CN110441241B - Performance evaluation device and method for photoacoustic spectroscopy multi-component gas analysis instrument - Google Patents
Performance evaluation device and method for photoacoustic spectroscopy multi-component gas analysis instrument Download PDFInfo
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Abstract
The invention provides a performance evaluation device and method of a photoacoustic spectroscopy multi-component gas analysis instrument, which comprises the following steps: the device comprises a sound insulation box, a high-purity nitrogen conveying system, a to-be-detected gas conveying system, a saline solution containing container and a gas mixing chamber, wherein an environmental noise simulation device and a to-be-evaluated photoacoustic spectrometer are arranged in the sound insulation box, and a gas inlet of the to-be-evaluated photoacoustic spectrometer is communicated with an outlet of the gas mixing chamber and used for detecting the concentration of gas entering the gas mixing chamber. According to the invention, the influence of noise on the measurement result under a real working environment is simulated by the environmental noise simulation device, so that the evaluation of the capability of the photoacoustic spectrometer for resisting environmental noise interference is facilitated; meanwhile, test gases with different types and concentrations can be replaced, the cross sensitivity and the detection limit of the gases are tested by combining a specific signal processing method, and the key technical indexes of the photoacoustic spectrometer to be evaluated are subjected to accurate, efficient and reliable performance evaluation.
Description
Technical Field
The invention relates to the technical field of high voltage technology and gas detection, in particular to a performance evaluation device and method of a photoacoustic spectroscopy multi-component gas analyzer.
Background
The development of national power grids takes the safety of a large power grid and the construction of an efficient, safe and strong intelligent power grid as important construction targets. With the high-speed development of the ultra-high voltage interconnected power grid, newly-built transformer stations and newly-invested main transformer stations grow at a speed of 7% -10% every year. The fast development of the Dissolved Gas Analysis (DGA) on-line monitoring technology in novel transformer oil is dragged by the high-speed development of the national power system and the demand of transformer on-line monitoring equipment, and the replacement of the gas chromatography on-line monitoring technology by the advanced photoacoustic spectroscopy transformer DGA on-line monitoring technology has become a common consensus of the power system. The photoacoustic spectroscopy DGA method is more and more widely applied in the field of online monitoring of large transformers of power systems in recent years, products from different technical sources and manufacturers have different technical characteristics and field environment adaptability, and a set of efficient and reliable test flow and scheme is required to be established for accurately evaluating and grading the main technical performance of the products. The sensitivity of the photoacoustic spectrum multi-component gas analysis instrument to environmental noise directly influences the actual detection sensitivity limit index and the anti-interference capability of the device; the cross interference between the infrared absorption spectra of gases is the main source of the gas concentration measurement error of the photoacoustic spectrum detection device, and directly influences the selectivity index of the gas measurement.
Disclosure of Invention
In view of this, the invention provides a performance evaluation device and method for a photoacoustic spectroscopy multi-component gas analysis instrument, and aims to solve the problem that the technical performance of the photoacoustic spectroscopy multi-component gas analysis instrument is difficult to accurately evaluate in the prior art.
In one aspect, the present invention provides a performance evaluation apparatus for a photoacoustic spectroscopy multi-component gas analysis instrument, including: the system comprises a sound insulation box, a high-purity nitrogen conveying system, a to-be-detected gas conveying system, a saline solution containing container and a gas mixing chamber; the inlet of the saline solution containing container is communicated with the outlet of the high-purity nitrogen conveying system, the outlet of the saline solution containing container is communicated with the first inlet of the gas mixing chamber, and therefore the high-purity nitrogen flowing out of the high-purity nitrogen flow pipeline firstly flows through the saline solution in the saline solution containing container and then enters the gas mixing chamber; an outlet of the gas conveying system to be tested is communicated with a second inlet of the gas mixing chamber; an environmental noise simulation device and a photoacoustic spectrometer to be evaluated are arranged in the sound insulation box, and a gas inlet of the photoacoustic spectrometer to be evaluated is communicated with an outlet of the gas mixing chamber and is used for detecting the concentration of gas entering the gas mixing chamber; the environment noise simulation device is arranged on one side of the photoacoustic spectrometer to be evaluated and used for simulating environment noise generated when the photoacoustic spectrometer to be evaluated works.
