CN110806396A - Gas concentration compensation device and method - Google Patents

Abstract

The present application discloses a gas concentration compensation device, which includes a gas storage, and windows are provided in the first area and the second area of the side wall of the gas storage; windows are embedded in the windows; for measuring the pressure of the gas; a collimator located outside the first area; a laser connected to the collimator for generating laser light; a detector located outside the second area and opposite the collimator for receiving the absorbed gas and convert the absorbed laser into an electrical signal; the controller connected to the detector is used to obtain the gas absorption spectrum corresponding to the current pressure according to the electrical signal, and according to the gas absorption spectrum under multiple different pressures The figure fits the pressure compensation function for compensating the gas concentration, and uses the pressure compensation function to compensate the gas concentration to improve the accuracy of the gas concentration. In addition, the present application also provides a gas concentration compensation method with the above advantages.

Description

A gas concentration compensation device and method

technical field

The present application relates to the technical field of gas concentration detection, and in particular, to a gas concentration compensation device and method.

Background technique

HF (hydrogen fluoride) gas is an important discharge characteristic gas in high-voltage combined electrical equipment. HF gas can effectively reflect the severity of partial discharge caused by insulation defects. In order to track the internal fault status of high-voltage combined electrical equipment, realize rapid detection of equipment faults, and timely perform maintenance for specific faults, the content of HF gas in the gas chamber of high-voltage combined electrical equipment can be detected in real time, so as to avoid performance degradation of high-voltage electrical equipment or even insulation accidents. .

HF gas needs to be detected by semiconductor tunable laser absorption spectroscopy (TDLAS). HF gas absorbs the laser light, and then an absorption line is generated. The TDLAS detection technology calculates the gas concentration through the absorption line. When the gas pressure changes, the absorption spectrum of HF gas will change. If the absorption spectrum change caused by the pressure change is not compensated, the measurement result of the absorption spectrum will be inaccurate. Therefore, how to provide a device capable of compensating the HF gas concentration is a technical problem to be solved urgently by those skilled in the art.

SUMMARY OF THE INVENTION

The purpose of the present application is to provide a gas concentration compensation device and method to improve the measurement accuracy of the gas concentration.

In order to solve the above-mentioned technical problems, the present application provides a gas concentration compensation device, comprising:

a gas storage, and both the first area and the second area of the sidewall of the gas storage are provided with windows;

a window sheet inlaid on the window;

a pressure gauge located in the gas storage for measuring the pressure of the gas;

a collimator located outside the first region;

a laser connected to the collimator for generating laser light;

a detector located outside the second area and opposite to the collimator, for receiving the laser light absorbed by the gas and converting the absorbed laser light into an electrical signal;

A controller connected to the detector is used for obtaining a gas absorption spectrum corresponding to the current pressure according to the electrical signal, and fitting a pressure for compensating the gas concentration according to the gas absorption spectrum under a plurality of different pressures Compensation function, the gas concentration is compensated by the pressure compensation function.

Optionally, also include:

a temperature control assembly located on the side wall of the gas storage for adjusting the temperature of the gas;

Correspondingly, the controller is further configured to fit a temperature and pressure compensation function according to a plurality of gas absorption spectra at different temperatures.

Optionally, the number of the temperature control components is two, and the temperature control components are symmetrical with respect to the center of the gas storage.

Optionally, the window sheet is a K9 glass sheet.

Optionally, the detector is a photodiode or an avalanche photodiode.

Optionally, the laser is any one of a distributed feedback semiconductor laser, a distributed Bragg reflection laser, a vertical cavity surface emitting laser, an external cavity tuned semiconductor laser, and a Fa-Per laser.

The present application also provides a gas concentration compensation method, which is applied to any of the above-mentioned gas concentration compensation devices, including:

Obtain a number of different current pressures measured by the pressure gauges in the gas storage;

respectively obtaining a first electrical signal corresponding to the current pressure, wherein the first electrical signal is obtained by laser conversion after being absorbed by the gas;

determining a gas absorption spectrum corresponding to the current pressure according to the first electrical signal;

According to the current pressure and the gas absorption spectrum, a pressure compensation function for compensating the gas concentration is fitted;

Obtain gas concentration and pressure;

The gas concentration is compensated according to the pressure compensation function and the pressure to obtain the compensated gas concentration.

