CN112881296B - Experimental platform for photoacoustic spectroscopy device environmental factor influence analysis - Google Patents
Experimental platform for photoacoustic spectroscopy device environmental factor influence analysis Download PDFInfo
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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
- G01N21/1702—Systems in which incident light is modified in accordance with the properties of the material investigated with opto-acoustic detection, e.g. for gases or analysing solids
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01L—CHEMICAL OR PHYSICAL LABORATORY APPARATUS FOR GENERAL USE
- B01L9/00—Supporting devices; Holding devices
- B01L9/02—Laboratory benches or tables; Fittings therefor
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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
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
- G01N29/02—Analysing fluids
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
- G01N29/22—Details, e.g. general constructional or apparatus details
- G01N29/24—Probes
- G01N29/2418—Probes using optoacoustic interaction with the material, e.g. laser radiation, photoacoustics
- G01N29/2425—Probes using optoacoustic interaction with the material, e.g. laser radiation, photoacoustics optoacoustic fluid cells therefor
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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
- G01N21/1702—Systems in which incident light is modified in accordance with the properties of the material investigated with opto-acoustic detection, e.g. for gases or analysing solids
- G01N2021/1704—Systems in which incident light is modified in accordance with the properties of the material investigated with opto-acoustic detection, e.g. for gases or analysing solids in gases
Abstract
An experiment platform for analyzing the influence of various environmental factors on a photoacoustic spectroscopy device comprises a computer, a wireless communication module, an experiment cabin, a signal control and processing system and a data acquisition and communication system. The experiment cabin comprises a temperature module, a humidity module and an air pressure module and is used for simulating different working conditions. The photoacoustic spectrum detection system is arranged in the experiment cabin. The computer and the wireless communication module are connected with the experimental cabin, and the output end of the photoacoustic spectrum detection system is connected with the signal control and processing system and the data acquisition and communication system. The invention simulates the actual working condition of the photoacoustic spectrometry detection system through the multi-parameter environment composite experimental device, measures the influence of the environment under the composite environment on the detection result of the photoacoustic spectrometry detection system, and realizes the detection of the robustness of the photoacoustic spectrometry detection system.
Description
FIELD
The invention relates to an experimental platform for analyzing the influence of various environmental factors of a photoacoustic spectroscopy device.
Background
The photoacoustic spectrometry technology has the advantages of high sensitivity, high detection speed, no gas sample consumption, capability of detecting multi-component gas and the like, and is widely applied to SF in the field of electrical engineering at present 6 Decomposition gas detection. But at the same time, photoacoustic spectroscopy indirectly detects weak acoustic signals excited by detection lightThe gas concentration is measured, so the gas concentration is easily influenced by external environmental factors. When the temperature, humidity, air pressure and the like in the environment where the photoacoustic spectrometer is located change, the detection result of the photoacoustic spectrometer can drift, so that the accuracy of gas concentration measurement is improved. Therefore, it is necessary to simulate the working environment of the photoacoustic spectrometer and to make a method for correcting the detection result of the photoacoustic spectrometer when the photoacoustic spectrometer is applied to an actual engineering scene. However, in the current research, only a single environmental parameter of the photoacoustic spectrum can be set, and the mutual influence of the environmental parameters is ignored, so that it is difficult to accurately simulate various environmental factors.
Patent 201110414592.8 develops an SF 6 The automatic constant-temperature photoacoustic detection device for decomposing components is additionally provided with an automatic constant-temperature system on the basis of a photoacoustic spectrometer, and can eliminate the interference of an external environment on a detection result, so that the detection precision of the photoacoustic spectrometer is improved, however, for the photoacoustic spectrometer applied to scenes such as trains, the difficulty for maintaining the constant detection environment is high, and the constant-temperature system is difficult to apply; the patent 201820940762.3 proposes an opto-acoustic spectrometer applied to a traction transformer of an electrified railway, which is characterized in that on the basis of analyzing oil-gas separation, vibration information is additionally acquired, so that the state of the transformer can be comprehensively analyzed, but the influence of the vibration information on the detection result of the opto-acoustic spectrometer is not qualitatively analyzed, and the method is difficult to apply when the application scene changes; patent 201210216101.3 discloses a portable SF capable of displaying related information such as temperature and air pressure 6 The photoacoustic spectroscopy detection apparatus, which is a gas decomposition product, can provide a photoacoustic spectroscopy detection result and an environmental parameter corresponding thereto, but does not deeply analyze the influence of factors such as temperature and gas pressure on the photoacoustic spectroscopy detection result.