Further, in the above performance evaluation device, the environmental noise simulation device may include: the sound pressure measuring device comprises a controller, a signal generator, a loudspeaker and a sound pressure meter; the sound pressure meter is connected with the output end of the loudspeaker and used for detecting the sound pressure of noise output by the loudspeaker; the signal generator is connected with the input end of the loudspeaker and used for driving the loudspeaker to work; the controller is connected with the sound pressure meter and the signal generator and used for controlling the signal generator to drive the loudspeaker to work according to sound pressure data obtained by the sound pressure meter, so that the sound pressure in the soundproof box is maintained within a preset range.
Further, the performance evaluation device may further include: a disturbance gas delivery system; wherein the content of the first and second substances,
the outlet of the interfering gas delivery system is in communication with the inlet of the gas mixing chamber.
In the invention, the influence of noise on the measurement result under the real working environment is simulated by the environmental noise simulation device, so that the evaluation of the capability of the photoacoustic spectrometer for resisting environmental noise interference is facilitated; meanwhile, test gases with different types and concentrations can be replaced, the cross sensitivity and the detection limit of the gases can be tested by combining a specific signal processing method, and the damage and loss caused by false alarm or alarm omission can be reduced to the maximum extent by accurately, efficiently and reliably evaluating the key technical indexes of the photoacoustic spectrometer to be evaluated.
On the other hand, the invention also provides a performance evaluation method of the photoacoustic spectroscopy multi-component gas analysis instrument, which comprises the following steps: closing the environmental noise simulation device, discharging the solution in the saline solution containing container, introducing a high-purity nitrogen cleaning gas circuit, starting a gas circulation measurement program of the photoacoustic spectrometer to be evaluated, and recording a background concentration test data set a1 of the gas to be tested after 1 circulation sampling and measurement process is completed; processing the data group a1 to obtain the zero deviation of the photoacoustic spectrometer to be evaluated for each gas component in the gas to be evaluated; opening an environmental noise simulation device, carrying out continuous sound wave frequency scanning at preset sound pressure intensity, introducing the gas to be measured into the photoacoustic spectrometer to be evaluated for multiple continuous measurements, and recording an actual measurement concentration data group a2 of the gas to be measured; and obtaining a photoacoustic cell noise frequency response curve according to the data group a2 and the zero deviation of the photoacoustic spectrometer to be evaluated for each gas component, and quantitatively representing the capacity of the photoacoustic spectrometer to be evaluated for resisting the environmental noise interference.
Further, in the performance evaluation method, the preset sound pressure intensity is 90 to 100dB.
Further, in the performance evaluation method, the processing of the data group a1 includes:
and respectively calculating a standard deviation from the background concentration data of each gas component in the gas to be evaluated recorded in the data group a1, taking 3 times of the standard deviation as an actual measurement index of the photoacoustic spectrometer to be evaluated for the lowest detection lower limit concentration of the corresponding gas component, and taking a difference value between the average value of the actual measurement index of the lowest detection lower limit concentration of each gas component and a concentration zero point as a zero point deviation of the photoacoustic spectrometer to be evaluated for the gas component.
Further, the performance evaluation method further includes: introducing gas to be measured with a first preset concentration into the gas mixing chamber through a gas conveying system to be measured, or simultaneously introducing high-purity nitrogen into the gas mixing chamber through a high-purity nitrogen conveying system to dilute the gas to be measured, performing multiple-cycle measurement on the gas under different conditions through a photoacoustic spectrometer to be evaluated, and recording an actual measured concentration data set a3 of the gas to be measured; and after the data group a3 is averaged, subtracting the known concentration of the standard gas corresponding to the gas to be evaluated, and then taking an absolute value to obtain the measurement error of the photoacoustic spectrometer to be evaluated under the condition of the first preset concentration.
