CN107462521A - A kind of optimal times harmonic signal measurement apparatus of object gas and application process - Google Patents
A kind of optimal times harmonic signal measurement apparatus of object gas and application process Download PDFInfo
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- CN107462521A CN107462521A CN201710695197.9A CN201710695197A CN107462521A CN 107462521 A CN107462521 A CN 107462521A CN 201710695197 A CN201710695197 A CN 201710695197A CN 107462521 A CN107462521 A CN 107462521A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/01—Arrangements or apparatus for facilitating the optical investigation
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
- G01N21/31—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry
Abstract
The present invention relates to a kind of optimal times harmonic signal measurement apparatus of object gas and application process, the optimal times harmonic signal measurement apparatus of object gas based on brand new design, using laser technology, accurately realize under various different temperatures, pressure, the measurement of the optimal times harmonic signal of object gas, be particularly suitable for use in extreme environment, the measurement of the optimal times harmonic signal of object gas, and can substantially increase measurement operating efficiency.
Description
Technical field
The present invention relates to a kind of optimal times harmonic signal measurement apparatus of object gas and application process, belongs to gas detection
Technical field.
Background technology
In the combustion diagnosis under carrying out hyperbaric environment, due to the increase of line width cause it is optimal in wavelength-modulation technique
Modulated amplitude under the index of modulation increases therewith, now from nonlinear strength modulation and etalon effect etc., by optical element
Caused background signal will be very serious and constantly changed, so as to which the extraction to target optical spectrum signal brings difficulty.In high temperature height
There is larger difference between the analog signal and measurement signal of pressure, wherein be on the one hand relevant with the selection of simulation line style, but
In terms of the accuracy that line parameters under HTHP should be mainly attributed to, due to the data in currently used Hitemp databases
Mostly is to be obtained according to normal temperature data by theoretical calculation, therefore it is that temperature and retrieving concentration model are built to accurately measure line parameters
Essential premise in vertical, while the line parameters under HTHP may also function as the effect of supplement correction to database.
The content of the invention
The technical problems to be solved by the invention are to provide a kind of optimal times harmonic signal measurement apparatus of object gas, adopt
Designed with brand new, can accurate measurement know under various temperature, pressure atmosphere, the optimal times harmonic of object gas letter
Number.
In order to solve the above-mentioned technical problem the present invention uses following technical scheme：The present invention devises a kind of object gas most
Good times harmonic signal measurement apparatus, including function signal generator, adder, laser controller, laser, collimation lens,
Sample cell pipeline, heating plant, temperature measuring equipment, signal sensor and data processing and control terminal；Wherein, data processing control
Terminal and function signal generator processed, which is connected, carries out signal interaction；The output end of function signal generator and the input of adder
It is connected；The output end of adder is connected with the input of laser controller, the output end of laser controller and the control of laser
End processed is connected, and is controlled by laser controller according to received data for laser；The output end of laser is pointed to accurate
One end of straight lens；Sample cell pipe ends set laser light incident end and laser ejecting end respectively, and the laser of sample cell pipeline enters
End is penetrated to open wide respectively with laser ejecting end, and it is logical to be connected with each other, and sample cell pipeline inner laser incidence end projects with laser
The center line of connected region is straight line between end；The laser light incident end of sample cell pipeline and laser ejecting end difference sealed set are high
Reflectivity lens, and the primary optical axis of two high reflectance lens is co-linear with one another；The other end of collimation lens points to sample cell pipeline
High reflectance lens on laser light incident end, the high reflectance lens directional signal detector on sample cell pipeline laser ejecting end
Signal receiving end, the output end of signal sensor is connected with data processing and control terminal input；Sample cell pipeline appearance
Face is sealing structure, and sample cell pipe surface sets object gas input channel and object gas output channel, connects sample cell
Pipeline interior or exterior space, and valve is set respectively on object gas input channel and object gas output channel；Sample cell pipe
Road surface also sets up pressure control pipeline, connects sample cell pipeline interior or exterior space, and sets valve on pressure control pipeline,
Inputted by pressure control pipeline, the protective gas that output does not blend with laser becomes to adjust the air pressure in sample cell pipeline
Change；Heating plant is located at sample cell pipeline external, for being heated for sample cell pipeline；Temperature measuring equipment is located at sample
Pond pipeline external, and the measurement end of temperature measuring equipment passes through sample cell pipe surface, inside sample cell pipeline, for examining
Survey sample cell pipeline internal temperature.
