CN103105366B - Method and device for detecting CO2 carbon isotope by infrared spectrum - Google Patents
Method and device for detecting CO2 carbon isotope by infrared spectrum Download PDFInfo
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- CN103105366B CN103105366B CN201310023557.2A CN201310023557A CN103105366B CN 103105366 B CN103105366 B CN 103105366B CN 201310023557 A CN201310023557 A CN 201310023557A CN 103105366 B CN103105366 B CN 103105366B
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Abstract
The invention discloses a method and a device for detecting CO2 carbon isotope by infrared spectrum; and the device comprises a reflecting pool, an infrared source, an off-axis parabolic mirror, an interferometer, an infrared detector connected with a computer, a target gas input gas circuit used for inputting CO2-containing target gas, and a standard gas input gas circuit used for inputting standard CO2 gas with the known delta 13 CO2 value. The method and the device can be used for obtaining the delta 13 CO2 value of the detected gas according to the infrared spectrum acquired by the infrared detector.
Description
Technical field
the present invention relates to environmental monitoring technology and analysis and optical technical field, be specially a kind of CO
2carbon isotope infrared spectrum pick-up unit.
Background technology
CO
2one of most important greenhouse gases in air, because different isotope exists different physics, chemistry, biological change procedure, therefore, Analysis for CO
2carbon isotope ratio is conducive to determining carbon Sources and sinks, for Global Carbon discharge budget provides Data support.In recent years, CO
2gaseous carbon isotopic ratio detection technique is obtained for widespread use in multiple research field.For example: in environmental science and ecosystem scientific domain, the conversion process of energy of occurring in nature can supervene CO mostly
2, but different carbon isotopes reflects different courses of reaction, discloses the Different Effects of the natural cause such as soil, plant and all kinds of human activity; In volcanic explosion forecasting research, earth's crust release gas can with earth's surface on by the rock in path or other liquid reactions, therefore, δ
13cO
2the change of value can as judging that volcanicity strengthens, the efficiency index of prediction of volcanic eruption; In area of medical diagnostics, gas isotope detects and can also diagnose as non-invasive medical, CO
2isotopic ratio be considered to helicobacter pylori exist mark (Nobel Prize in Physiology of Medicine in 2005), peptic ulcer is relevant to this bacterium with cancer of the stomach, therefore, can pass through to characteristics of contaminated respiratory droplets CO
2gas δ
13cO
2the detection of value change carrys out the diseases such as early diagnosis peptic ulcer and cancer of the stomach.
At present, CO
2the classic method that carbon isotope ratio detects is isotope mass spectrometry (IRMS) method.It is different according to the crooked route that causes of molecular mass difference and distinguish isotopic molecule that isotopic mass spectrometry measures isotopic ultimate principle.The method but cannot differentiate the identical isomeride of molecular mass, such as: molecular weight is all 45
13c
16o
2with
12c
16o
17o cannot utilize isotopic mass spectrometry to differentiate, and in addition, isotopic mass spectrometry detects to be needed to sample pre-service, and instrument system is huge, complicated operation, can only carry out lab analysis, have certain limitation, especially be not suitable for real-time continuous coverage.
Infra-red sepectrometry is the spectral analysis technique utilizing gas molecule infrared absorption spectrum characteristic to carry out the measurement of gas qualitative, quantitative, has measuring accuracy high, can realize in real time, the advantage such as online, unmanned, can realize CO
2the on-line analysis of carbon isotope ratio experimental field is measured, and utilizes infra-red sepectrometry Analysis for CO
2carbon isotope ratio effectively can make up the defect of traditional sensing techniques.
Summary of the invention
The object of this invention is to provide a kind of CO
2carbon isotope infrared spectrum pick-up unit, to solve traditional detection CO
2carbon isotope ratio technology cannot realize in real time, the defect of on-line checkingi.
In order to achieve the above object, the technical solution adopted in the present invention is:
CO
2carbon isotope infrared spectrum pick-up unit, it is characterized in that: comprise reflection tank, reflection tank light inlet place is provided with infrared light supply, off-axis parabolic mirror, interferometer, reflection tank light-emitting window place is provided with the infrared eye be connected with computing machine, and reflection tank air intake opening has access to input containing CO by T-valve
2the gas input gas circuit to be measured of gas gas to be measured and the known δ of input
13cO
2the standard C O of value
2the Standard Gases input gas circuit of gas, infrared light supply radiation has the infrared light of continuous infrared waves, infrared light successively through off-axis parabolic mirror collimation, interferometer modulation after enter reflection tank by the light inlet of reflection tank, and in reflection tank through repeatedly after interflection by the outgoing of reflection tank light-emitting window to infrared eye.