Further, the performance evaluation method further includes: introducing gas to be measured with a first preset concentration into the gas mixing chamber through a gas conveying system to be measured, introducing interference gas with a second preset concentration into the gas mixing chamber through an interference gas conveying system, diluting the interference gas through high-purity nitrogen, measuring the gas entering the photoacoustic spectrometer to be evaluated, and recording an actual measured concentration data set a4 of the gas to be measured; wherein the second preset concentration is 10-100 times of the first preset concentration;
and obtaining the interference influence degree of the interference gas with the second preset concentration on the gas to be detected with the first preset concentration according to the data group a4.
Further, in the performance evaluation method, the gas to be measured is CO or CO 2 、CH 4 、C 2 H 6 、C 2 H 4 And C 2 H 2 The mixed gas of (1).
Further, in the performance evaluation method, the interfering gas is CO or CO 2 、CH 4 、C 2 H 6 、C 2 H 4 And C 2 H 2 One or more of (a).
Further, the performance evaluation method further includes: different salt solutions are sequentially put into the salt solution containing container, so that high-purity nitrogen conveyed by the high-purity nitrogen conveying system flows through the salt solutions with different concentrations respectively and then enters the gas mixing chamber to be mixed with gas to be measured, the gas to be measured is subjected to multiple-cycle measurement through the photoacoustic spectrometer to be evaluated, and an actual measured concentration data set a5 of the gas to be measured is recorded; and subtracting the known concentration of the standard gas corresponding to the gas to be detected from the data group a5, and then taking an absolute value, wherein the maximum value represents the capability of the photoacoustic spectrometry instrument for resisting humidity interference.
The performance evaluation method of the photoacoustic spectroscopy multi-component gas analysis instrument obtains the zero deviation of the photoacoustic spectrometer after obtaining the background concentration test data set of the gas to be tested, obtains the lowest detection limit of the photoacoustic spectrometer to each gas component at the same time, obtains the photoacoustic cell noise frequency response curve according to the measurement data under the influence of environmental noise and the zero deviation of the photoacoustic spectrometer to be evaluated, and realizes the evaluation of the environmental noise interference capability of the photoacoustic spectrometer; and by adding interference gas, the evaluation on the gas cross sensitivity of the photoacoustic spectrometer is realized, and the damage and loss caused by false alarm or alarm missing are reduced to the maximum extent.
Drawings
Various additional advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention. Also, like reference numerals are used to refer to like parts throughout the drawings. In the drawings:
fig. 1 is a schematic structural diagram of a performance evaluation apparatus of a photoacoustic spectroscopy multi-component gas analysis instrument according to an embodiment of the present invention;
fig. 2 is a flowchart of a method for evaluating the performance of a photoacoustic spectroscopy multi-component gas analysis instrument according to an embodiment of the present invention.
Detailed Description
Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited by the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art. It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict. The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
The embodiment of the device is as follows:
referring to fig. 1, the performance evaluation apparatus of the photoacoustic spectroscopy multi-component gas analysis instrument according to the embodiment of the present invention includes: the system comprises a sound insulation box 1, a high-purity nitrogen gas conveying system 6, a gas conveying system 7 to be detected, a salt solution containing container 4 and a gas mixing chamber 3; wherein, the inlet of the saline solution holding container 4 is communicated with the outlet of the high-purity nitrogen gas delivery system 6, and the outlet of the saline solution holding container 4 is communicated with the first inlet of the gas mixing chamber 3, so that the high-purity nitrogen gas flowing out from the high-purity nitrogen gas flow pipeline 6 firstly flows through the saline solution in the saline solution holding container 4 and then enters the gas mixing chamber 3; an outlet of the gas conveying system 7 to be detected is communicated with a second inlet of the gas mixing chamber 3; an environmental noise simulation device and a photoacoustic spectrometer to be evaluated (not shown in the figure) are arranged in the soundproof box 1, and an air inlet of the photoacoustic spectrometer to be evaluated is communicated with an outlet of the gas mixing chamber 3 and is used for detecting the concentration of the gas entering the gas mixing chamber 3; the environment noise simulation device is arranged on one side of the photoacoustic spectrometer to be evaluated and used for simulating environment noise generated when the photoacoustic spectrometer to be evaluated works.