As a preferred technical solution of the present invention：Also include purifier, oppositely facing swashing on the collimation lens
The other end of light device is relative with the laser light incident end of purifier to be connect, on the laser ejecting end docking sample cell pipeline of purifier
The high reflectance lens at laser light incident end, the center line of the center line at laser light incident end and laser ejecting end is each other on purifier
Collinearly, the protective gas not blended with laser is filled in purifier.
As a preferred technical solution of the present invention：The protective gas not blended with laser is high-purity N2。
As a preferred technical solution of the present invention：The temperature measuring equipment is thermocouple.
As a preferred technical solution of the present invention：The laser is DFB semiconductor laser.
The optimal times harmonic signal measurement apparatus of a kind of object gas of the present invention using above technical scheme with it is existing
Technology is compared, and has following technique effect：The optimal times harmonic signal measurement apparatus of a kind of object gas that the present invention designs, is adopted
Designed with brand new, introduce laser technology, can accurately realize under various different temperatures, pressure, the optimal number of object gas
The measurement of harmonic signal.
Based on the above-mentioned designed optimal times harmonic signal measurement apparatus of object gas, the technology of the invention also to be solved is asked
Topic is to provide the application process of the optimal times harmonic signal measurement apparatus of object gas a kind of, can accurate measurement know various temperature
Under degree, pressure atmosphere, the optimal times harmonic signal of object gas.
In order to solve the above-mentioned technical problem the present invention uses following technical scheme：The present invention devises one kind will based on right
The application process of the 2 optimal times harmonic signal measurement apparatus of object gas is sought, for obtaining under different temperatures, air pressure environment
The optimal times harmonic signal of object gas；For the laser through the sample cell pipeline, measure as follows：
Step A. using room temperature as sample cell pipeline in Current Temperatures, and enter step B；
Step B. carries out vacuumize process for sample cell pipeline, and it is right respectively to measure vacuum sample pond pipeline under Current Temperatures
The background signal of each harmonic signal is answered, subsequently into step C；Wherein, each harmonic signal be 1 rd harmonic signal to M times it is humorous
The each harmonic signal of ripple signal, M are to preset maximum rd harmonic signal；
Step C. injects object gas and the protective gas not blended with laser to sample cell pipeline, and passes through tune
The injection rate for the protective gas not blended with laser is saved, it is default initial gas pressure value to control air pressure in sample cell pipeline, as
Current gas pressure in sample cell pipeline, and initiation parameter n=2, subsequently into step D；
Step D. measurements Current Temperatures, under air pressure 1 rd harmonic signal complete waveform, and through lock-in amplifier and data at
Reason, obtain 1 rd harmonic signal under Current Temperatures, air pressure；And measure the completed wave of nth harmonic signal under Current Temperatures, air pressure
Shape, and through lock-in amplifier and data processing, obtain nth harmonic signal under Current Temperatures, air pressure；Subsequently into step E；
Step E. obtains the background signal of 1 rd harmonic signal and 1 rd harmonic signal under Current Temperatures under Current Temperatures, air pressure
Between phasor difference, absorb coherent signal as corresponding to 1 rd harmonic signal under Current Temperatures, air pressure；Meanwhile obtain current temperature
Degree, the phasor difference under air pressure under nth harmonic signal and Current Temperatures between the background signal of nth harmonic signal, as current temperature
Coherent signal is absorbed under degree, air pressure corresponding to nth harmonic signal, subsequently into step F；
Step F. using Current Temperatures, coherent signal is absorbed under air pressure corresponding to 1 rd harmonic signal, for Current Temperatures,
Coherent signal is absorbed under air pressure corresponding to nth harmonic signal operation is normalized, update nth harmonic under Current Temperatures, air pressure
Coherent signal is absorbed corresponding to signal；Meanwhile using the background signal of 1 rd harmonic signal under Current Temperatures, for Current Temperatures
Operation is normalized in the background signal of lower nth harmonic signal, updates the background signal of nth harmonic signal under Current Temperatures；So
Enter step G afterwards；
Step G. is obtained under the corresponding absorption coherent signal of nth harmonic signal under Current Temperatures, air pressure and Current Temperatures n times