Described CO
2carbon isotope infrared spectrum pick-up unit, it is characterized in that: described gas input gas circuit to be measured comprises successively by the gas thief hatch to be measured of pipeline connection, dust filter unit, the Dewar tank of liquid nitrogen is housed, Nafion manages, the drying tube of HE-3 type drying agent is housed, gas meter, gas to be measured enters gas to be measured input gas circuit from gas thief hatch to be measured, dust is filtered successively again through filtrator, Dewar tank carries out one-level drying, Nafion pipe carries out secondary drying, the drying tube that HE-3 type drying agent is housed carries out three-stage drying, sent in reflection tank by T-valve after gas meter metering.
Described Standard Gases input gas circuit comprises successively by Standard Gases air intake opening, the gas meter of pipeline connection, and Standard Gases from Standard Gases air intake opening Engage of standard gas input gas circuit, then is sent in reflection tank by T-valve after gas meter metering.
Described CO
2carbon isotope infrared spectrum pick-up unit, it is characterized in that: described T-valve has the valve port in a, b, c tri-directions, T-valve a direction valve port is connected with reflection tank air intake opening, T-valve b direction valve port access Standard Gases input gas circuit, T-valve c direction valve port accesses gas to be measured input gas circuit,, T-valve a direction valve port normal open; When reflection tank air inlet is Standard Gases, ventilate in T-valve a-b direction valve implication road, and a-c direction valve implication road closes; When reflection tank air inlet is gas to be measured, T-valve a-b direction valve implication mouth closes, and ventilates in a-c direction valve implication road.
Described CO
2carbon isotope infrared spectrum pick-up unit, is characterized in that: described reflection tank gas outlet is communicated with Nafion pipe by flowrate control valve, and the dry gas that reflection tank is discharged sends into Nafion pipe, as the purge gas of Nafion pipe by flowrate control valve.
Described CO
2carbon isotope infrared spectrum pick-up unit, it is characterized in that: described infrared light supply, infrared eye, interferometer form Fourier transform infrared spectrometer, its mid-infrared light source adopts Globar heating element, and infrared eye adopts indium antimonide detector, and interferometer is Michelson interferometer; Fourier infrared spectrograph and reflection tank are placed in seal box jointly, and described seal box has access to blow valve port, and seal box purges high pure nitrogen in real time with 0.5l/min flow velocity in collection spectroscopy procedure.
Described CO
2carbon isotope infrared spectrum pick-up unit, is characterized in that: also comprise pressure monitor system, temperature monitoring system, temperature control system, wherein:
Pressure monitor system comprises high-precision pressure sensing probe and arranges pressure display logging software in a computer, pressure sensing probe is placed in reflection tank, the data line of pressure sensing probe is received on computing machine with pressure data in real time record reflection tank, and pressure situation of change in time in monitoring reflection tank, pressure precision reaches ± 1mb;
The Temperature displaying logging software that temperature monitoring system comprises high-precision temperature sensing probe and arranges in a computer, temperature sensing probe is placed in reflection tank, the data line of temperature sensing probe is received on computer with temperature data in real time record reflection tank, and temperature situation of change in time in monitoring reflection tank, temperature accuracy reaches ± and 0.01 DEG C;
Temperature control system comprises heating plate, temperature feedback control circuit, pt100 temp probe and Temperature displaying gauge outfit, heating plate is enclosed in reflection tank inwall, pt100 temp probe wraps in inside heating plate with Real-Time Monitoring reflection tank surface temperature, heating plate pre-heating temperature is set to 28 DEG C, the temperature that temperature feedback control circuit is monitored according to pt100 controls heating plate break-make, pt100 temp probe and the equal cut-in temperature control enclosure of heating plate, Temperature displaying gauge outfit is arranged in control enclosure, Temperature displaying gauge outfit shows the actual temperature arranging heating-up temperature and pt100 monitoring in real time.
