CN110441241A - A kind of device for evaluating performance and method of optoacoustic spectroscopy Multi-Component Gas Analyzing instrument - Google Patents
A kind of device for evaluating performance and method of optoacoustic spectroscopy Multi-Component Gas Analyzing instrument Download PDFInfo
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Abstract
It include: sound proof box, high pure nitrogen transportation system, under test gas transportation system, salting liquid container and gas mixer chamber the present invention provides a kind of device for evaluating performance of optoacoustic spectroscopy Multi-Component Gas Analyzing instrument and method, ambient noise simulator and photo-acoustic spectrometer to be evaluated are provided in sound proof box, the air inlet of the photo-acoustic spectrometer to be evaluated and the outlet of the gas mixer chamber, to detect the concentration of the gas into the gas mixer chamber.The present invention is simulated under real operating environments by ambient noise simulator, influence of the noise to measurement result, to be conducive to evaluate the ability of the tenable environment noise jamming of photo-acoustic spectrometer；The test gas of different kinds and concentrations can also be replaced simultaneously, in conjunction with specific signal processing method, the test for realizing gas cross sensibility and detectable limit carries out accurate, efficient, reliable performance evaluation by the key technical index to photo-acoustic spectrometer to be evaluated.
Description
Technical field
The present invention relates to high-voltage technologies and gas detection technology field, in particular to a kind of optoacoustic spectroscopy multiple groups
Divide the device for evaluating performance and method of gas analysis instrument.
Background technique
The development of national grid is using bulk power grid safety and constructs efficient, safe, strong smart grid as important construction
Target.With the high speed development of extra-high voltage interconnected network, newly-built substation and the Bulk Supply Substation newly put into are every year with 7% -10%
Speed increase.Traction by the development of State Grid's system high-speed and to transformer online monitoring device requirement, novel transformer
Dissolved gas analysis (DGA) on-line monitoring technique is fast-developing, monitors skill on-line with advanced optoacoustic spectroscopy transformer DGA
Art replaces gas-chromatography on-line monitoring technique to have become the universal common recognition of electric system.Optoacoustic spectroscopy DGA method is in recent years in electricity
Force system high-power transformer on-line monitoring field has been more and more widely used, the product in different technologies source and manufacturer
There are different technical characterstic and site environment adaptability, carries out accurately evaluation point for the basic mechanical design feature to such product
Grade, needs to establish the testing process and scheme of a set of high efficient and reliable.Optoacoustic spectroscopy Multi-Component Gas Analyzing instrument is to ambient noise
Sensitivity directly affect the actually detected sensitivity limit index and anti-interference ability of the device；The infrared absorption light of gas
Cross jamming between spectrum is the main source of optoacoustic spectroscopy detection device gas concentration measurement error, directly affects the survey of its gas
The selection index of amount.
Summary of the invention
In consideration of it, the invention proposes a kind of device for evaluating performance of optoacoustic spectroscopy Multi-Component Gas Analyzing instrument and sides
Method, it is intended to solve to be difficult to carry out accurate evaluation to the technical performance of optoacoustic spectroscopy Multi-Component Gas Analyzing instrument in the prior art
Problem.
On one side, the invention proposes a kind of device for evaluating performance of optoacoustic spectroscopy Multi-Component Gas Analyzing instrument, comprising: every
Speaker, high pure nitrogen transportation system, under test gas transportation system, salting liquid container and gas mixer chamber；Wherein, the salt
The outlet of the import of solution container and the high pure nitrogen transportation system, the outlet of the salting liquid container with
First inlet communication of the gas mixer chamber, with so that first being flowed from the high pure nitrogen that the high pure nitrogen flow line flows out
It is entered back into the gas mixer chamber after the salting liquid in the salting liquid container；The under test gas transportation system
Second inlet communication of outlet and the gas mixer chamber；Ambient noise simulator and to be evaluated is provided in the sound proof box
The outlet of photo-acoustic spectrometer, the air inlet of the photo-acoustic spectrometer to be evaluated and the gas mixer chamber, to detect into
Enter the concentration of the gas in the gas mixer chamber；The ambient noise simulator is arranged in the photo-acoustic spectrometer to be evaluated
Side, to simulate the photo-acoustic spectrometer to be evaluated work when environmental noise.