The ratio between peak value between the background signal of harmonic signal, as the signal-to-background ratio SBR of nth harmonic signal under Current Temperatures, air pressure, then
Into step H；
Step H. judges whether n is equal to M, is then to enter step I；Otherwise using the corresponding values of n with 1 and, for n progress
Renewal, and return to step D；
Step I. is the letter for obtaining 2 rd harmonic signals each harmonic signal into M rd harmonic signals under Current Temperatures, air pressure
The back of the body compares SBR；Then the harmonic signal corresponding to maximum signal-to-background ratio SBR is selected, as object gas under Current Temperatures, air pressure most
Good times harmonic signal；Subsequently into step J；
Whether the air pressure in the pipeline of step J. judgement samples pond, which is equal to, is arrived preset pressure upper limit threshold, is then to enter step K；
Otherwise by adjusting the injection rate for the protective gas not blended to the injection of sample cell pipeline with laser, control in sample cell pipeline
Air pressure, based on current gas pressure, increase preset pressure increment size, update the current gas pressure in sample cell pipeline, and set
Parameter n=2, it is then back to step D；
Whether the temperature in the pipeline of step K. judgement samples pond is equal to preset temperature upper limit threshold, is to obtain not equality of temperature
The optimal times harmonic signal of object gas under degree, air pressure environment；Otherwise by the heating in sample cell pipeline, controlling sample
Temperature in the pipeline of pond, based on Current Temperatures, increase preset temperature increment size, update the current temperature in sample cell pipeline
Degree, and return to step B.
As a preferred technical solution of the present invention：For the laser through before the sample cell pipeline, laser is first
First pass through the protective gas not blended with laser to be purged, be then then passed through sample cell pipeline.
As a preferred technical solution of the present invention：Each harmonic signal integrity waveform in the step D, it is based on pre-
In the case of if frequency sine wave carries out optimal modulated amplitude for the laser Injection Current, measure each harmonic letter of acquisition
Number complete waveform.
As a preferred technical solution of the present invention：In the step D, continuously changed using GPIB cards in laser
Heart temperature so that the centre wavelength consecutive variations of laser, the complete waveform of each harmonic signal is obtained with this.
As a preferred technical solution of the present invention：In the step C, to sample cell pipeline inject object gas, with
And do not blended with laser protective gas while, record target gas levels, as object gas actual concentrations；
In the step F, after absorbing coherent signal corresponding to nth harmonic signal under renewal Current Temperatures, air pressure, obtain
The object gas measure concentration that the absorption correlation signal peaks are finally inversed by is right as nth harmonic signal institute under Current Temperatures, air pressure
Answer object gas measure concentration, and obtain the object gas measure concentration and object gas actual concentrations between difference it is absolute
Value, as the target gas levels detection error corresponding to nth harmonic signal under Current Temperatures, air pressure；
In the step I, for 2 rd harmonic signals under obtained Current Temperatures, air pressure into M rd harmonic signals each harmonic
The signal-to-background ratio SBR of signal, is ranked up by order from large to small, and by first signal-to-background ratio SBR, sequentially select [(M-
1) G] individual signal-to-background ratio SBR, as each signal-to-background ratio SBR to be selected；Then it is directed to corresponding to each signal-to-background ratio SBR difference to be selected
Harmonic signal, the harmonic signal corresponding to minimum target gas concentration detection error is selected, as target under Current Temperatures, air pressure
The optimal times harmonic signal of gas, subsequently into step J, wherein, G is preset percentage numerical value, 0 ＜ G ＜ 50%.
The application process of the optimal times harmonic signal measurement apparatus of a kind of object gas of the present invention, using above technology
Scheme compared with prior art, has following technique effect：The optimal times harmonic signal of a kind of object gas that the present invention designs
The application process of measurement apparatus, based on the optimal times harmonic signal measurement apparatus of object gas of brand new design, using sharp
Light technology, accurately realize under various different temperatures, pressure, the measurement of the optimal times harmonic signal of object gas, and significantly
Improve measurement operating efficiency.
Brief description of the drawings
Fig. 1 is a kind of schematic diagram of the optimal times harmonic signal measurement apparatus of object gas designed by the present invention.