Optionally, before the obtaining of the gas concentration, the method further includes:

obtaining a plurality of different current temperatures of the gas in the gas storage;

respectively obtaining a second electrical signal corresponding to the current temperature;

determining a gas absorption spectrum corresponding to the current temperature according to the second electrical signal;

According to the current temperature and the gas absorption spectrum, a temperature and pressure compensation function for compensating the gas concentration is fitted;

Accordingly, obtaining gas concentration and pressure includes:

Obtain gas concentration, pressure, temperature;

Correspondingly, the gas concentration is compensated according to the pressure compensation function and the pressure, and the obtained gas concentration after compensation includes:

The gas concentration is compensated according to the temperature and pressure compensation function, the pressure, and the temperature to obtain the compensated gas concentration.

The gas concentration compensation device provided by the present application includes a gas storage, and the first area and the second area of the side wall of the gas storage are provided with windows; windows are embedded in the windows; the pressure measurement in the gas storage a collimator located outside the first area; a laser connected to the collimator for generating laser light; located outside the second area and connected to the collimator The opposite detector is used to receive the laser light absorbed by the gas and convert the absorbed laser light into an electrical signal; the controller connected to the detector is used to obtain the gas corresponding to the current pressure according to the electrical signal The absorption spectrum is obtained, and a pressure compensation function for compensating the gas concentration is fitted according to the gas absorption spectrum under a plurality of different pressures, and the gas concentration is compensated by using the pressure compensation function.

It can be seen that the gas storage in the gas concentration compensation device of the present application is used to store the gas. The laser emitted by the laser passes through the collimator and is injected into the gas storage from the window, and the laser is absorbed by the gas and then emitted from the window and irradiated to the detector. The detector converts the absorbed laser light into an electrical signal and transmits it to the controller. The controller obtains the gas absorption spectrum corresponding to the current pressure according to the electrical signal, and changes the current pressure to obtain multiple gas absorption spectra. The pressure and the absorption spectrum in the gas absorption spectrum corresponding to the current pressure are fitted to obtain a pressure compensation function. After obtaining the concentration of the gas, use the pressure compensation function to compensate, and then the compensated concentration of the gas can be obtained, which improves the accuracy of the gas concentration. Spend. In addition, the present application also provides a gas concentration compensation method with the above advantages.

Description of drawings

In order to illustrate the technical solutions of the embodiments of the present application or the prior art more clearly, the following briefly introduces the accompanying drawings that need to be used in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only For some embodiments of the present application, for those of ordinary skill in the art, other drawings can also be obtained according to these drawings without any creative effort.

1 is a schematic structural diagram of a gas concentration compensation device provided by an embodiment of the application;

2 is a schematic structural diagram of another gas concentration compensation device provided by an embodiment of the application;

3 is a flowchart of a gas concentration compensation method provided by an embodiment of the application;

FIG. 4 is a flowchart of another gas concentration compensation method provided by an embodiment of the present application.

Detailed ways

In order to make those skilled in the art better understand the solution of the present application, the present application will be further described in detail below with reference to the accompanying drawings and specific embodiments. Obviously, the described embodiments are only a part of the embodiments of the present application, but not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present application.

Please refer to FIG. 1. FIG. 1 is a schematic structural diagram of a gas concentration compensation device provided by an embodiment of the present application. The device includes:

The gas storage 1, and the first area and the second area opposite to the side wall of the gas storage 1 are provided with windows;

a window sheet 2 inlaid on the window;

a pressure gauge 3 located in the gas storage 1 for measuring the pressure of the gas;

a collimator 4 located outside the first area;

a laser 5 connected to the collimator 4 for generating laser light;

a detector 6 located outside the second area and opposite to the collimator 4, for receiving the laser light absorbed by the gas, and converting the absorbed laser light into an electrical signal;

The controller 7 connected to the detector 6 is used to obtain the gas absorption spectrum corresponding to the current pressure according to the electrical signal, and to compensate the gas concentration by fitting the gas absorption spectrum under a plurality of different pressures The pressure compensation function is used to compensate the gas concentration.