Further, in above-mentioned device for evaluating performance, the ambient noise simulator includes: controller, signal generation
Device, loudspeaker and sound pressure meter；Wherein, the sound pressure meter is connect with the output end of the loudspeaker, to detect the loudspeaker
The acoustic pressure of the noise of output；The signal generator is connect with the input terminal of the loudspeaker, to drive the loudspeaker work
Make；The controller is all connected with the sound pressure meter and the signal generator, to the acoustic pressure obtained according to the sound pressure meter
Data control the signal generator and drive the speaker operation, so that it is default to maintain the acoustic pressure in the sound proof box
In range.
Further, in above-mentioned device for evaluating performance, further includes: interference gas transportation system；Wherein,
The outlet of the interference gas transportation system and the inlet communication of the gas mixer chamber.
In the present invention, simulated under real operating environments by ambient noise simulator, influence of the noise to measurement result,
To be conducive to evaluate the ability of the tenable environment noise jamming of photo-acoustic spectrometer；Different kinds and concentrations can also be replaced simultaneously
Test gas the test of gas cross sensibility and detectable limit is realized, by treating in conjunction with specific signal processing method
The key technical index for evaluating photo-acoustic spectrometer carries out accurate, efficient, reliable performance evaluation, can reduce wrong report to the maximum extent
Police fails to report harm and loss caused by police.
On the other hand, the invention also provides a kind of method of evaluating performance of optoacoustic spectroscopy Multi-Component Gas Analyzing instrument,
The following steps are included: closing ambient noise simulator, and the solution in salting liquid container is discharged, is passed through high pure nitrogen
Gas circuit is cleaned, then starts the gas circulation process of measurement of photo-acoustic spectrometer to be evaluated, completes 1 circulating sampling and measurement process
The background concentration test data set a1 of under test gas is recorded afterwards；The data group a1 is handled to obtain optoacoustic spectroscopy to be evaluated
Zero deviation of the instrument for every kind of gas component under test gas；Open ambient noise simulator, with default sound pressure into
Row continuous sound wave frequency scanning, and under test gas is passed through in photo-acoustic spectrometer to be evaluated and carries out repeatedly continuous measurement, record to
Survey the actual measurement concentration data group a2 of gas；According to the data group a2 and the photo-acoustic spectrometer to be evaluated for every kind of gas
The zero deviation of body component obtains photoacoustic cell noise-frequency response curve, resistance to for photo-acoustic spectrometer to be evaluated described in quantitatively characterizing
By the ability of ambient noise interference.
Further, in above-mentioned method of evaluating performance, the default sound pressure is 90-100dB.
Further, in above-mentioned method of evaluating performance, the processing step to data group a1 includes:
The background concentration data of each gas component in the under test gas recorded in the data group a1 are sought into standard deviation respectively, with institute
The actual measurement for stating 3 times of lowest detection least concentrations to corresponding gas component as the photo-acoustic spectrometer to be evaluated of standard deviation refers to
Mark, and after averaging to the actual measurement index of the lowest detection least concentration of each gas component with the difference of concentration zero point work
It is the photo-acoustic spectrometer to be evaluated for the zero deviation of this kind of gas component.
Further, in above-mentioned method of evaluating performance, further includes: through under test gas transportation system to the gas mixer chamber
In be passed through the under test gas of the first preset concentration, or led to simultaneously by high pure nitrogen transportation system into the gas mixer chamber
Enter high pure nitrogen to be diluted the under test gas, and gas under different situations is carried out by photo-acoustic spectrometer to be evaluated
Repeatedly circulation measurement, records the actual measurement concentration data group a3 of under test gas；After the data group a3 is averaged, subtract
It takes absolute value after the known concentration of the corresponding calibrating gas of under test gas, it is described to be evaluated in the case of obtaining the first preset concentration
The measurement error of photo-acoustic spectrometer.