The CO of described device
2carbon isotope infrared spectrum detection method, it is characterized in that: first reflection tank is pumped into fixing low pressure, then in reflection tank, high pure nitrogen is filled with to 1013mb by Standard Gases input gas circuit, repeat above process 3 times, after in pond to be reflected, high pure nitrogen remains on 1013mb constant pressure, 28 DEG C of steady temperatures, utilize infrared light supply to reflection tank irradiating infrared light, and utilize infrared eye to gather high pure nitrogen spectrum spectrum as a setting, as the background of quantitative test;
When having gathered background spectrum, fixing low pressure will be pumped in reflection tank, then be filled with known δ by Standard Gases input gas circuit
13cO
2the standard C O of value
2standard Gases, to 1013mb, repeats above process 3 times, pond internal standard CO to be reflected
2gas utilizes infrared light supply to reflection tank irradiating infrared light after remaining on 1013mb constant pressure, 28 DEG C of steady temperatures, and utilizes infrared eye to gather standard C O
2gaseous spectrum, by background spectrum and standard C O
2gaseous spectrum inverting obtains standard C O
2the δ of gas
13cO
2inverting value, by the δ of inverting
13cO
2inverting value and standard C O
2the δ of gas reality
13cO
2value compares and obtains calibration factor, as the foundation of gas calibration to be measured below;
In reflection tank, gas CO to be measured is filled with finally by gas input gas circuit to be measured
2to 1013mb constant pressure, 28 DEG C of steady temperatures, utilize infrared light supply to reflection tank irradiating infrared light, and utilize infrared eye to gather gas infrared spectrum to be measured, obtained the δ of gas to be measured by background spectrum and gas infrared spectrum to be measured inverting
13cO
2inverting value, then in conjunction with the δ of calibration factor to gas to be measured
13cO
2inverting value carries out revising the δ obtaining gas to be measured
13cO
2measured value.
Described CO
2carbon isotope infrared spectrum detection method, is characterized in that: the infrared light through interferometer modulation forms interference signal, and infrared light, through reflection tank, carries out by interference signal the Absorption Characteristics that spectrogram that Fourier transform obtains characterizes reflection pool gas.
Described CO
2carbon isotope infrared spectrum detection method, is characterized in that: at CO
2will in carbon isotope ratio quantitative inversion
12cO
2with
13cO
2as two kinds independently component treat.
The present invention can realize in real time, online, unmanned measurement CO
2carbon isotope ratio, has widened the application scope of infra-red sepectrometry.
Accompanying drawing explanation
Fig. 1 is structure principle chart of the present invention.
Embodiment
CO
2carbon isotope infrared spectrum pick-up unit, comprise reflection tank, reflection tank light inlet place is provided with infrared light supply, off-axis parabolic mirror, interferometer, and reflection tank light-emitting window place is provided with the infrared eye be connected with computing machine, and reflection tank air intake opening has access to input containing CO by T-valve
2the gas input gas circuit to be measured of gas gas to be measured and the known δ of input
13cO
2the standard C O of value
2the Standard Gases input gas circuit of gas, infrared light supply radiation has the infrared light of continuous infrared waves, infrared light successively through off-axis parabolic mirror collimation, interferometer modulation after enter reflection tank by the light inlet of reflection tank, and in reflection tank through repeatedly after interflection by the outgoing of reflection tank light-emitting window to infrared eye.
Gas to be measured input gas circuit comprise successively by the gas thief hatch to be measured of pipeline connection, dust filter unit, the Dewar tank that liquid nitrogen is housed, Nafion pipe, drying tube, the gas meter of HE-3 type drying agent are housed, gas to be measured enters gas to be measured input gas circuit from gas thief hatch to be measured, then filter dust through filtrator successively, Dewar tank carries out one-level drying, Nafion pipe carries out secondary drying, be equipped with after the drying tube of HE-3 type drying agent carries out three-stage drying, gas meter metering and sent in reflection tank by T-valve.
Standard Gases input gas circuit comprises successively by Standard Gases air intake opening, the gas meter of pipeline connection, and Standard Gases from Standard Gases air intake opening Engage of standard gas input gas circuit, then is sent in reflection tank by T-valve after gas meter metering.
T-valve has the valve port in a, b, c tri-directions, and T-valve a direction valve port is connected with reflection tank air intake opening, T-valve b direction valve port access Standard Gases input gas circuit, and T-valve c direction valve port accesses gas to be measured input gas circuit, T-valve a direction valve port normal open; When reflection tank air inlet is Standard Gases, ventilate in T-valve a-b direction valve implication road, and a-c direction valve implication road closes; When reflection tank air inlet is gas to be measured, T-valve a-b direction valve implication mouth closes, and ventilates in a-c direction valve implication road.