Wherein, the first area and the second area are located on the side wall of the gas storage 1 and the purpose of the first area and the second area being opposite is that the laser is incident from the window of the first area and exits from the window of the second area, and the laser can pass through Gas in gas storage 1.

Preferably, the first region and the second region are symmetrical with respect to the center of the gas storage 1 .

Specifically, the laser 5 is connected to the collimator 4 through an optical fiber, the detector 6 is connected to the controller 7 through a cable, and the pressure measuring gauge 3 can be connected to the controller 7 to directly transmit the measured pressure value to the controller 7, and also The value of the pressure gauge 3 can be manually entered into the controller 7 .

It can be understood that the shape of the gas storage 1 can be set arbitrarily, for example, a cube, a cylinder, a prism, and the like. It can also be understood that the gas storage 1 is provided with an air inlet 11 and a gas outlet 12 so that the gas enters and escapes and the pressure in the gas storage 1 is adjusted.

Preferably, the window sheet 2 is a K9 glass sheet, or other window sheet 2 that can transmit infrared light.

It should be pointed out that the type of the laser 5 is not specifically limited in this embodiment, and it may be determined according to the situation. For example, the laser 5 is any one of a distributed feedback semiconductor laser 5 , a distributed Bragg reflection laser 5 , a vertical cavity surface emitting laser 5 , an external cavity tuned semiconductor laser 5 , and a Fa-Per laser 5 . Similarly, the type of the detector 6 is not specifically limited in this embodiment, and can be set by yourself. For example, the detector 6 is a photodiode or an avalanche photodiode.

The gas storage 1 in the gas concentration compensation device of this embodiment is used to store gas. The laser light emitted by the laser 5 passes through the collimator 4 and is injected into the gas storage 1 from the window 2, and the laser is absorbed by the gas and then emitted from the window 2 , irradiate on the detector 6, the detector 6 converts the absorbed laser light into an electrical signal and transmits it to the controller 7. The controller 7 obtains the gas absorption spectrum corresponding to the current pressure according to the electrical signal, and can be obtained by changing the current pressure. A pressure compensation function is obtained by fitting multiple gas absorption spectra according to the current pressure and the absorption lines in the gas absorption spectra corresponding to the current pressure. After obtaining the gas concentration, the pressure compensation function is used to compensate, and the gas compensation can be obtained. After the concentration, the accuracy of the gas concentration is improved.

Please refer to FIG. 2 , which is a schematic structural diagram of another gas concentration compensation device provided by an embodiment of the present application.

On the basis of the above embodiment, in an embodiment of the present application, the gas concentration compensation device further includes:

The temperature control component located on the side wall of the gas storage 1 is used to adjust the temperature of the gas;

Correspondingly, the controller 7 is further configured to fit a temperature and pressure compensation function according to a plurality of gas absorption spectra at different temperatures.

Optionally, in an embodiment of the present application, the temperature control component includes a heating component and a temperature controller 7, and the temperature controller 7 controls the temperature of the heating component, thereby controlling the temperature of the gas in the gas storage 1, but this application does not It is not specifically limited. In other embodiments of the present application, the temperature control component is only a heating component, which is directly connected to the controller 7 and controlled by the controller 7 .

Preferably, the heating element is arranged in the interlayer of the side wall of the gas storage 1 to avoid waste of heat generated by the heating element.

In an embodiment of the present application, the number of the temperature control components is two, and the temperature control components are symmetrical with respect to the center of the gas storage 1. When the gas is heated, the heating speed of the gas is accelerated.

The gas concentration compensation device provided in this embodiment can measure the absorption spectrum of the gas at different pressures and different temperatures, obtain a temperature and pressure compensation function for compensating the gas concentration, and use the temperature and pressure compensation function to perform the gas concentration compensation. Compensation to further improve the accuracy of gas concentration.

The present application also provides a gas concentration compensation method, which is applied to any of the above-mentioned gas concentration compensation devices. Please refer to FIG. 3 . The method includes:

Step S101: Obtain a plurality of different current pressures measured by a pressure gauge in the gas storage.