Specifically, the high purity nitrogen gas supply system 6 may be composed of a high purity nitrogen gas flow rate controller 62 and a high purity nitrogen gas cylinder 61, and the flow rate of the high purity nitrogen gas in the high purity nitrogen gas cylinder 61 may be adjusted by the high purity nitrogen gas flow rate controller 62. The purity of the high-purity nitrogen in the high-purity nitrogen cylinder 61 is not less than 99.999 percent.
In this embodiment, the gas to be measured may be a mixed gas in the transformer oil to be measured, or may be simulated by a standard gas. For convenience of operation, the gas to be measured is simulated by a standard gas. The gas conveying system 7 to be tested can be composed of a standard gas cylinder group 71 and a standard gas flow controller 72, and the standard gas flow controller 72 is used for controlling the flow of the standard gas in the standard gas cylinder group 71. The standard gas cylinder group 71 can be prepared from CO and CO with different concentrations 2 、CH 4 、C 2 H 6 、C 2 H 4 、C 2 H 2 Mixed and nitrogen was used as background gas.
High-purity nitrogen and standard gas are mixed in a gas mixing chamber 3 and then are introduced into a photoacoustic spectrometer to be measured in a sound insulation box 1 through an air inlet pipe 2.
The solution 5 in the saline solution container 4 may be a saturated saline solution prepared from sodium chloride, magnesium chloride, etc., the prepared solution has different saturated vapor pressures, each saturated saline solution corresponds to a fixed humidity value, and a series of humidity points may be formed by using different types of salts (for example, saline solutions with humidity of 15%, 30%, 50%, and 80% may be prepared), so as to detect the concentration data of the gas to be detected under different humidity values.
The ambient noise simulation apparatus includes: a controller (not shown in the figure), a signal generator 10, a speaker 11, and a sound pressure meter 12; wherein, the sound pressure meter 12 is connected to the output end of the speaker 11, and is used for detecting the sound pressure of the noise output by the speaker 11; the signal generator 10 is connected with an input end of the loudspeaker 11 and is used for driving the loudspeaker 11 to work; the controller is connected to the sound pressure meter 12 and the signal generator 10, and is configured to control the signal generator 10 to drive the speaker 11 to operate according to the sound pressure data obtained by the sound pressure meter 12, so that the sound pressure in the sound insulation box 1 is maintained within a preset range.
The speaker 11 may be a horn having a good low frequency response characteristic, and the distance from the photoacoustic spectrometer to be evaluated may be kept around 1 m. The lowest response frequency of the sound pressure meter 12 is less than 20Hz. The sound pressure meter 12 measures the sound pressure, and the controller adjusts the signal generator 10 based on the sound pressure measurement result to maintain the sound pressure in the soundproof box 1 at about 50 dB.
In this embodiment, the method may further include: a disturbance gas delivery system (not shown); wherein the outlet of the interfering gas delivery system communicates with the inlet of the gas mixing chamber 3.
Specifically, the gas to be measured is CO or CO 2 、CH 4 、C 2 H 6 、C 2 H 4 And C 2 H 2 In the case of the mixed gas of (3), the interfering gas may be CO or CO 2 、CH 4 、C 2 H 6 、C 2 H 4 And C 2 H 2 And the concentration order of the interfering gas is higher than that of the gas to be measured, so as to more accurately evaluate the influence of the interfering gas on the measurement result of the gas to be measured.
As is obvious from the above description, the performance evaluation device of the photoacoustic spectroscopy multi-component gas analyzer provided in this embodiment simulates the influence of noise on the measurement result in a real working environment through the environmental noise simulation device, so as to facilitate evaluation of the capability of the photoacoustic spectrometer to withstand environmental noise interference; meanwhile, test gases with different types and concentrations can be replaced, the cross sensitivity and the detection limit of the gases can be tested by combining a specific signal processing method, and the damage and loss caused by false alarm or alarm omission can be reduced to the maximum extent by accurately, efficiently and reliably evaluating the key technical indexes of the photoacoustic spectrometer to be evaluated.