Disclosure of Invention
The invention aims to solve the defect of correction of the detection result of a photoacoustic spectrometer under the influence of various environmental factors, and provides an experimental platform for researching the influence of various environmental factors of a photoacoustic spectroscopy device, which is used for simulating different working environments possibly encountered by the photoacoustic spectrometer in actual operation and qualitatively and quantitatively describing the influence of the environmental factors on the detection result of the photoacoustic spectrometer. According to the invention, the experiment platform is established to simulate different working environments, so that each environmental factor can be separated to perform a simulation experiment, a composite environment simulation experiment with multiple environmental factors acting simultaneously can be realized, an operator is helped to establish a correction method of the detection result of the photoacoustic spectrometer under the action of multiple environmental factors, and the reliability of the photoacoustic spectrometer is improved.
The invention comprises a computer, an experimental cabin, a signal control and processing system and a data acquisition and communication system. The photoacoustic spectrometer is arranged in an experiment cabin, and the experiment cabin is used for simulating the actual working environment of the photoacoustic spectrometer.
The laboratory is provided with three functional modules including a temperature module, a humidity module and an air pressure module. Each functional module comprises a communication unit, a processing unit and an execution unit. The communication unit, the processing unit and the execution unit are sequentially connected by a signal line. The communication units of each functional module are connected in pairs by signal lines.
The computer is used for inputting environmental parameters, forming instructions and transmitting the instructions to the communication unit of each functional module in the laboratory, and then the processing unit and the execution unit of each functional module process and execute the instructions. The computer is connected with the communication units of the functional modules through signal lines.
The experimental cabin is provided with an air inlet and an air outlet. The photoacoustic spectrometer is arranged in the experimental cabin, the air inlet of the photoacoustic cell in the photoacoustic spectrometer is connected with the air inlet of the experimental cabin, and the air outlet of the photoacoustic cell in the photoacoustic spectrometer is connected with the air outlet of the experimental cabin, so that a circulating air path is formed. The photoacoustic spectrometer can be replaced, so that the related experiments of various photoacoustic spectrometers can be carried out. The output end of the photoacoustic spectrometer is sequentially connected with the signal control and processing system, the data acquisition and communication system and the computer through signal wires. The air inlet is the stereoplasm container, and one side that is close to the experiment cabin is opened there is the flange hole for link to each other with outside gas circuit, and the flange hole of air inlet opposite side is used for linking to each other with the air inlet of photoacoustic spectrometer, so that the inside gas of air inlet and photoacoustic spectrometer's inside gaseous circulation, but not with the gaseous circulation in the experiment cabin. The air inlet is internally provided with a temperature sensor, a humidity sensor, an air pressure sensor and execution units, each sensor is respectively connected with the processing unit of the corresponding functional module and the computer through signal wires, and each execution unit is respectively connected with the processing unit of the corresponding functional module through signal wires. The temperature sensor, the humidity sensor and the air pressure sensor are respectively used for reading the temperature, the humidity and the air pressure of the air in the air inlet.
The experimental cabin is a closed independent system and has no gas exchange with the outside. The temperature module, the humidity module and the air pressure module are mainly used for adjusting the temperature, the humidity and the air pressure in the experiment cabin and keeping the environmental parameters in the experiment cabin consistent with those set by the computer.
The experiment platform is of a distributed structure, and the temperature module, the humidity module and the air pressure module in the experiment chamber have the capability of independently processing data and can execute local application calculation processing. Meanwhile, the experiment platform can also perform global application calculation processing. The functional modules can communicate with each other, so that cooperation among the functional modules is formed, and instructions sent by the computer are completed. The communication units of the functional modules are connected by signal lines.
The experiment platform adjusts the state of the object to be detected of the photoacoustic spectrometer through mutual cooperation among the functional modules of the experiment cabin, so that the change of the detection result of the photoacoustic spectrometer under different environmental parameters is analyzed.
