absorption spectra spectral line as the target of measuring, therefore measure monitor scheme provided by the invention can not be subjected to the influence of other factorses such as moisture, dust, can improve the degree of accuracy to gas dosing monitoring to be measured.In addition, laser instrument is compared with infrared transmitter, has high reliability, high stability, can not drift about, not need advantages such as frequent location and calibration.
The gas metering monitoring device that provides in corresponding and the foregoing description one, the embodiment of the invention also provides a kind of gas dosing monitoring method, and this method realizes based on direct absorption spectrum technology, is described in detail in embodiment two:
Embodiment two:
Referring to shown in Figure 3, the schematic flow sheet of the gas dosing monitoring method that provides for present embodiment, this method specifically may further comprise the steps:
S301 launches specific laser beam to the sample chamber;
S302 receives the transmission signal by sample gas in the described sample chamber;
S303 is converted to gas absorption spectra to be measured with described transmission signal;
S304 analyzes the information that described gas absorption spectra to be measured obtains gas to be measured.
Wherein, described described transmission signal is converted to gas absorption spectra to be measured, specifically can comprises:
Described transmission signal is converted to electric signal by light signal;
Amplify described transmission signal, and the transmission signal after the demodulation amplification, gas absorption spectra to be measured obtained.
For the gas dosing monitoring method that present embodiment provides,,, do not repeat them here so relevant part gets final product referring to the explanation of installing embodiment because it is substantially corresponding to the gas metering monitoring device that provides among the embodiment one.
The gas metering monitoring device that provides in corresponding and the foregoing description one, the embodiment of the invention also provides a kind of gas dosing monitoring method, this method realizes based on the modulated optical absorption spectra technology, the method that provides in the embodiment two, this method can obviously improve accuracy of detection, is described in detail in embodiment three:
Embodiment three:
Shown in figure, the schematic flow sheet of the gas dosing monitoring method that provides for present embodiment, this method specifically may further comprise the steps:
S401 launches specific laser beam with low frequency sawtooth wave and high_frequency sine wave stack rear drive laser instrument to the sample chamber;
S402 obtains the transmission signal that comprises high-frequency information by gas to be measured in the described sample chamber;
S403 is converted to gas absorption spectra to be measured with described transmission signal;
S404 obtains the frequency-doubled signal curve in the absorption spectrum spectral line;
S405, the peak value of analyzing described frequency-doubled signal obtains the information of gas to be measured.
Wherein, in order to make resulting gas information to be measured more accurate, before the peak value of the described frequency-doubled signal of described analysis obtains the information of gas to be measured, can also comprise:
Obtain the pressure and temperature value of sample chamber in real time;
According to the accessed described frequency-doubled signal curve of pressure and temperature value correction.
Like this, in the sample chamber, under the situation of the different pressures of sample gas and temperature, can realize frequency-doubled signal is revised in real time, temperature and pressure is made compensation, thereby obtain more accurate gas information to be measured.
For the gas dosing monitoring method that present embodiment provides,,, do not repeat them here so relevant part gets final product referring to the explanation of installing embodiment because it is substantially corresponding to the gas metering monitoring device that provides among the embodiment one.
Use the technical scheme that the embodiment of the invention provided, adopt laser to substitute infrared light of the prior art as light source, because laser has excellent monochromaticity, can choose single gas absorption spectra spectral line as the target of measuring, therefore measure monitor scheme provided by the invention can not be subjected to the influence of other factorses such as moisture, dust, can improve the degree of accuracy to gas dosing monitoring to be measured.In addition, laser instrument is compared with infrared transmitter, has high reliability, high stability, can not drift about, not need advantages such as frequent location and calibration.This scheme not only goes for the Measuring and testing of methane and carbon dioxide, and is applicable to as oxygen, sulfuretted hydrogen, the Measuring and testing of other gas such as ammonia.
For the embodiment of the method for the present invention, because it is substantially corresponding to device embodiment, relevant part gets final product referring to the part explanation of installing embodiment.Device embodiment described above only is schematic, wherein said unit as the separating component explanation can or can not be physically to separate also, the parts that show as the unit can be or can not be physical locations also, promptly can be positioned at a place, perhaps also can be distributed on a plurality of equipment.Can select wherein some or all of module to realize the purpose of present embodiment scheme according to the actual needs.Those of ordinary skills promptly can understand and implement under the situation of not paying creative work.
In several embodiment that the application provided, should be understood that disclosed apparatus and method not surpassing in the application's the spirit and scope, can realize in other way.Current embodiment is a kind of exemplary example, should be as restriction, and given particular content should in no way limit the application's purpose.For example, the division of described unit or subelement only is that a kind of logic function is divided, and during actual the realization other dividing mode can be arranged, and for example a plurality of unit or a plurality of subelement combine.In addition, a plurality of unit can or assembly can in conjunction with or can be integrated into another system, or some features can ignore, or do not carry out.
In addition, the synoptic diagram of institute's tracing device and method and different embodiment, in the scope that does not exceed the application, can with other system, module, technology or method in conjunction with or integrated.Another point, the shown or coupling each other discussed or directly to be coupled or to communicate to connect can be by some interfaces, the indirect coupling of device or unit or communicate to connect can be electrically, machinery or other form.