Wherein, 1. function signal generators, 2. adders, 3. laser controllers, 4. lasers, 6. collimation lenses, 7. samples
Product pond pipeline, 8. heating plants, 10. temperature measuring equipments, 11. signal sensors, 15. data processing and control terminals, 16. purifications
Device.
Embodiment
The embodiment of the present invention is described in further detail with reference to Figure of description.
As shown in figure 1, the present invention devises a kind of optimal times harmonic signal measurement apparatus of object gas, practical application is worked as
In, specifically include function signal generator 1, adder 2, laser controller 3, DFB semiconductor laser, collimation lens 6, sample
Pond pipeline 7, heating plant 8, thermocouple, signal sensor 11, data processing and control terminal 15 and purifier 16；Wherein, number
It is connected according to processing control terminal 15 and function signal generator 1 and carries out signal interaction；The output end of function signal generator 1 is with adding
The input of musical instruments used in a Buddhist or Taoist mass 2 is connected；The output end of adder 2 is connected with the input of laser controller 3, laser controller 3 it is defeated
Go out end with the control terminal of DFB semiconductor laser to be connected, dfb semiconductor is directed to according to received data by laser controller 3
Laser is controlled；The output end of DFB semiconductor laser points to one end of collimation lens 6；Distinguish at the both ends of sample cell pipeline 7
Laser light incident end and laser ejecting end are set, laser light incident end and the laser ejecting end of sample cell pipeline 7 open wide respectively, and each other
It is connected, and the center line of connected region is straight line between the inner laser incidence end of sample cell pipeline 7 and laser ejecting end；Sample
The laser light incident end of product pond pipeline 7 and laser ejecting end difference sealed set high reflectance lens, and two high reflectance lens
Primary optical axis it is co-linear with one another；Oppositely facing the other end of DFB semiconductor laser and the laser of purifier 16 on collimation lens 6
Incidence end is relative to be connect, the high reflectance lens at laser light incident end on the laser ejecting end docking sample cell pipeline 7 of purifier 16,
The center line of the center line at laser light incident end and laser ejecting end is co-linear with one another on purifier 16, is filled not in purifier 16
The protective gas blended with laser；High reflectance lens directional signal detector 11 on the laser ejecting end of sample cell pipeline 7
Signal receiving end, the output end of signal sensor 11 is connected with the input of data processing and control terminal 15；Sample cell pipeline 7
Outer surface is sealing structure, and the surface of sample cell pipeline 7 sets object gas input channel and object gas output channel, connects sample
The interior or exterior space of product pond pipeline 7, and valve is set respectively on object gas input channel and object gas output channel；Sample
The surface of pond pipeline 7 also sets up pressure control pipeline, the interior or exterior space of connection sample cell pipeline 7, and is set on pressure control pipeline
Valve is put, by the input of pressure control pipeline, exports the protective gas not blended with laser to adjust in sample cell pipeline 7
Air pressure change；Heating plant 8 is located at outside sample cell pipeline 7, for being heated for sample cell pipeline 7；Thermocouple is located at
Outside sample cell pipeline 7, and the measurement end of thermocouple passes through the surface of sample cell pipeline 7, inside sample cell pipeline 7, is used for
Detect the internal temperature of sample cell pipeline 7.In practical application, wherein, the protective gas not blended with laser, it is designed specifically to height
Pure N2。
Based on the optimal times harmonic signal measurement apparatus of above-mentioned designed object gas, specific design of the present invention target
The application process of the optimal times harmonic signal measurement apparatus of gas, for obtaining object gas under different temperatures, air pressure environment
Optimal times harmonic signal；Laser is purged by the protective gas not blended with laser first, is then then passed through sample
Pond pipeline 7, wherein for the laser through the sample cell pipeline 7, specifically measure as follows：
Step A. using room temperature as sample cell pipeline 7 in Current Temperatures, and enter step B.
Step B. carries out vacuumize process for sample cell pipeline 7, measures vacuum sample pond pipeline 7 under Current Temperatures and distinguishes
The background signal of corresponding each harmonic signal, subsequently into step C；Wherein, each harmonic signal is 1 rd harmonic signal to M times
The each harmonic signal of harmonic signal, M are to preset maximum rd harmonic signal.