Further, in above-mentioned method of evaluating performance, further includes: through under test gas transportation system to the gas mixer chamber
In be passed through the under test gas of the first preset concentration, it is default that second is passed through into the gas mixer chamber through interference gas transportation system
The interference gas of concentration, and after being diluted by high pure nitrogen to the interference gas, to entering photo-acoustic spectrometer to be evaluated
In gas measure, record the actual measurement concentration data group a4 of under test gas；Wherein, second preset concentration is institute
10-100 times for stating the first preset concentration；
The interference of the interference gas of the second preset concentration to the under test gas of the first preset concentration is obtained according to the data group a4
Influence degree.
Further, in above-mentioned method of evaluating performance, the under test gas is CO, CO2、CH4、C2H6、C2H4And C2H2It is mixed
Close gas.
Further, in above-mentioned method of evaluating performance, the interference gas is CO, CO2、CH4、C2H6、C2H4And C2H2In
It is one or more.
Further, in above-mentioned method of evaluating performance, further includes: be successively put into different salt in salting liquid container
Solution, so that after the high pure nitrogen of high pure nitrogen transportation system conveying flows separately through the salting liquid of the various concentration, into gas
It is mixed in body mixing chamber under test gas, repeatedly circulation measurement is carried out to the under test gas by photo-acoustic spectrometer to be evaluated,
Record the actual measurement concentration data group a5 of under test gas；The data group a5 is subtracted into the corresponding calibrating gas of under test gas
It takes absolute value after known concentration, the ability for taking wherein maximum value to characterize optoacoustic spectroscopy instrument tolerance humidity interference.
The method of evaluating performance of optoacoustic spectroscopy Multi-Component Gas Analyzing instrument provided by the invention, by obtaining under test gas
Background concentration test data set after obtain the zero deviation of photo-acoustic spectrometer, while obtaining spectrum spectrometer to every kind of gas group
Point the lowest detection limit, according to the zero of the measurement data and the photo-acoustic spectrometer to be evaluated that have in the case of Environmental Noise Influence
Point deviation obtains photoacoustic cell noise-frequency response curve, realizes the evaluation to photo-acoustic spectrometer ambient noise interference ability；And lead to
Addition interference gas is crossed, realizes to the evaluation of the gas cross sensibility of photo-acoustic spectrometer, is conducive to reduce mistake to the maximum extent
Alarm or fail to report harm and loss caused by police.
Detailed description of the invention
By reading the following detailed description of the preferred embodiment, various other advantages and benefits are common for this field
Technical staff will become clear.The drawings are only for the purpose of illustrating a preferred embodiment, and is not considered as to the present invention
Limitation.And throughout the drawings, the same reference numbers will be used to refer to the same parts.In the accompanying drawings:
Fig. 1 is the structural representation of the device for evaluating performance of optoacoustic spectroscopy Multi-Component Gas Analyzing instrument provided in an embodiment of the present invention
Figure；
Fig. 2 is the flow chart of the method for evaluating performance of optoacoustic spectroscopy Multi-Component Gas Analyzing instrument provided in an embodiment of the present invention.
Specific embodiment
Exemplary embodiments of the present disclosure are described in more detail below with reference to accompanying drawings.Although showing the disclosure in attached drawing
Exemplary embodiment, it being understood, however, that may be realized in various forms the disclosure without should be by embodiments set forth here
It is limited.On the contrary, these embodiments are provided to facilitate a more thoroughly understanding of the present invention, and can be by the scope of the present disclosure
It is fully disclosed to those skilled in the art.It should be noted that in the absence of conflict, embodiment in the present invention and
Feature in embodiment can be combined with each other.The present invention will be described in detail below with reference to the accompanying drawings and embodiments.