Each embodiment adopts the mode of going forward one by one to describe in this instructions, and what each embodiment stressed all is and the difference of other embodiment that identical similar part is mutually referring to getting final product between each embodiment.To the above-mentioned explanation of the disclosed embodiments, make this area professional and technical personnel can realize or use the present invention.Multiple modification to these embodiment will be conspicuous concerning those skilled in the art, and defined herein General Principle can realize under the situation that does not break away from the spirit or scope of the present invention in other embodiments.Therefore, the present invention will can not be restricted to these embodiment shown in this article, but will meet and principle disclosed herein and features of novelty the wideest corresponding to scope.
Claims (13)
1. a gas metering monitoring device is characterized in that, comprising: laser instrument, signal sensor, laser instrument control module, signal processing module, data analysis module and sample chamber;
Described laser instrument control module is connected to described laser instrument, is used for driving the laser of described laser instrument to the sample gas emission specific wavelength of described sample chamber;
Described signal sensor is used for obtaining the transmission signal by described sample chamber sample gas, and described transmission signal is sent to described signal processing module;
Described signal processing module is used for described transmission signal is converted to gas absorption spectra to be measured;
Described data analysis module is used to analyze described gas absorption spectra to be measured, obtains the information of gas to be measured.
2. device according to claim 1 is characterized in that, described signal processing module comprises:
Signal amplification unit is used to amplify the transmission signal that described signal sensor gets access to;
Signal demodulation unit is used for the transmission signal after demodulation is amplified, and obtains gas absorption spectra to be measured.
3. device according to claim 1 is characterized in that, also comprises:
Phase-locked amplifying circuit is used for obtaining the frequency-doubled signal curve from gas absorption spectra to be measured;
Described data analysis module obtains the information of gas to be measured by the peak value of analyzing described frequency-doubled signal.
4. device according to claim 1 is characterized in that, also comprises:
Display module is connected to described data analysis module, is used to show the information of the gas to be measured that monitors.
5. device according to claim 1 is characterized in that:
Described sample chamber is the simple sample chamber or repeatedly reflects the sample chamber.
6. device according to claim 1 is characterized in that:
Described laser instrument is semiconductor distributed feed-back formula laser instrument or semiconductor vertical cavity surface emitting laser.
7. device according to claim 1 is characterized in that, described laser control module comprises:
Temperature control unit is connected to described laser instrument, is used to control the working temperature of described laser instrument;
Current control unit is connected to described laser instrument, is used to modulate the electric current by described laser instrument.
8. device according to claim 1 is characterized in that, when gas to be measured was methane, described specific wavelength was:
Any wavelength in 1310nm～1345nm, 1630～1700nm, 2150nm～2450nm or 3130nm～3500nm zone.
9. device according to claim 1 is characterized in that, when gas to be measured was carbon dioxide, described specific wavelength was:
Any wavelength in 1430nm～1450nm, 1565nm～1620nm, 1950～1980nm, 1995nm～2100nm or 2665nm～2850nm zone.
10. a gas dosing monitoring method is characterized in that, comprising:
Launch specific laser beam to the sample chamber;
Receive transmission signal by sample gas in the described sample chamber;
Described transmission signal is converted to gas absorption spectra to be measured;
Analyze the information that described gas absorption spectra to be measured obtains gas to be measured.
11. method according to claim 10 is characterized in that, described transmission signal is converted to gas absorption spectra to be measured, comprising:
Described transmission signal is converted to electric signal by light signal;
Amplify described transmission signal, and the transmission signal after the demodulation amplification, gas absorption spectra to be measured obtained.
12. a gas dosing monitoring method is characterized in that, comprising:
Low frequency sawtooth wave and high_frequency sine wave stack rear drive laser instrument are launched specific laser beam to the sample chamber;
Obtain the transmission signal that comprises high-frequency information by gas to be measured in the described sample chamber;
Described transmission signal is converted to gas absorption spectra to be measured;
Obtain the frequency-doubled signal curve in the absorption spectrum spectral line;
The peak value of analyzing described frequency-doubled signal obtains the information of gas to be measured.
13. method according to claim 12 is characterized in that, the peak value of the described frequency-doubled signal of described analysis obtains also comprising before the information of gas to be measured:
Obtain the pressure and temperature value of sample chamber in real time;
According to the accessed described frequency-doubled signal curve of pressure and temperature value correction.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103323423A (en) * | 2013-05-24 | 2013-09-25 | 深圳市赛宝伦计算机技术有限公司 | Anti-interference method and system for gas concentration analysis based on laser |
| CN105699326A (en) * | 2016-02-29 | 2016-06-22 | 西安邮电大学 | Device and method for monitoring oxygen concentration |
| CN106053361A (en) * | 2016-05-20 | 2016-10-26 | 西安交通大学 | Spectrum reading and processing method and device of multiple sample cell spectral quantitative analysis |
| CN106053361B (en) * | 2016-05-20 | 2019-01-18 | 西安交通大学 | A kind of spectrum of Multi-example pond quantitative spectrochemical analysis is read and processing method and processing device |
| CN105911010A (en) * | 2016-06-12 | 2016-08-31 | 北京千安哲信息技术有限公司 | Trace gas pollutant detecting device and method |
| CN106053376A (en) * | 2016-08-16 | 2016-10-26 | 北京千安哲信息技术有限公司 | Gas pollutant detection device |
| CN107064058A (en) * | 2017-01-05 | 2017-08-18 | 中国地质调查局水文地质环境地质调查中心 | A kind of shale gas leakage multiple gases on-Line Monitor Device and method |
| CN107064058B (en) * | 2017-01-05 | 2020-08-21 | 中国地质调查局水文地质环境地质调查中心 | Shale gas leakage multiple gas online monitoring device and method |
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