The method comprises the following steps:
referring to fig. 2, the invention further provides a method for evaluating the performance of the photoacoustic spectroscopy multi-component gas analysis instrument, which comprises the following steps:
step S1, closing an environmental noise simulation device, discharging solution in a saline solution container, introducing high-purity nitrogen to clean a gas path, starting a gas circulation measurement program of the photoacoustic spectrometer to be evaluated, and recording a background concentration test data set a1 of the gas to be measured after 1 circulation sampling and measurement process is completed; and processing the data group a1 to obtain the zero deviation of the photoacoustic spectrometer to be evaluated for each gas component in the gas to be evaluated.
Since the ambient noise simulator is automatically turned on after the power is turned on, the ambient noise simulator needs to be turned off before background concentration measurement is performed. Meanwhile, the influence of humidity factors needs to be eliminated, and the solution in the saline solution containing container needs to be discharged. And introducing high-purity nitrogen to clean the gas circuit at the flow rate of 1L/min for 10 minutes, and then testing the background concentration of the gas to be tested.
More specifically, the processing step for the data group a1 includes: and respectively solving a standard deviation from the background concentration data of each gas component in the gas to be evaluated recorded in the data group a1, taking 3 times of the standard deviation as an actual measurement index of the photoacoustic spectrometer to be evaluated for the lowest detection lower limit concentration of the corresponding gas component, and taking a difference between the average value of the actual measurement index of the lowest detection lower limit concentration of each gas component and a concentration zero point (a concentration value measured by the photoacoustic spectrometer when no gas is introduced) of the photoacoustic spectrometer to be evaluated as a zero point deviation of the photoacoustic spectrometer to be evaluated for the gas component.
And S2, opening the environmental noise simulation device, carrying out continuous sound wave frequency scanning according to preset sound pressure intensity, introducing the gas to be measured into the photoacoustic spectrometer to be evaluated for multiple continuous measurements, and recording an actual measurement concentration data group a2 of the gas to be measured. The preset sound pressure intensity is 90-100dB, such as 94 dB. The frequency scanning range of the continuous sound wave can be 20-500Hz, and the scanning speed is limited below 10 Hz/min. The period of continuous measurement of the gas to be measured by the photoacoustic spectrometer to be evaluated can be less than 10s, namely, the test is completed within every 10 s.
And S3, obtaining a photoacoustic cell noise frequency response curve according to the data group a2 and the zero deviation of the photoacoustic spectrometer to be evaluated for each gas component, and quantitatively representing the capability of the photoacoustic spectrometer to be evaluated for resisting environmental noise interference.
Specifically, a photoacoustic cell noise frequency response curve is made by subtracting the zero point deviation of the photoacoustic spectrometer to be evaluated for the gas from the concentration data of each gas in the data group a2, and the noise equivalent concentration at the maximum influence frequency is obtained and is expressed as NEC = (x) ppm/Pa (@ xHz), NEC represents a function of the concentration of each gas component in the gas to be evaluated in relation to the noise frequency, x represents the concentration value of the measured gas component, and @ xHz represents that the acoustic frequency is xHz. The noise equivalent acetylene concentration and frequency response curve at the maximum influence frequency are used to quantitatively characterize the ability of the photoacoustic spectroscopy instrument to withstand environmental noise interference.
The present embodiment may further include the following steps:
and S4, introducing gas to be measured with a first preset concentration into the gas mixing chamber through the gas conveying system to be measured, or simultaneously introducing high-purity nitrogen into the gas mixing chamber through the high-purity nitrogen conveying system to dilute the gas to be measured, performing multiple-cycle measurement on the gas under different conditions through the photoacoustic spectrometer to be evaluated, and recording an actual measurement concentration data set a3 of the gas to be measured.
Specifically, the first preset concentration may be 10ppm, and in actual measurement, the concentration ratio of the high-purity nitrogen to the standard gas may be controlled to be 0:1, 1:1, and the like by the high-purity nitrogen flow controller and the standard flow controller, respectively, so as to obtain the concentration measurement data of the gas to be measured under different conditions.