Installation practice:
Refering to fig. 1, the device for evaluating performance of the optoacoustic spectroscopy Multi-Component Gas Analyzing instrument of the embodiment of the present invention includes: sound proof box
1, high pure nitrogen transportation system 6, under test gas transportation system 7, salting liquid container 4 and gas mixer chamber 3；Wherein, described
The outlet of the import of salting liquid container 4 and the high pure nitrogen transportation system 6, the salting liquid container 4
First inlet communication of outlet and the gas mixer chamber 3, with so that being flowed out from the high pure nitrogen flow line 6 high-purity
Nitrogen enters back into the gas mixer chamber 3 after first flowing through the salting liquid in the salting liquid container 4；The under test gas
The outlet of transportation system 7 and the second inlet communication of the gas mixer chamber 3；Ambient noise mould is provided in the sound proof box 1
Quasi- device and photo-acoustic spectrometer (not shown) to be evaluated, the air inlet and the gas of the photo-acoustic spectrometer to be evaluated are mixed
The outlet for closing room 3, to detect the concentration of the gas into the gas mixer chamber 3；The ambient noise simulation dress
It installs in the side of the photo-acoustic spectrometer to be evaluated, makes an uproar to environment when simulating the photo-acoustic spectrometer to be evaluated work
Sound.
Specifically, high pure nitrogen transportation system 6 can be by high pure nitrogen flow controller 62 and 61 groups of High Purity Nitrogen gas cylinder
At passing through the flow of high pure nitrogen in the adjustable High Purity Nitrogen gas cylinder 61 of high pure nitrogen flow controller 62.High Purity Nitrogen gas cylinder 61
The purity of middle high pure nitrogen is not less than 99.999%.
In the present embodiment, under test gas can be the mixed gas in transformer oil to be measured, can also by calibrating gas Lai
Simulation.In order to easy to operate, under test gas is simulated by calibrating gas.Under test gas transportation system 7 can be by calibrating gas bottle group
71 and Standard Gases flow controller 72 form, pass through Standard Gases flow controller 72 control 71 Plays gas of calibrating gas bottle group stream
Amount.Calibrating gas bottle group 71 can be by CO, CO of various concentration2、CH4、C2H6、C2H4、C2H2Mix, and employ nitrogen as
Background gas.
High pure nitrogen is passed into be measured in sound proof box 1 by air inlet pipe 2 after mixing in gas mixer chamber 3 with Standard Gases
In optoacoustic spectroscopy instrument.
Solution 5 in salting liquid container 4 can be for by the saturated salt solution of the configurations such as sodium chloride, magnesium chloride, configuration
Solution there is different saturated vapor pressures, the corresponding fixed humidity value of the saturated solution of every kind of salt, using variety classes
Salt can form a series of humidity point (such as the salting liquid that humidity is respectively 15%, 30%, 50% and 80% can be prepared),
To detect the concentration data of under test gas under different humidity values.
The ambient noise simulator includes: controller (not shown), signal generator 10,11 harmony of loudspeaker
Pressure meter 12；Wherein, the sound pressure meter 12 is connect with the output end of the loudspeaker 11, to detect the output of loudspeaker 11
The acoustic pressure of noise；The signal generator 10 is connect with the input terminal of the loudspeaker 11, to drive 11 work of loudspeaker
Make；The controller is all connected with the sound pressure meter 12 and the signal generator 10, to be obtained according to the sound pressure meter 12
Acoustic pressure data, control the signal generator 10 and the loudspeaker 11 driven to work, to make the acoustic pressure in the sound proof box 1
It maintains within a preset range.
Loudspeaker 11 can be the loudspeaker with preferable low frequency response characteristic, at a distance from photo-acoustic spectrometer to be evaluated
It may remain in 1m or so.The minimum response frequency of sound pressure meter 12 is less than 20Hz.Sound pressure meter 12 measures acoustic pressure, controller
The acoustic pressure in sound proof box 1 is set to maintain 50dB or so according to sound pressure measurement result adjustment signal generator 10.
It can also include: interference gas transportation system (not shown) in the present embodiment；Wherein, the interference gas
The outlet of transportation system and the inlet communication of the gas mixer chamber 3.
Specifically, being CO, CO under test gas2、CH4、C2H6、C2H4And C2H2Gaseous mixture in the case where, interference gas
It can be CO, CO2、CH4、C2H6、C2H4And C2H2One of or it is a variety of, and the concentration order of magnitude of interference gas be higher than to
The concentration order of magnitude of gas is surveyed, more accurately to evaluate influence of the interference gas to the measurement result of under test gas.