Reflection tank gas outlet is communicated with Nafion pipe by flowrate control valve, and the dry gas that reflection tank is discharged sends into Nafion pipe, as the purge gas of Nafion pipe by flowrate control valve.
Infrared light supply, infrared eye, interferometer form Fourier transform infrared spectrometer, and its mid-infrared light source adopts Globar heating element, and infrared eye adopts indium antimonide detector, and interferometer is Michelson interferometer; Fourier infrared spectrograph and reflection tank are placed in seal box jointly, and described seal box has access to blow valve port, and seal box purges high pure nitrogen in real time with 0.5l/min flow velocity in collection spectroscopy procedure.
Also comprise pressure monitor system, temperature monitoring system, temperature control system, wherein:
Pressure monitor system comprises high-precision pressure sensing probe and arranges pressure display logging software in a computer, pressure sensing probe is placed in reflection tank, the data line of pressure sensing probe is received on computing machine with pressure data in real time record reflection tank, and pressure situation of change in time in monitoring reflection tank, pressure precision reaches ± 1mb;
The Temperature displaying logging software that temperature monitoring system comprises high-precision temperature sensing probe and arranges in a computer, temperature sensing probe is placed in reflection tank, the data line of temperature sensing probe is received on computer with temperature data in real time record reflection tank, and temperature situation of change in time in monitoring reflection tank, temperature accuracy reaches ± and 0.01 DEG C;
Temperature control system comprises heating plate, temperature feedback control circuit, pt100 temp probe and Temperature displaying gauge outfit, heating plate is enclosed in reflection tank inwall, pt100 temp probe wraps in inside heating plate with Real-Time Monitoring reflection tank surface temperature, heating plate pre-heating temperature is set to 28 DEG C, the temperature that temperature feedback control circuit is monitored according to pt100 controls heating plate break-make, pt100 temp probe and the equal cut-in temperature control enclosure of heating plate, Temperature displaying gauge outfit is arranged in control enclosure, Temperature displaying gauge outfit shows the actual temperature arranging heating-up temperature and pt100 monitoring in real time.
A kind of CO
2carbon isotope infrared spectrum detection method, first reflection tank is pumped into fixing low pressure, then in reflection tank, high pure nitrogen is filled with to 1013mb by Standard Gases input gas circuit, repeat above process 3 times, after in pond to be reflected, high pure nitrogen remains on 1013mb constant pressure, 28 DEG C of steady temperatures, utilize infrared light supply to reflection tank irradiating infrared light, and utilize infrared eye to gather high pure nitrogen spectrum spectrum as a setting, as the background of quantitative test;
When having gathered background spectrum, fixing low pressure will be pumped in reflection tank, then be filled with known δ by Standard Gases input gas circuit
13cO
2the standard C O of value
2standard Gases, to 1013mb, repeats above process 3 times, pond internal standard CO to be reflected
2gas utilizes infrared light supply to reflection tank irradiating infrared light after remaining on 1013mb constant pressure, 28 DEG C of steady temperatures, and utilizes infrared eye to gather standard C O
2gaseous spectrum, by background spectrum and standard C O
2gaseous spectrum inverting obtains standard C O
2the δ of gas
13cO
2inverting value, by the δ of inverting
13cO
2inverting value and standard C O
2the δ of gas reality
13cO
2value compares and obtains calibration factor, as the foundation of gas calibration to be measured below;
In reflection tank, gas CO to be measured is filled with finally by gas input gas circuit to be measured
2to 1013mb constant pressure, 28 DEG C of steady temperatures, utilize infrared light supply to reflection tank irradiating infrared light, and utilize infrared eye to gather gas infrared spectrum to be measured, obtained the δ of gas to be measured by background spectrum and gas infrared spectrum to be measured inverting
13cO
2inverting value, then in conjunction with the δ of calibration factor to gas to be measured
13cO
2inverting value carries out revising the δ obtaining gas to be measured
13cO
2measured value.
Infrared light through interferometer modulation forms interference signal, and infrared light, through reflection tank, carries out by interference signal the Absorption Characteristics that spectrogram that Fourier transform obtains characterizes reflection pool gas.
At CO
2will in carbon isotope ratio quantitative inversion
12cO
2with
13cO
2as two kinds independently component treat.