And S5, after the data group a3 is averaged, subtracting the known concentration of the standard gas corresponding to the gas to be evaluated, and then taking an absolute value to obtain the measurement error of the photoacoustic spectrometer to be evaluated under the condition of the first preset concentration.
Specifically, the concentration value of the first preset concentration is low, and accordingly, the measurement error of the photoacoustic spectrometer to be evaluated under the condition of low concentration can be obtained.
The present embodiment may further include the following steps:
s6, introducing gas to be measured with a first preset concentration into the gas mixing chamber through a gas conveying system to be measured, introducing interference gas with a second preset concentration into the gas mixing chamber through an interference gas conveying system, diluting the interference gas through high-purity nitrogen, measuring the gas entering the photoacoustic spectrometer to be evaluated, and recording an actual measured concentration data set a4 of the gas to be measured; wherein the second preset concentration is 10-100 times of the first preset concentration.
Specifically, the gas to be measured is CO or CO 2 、CH 4 、C 2 H 6 、C 2 H 4 And C 2 H 2 The mixed gas of (1). The interference gas is CO or CO 2 、CH 4 、C 2 H 6 、C 2 H 4 And C 2 H 2 One or more of (a). In order to obtain an accurate and reliable evaluation result, the magnitude of the concentration of the interference gas is greatly different from that of the gas to be measured. For example, the concentration of the gas to be measured is 10ppm, and the concentration of CO of 100ppm and 200ppm can be selected as the interfering gas 2 、CH 4 The mixed gas of (1). The interference gas is diluted by the high-purity nitrogen, so that the interference gas with different concentrations can be obtained, more sufficient data can be obtained, and the evaluation result is more accurate and reliable. For example, the following interfering gases can be introduced sequentially to perform cross sensitivity test on the low-concentration gas to be tested with 10ppm respectively: 10ppm CO and 1000ppm CO 2 Standard mixed gas of (2), 10ppm of C 2 H 2 And 1000ppm of CO 2 Standard mixed gas of (2), 10ppm of CH 4 And 1000ppm of C 2 H 6 Standard mixed gas of (2), 10ppm of C 2 H 6 And 1000ppm of CH 4 Standard mixed gas of (2), 10ppm of C 2 H 4 And 1000ppm of CH 4 Standard mixed gas of (2), 10ppm of C 2 H 2 And 1000ppm of C 2 H 6 Standard mixed gas of (2), 10ppm of C 2 H 2 And 1000ppm of C 2 H 4 The standard mixed gas is used for investigating the influence of high-concentration interference gas on the measurement of low-concentration gas to be measured, 5 groups of measurement are carried out, the gas path is cleaned by nitrogen before each measurement, and each group is subjected to 3 times of cyclic measurement to obtain a data group a4.
And S7, obtaining the interference influence degree of the interference gas with the second preset concentration on the gas to be detected with the first preset concentration according to the data group a4.
Specifically, the interference influence degree of the high-concentration interference gas on the low-concentration gas to be measured can be expressed by the percentage of the measurement error of the low-concentration gas to the concentration value of the interference gas and the type of the interference gas. Further, in the same manner as in step S5, the gas concentration measurement error at high concentration can also be obtained from the a 4-group data.
The present embodiment may further include the steps of:
and S8, sequentially putting different salt solutions into the salt solution containing container, enabling the high-purity nitrogen conveyed by the high-purity nitrogen conveying system to flow through the salt solutions with different concentrations respectively and then enter a gas mixing chamber to be mixed with the gas to be measured, performing multiple cycle measurement on the gas to be measured through the photoacoustic spectrometer to be evaluated, and recording an actual measured concentration data group a5 of the gas to be measured.
Specifically, four kinds of saline solutions with different saturated vapor pressures can be placed in a saline solution container, high-purity nitrogen is introduced into each solution, 3 times of cyclic measurement is carried out on gas to be measured, and 12 groups of data are tested in total to obtain a data group a5. The humidity corresponding to the salt solution prepared in this embodiment is 15%, 30%, 50%, and 80%, respectively, and the obtained data set a5 is the concentration detection result of each gas component in the gas to be detected at each humidity point.