It is above-mentioned obviously it can be concluded that, the performance evaluation of the optoacoustic spectroscopy Multi-Component Gas Analyzing instrument provided in the present embodiment
Device is simulated under real operating environments, influence of the noise to measurement result, to be conducive to comment by ambient noise simulator
The ability of the tenable environment noise jamming of valence photo-acoustic spectrometer；The test gas of different kinds and concentrations can also be replaced simultaneously,
In conjunction with specific signal processing method, the test of gas cross sensibility and detectable limit is realized, by optoacoustic light to be evaluated
The key technical index of spectrometer carries out accurate, efficient, reliable performance evaluation, can reduce to the maximum extent false alarm or fail to report
Harm and loss caused by police.
Embodiment of the method:
Referring to fig. 2, the invention also provides a kind of method of evaluating performance of optoacoustic spectroscopy Multi-Component Gas Analyzing instrument, including with
Lower step:
Step S1 closes ambient noise simulator, and the solution in salting liquid container is discharged, and it is clear to be passed through high pure nitrogen
Then gas washing road starts the gas circulation process of measurement of photo-acoustic spectrometer to be evaluated, after completing 1 circulating sampling and measurement process
Record the background concentration test data set a1 of under test gas；The data group a1 is handled to obtain photo-acoustic spectrometer to be evaluated
For the zero deviation of every kind of gas component under test gas.
After opening power supply, ambient noise simulator can be automatically turned on, therefore, before carrying out background concentration measurement,
It needs first to close ambient noise simulator.Need to exclude the influence of humidity factor simultaneously, it is also desirable to by salting liquid container
In solution discharge.The background of under test gas can be carried out with the flow velocity cleaning gas circuit of 1L/min after ten minutes by being passed through high pure nitrogen
Concentration determination.
More specifically, to the processing step of data group a1 include: in the under test gas that will be recorded in the data group a1 it is each
The background concentration data of gas component seek standard deviation respectively, using 3 times of the standard deviation as the photo-acoustic spectrometer to be evaluated
To the actual measurement index of the lowest detection least concentration of corresponding gas component, and it is dense to the lowest detection lower limit of each gas component
The actual measurement index of degree average after with the concentration zero point of photo-acoustic spectrometer to be evaluated (when no gas is passed through photo-acoustic spectrometer
The concentration value measured) difference as the photo-acoustic spectrometer to be evaluated for the zero deviation of this kind of gas component.
Step S2 opens ambient noise simulator, carries out continuous sound wave frequency scanning with default sound pressure, and will be to
It surveys gas and is passed through progress repeatedly continuous measurement in photo-acoustic spectrometer to be evaluated, record the actual measurement concentration data group of under test gas
a2.Default sound pressure is 90-100dB, such as 94 dB.Continuous sound wave frequency sweeping ranges can be 20-500Hz, scanning speed
Degree is limited in 10Hz/min or less.The period that photo-acoustic spectrometer to be evaluated continuously measures under test gas can be less than 10s,
Primary test is completed in namely every 10s.
Step S3, it is inclined for the zero point of every kind of gas component according to the data group a2 and the photo-acoustic spectrometer to be evaluated
Difference obtains photoacoustic cell noise-frequency response curve, for photo-acoustic spectrometer tenable environment noise jamming to be evaluated described in quantitatively characterizing
Ability.
Specifically, the concentration data of every kind of gas in data group a2 is subtracted photo-acoustic spectrometer to be evaluated for this kind of gas
Photoacoustic cell noise-frequency response curve is made after the zero deviation of body, obtains the noise equivalent concentration at biggest impact frequency, table
It is shown as NEC=(x) ppm/Pa(@xHz), NEC indicates the relationship letter of the concentration of every kind of gas component and noise frequency under test gas
Number, x indicate that the concentration value of the gas component measured ,@xHz indicate that frequency of sound wave is at xHz.Noise etc. at biggest impact frequency
It imitates concentration of acetylene and frequency response curve is used for the ability of the quantitatively characterizing optoacoustic spectroscopy instrument tenable environment noise jamming.