The functional modules of the experimental cabin cooperate in the following modes:
(1) Firstly, the mutual influence condition of the functional modules is determined. And reading the values of the temperature sensor, the humidity sensor and the air pressure sensor by the computer, and recording and using the values as the current environmental parameter values. The computer inputs a temperature set value, and the temperature set value is higher than the current temperature value. The computer transmits the instruction of adjusting the temperature value to the set value to the temperature module. And transmitting no-action instructions to the humidity module and the air pressure module.
(2) After the communication unit of the temperature module receives the instruction, the execution unit performs a temperature rise action, the value of the temperature sensor is read in real time, the value of the temperature sensor is returned to the communication unit of the temperature module and is transmitted to the processing unit by the communication unit to analyze whether the current temperature value is consistent with the set value or not, if not, the temperature rise action is continuously executed, and if so, the temperature rise action is stopped.
(3) The humidity module and the air pressure module respectively read the values of the humidity sensor and the air pressure sensor and record the humidity and the air pressure values in the temperature rising process. And the processing unit respectively records the change relation of the humidity and the air pressure in the experiment platform along with the temperature and performs function fitting. Thereby defining the influence on other environmental parameters when the temperature is changed independently.
(4) And repeating the steps to respectively determine the change conditions of the temperature and the air pressure when the humidity is changed independently and the change conditions of the temperature and the humidity when the air pressure is changed independently.
(5) And after the mutual influence condition of the functional modules is determined, waiting for the experiment platform to return to the initial state.
(6) And inputting the set environmental parameter values including temperature, humidity and air pressure by the computer, transmitting the values to corresponding functional modules in the experimental cabin, and transmitting an instruction for adjusting the environmental parameter values to the set values.
(7) After receiving the instruction, each functional module respectively reads the values of the temperature sensor, the humidity sensor and the air pressure sensor and compares the values with set values.
(8) The processing unit of the functional module compares the current corresponding environmental parameter value with the set value, if the two are not consistent, the processing unit transmits a command to the execution unit, and adjusts the environmental parameter value until the current environmental parameter value is consistent with the set value; if the environmental parameter values are consistent, the execution unit is not given an instruction for the moment, and the information of the environmental parameter values at the moment is transmitted to other modules through the communication unit.
(9) Through the cooperation between the functional modules, when the current environmental parameter value is consistent with the set value, the functional modules stop acting and transmit information to the computer through the communication unit, so that the adjustment of the photoacoustic spectroscopy composite environmental parameter is completed.
The invention has the following remarkable advantages:
(1) By establishing an experimental platform, the invention can realize the combined action of various environmental factors on the photoacoustic spectrometer and explore the qualitative and quantitative change of the detection result of the photoacoustic spectrometer under the composite influence.
(2) According to the invention, the self-adjustment of the functional modules is realized by establishing the distributed structure, and the influence of other environmental factors can be effectively avoided when the environmental factors are analyzed, so that the influence of the environmental factors on the acousto-optic spectrometer is accurately evaluated.
Drawings
FIG. 1 is a schematic diagram of an experimental platform according to the present invention;
in the figure: the system comprises a computer 1, an experimental cabin 2, a temperature module 2-1, a humidity module 2-2, an air pressure module 2-3, an air inlet 2-4, an air outlet 2-5, a photoacoustic spectrometer 3, a signal control and processing system 4 and a data acquisition and communication system 5; the arrows indicate the direction of signal transfer.
FIG. 2 is a schematic diagram of a communication structure of the experimental cabin of the present invention;
in the figure: 2-1 temperature module, 2-2 humidity module and 2-3 air pressure module; the arrows between the modules indicate the direction of communication.
Detailed Description
The invention is further described with reference to the following drawings and detailed description.
As shown in FIG. 1, the experiment platform of the present invention is equipped with a photoacoustic spectrometer. The experiment cabin of the experiment platform is used for providing a simulated working environment of the photoacoustic spectrometer.
The experimental cabin comprises a plurality of functional modules such as a temperature module, a humidity module and an air pressure module, and the functional modules are independent from each other in function and can communicate with each other. The functional modules act on the same photoacoustic spectrometer. Each module can communicate with another module, and processes data and executes instructions according to communication results.