Step C. injects object gas and the protective gas not blended with laser to sample cell pipeline 7, meanwhile, note
Target gas levels are recorded, as object gas actual concentrations, and by adjusting the injection for the protective gas not blended with laser
Amount, it is default initial gas pressure value to control air pressure in sample cell pipeline 7, as the current gas pressure in sample cell pipeline 7, and is initialized
Parameter n=2, subsequently into step D.
In the case of step D. is based on predeterminated frequency sine wave for the optimal modulated amplitude of laser Injection Current progress,
Continuously change the central temperature of laser using GPIB cards so that the centre wavelength consecutive variations of laser, measured currently with this
The complete waveform of 1 rd harmonic signal under temperature, air pressure, and through lock-in amplifier and data processing, obtain under Current Temperatures, air pressure
1 rd harmonic signal；And the complete waveform of nth harmonic signal under Current Temperatures, air pressure is measured, and through lock-in amplifier and data
Processing, obtain nth harmonic signal under Current Temperatures, air pressure；Subsequently into step E.
In step D, continuously change the central temperature of laser using GPIB cards so that the centre wavelength of laser continuously becomes
Change, the complete waveform of each harmonic signal is obtained with this.
Step E. obtains the background signal of 1 rd harmonic signal and 1 rd harmonic signal under Current Temperatures under Current Temperatures, air pressure
Between phasor difference, absorb coherent signal as corresponding to 1 rd harmonic signal under Current Temperatures, air pressure；Meanwhile obtain current temperature
Degree, the phasor difference under air pressure under nth harmonic signal and Current Temperatures between the background signal of nth harmonic signal, as current temperature
Coherent signal is absorbed under degree, air pressure corresponding to nth harmonic signal, subsequently into step F.
Step F. using Current Temperatures, coherent signal is absorbed under air pressure corresponding to 1 rd harmonic signal, for Current Temperatures,
Coherent signal is absorbed under air pressure corresponding to nth harmonic signal operation is normalized, update nth harmonic under Current Temperatures, air pressure
Coherent signal is absorbed corresponding to signal, the object gas measure concentration that the absorption correlation signal peaks are finally inversed by then is obtained, makees
Concentration is determined for the object gas corresponding to nth harmonic signal under Current Temperatures, air pressure, and obtains object gas measure concentration
The absolute value of difference between object gas actual concentrations, as the target corresponding to nth harmonic signal under Current Temperatures, air pressure
Gas concentration detection error；Meanwhile using the background signal of 1 rd harmonic signal under Current Temperatures, it is humorous for n times under Current Temperatures
Operation is normalized in the background signal of ripple signal, updates the background signal of nth harmonic signal under Current Temperatures；Subsequently into step
Rapid G.
Step G. is obtained under the corresponding absorption coherent signal of nth harmonic signal under Current Temperatures, air pressure and Current Temperatures n times
The ratio between peak value between the background signal of harmonic signal, as the signal-to-background ratio SBR of nth harmonic signal under Current Temperatures, air pressure, then
Into step H.
Step H. judges whether n is equal to M, is then to enter step I；Otherwise using the corresponding values of n with 1 and, for n progress
Renewal, and return to step D.
Step I. is the letter for obtaining 2 rd harmonic signals each harmonic signal into M rd harmonic signals under Current Temperatures, air pressure
The back of the body compares SBR；For the signal-to-background ratio of 2 rd harmonic signals each harmonic signal into M rd harmonic signals under obtained Current Temperatures, air pressure
SBR, be ranked up by order from large to small, and by first signal-to-background ratio SBR, sequentially select [(M-1) G] it is individual letter the back of the body
Than SBR, as each signal-to-background ratio SBR to be selected；Then for the corresponding harmonic signal of each signal-to-background ratio SBR difference to be selected, choosing
Select the harmonic signal corresponding to minimum target gas concentration detection error, as under Current Temperatures, air pressure object gas it is optimal
Times harmonic signal, subsequently into step J, wherein, G is preset percentage numerical value, 0 ＜ G ＜ 50%.