The present embodiment can with the following steps are included:
Step S4 is passed through the under test gas of the first preset concentration through under test gas transportation system into the gas mixer chamber, or
Person pass through simultaneously high pure nitrogen transportation system be passed through into the gas mixer chamber high pure nitrogen to the under test gas carry out it is dilute
It releases, and repeatedly circulation measurement is carried out to the gas under different situations by photo-acoustic spectrometer to be evaluated, record the reality of under test gas
Border measures concentration data group a3.
Specifically, the first preset concentration can be 10ppm, actual measurement is can to pass through high pure nitrogen flow control
The concentration of high pure nitrogen and Standard Gases ratio is controlled as 0:1,1:1 etc. by device and Standard Gases flow controller, and acquisition is not sympathized with
The concentration measurement data of under test gas under condition.
Step S5 subtracts the known concentration of the corresponding calibrating gas of under test gas after the data group a3 averages
After take absolute value, in the case of obtaining the first preset concentration, the measurement error of the photo-acoustic spectrometer to be evaluated.
Specifically, the concentration values of the first preset concentration are lower, it is to be evaluated in the case of low concentration can be obtained accordingly
Photo-acoustic spectrometer measurement error.
The present embodiment can with the following steps are included:
Step S6 is passed through the under test gas of the first preset concentration through under test gas transportation system into the gas mixer chamber, warp
Interference gas transportation system is passed through the interference gas of the second preset concentration into the gas mixer chamber, and passes through high pure nitrogen pair
After the interference gas is diluted, the gas entered in photo-acoustic spectrometer to be evaluated is measured, under test gas is recorded
Actual measurement concentration data group a4；Wherein, second preset concentration is 10-100 times of first preset concentration.
Specifically, under test gas is CO, CO2、CH4、C2H6、C2H4And C2H2Gaseous mixture.Interference gas is CO, CO2、
CH4、C2H6、C2H4And C2H2One of or it is a variety of.Accurate in order to obtain, reliable evaluation result, the concentration of interference gas
The order of magnitude differs larger with the concentration order of magnitude of under test gas.Such as the concentration of under test gas is 10ppm, interference gas can select
Select the CO that concentration is 100ppm, 200ppm2、CH4Gaseous mixture.Interference gas is diluted by high pure nitrogen, it is available
The interference gas of various concentration, to be conducive to obtain more fully data, so that evaluation result is more accurate and reliable.Such as it can
Cross-sensitivity test: the CO of 10ppm is carried out to the low concentration under test gas of 10ppm respectively to be successively passed through following interference gas
With the CO of 1000ppm2Normal mixture body, 10ppm C2H2With the CO of 1000ppm2Normal mixture body, 10ppm CH4
With the C of 1000ppm2H6Normal mixture body, 10ppm C2H6With the CH of 1000ppm4Normal mixture body, 10ppm
C2H4With the CH of 1000ppm4Normal mixture body, 10ppm C2H2With the C of 1000ppm2H6Normal mixture body, 10ppm
C2H2With the C of 1000ppm2H4Normal mixture body, investigate the shadow that measures low concentration under test gas of high concentration interference gas
It rings, carries out 5 groups of measurements altogether, carry out gas circuit with nitrogen before measurement every time and clean, 3 circulation measurements of every group of carry out obtain data group
a4。
Step S7 obtains the interference gas of the second preset concentration to the to be measured of the first preset concentration according to the data group a4
The interference effect degree of gas.
Specifically, the percentage shape of the ratio between the measurement error of light concentration gas and the concentration value of interference gas can be used
Formula, while interference gas type is indicated to indicate high concentration interference gas to the interference effect degree of low concentration under test gas.This
Outside, using method identical with step S5, the gas concentration measurement error under high concentration can also be obtained by a4 group data.
The present embodiment can with the following steps are included:
Step S8 is successively put into different salting liquids in salting liquid container, so that the conveying of high pure nitrogen transportation system
After high pure nitrogen flows separately through the salting liquid of the various concentration, mixed into gas mixer chamber under test gas, by
It evaluates photo-acoustic spectrometer and repeatedly circulation measurement is carried out to the under test gas, record the actual measurement concentration data group of under test gas
a5。
Specifically, the salting liquid that can choose four kinds of different saturated vapour pressures is placed in salting liquid container, it is high-purity
When nitrogen is passed through in every kind of solution, 3 circulation measurements are carried out under test gas, 12 groups of data is tested in total, obtains data group a5.