As shown in Figure 1.Fourier transform infrared spectrometer 18, detector 15, light source 17 and multiple reflecting pool 11 are all placed in seal box 13, in spectra collection process, seal box purges with the high pure nitrogen of 0.5l/min flow velocity in real time, ensures, in seal box, light path of optical spectrometer does not contain unnecessary steam and CO
2gas.When the a-b direction of T-valve 8 is closed, during the ventilation of a-c direction, on-the-spot gas to be measured is under the work of aspiration pump, first through the filtration of filtrator 2, filter out the dust in air, then the condensation of tracheae liquid nitrogen in Dewar tank 3 can remove a part of steam in gas to be measured, through one-level drying gas to be measured successively again through Nafion pipe 4 and be equipped with HE-3 high efficiency drier self-indicating drying tube 5 two, three-stage drying, then enter multiple reflections sample cell 11 through gas meter 7 and T-valve 8.When the a-c direction of T-valve 8 is closed, during the ventilation of a-b direction, calibrating gas enters reflection tank through gas meter 7 and T-valve 8.CO
2calibration every day of carbon isotope infrared spectrum pick-up unit once, during calibration, first reflection tank is pumped into fixing low pressure (<1mb), then high pure nitrogen is filled with to 1013mb, repeat above process 3 times, after in pond to be reflected, high pure nitrogen remains on 1013mb, 28 DEG C of steady temperatures, pressure, gather high pure nitrogen spectrum as a setting spectrum be used as the background of later quantitative test; When having gathered background spectrum, low pressure (<1mb) will be pumped in reflection tank, then calibration gas is filled with to 1013mb, repeat above process 3 times, after pond to be reflected internal standard gas remains on 1013mb, 28 DEG C of steady temperatures, pressure, gather calibrating gas spectrum, inverting calibrating gas carbon isotope ratio is as the foundation of gas calibration below.Gather in spectroscopy procedure, every bar spectrum adopts 64scans scanning, at CO
2will in carbon isotope ratio quantitative inversion
12cO
2with
13cO
2as two kinds independently component treat.
Claims (2)
1.CO
2carbon isotope infrared spectrum pick-up unit, it is characterized in that: comprise reflection tank, reflection tank light inlet place is provided with infrared light supply, off-axis parabolic mirror, interferometer, reflection tank light-emitting window place is provided with the infrared eye be connected with computing machine, and reflection tank air intake opening has access to input containing CO by T-valve
2the gas input gas circuit to be measured of gas gas to be measured and the known δ of input
13cO
2the standard C O of value
2the Standard Gases input gas circuit of gas, infrared light supply radiation has the infrared light of continuous infrared waves, infrared light successively through off-axis parabolic mirror collimation, interferometer modulation after enter reflection tank by the light inlet of reflection tank, and in reflection tank through repeatedly after interflection by the outgoing of reflection tank light-emitting window to infrared eye;
Described gas to be measured input gas circuit comprise successively by the gas thief hatch to be measured of pipeline connection, dust filter unit, the Dewar tank that liquid nitrogen is housed, Nafion pipe, drying tube, the gas meter of HE-3 type drying agent are housed, gas to be measured enters gas to be measured input gas circuit from gas thief hatch to be measured, then filter dust through filtrator successively, Dewar tank carries out one-level drying, Nafion pipe carries out secondary drying, be equipped with after the drying tube of HE-3 type drying agent carries out three-stage drying, gas meter metering and sent in reflection tank by T-valve; Described Standard Gases input gas circuit comprises successively by Standard Gases air intake opening, the gas meter of pipeline connection, and Standard Gases from Standard Gases air intake opening Engage of standard gas input gas circuit, then is sent in reflection tank by T-valve after gas meter metering;
Described T-valve has the valve port in a, b, c tri-directions, and T-valve a direction valve port is connected with reflection tank air intake opening, T-valve b direction valve port access Standard Gases input gas circuit, and T-valve c direction valve port accesses gas to be measured input gas circuit, T-valve a direction valve port normal open; When reflection tank air inlet is Standard Gases, ventilate in T-valve a-b direction valve implication road, and a-c direction valve implication road closes; When reflection tank air inlet is gas to be measured, T-valve a-b direction valve implication mouth closes, and ventilates in a-c direction valve implication road;
Described reflection tank gas outlet is communicated with Nafion pipe by flowrate control valve, and the dry gas that reflection tank is discharged sends into Nafion pipe, as the purge gas of Nafion pipe by flowrate control valve;