Whether the air pressure in step J. judgement samples pond pipeline 7, which is equal to, is arrived preset pressure upper limit threshold, is then to enter step
K；Otherwise the injection rate for the protective gas not blended with laser is injected to sample cell pipeline 7 by adjusting, controls sample cell pipe
Air pressure in road 7, based on current gas pressure, increase preset pressure increment size, update the current gas pressure in sample cell pipeline 7,
And setup parameter n=2, it is then back to step D.Wherein, in practical application, for preset pressure increment size, specific design uses
1atm。
Whether the temperature in step K. judgement samples pond pipeline 7 is equal to preset temperature upper limit threshold, is to obtain not equality of temperature
The optimal times harmonic signal of object gas under degree, air pressure environment；Otherwise by the heating in sample cell pipeline 7, controlling sample
Temperature in product pond pipeline 7, based on Current Temperatures, increase preset temperature increment size, update current in sample cell pipeline 7
Temperature, and return to step B.Wherein, in practical application, for preset temperature increment size, specific design uses 100 DEG C.
Based on the optimal times harmonic signal measurement apparatus of above-mentioned designed object gas and application process, based on brand new
The optimal times harmonic signal measurement apparatus of object gas of design, using laser technology, accurately realizes various different temperatures, pressure
Under strong, the measurement of the optimal times harmonic signal of object gas, and substantially increase measurement operating efficiency.
Embodiments of the present invention are explained in detail above in conjunction with accompanying drawing, but the present invention is not limited to above-mentioned implementation
Mode, can also be on the premise of present inventive concept not be departed from those of ordinary skill in the art's possessed knowledge
Make various variations.
Claims (10)
- A kind of 1. optimal times harmonic signal measurement apparatus of object gas, it is characterised in that：Including function signal generator (1), Adder (2), laser controller (3), laser (4), collimation lens (6), sample cell pipeline (7), heating plant (8), temperature Measurement apparatus (10), signal sensor (11) and data processing and control terminal (15)；Wherein, data processing and control terminal (15) with Function signal generator (1), which is connected, carries out signal interaction；The output end of function signal generator (1) and the input of adder (2) End is connected；The output end of adder (2) is connected with the input of laser controller (3), the output end of laser controller (3) with The control terminal of laser (4) is connected, and is controlled by laser controller (3) according to received data for laser (4)；Swash The output end of light device (4) points to one end of collimation lens (6)；Sample cell pipeline (7) both ends set laser light incident end with swashing respectively Light ejecting end, laser light incident end and the laser ejecting end of sample cell pipeline (7) open wide respectively, and it is logical to be connected with each other, and sample The center line of connected region is straight line between pond pipeline (7) inner laser incidence end and laser ejecting end；Sample cell pipeline (7) Laser light incident end and laser ejecting end difference sealed set high reflectance lens, and the primary optical axis of two high reflectance lens is each other Collinearly；The other end of collimation lens (6) points to the high reflectance lens on sample cell pipeline (7) laser light incident end, sample cell pipe The signal receiving end of high reflectance lens directional signal detector (11) on road (7) laser ejecting end, signal sensor (11) Output end be connected with data processing and control terminal (15) input；Sample cell pipeline (7) outer surface is sealing structure, sample Pond pipeline (7) surface sets object gas input channel and object gas output channel, connects sample cell pipeline (7) interior outer space Between, and valve is set respectively on object gas input channel and object gas output channel；Sample cell pipeline (7) surface is also Pressure control pipeline is set, connects sample cell pipeline (7) interior or exterior space, and valve is set on pressure control pipeline, is passed through Pressure control pipeline input, the protective gas that is not blended with laser of output adjust the air pressure change in sample cell pipeline (7)； Heating plant (8) is located at sample cell pipeline (7) outside, for being heated for sample cell pipeline (7)；Temperature measuring equipment (10) it is outside positioned at sample cell pipeline (7), and the measurement end of temperature measuring equipment (10) passes through sample cell pipeline (7) surface, position It is internal in sample cell pipeline (7), for detecting sample cell pipeline (7) internal temperature.
- A kind of 2. optimal times harmonic signal measurement apparatus of object gas according to claim 1, it is characterised in that：Also include Purifier (16), the laser on the collimation lens (6) oppositely facing the other end and purifier (16) of laser (4) enter Penetrate end to connect relatively, the high reflectance at laser light incident end is saturating on the laser ejecting end docking sample cell pipeline (7) of purifier (16) Mirror, the center line of the center line and laser ejecting end at laser light incident end is co-linear with one another on purifier (16), purifier (16) It is middle to fill the protective gas not blended with laser.