It should be noted that when the gas in the gas storage is under different current pressures, other parameters such as the concentration and temperature of the gas are equal.

Step S102 : respectively obtaining a first electrical signal corresponding to the current pressure, wherein the first electrical signal is obtained by laser conversion after being absorbed by the gas.

Specifically, the first electrical signal is sent by the detector, and absorption occurs when the laser passes through the gas in the gas storage, and the detector converts the laser signal into a first electrical signal corresponding to the intensity of the laser signal. Under different conditions, the absorption of the laser light by the gas is different, and the first electrical signal converted into the detector is also different.

Step S103: Determine a gas absorption spectrum corresponding to the current pressure according to the first electrical signal.

Step S104 : Fitting a pressure compensation function for compensating the gas concentration according to the current pressure and the gas absorption spectrum.

There is one absorption line in each absorption spectrum, that is, each current pressure corresponds to an absorption line, and the pressure compensation function y=f(P, C) is obtained by fitting multiple absorption spectra, where P represents Pressure, C represents concentration, and the fitting process is well known to those skilled in the art, and will not be described in detail here.

Step S105: Obtain gas concentration and pressure.

It can be understood that the gas concentration in this step needs to be compensated, and the pressure is the pressure of the gas in the process of measuring the gas concentration to be compensated.

Step S106: Compensate the gas concentration according to the pressure compensation function and the pressure to obtain a compensated gas concentration.

Specifically, the gas concentration after compensation can be obtained by bringing the gas concentration and pressure into the pressure compensation function for calculation.

The gas concentration compensation method provided in this embodiment is performed by the above-mentioned gas concentration compensation device, and the obtained pressure compensation function is used to compensate the gas concentration, thereby improving the accuracy of the gas concentration.

Please refer to FIG. 4 , which is a flowchart of another gas concentration compensation method provided by an embodiment of the present application.

Step S201: Obtain a plurality of different current pressures measured by a pressure gauge in the gas storage.

Step S202 : respectively obtaining a first electrical signal corresponding to the current pressure, wherein the first electrical signal is obtained by laser conversion after being absorbed by the gas.

Step S203: Determine a gas absorption spectrum corresponding to the current pressure according to the first electrical signal.

Step S204: Fitting a pressure compensation function for compensating for gas concentration according to the current pressure and the gas absorption spectrum.

Step S205: Obtain multiple different current temperatures of the gas in the gas storage.

It can be understood that when the gas is at a plurality of different current temperatures, the pressure of the gas is equal, that is, the temperature is a single variable.

Step S206: Obtain second electrical signals corresponding to the current temperature respectively.

It can be understood that the second electrical signal is obtained by laser conversion after being absorbed by the gas at the current temperature.

Step S207: Determine a gas absorption spectrum corresponding to the current temperature according to the second electrical signal.

Step S208: Fitting a temperature and pressure compensation function for compensating gas concentration according to the current temperature and the gas absorption spectrum.

There is one absorption line in each absorption spectrum, that is, each current temperature corresponds to an absorption line, and the temperature and pressure compensation function y=f(P,T,C) is obtained by fitting multiple absorption spectra, Among them, P represents pressure, C represents concentration, and T represents temperature. The fitting process is well known to those skilled in the art and will not be described in detail here.

Step S209: Obtain gas concentration, pressure and temperature.

It can be understood that the gas concentration in this step needs to be compensated, and the pressure and temperature are respectively the pressure and temperature of the gas in the process of measuring the gas concentration to be compensated.

Step S210: Compensate the gas concentration according to the temperature and pressure compensation function, the pressure, and the temperature to obtain a compensated gas concentration.

Specifically, the gas concentration after compensation can be obtained by taking the gas concentration, pressure, and temperature into the temperature and pressure compensation functions for calculation. The compensated concentration is the data after compensation in terms of temperature and pressure, which further improves the efficiency of the compensated concentration. Accuracy.

The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments, and the same or similar parts of the various embodiments may be referred to each other. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant part can be referred to the description of the method.