And S9, subtracting the known concentration of the standard gas corresponding to the gas to be detected from the data group a5, and then taking an absolute value, wherein the maximum value represents the humidity interference resistance of the photoacoustic spectrometer.
In the embodiment of the present invention, after the steps S2, S4, and S6 are completed, the steps S3, S5, and S7 may be executed. Wherein, the step S2, the step S4 and the step S6 are not in sequence.
The evaluation method and the evaluation apparatus according to the present invention have the same principle, and the relevant points can be referred to each other.
In conclusion, according to the performance evaluation method of the photoacoustic spectroscopy multi-component gas analyzer provided by the invention, the zero deviation of the photoacoustic spectrometer is obtained after the background concentration test data group of the gas to be tested is obtained, the lowest detection limit of the photoacoustic spectrometer on each gas component is obtained at the same time, and the photoacoustic cell noise frequency response curve is obtained according to the measurement data under the influence of environmental noise and the zero deviation of the photoacoustic spectrometer to be evaluated, so that the evaluation on the environmental noise interference capability of the photoacoustic spectrometer is realized; and by adding interference gas, the evaluation on the gas cross sensitivity of the photoacoustic spectrometer is realized, and the damage and loss caused by false alarm or alarm missing are reduced to the maximum extent.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (11)
1. A performance evaluation apparatus of a photoacoustic spectroscopy multi-component gas analysis instrument, comprising: the system comprises a sound insulation box, a high-purity nitrogen conveying system, a to-be-detected gas conveying system, a salt solution containing container and a gas mixing chamber; wherein the content of the first and second substances,
the inlet of the saline solution containing container is communicated with the outlet of the high-purity nitrogen conveying system, the outlet of the saline solution containing container is communicated with the first inlet of the gas mixing chamber, and the high-purity nitrogen flowing out of the high-purity nitrogen flow pipeline firstly flows through the saline solution in the saline solution containing container and then enters the gas mixing chamber; the outlet of the gas conveying system to be detected is communicated with the second inlet of the gas mixing chamber;
an environmental noise simulation device and a photoacoustic spectrometer to be evaluated are arranged in the sound insulation box, and a gas inlet of the photoacoustic spectrometer to be evaluated is communicated with an outlet of the gas mixing chamber and is used for detecting the concentration of gas entering the gas mixing chamber;
the environment noise simulation device is arranged on one side of the photoacoustic spectrometer to be evaluated and used for simulating environment noise generated when the photoacoustic spectrometer to be evaluated works.
2. The performance evaluation device according to claim 1, wherein the environmental noise simulation device includes: the sound pressure measuring device comprises a controller, a signal generator, a loudspeaker and a sound pressure meter; wherein the content of the first and second substances,
the sound pressure meter is connected with the output end of the loudspeaker and used for detecting the sound pressure of the noise output by the loudspeaker;
the signal generator is connected with the input end of the loudspeaker and used for driving the loudspeaker to work;
the controller is connected with the sound pressure meter and the signal generator and used for controlling the signal generator to drive the loudspeaker to work according to sound pressure data obtained by the sound pressure meter, so that the sound pressure in the soundproof box is maintained within a preset range.
3. The performance evaluation apparatus according to claim 1, further comprising: a disturbance gas delivery system; wherein, the first and the second end of the pipe are connected with each other,
the outlet of the interfering gas delivery system is in communication with the inlet of the gas mixing chamber.
4. A performance evaluation method of a photoacoustic spectroscopy multi-component gas analysis apparatus implemented using the performance evaluation apparatus according to any one of claims 1 to 3, characterized by comprising the steps of:
closing the environmental noise simulation device, discharging the solution in the saline solution containing container, introducing a high-purity nitrogen cleaning gas circuit, starting a gas circulation measurement program of the photoacoustic spectrometer to be evaluated, and recording a background concentration test data set a1 of the gas to be tested after 1 circulation sampling and measurement process is completed; processing the data group a1 to obtain the zero deviation of the photoacoustic spectrometer to be evaluated for each gas component in the gas to be evaluated;
opening an environmental noise simulation device, carrying out continuous sound wave frequency scanning with preset sound pressure intensity, introducing the gas to be measured into the photoacoustic spectrometer to be evaluated for multiple continuous measurements, and recording an actual measurement concentration data set a2 of the gas to be measured;
and obtaining a photoacoustic cell noise frequency response curve according to the data group a2 and the zero deviation of the photoacoustic spectrometer to be evaluated for each gas component, and quantitatively representing the capability of the photoacoustic spectrometer to be evaluated for resisting environmental noise interference.