The corresponding humidity of the salting liquid prepared in the present embodiment is respectively 15%, 30%, 50% and 80%, and obtained data group a5 is as to be measured
Concentration Testing result of the every kind of gas componant in each humidity point in gas.
Step S9 takes absolute value after the data group a5 to be subtracted to the known concentration of the corresponding calibrating gas of under test gas,
The ability for taking wherein maximum value to characterize optoacoustic spectroscopy instrument tolerance humidity interference.
, can also be after step S2, step S4, step S6 be finished in the embodiment of the present invention, then execute step S3, step
Rapid S5 and step S7.Wherein, step S2, step S4, step S6 in no particular order sequence.
It should be noted that the evaluation method in the present invention is identical as the principle of evaluating apparatus, related place can be mutual
Reference.
To sum up, the method for evaluating performance of optoacoustic spectroscopy Multi-Component Gas Analyzing instrument provided by the invention, by obtain to
The zero deviation of photo-acoustic spectrometer is obtained after surveying the background concentration test data set of gas, while obtaining spectrum spectrometer to every kind
The lowest detection limit of gas component, according to the measurement data and the optoacoustic spectroscopy to be evaluated having in the case of Environmental Noise Influence
The zero deviation of instrument obtains photoacoustic cell noise-frequency response curve, and photo-acoustic spectrometer ambient noise interference ability is commented in realization
Valence；And by the way that interference gas is added, realizes to the evaluation of the gas cross sensibility of photo-acoustic spectrometer, be conducive to the maximum extent
Reduce false alarm or fails to report harm and loss caused by police.
Obviously, various changes and modifications can be made to the invention without departing from essence of the invention by those skilled in the art
Mind and range.In this way, if these modifications and changes of the present invention belongs to the range of the claims in the present invention and its equivalent technologies
Within, then the present invention is also intended to include these modifications and variations.
Claims (11)
1. a kind of device for evaluating performance of optoacoustic spectroscopy Multi-Component Gas Analyzing instrument characterized by comprising sound proof box, height
Pure nitrogen gas transportation system, under test gas transportation system, salting liquid container and gas mixer chamber；Wherein,
The outlet of the import of the salting liquid container and the high pure nitrogen transportation system, the salting liquid hold appearance
The outlet of device and the first inlet communication of the gas mixer chamber, with so that the height flowed out from the high pure nitrogen flow line
Pure nitrogen gas enters back into the gas mixer chamber after first flowing through the salting liquid in the salting liquid container；The under test gas
The outlet of transportation system and the second inlet communication of the gas mixer chamber；
Ambient noise simulator and photo-acoustic spectrometer to be evaluated, the photo-acoustic spectrometer to be evaluated are provided in the sound proof box
Air inlet and the gas mixer chamber outlet, to detect the concentration into the gas in the gas mixer chamber；
The side of the photo-acoustic spectrometer to be evaluated is arranged in the ambient noise simulator, to simulate the light to be evaluated
Environmental noise when acousto-optic spectrometer works.
2. device for evaluating performance according to claim 1, which is characterized in that the ambient noise simulator includes: control
Device, signal generator, loudspeaker and sound pressure meter processed；Wherein,
The sound pressure meter is connect with the output end of the loudspeaker, the acoustic pressure of the noise to detect the loudspeaker output；
The signal generator is connect with the input terminal of the loudspeaker, to drive the speaker operation；
The controller is all connected with the sound pressure meter and the signal generator, to the acoustic pressure obtained according to the sound pressure meter
Data control the signal generator and drive the speaker operation, so that it is default to maintain the acoustic pressure in the sound proof box
In range.
3. device for evaluating performance according to claim 1, which is characterized in that further include: interference gas transportation system；Its
In,
The outlet of the interference gas transportation system and the inlet communication of the gas mixer chamber.