Professionals may further realize that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, computer software, or a combination of the two, in order to clearly illustrate the possibilities of hardware and software. Interchangeability, the above description has generally described the components and steps of each example in terms of functionality. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Skilled artisans may implement the described functionality using different methods for each particular application, but such implementations should not be considered beyond the scope of this application.

The steps of a method or algorithm described in conjunction with the embodiments disclosed herein may be directly implemented in hardware, a software module executed by a processor, or a combination of the two. A software module can be placed in random access memory (RAM), internal memory, read only memory (ROM), electrically programmable ROM, electrically erasable programmable ROM, registers, hard disk, removable disk, CD-ROM, or any other in the technical field. in any other known form of storage medium.

The gas concentration compensation device and method provided by the present application are described in detail above. Specific examples are used herein to illustrate the principles and implementations of the present application, and the descriptions of the above embodiments are only used to help understand the methods and core ideas of the present application. It should be pointed out that for those of ordinary skill in the art, without departing from the principles of the present application, several improvements and modifications can also be made to the present application, and these improvements and modifications also fall within the protection scope of the claims of the present application.

Claims (8)

1. A gas concentration compensation apparatus, comprising:

the gas storage device is provided with windows in the first area and the second area of the side wall of the gas storage device;

the window sheet is embedded in the window;

a pressure gauge located within the gas reservoir for measuring the pressure of the gas;

a collimator located outside the first region;

the laser is connected with the collimator and used for generating laser;

the detector is positioned outside the second area and opposite to the collimator and used for receiving the laser absorbed by the gas and converting the absorbed laser into an electric signal;

and the controller is connected with the detector and used for obtaining a gas absorption spectrogram corresponding to the current pressure according to the electric signal, fitting a pressure compensation function for compensating the gas concentration according to the gas absorption spectrograms under a plurality of different pressures and compensating the gas concentration by using the pressure compensation function.

2. The gas concentration compensation apparatus of claim 1, further comprising:

the temperature control assembly is positioned on the side wall of the gas storage device and is used for adjusting the temperature of the gas;

correspondingly, the controller is also used for fitting a temperature and pressure compensation function according to the gas absorption spectrograms at a plurality of different temperatures.

3. The gas concentration compensation apparatus of claim 2, wherein the number of the temperature control assemblies is two and is symmetrical about the center of the gas storage.

4. The gas concentration compensating apparatus of claim 1, wherein the window sheet is a K9 glass sheet.

5. The gas concentration compensation apparatus of claim 1, wherein the detector is a photodiode or an avalanche photodiode.

6. The gas concentration compensation apparatus of claim 1, wherein the laser is any one of a distributed feedback semiconductor laser, a distributed bragg reflector laser, a vertical cavity surface emitting laser, an external cavity tuned semiconductor laser, a fabry-perot laser.

7. A gas concentration compensation method applied to the gas concentration compensation apparatus according to any one of claims 1 to 6, comprising:

obtaining a plurality of different current pressures measured by a pressure gauge in the gas storage;

respectively obtaining first electric signals corresponding to the current pressure, wherein the first electric signals are obtained by laser conversion after gas absorption;

determining a gas absorption spectrum corresponding to the current pressure according to the first electric signal;

fitting a pressure compensation function for compensating the gas concentration according to the current pressure and the gas absorption spectrogram;

obtaining gas concentration and pressure;

and compensating the gas concentration according to the pressure compensation function and the pressure to obtain the compensated gas concentration.

8. The gas concentration compensation method of claim 7, further comprising, before the obtaining the gas concentration:

obtaining a plurality of different current temperatures of gas in the gas storage;

respectively obtaining second electric signals corresponding to the current temperatures;

determining a gas absorption spectrogram corresponding to the current temperature according to the second electric signal;

fitting a temperature and pressure compensation function for compensating the gas concentration according to the current temperature and the gas absorption spectrogram;

accordingly, obtaining the gas concentration and pressure comprises:

obtaining gas concentration, pressure and temperature;

correspondingly, the compensating the gas concentration according to the pressure compensation function and the pressure to obtain the compensated gas concentration includes:

and compensating the gas concentration according to the temperature and pressure compensation function, the pressure and the temperature to obtain the compensated gas concentration.

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