5. The performance evaluation method according to claim 4, wherein the preset sound pressure intensity is 90-100dB.
6. The performance evaluation method according to claim 4, wherein the processing of the data group a1 includes:
and respectively solving a standard deviation from the background concentration data of each gas component in the gas to be evaluated recorded in the data group a1, taking 3 times of the standard deviation as an actual measurement index of the photoacoustic spectrometer to be evaluated for the lowest detection lower limit concentration of the corresponding gas component, and taking a difference value between the average value of the actual measurement index of the lowest detection lower limit concentration of each gas component and the concentration zero point of the photoacoustic spectrometer to be evaluated as the zero point deviation of the photoacoustic spectrometer to be evaluated for the gas component.
7. The performance evaluation method according to claim 4, further comprising:
introducing gas to be measured with a first preset concentration into the gas mixing chamber through a gas conveying system to be measured, or simultaneously introducing high-purity nitrogen into the gas mixing chamber through a high-purity nitrogen conveying system to dilute the gas to be measured, performing multiple-cycle measurement on the gas under different conditions through a photoacoustic spectrometer to be evaluated, and recording an actual measured concentration data set a3 of the gas to be measured;
and after the data group a3 is averaged, subtracting the known concentration of the standard gas corresponding to the gas to be evaluated, and then taking an absolute value to obtain the measurement error of the photoacoustic spectrometer to be evaluated under the condition of the first preset concentration.
8. The performance evaluation method according to claim 7, further comprising:
introducing gas to be measured with a first preset concentration into the gas mixing chamber through a gas conveying system to be measured, introducing interference gas with a second preset concentration into the gas mixing chamber through an interference gas conveying system, diluting the interference gas through high-purity nitrogen, measuring the gas entering the photoacoustic spectrometer to be evaluated, and recording an actual measured concentration data set a4 of the gas to be measured; wherein the second preset concentration is 10-100 times of the first preset concentration;
and obtaining the interference influence degree of the interference gas with the second preset concentration on the gas to be detected with the first preset concentration according to the data group a4.
9. The performance evaluation method according to claim 8, wherein the gas to be measured is CO or CO 2 、CH 4 、C 2 H 6 、C 2 H 4 And C 2 H 2 The mixed gas of (1).
10. The performance evaluation method according to claim 9, wherein the interfering gas is CO or CO 2 、CH 4 、C 2 H 6 、C 2 H 4 And C 2 H 2 One or more of (a).
11. The performance evaluation method according to claim 4, further comprising:
different salt solutions are sequentially put into the salt solution containing container, so that high-purity nitrogen conveyed by the high-purity nitrogen conveying system flows through the salt solutions with different concentrations respectively and then enters the gas mixing chamber to be mixed with the gas to be measured, the gas to be measured is subjected to multiple cycle measurement through the photoacoustic spectrometer to be evaluated, and the actual measured concentration data group a5 of the gas to be measured is recorded;
and subtracting the known concentration of the standard gas corresponding to the gas to be detected from the data group a5, and then taking an absolute value, wherein the maximum value represents the humidity interference resistance of the photoacoustic spectrometer.
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| CN114062277A (en) * | 2021-12-10 | 2022-02-18 | 杭州晟冠科技有限公司 | Calibration device and method for monitoring system of dissolved gas in photoacoustic spectroscopy transformer oil |
| CN114739912B (en) * | 2022-03-29 | 2022-11-18 | 安徽理工大学 | Synchronous detection system and detection method for trace oxynitride based on photoacoustic spectroscopy |
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