- A kind of 3. optimal times harmonic signal measurement apparatus of object gas according to claim 1 or claim 2, it is characterised in that：Institute It is high-purity N to state the protective gas not blended with laser2。
- A kind of 4. optimal times harmonic signal measurement apparatus of object gas according to claim 1 or claim 2, it is characterised in that：Institute It is thermocouple to state temperature measuring equipment (10).
- A kind of 5. optimal times harmonic signal measurement apparatus of object gas according to claim 1 or claim 2, it is characterised in that：Institute It is DFB semiconductor laser to state laser (4).
- A kind of 6. application process based on the optimal times harmonic signal measurement apparatus of object gas described in claim 2, for obtaining Obtain the optimal times harmonic signal of object gas under different temperatures, air pressure environment；Characterized in that, it is directed to through the sample cell The laser of pipeline (7), is measured as follows：Step A. using room temperature as sample cell pipeline (7) in Current Temperatures, and enter step B；Step B. carries out vacuumize process for sample cell pipeline (7), measures vacuum sample pond pipeline (7) difference under Current Temperatures The background signal of corresponding each harmonic signal, subsequently into step C；Wherein, each harmonic signal is 1 rd harmonic signal to M times The each harmonic signal of harmonic signal, M are to preset maximum rd harmonic signal；Step C. injects object gas and the protective gas not blended with laser to sample cell pipeline (7), and passes through regulation The injection rate for the protective gas not blended with laser, it is default initial gas pressure value to control air pressure in sample cell pipeline (7), as Current gas pressure in sample cell pipeline (7), and initiation parameter n=2, subsequently into step D；Step D. measurements Current Temperatures, under air pressure 1 rd harmonic signal complete waveform, and through lock-in amplifier and data processing, Obtain 1 rd harmonic signal under Current Temperatures, air pressure；And the complete waveform of nth harmonic signal under Current Temperatures, air pressure is measured, And through lock-in amplifier and data processing, obtain nth harmonic signal under Current Temperatures, air pressure；Subsequently into step E；Step E. obtains Current Temperatures, under air pressure under 1 rd harmonic signal and Current Temperatures between the background signal of 1 rd harmonic signal Phasor difference, absorb coherent signal as corresponding to 1 rd harmonic signal under Current Temperatures, air pressure；Meanwhile acquisition Current Temperatures, Phasor difference under air pressure under nth harmonic signal and Current Temperatures between the background signal of nth harmonic signal, as Current Temperatures, Coherent signal is absorbed under air pressure corresponding to nth harmonic signal, subsequently into step F；Step F. absorbs coherent signal using corresponding to 1 rd harmonic signal under Current Temperatures, air pressure, for Current Temperatures, air pressure Coherent signal is absorbed corresponding to lower nth harmonic signal operation is normalized, update nth harmonic signal under Current Temperatures, air pressure Corresponding absorption coherent signal；Meanwhile using the background signal of 1 rd harmonic signal under Current Temperatures, for n times under Current Temperatures Operation is normalized in the background signal of harmonic signal, updates the background signal of nth harmonic signal under Current Temperatures；Subsequently into Step G；Step G. obtains nth harmonic under the corresponding absorption coherent signal of nth harmonic signal under Current Temperatures, air pressure and Current Temperatures The ratio between peak value between the background signal of signal, as the signal-to-background ratio SBR of nth harmonic signal under Current Temperatures, air pressure, subsequently into Step H；Step H. judges whether n is equal to M, is then to enter step I；Otherwise using the corresponding values of n with 1 and, for n progress more Newly, and return to step D；Step I. is the signal-to-background ratio for obtaining 2 rd harmonic signals each harmonic signal into M rd harmonic signals under Current Temperatures, air pressure SBR；Then the harmonic signal corresponding to maximum signal-to-background ratio SBR is selected, optimal time as object gas under Current Temperatures, air pressure Number harmonic signal；Subsequently into step J；Whether the air pressure in step J. judgement samples pond pipeline (7), which is equal to, is arrived preset pressure upper limit threshold, is then to enter step K； Otherwise by adjusting the injection rate for the protective gas not blended to sample cell pipeline (7) injection with laser, sample cell pipe is controlled Air pressure in road (7), based on current gas pressure, increase preset pressure increment size, update the current gas in sample cell pipeline (7) Pressure, and setup parameter n=2, are then back to step D；Whether the temperature in step K. judgement samples pond pipeline (7) is equal to preset temperature upper limit threshold, be then obtain different temperatures, The optimal times harmonic signal of object gas under air pressure environment；Otherwise by the heating in sample cell pipeline (7), controlling sample Temperature in pond pipeline (7), based on Current Temperatures, increase preset temperature increment size, update working as in sample cell pipeline (7) Preceding temperature, and return to step B.