Described infrared light supply, infrared eye, interferometer form Fourier transform infrared spectrometer, and its mid-infrared light source adopts Globar heating element, and infrared eye adopts indium antimonide detector, and interferometer is Michelson interferometer; Fourier infrared spectrograph and reflection tank are placed in seal box jointly, and described seal box has access to blow valve port, and seal box purges high pure nitrogen in real time with 0.5l/min flow velocity in collection spectroscopy procedure;
Also comprise pressure monitor system, temperature monitoring system, temperature control system, wherein:
Pressure monitor system comprises high-precision pressure sensing probe and arranges pressure display logging software in a computer, pressure sensing probe is placed in reflection tank, the data line of pressure sensing probe is received on computing machine with pressure data in real time record reflection tank, and pressure situation of change in time in monitoring reflection tank, pressure precision reaches ± 1mb;
The Temperature displaying logging software that temperature monitoring system comprises high-precision temperature sensing probe and arranges in a computer, temperature sensing probe is placed in reflection tank, the data line of temperature sensing probe is received on computer with temperature data in real time record reflection tank, and temperature situation of change in time in monitoring reflection tank, temperature accuracy reaches ± and 0.01 DEG C;
Temperature control system comprises heating plate, temperature feedback control circuit, pt100 temp probe and Temperature displaying gauge outfit, heating plate is enclosed in reflection tank inwall, pt100 temp probe wraps in inside heating plate with Real-Time Monitoring reflection tank surface temperature, heating plate pre-heating temperature is set to 28 DEG C, the temperature that temperature feedback control circuit is monitored according to pt100 controls heating plate break-make, pt100 temp probe and the equal cut-in temperature control enclosure of heating plate, Temperature displaying gauge outfit is arranged in control enclosure, Temperature displaying gauge outfit shows the actual temperature arranging heating-up temperature and pt100 monitoring in real time.
2. the CO based on device described in claim 1
2carbon isotope infrared spectrum detection method, it is characterized in that: first reflection tank is pumped into fixing low pressure, then in reflection tank, high pure nitrogen is filled with to 1013mb by Standard Gases input gas circuit, repeat above process 3 times, after in pond to be reflected, high pure nitrogen remains on 1013mb constant pressure, 28 DEG C of steady temperatures, utilize infrared light supply to reflection tank irradiating infrared light, and utilize infrared eye to gather high pure nitrogen spectrum spectrum as a setting, as the background of quantitative test;
When having gathered background spectrum, fixing low pressure will be pumped in reflection tank, then be filled with known δ by Standard Gases input gas circuit
13cO
2the standard C O of value
2standard Gases, to 1013mb, repeats above process 3 times, pond internal standard CO to be reflected
2gas utilizes infrared light supply to reflection tank irradiating infrared light after remaining on 1013mb constant pressure, 28 DEG C of steady temperatures, and utilizes infrared eye to gather standard C O
2gaseous spectrum, by background spectrum and standard C O
2gaseous spectrum inverting obtains standard C O
2the δ of gas
13cO
2inverting value, by the δ of inverting
13cO
2inverting value and standard C O
2the δ of gas reality
13cO
2value compares and obtains calibration factor, as the foundation of gas calibration to be measured below;
In reflection tank, gas CO to be measured is filled with finally by gas input gas circuit to be measured
2to 1013mb constant pressure, 28 DEG C of steady temperatures, utilize infrared light supply to reflection tank irradiating infrared light, and utilize infrared eye to gather gas infrared spectrum to be measured, obtained the δ of gas to be measured by background spectrum and gas infrared spectrum to be measured inverting
13cO
2inverting value, then in conjunction with the δ of calibration factor to gas to be measured
13cO
2inverting value carries out revising the δ obtaining gas to be measured
13cO
2measured value;
Infrared light through interferometer modulation forms interference signal, and infrared light, through reflection tank, carries out by interference signal the Absorption Characteristics that spectrogram that Fourier transform obtains characterizes reflection pool gas;
At CO
2will in carbon isotope ratio quantitative inversion
12cO
2with
13cO
2as two kinds independently component treat.
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|---|---|---|---|
| CN201310023557.2A CN103105366B (en) | 2013-01-22 | 2013-01-22 | Method and device for detecting CO2 carbon isotope by infrared spectrum |
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|---|---|---|---|
| CN201310023557.2A CN103105366B (en) | 2013-01-22 | 2013-01-22 | Method and device for detecting CO2 carbon isotope by infrared spectrum |
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| CN102183482B (en) * | 2011-02-23 | 2012-12-19 | 中国科学院安徽光学精密机械研究所 | Non-disperse infrared multi-component flue gas analyzer |
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