4. a kind of method of evaluating performance of optoacoustic spectroscopy Multi-Component Gas Analyzing instrument, which comprises the following steps:
Ambient noise simulator is closed, and the solution in salting liquid container is discharged, is passed through high pure nitrogen cleaning gas circuit,
Then the gas circulation process of measurement for starting photo-acoustic spectrometer to be evaluated, complete after 1 circulating sampling and measurement process record to
Survey the background concentration test data set a1 of gas；To the data group a1 handled to obtain photo-acoustic spectrometer to be evaluated for
Survey the zero deviation of every kind of gas component in gas；
Ambient noise simulator is opened, continuous sound wave frequency scanning is carried out with default sound pressure, and under test gas is passed through
Continuous measurement is carried out repeatedly in photo-acoustic spectrometer to be evaluated, records the actual measurement concentration data group a2 of under test gas；
Optoacoustic is obtained for the zero deviation of every kind of gas component according to the data group a2 and the photo-acoustic spectrometer to be evaluated
Pond noise-frequency response curve, the ability for photo-acoustic spectrometer to be evaluated tenable environment noise jamming described in quantitatively characterizing.
5. method of evaluating performance according to claim 4, which is characterized in that the default sound pressure is 90-100dB.
6. method of evaluating performance according to claim 4, which is characterized in that the processing step packet to data group a1
It includes:
The background concentration data of each gas component in the under test gas recorded in the data group a1 are sought into standard deviation respectively, with institute
The actual measurement for stating 3 times of lowest detection least concentrations to corresponding gas component as the photo-acoustic spectrometer to be evaluated of standard deviation refers to
Mark, and after averaging to the actual measurement index of the lowest detection least concentration of each gas component with the optoacoustic light to be evaluated
The difference of the concentration zero point of spectrometer is as the photo-acoustic spectrometer to be evaluated for the zero deviation of this kind of gas component.
7. method of evaluating performance according to claim 4, which is characterized in that further include:
The under test gas of the first preset concentration is passed through into the gas mixer chamber through under test gas transportation system, or is led to simultaneously
It crosses high pure nitrogen transportation system and is passed through high pure nitrogen into the gas mixer chamber and the under test gas is diluted, and pass through
Photo-acoustic spectrometer to be evaluated carries out repeatedly circulation measurement to the gas under different situations, records the actual measurement concentration of under test gas
Data group a3；
After the data group a3 is averaged, take absolute value after subtracting the known concentration of the corresponding calibrating gas of under test gas,
In the case of obtaining the first preset concentration, the measurement error of the photo-acoustic spectrometer to be evaluated.
8. method of evaluating performance according to claim 7, which is characterized in that further include:
The under test gas of the first preset concentration is passed through into the gas mixer chamber through under test gas transportation system, through interference gas
Transportation system is passed through the interference gas of the second preset concentration into the gas mixer chamber, and by high pure nitrogen to the interference
After gas is diluted, the gas entered in photo-acoustic spectrometer to be evaluated is measured, the actual measurement of under test gas is recorded
Concentration data group a4；Wherein, second preset concentration is 10-100 times of first preset concentration；
The interference of the interference gas of the second preset concentration to the under test gas of the first preset concentration is obtained according to the data group a4
Influence degree.
9. method of evaluating performance according to claim 8, which is characterized in that the under test gas is CO, CO2、CH4、C2H6、
C2H4And C2H2Gaseous mixture.
10. method of evaluating performance according to claim 9, which is characterized in that the interference gas is CO, CO2、CH4、
C2H6、C2H4And C2H2One of or it is a variety of.
11. method of evaluating performance according to claim 4, which is characterized in that further include:
Different salting liquids is successively put into salting liquid container, so that the high pure nitrogen of high pure nitrogen transportation system conveying
It after the salting liquid for flowing separately through the various concentration, is mixed into gas mixer chamber under test gas, passes through optoacoustic to be evaluated
Spectrometer carries out repeatedly circulation measurement to the under test gas, records the actual measurement concentration data group a5 of under test gas；
It takes absolute value after the data group a5 to be subtracted to the known concentration of the corresponding calibrating gas of under test gas, takes wherein maximum value
Characterize the ability of optoacoustic spectroscopy instrument tolerance humidity interference.
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