The computer 1 is connected with the temperature module 2-1, the humidity module 2-2 and the air pressure module 2-3 through signal lines and used for transmitting instructions. The output end of the photoacoustic spectrometer 3, the signal control and processing system 4, the data acquisition and communication system 5 and the computer 1 are sequentially connected through signal wires. The wall of the experimental cabin is provided with an experimental cabin air inlet 2-4 and an experimental cabin air outlet 2-5. The experiment cabin air inlet 2-4 is a hard container, and one side of the experiment cabin air inlet 2-4 close to the experiment cabin is provided with a flange hole for installing a steel pipe air passage which is connected with an external air passage, so that standard gas enters the photoacoustic cell from the outside through the air inlet. The flange hole on the other side of the experiment chamber air inlet 2-4 is used for being connected with the air inlet of the photoacoustic spectrometer 3, so that the gas inside the experiment chamber air inlet 2-4 is communicated with the gas inside the photoacoustic spectrometer 3 but is not communicated with the gas in the experiment chamber 2. A temperature sensor, a humidity sensor, an air pressure sensor and an execution unit are arranged in the air inlet 2-4 of the experiment cabin, and the sensors and the execution unit are respectively connected with the processing unit of the temperature module 2-1, the processing unit of the humidity module 2-2 and the processing unit of the air pressure module 2-3 through signal lines.
The air inlet of the photoacoustic spectrometer 3 is connected with the air inlet 2-4 of the experimental cabin through an air path, and the air outlet of the photoacoustic spectrometer 3 is connected with the air outlet 2-5 of the experimental cabin through an air path. Because the air inlets 2-4 of the experimental chamber are connected with the photoacoustic cell of the photoacoustic spectrometer, the sensor can measure the temperature, the humidity and the air pressure of a detection object of the photoacoustic spectrometer. Similarly, the execution unit can adjust the state of the detection object of the photoacoustic spectrometer by adjusting the temperature, the humidity and the air pressure at the air inlet 2-4 of the experiment chamber.
The working process of the invention is as follows:
and closing all the environmental factor function modules, introducing high-purity nitrogen into the photoacoustic spectrum detection system to clean the gas path, introducing acetylene gas as an experimental object, opening the photoacoustic spectrum detection system, preheating for half a minute, recording the environmental parameters at the moment through a temperature sensor, a humidity sensor and an air pressure sensor, and recording the corresponding photoacoustic signal value. And starting the experiment platform, inputting the set environmental parameter value through a computer, and adjusting the environmental parameter by the functional module in the laboratory. And after the environmental parameters are consistent with the set values, stabilizing for half a minute, and recording the photoacoustic signal value at the moment. And adjusting environmental parameters, repeating the steps and respectively recording corresponding experimental data. After the experimental data are obtained, a scatter diagram under a three-dimensional coordinate is drawn by taking the temperature, the humidity and the air pressure as coordinate axes respectively, and the color depth of the scatter diagram is used for representing the magnitude of the photoacoustic signal value, so that the change condition of the detection result of the photoacoustic spectrometer of the same object to be detected under the composite influence of the temperature, the humidity and the air pressure can be obtained, and qualitative and quantitative analysis can be further performed.
Claims (1)
1. An experiment platform for analyzing the influence of multiple environmental factors on a photoacoustic spectroscopy device is characterized by comprising a computer (1), an experiment cabin, a signal control and processing system and a data acquisition and communication system, wherein the computer is connected with the experiment cabin; the photoacoustic spectrometer (3) is arranged in a laboratory chamber, and the laboratory chamber is used for simulating the actual working environment of the photoacoustic spectrometer and comprises a temperature module (2-1), a humidity module (2-2) and an air pressure module (2-3); the computer (1) is respectively connected with the temperature module (2-1), the humidity module (2-2) and the air pressure module (2-3) through signal lines; the output end of the photoacoustic spectrometer (3), the signal control and processing system (4), the data acquisition and communication system (5) and the computer (1) are sequentially connected by signal wires;
a functional module: the temperature module (2-1), the humidity module (2-2) and the air pressure module (2-3) comprise communication units, processing units and execution units; the communication unit is used for communicating with the computer (1) and the communication units of other modules; the processing unit processes according to the instruction received by the communication unit and determines the action of the execution unit; the execution unit is used for receiving the instruction and carrying out corresponding action;