- 7. a kind of application process based on the optimal times harmonic signal measurement apparatus of object gas according to claim 6, its It is characterised by：The laser is through before the sample cell pipeline (7), protection of the laser first by not blended with laser Gas is purged, and is then then passed through sample cell pipeline (7).
- 8. a kind of application process based on the optimal times harmonic signal measurement apparatus of object gas according to claim 6, its It is characterised by：Each harmonic signal integrity waveform in the step D, it is to be noted based on predeterminated frequency sine wave for the laser In the case of entering the optimal modulated amplitude of electric current progress, each harmonic signal integrity waveform of acquisition is measured.
- 9. a kind of application process based on the optimal times harmonic signal measurement apparatus of object gas according to claim 6, its It is characterised by：In the step D, continuously change the central temperature of laser using GPIB cards so that the centre wavelength of laser Consecutive variations, the complete waveform of each harmonic signal is obtained with this.
- 10. a kind of application process based on the optimal times harmonic signal measurement apparatus of object gas according to claim 6, its It is characterised by：In the step C, object gas and the protective gas not blended with laser are injected to sample cell pipeline (7) While, target gas levels are recorded, as object gas actual concentrations；In the step F, after absorbing coherent signal corresponding to nth harmonic signal under renewal Current Temperatures, air pressure, the suction is obtained The object gas measure concentration that correlation signal peaks are finally inversed by is received, as corresponding to nth harmonic signal under Current Temperatures, air pressure Object gas determines concentration, and obtains the absolute value of difference between object gas measure concentration and object gas actual concentrations, As the target gas levels detection error corresponding to nth harmonic signal under Current Temperatures, air pressure；In the step I, for 2 rd harmonic signals under obtained Current Temperatures, air pressure into M rd harmonic signals each harmonic signal Signal-to-background ratio SBR, be ranked up by order from large to small, and by first signal-to-background ratio SBR, sequentially select [(M-1) G] individual signal-to-background ratio SBR, as each signal-to-background ratio SBR to be selected；Then for the corresponding harmonic wave of each signal-to-background ratio SBR difference to be selected Signal, the harmonic signal corresponding to minimum target gas concentration detection error is selected, as object gas under Current Temperatures, air pressure Optimal times harmonic signal, subsequently into step J, wherein, G is preset percentage numerical value, 0 ＜ G ＜ 50%.
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| CN101915737A (en) * | 2010-08-03 | 2010-12-15 | 武汉科技大学 | Detection instrument for detecting concentration of CO gas |
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| CN103868885A (en) * | 2014-03-27 | 2014-06-18 | 清华大学 | Composite multi-harmonic-based online gas concentration measurement method |
| CN105388120A (en) * | 2015-11-25 | 2016-03-09 | 山西大学 | WMRF new model-based calibration-free wavelength modulation spectrum gas detection method |
| CN207280930U (en) * | 2017-08-15 | 2018-04-27 | 江苏师范大学 | A kind of optimal times harmonic signal measurement apparatus of object gas |
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| CN101915737A (en) * | 2010-08-03 | 2010-12-15 | 武汉科技大学 | Detection instrument for detecting concentration of CO gas |
| CN103323115A (en) * | 2013-06-24 | 2013-09-25 | 清华大学 | Method for measuring gas absorption spectrum line width and line-type coefficient based on wavelength modulation |
| CN103868885A (en) * | 2014-03-27 | 2014-06-18 | 清华大学 | Composite multi-harmonic-based online gas concentration measurement method |
| CN105388120A (en) * | 2015-11-25 | 2016-03-09 | 山西大学 | WMRF new model-based calibration-free wavelength modulation spectrum gas detection method |
| CN207280930U (en) * | 2017-08-15 | 2018-04-27 | 江苏师范大学 | A kind of optimal times harmonic signal measurement apparatus of object gas |
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