the cabin wall of the experimental cabin is provided with an experimental cabin air inlet (2-4) and an experimental cabin air outlet (2-5); the air inlet (2-4) of the experiment cabin is a hard container, and one side of the air inlet (2-4) of the experiment cabin, which is close to the experiment cabin, is provided with a flange hole which is connected with an external air path and used for air inlet; the flange hole on the other side of the air inlet (2-4) of the experiment chamber is used for being connected with the air inlet of the photoacoustic spectrometer (3), so that the gas inside the air inlet (2-4) of the experiment chamber can be communicated with the gas inside the photoacoustic spectrometer (3) but not communicated with the gas in the experiment chamber (2); the experimental cabin air inlet (2-4) is internally provided with a temperature sensor, a humidity sensor, an air pressure sensor, an execution unit of a temperature module (2-1), a humidity module (2-2) and an air pressure module (2-3), and the temperature sensor, the humidity sensor, the air pressure sensor and the execution unit are respectively connected with a processing unit of the temperature module (2-1), a processing unit of the humidity module (2-2) and a processing unit of the air pressure module (2-3) through signal lines;
the air inlet of the photoacoustic spectrometer (3) is connected with the air inlet (2-4) of the experiment cabin through an air path, and the air outlet of the photoacoustic spectrometer (3) is connected with the air outlet (2-5) of the experiment cabin through an air path; because the air inlet (2-4) of the experimental cabin is connected with the photoacoustic cell of the photoacoustic spectrometer, the execution unit adjusts the state of the detection object of the photoacoustic spectrometer by adjusting the temperature, the humidity and the air pressure at the air inlet (2-4) of the experimental cabin;
the experiment platform adjusts the state of an object to be detected of the photoacoustic spectrometer through mutual cooperation among the functional modules of the temperature module (2-1), the humidity module (2-2) and the air pressure module (2-3) of the experiment cabin, and analyzes the change of the detection result of the photoacoustic spectrometer under different environmental parameters;
the functional modules of the experimental cabin cooperate in the following modes:
(1) Firstly, determining the mutual influence condition of each functional module; reading values of a temperature sensor, a humidity sensor and an air pressure sensor by a computer (1) and recording the values as current environmental parameter values; a temperature set value is input by the computer (1), the temperature set value is higher than the current temperature value, and the computer transmits an instruction for adjusting the temperature value to the set value to the temperature module; transmitting no-action instructions to the humidity module and the air pressure module;
(2) After the communication unit of the temperature module receives the instruction, the execution unit performs a heating action, reads the value of the temperature sensor in real time, returns the value of the temperature sensor to the communication unit of the temperature module, and transmits the value to the processing unit by the communication unit to analyze whether the current temperature value is consistent with the set value or not, if not, the heating action is continuously executed, and if so, the heating action is stopped;
(3) The humidity module and the air pressure module respectively read the values of the humidity sensor and the air pressure sensor, record the humidity value and the air pressure value in the temperature rising process, respectively record the change relation of the humidity and the air pressure in the experiment platform along with the temperature by the processing unit, and perform function fitting, so as to analyze the influence condition on other environmental parameters when the temperature independently changes;
(4) Repeating the steps, and respectively determining the temperature and air pressure change conditions when the humidity changes independently and the temperature and humidity change conditions when the air pressure changes independently;
(5) After the mutual influence condition of all the functional modules is determined, waiting for the experiment platform to return to the initial state;
(6) Inputting the set environmental parameter values including temperature, humidity and air pressure by the computer, transmitting the values to corresponding functional modules in the experimental cabin, and transmitting an instruction for adjusting the environmental parameter values to the set values;
(7) After receiving the instruction, each functional module respectively reads the values of the temperature sensor, the humidity sensor and the air pressure sensor and compares the values with set values;
(8) The processing unit of the functional module compares the current corresponding environmental parameter value with the set value, if the two are not consistent, the processing unit transmits a command to the execution unit, and adjusts the environmental parameter value until the current environmental parameter value is consistent with the set value; if the environmental parameter values are consistent, the execution unit is not given an instruction for the moment, and the information of the environmental parameter values at the moment is transmitted to other modules through the communication unit;
(9) Through the cooperation between the functional modules, when the current environmental parameter value is consistent with the set value, the functional modules stop acting and transmit information to the computer through the communication unit, so that the adjustment of the photoacoustic spectroscopy composite environmental parameter is completed.
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