CN114136912B - Calibration method of double-light adjustable infrared gas sensor - Google Patents
Calibration method of double-light adjustable infrared gas sensor Download PDFInfo
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- 238000000034 method Methods 0.000 title claims abstract description 35
- 238000001514 detection method Methods 0.000 claims abstract description 315
- 239000004973 liquid crystal related substance Substances 0.000 claims abstract description 30
- 239000007789 gas Substances 0.000 claims description 63
- 230000009471 action Effects 0.000 claims description 14
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 6
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- 229910052757 nitrogen Inorganic materials 0.000 claims description 3
- 238000004806 packaging method and process Methods 0.000 claims description 2
- 230000009977 dual effect Effects 0.000 claims 2
- 230000000087 stabilizing effect Effects 0.000 claims 1
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 24
- 229910002092 carbon dioxide Inorganic materials 0.000 description 12
- 239000001569 carbon dioxide Substances 0.000 description 12
- 230000003287 optical effect Effects 0.000 description 8
- 230000008569 process Effects 0.000 description 8
- 239000000306 component Substances 0.000 description 5
- 230000007613 environmental effect Effects 0.000 description 5
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- 238000005259 measurement Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 231100000572 poisoning Toxicity 0.000 description 1
- 230000000607 poisoning effect Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
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- G01N21/3504—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light for analysing gases, e.g. multi-gas analysis
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- G—PHYSICS
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
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Abstract
The application belongs to the technical field of sensors, and particularly relates to a calibration method of a double-light adjustable infrared gas sensor, wherein the double-light adjustable infrared gas sensor comprises a shell, and a liquid crystal operation screen is arranged on one side of the shell; a reflecting mirror is arranged on one side of the inner wall of the shell, a reference infrared light source is arranged on one side of the reflecting mirror, a reference filter is arranged on the other side of the reference infrared light source, a reference air chamber is arranged on the other side of the reference filter, stable gas is arranged in the reference air chamber, and a reference sensor is arranged on the other side of the reference air chamber; one side of the reference infrared light source is provided with a detection infrared light source, and the other side of the reference filter plate is provided with a detection filter plate; the device can effectively improve the working reliability, improve the detection precision simultaneously, reduce the detection difficulty, calibrate the reference infrared light source and the detection infrared light source, avoid drifting of the reference sensor and the detection sensor and ensure the stability of the detection device.
Description
Technical Field
The application belongs to the technical field of sensors, and particularly relates to a calibration method of a double-light adjustable infrared gas sensor.
Background
The infrared gas sensor detects gas concentration by utilizing an infrared principle, mainly adopts an infrared absorption type, adopts an infrared sensor as a core component, utilizes different gases to absorb different infrared wave bands, detects the gases by measuring infrared absorption wavelengths, and has the characteristics of good poisoning resistance, sensitive reaction, strong gas pertinence, long service life and strong environmental adaptability, but has a complex structure.
The Chinese patent 2014101195609 discloses a dual-light-path single-sensor gas infrared detection system and method for light path deflection, comprising a reference infrared light source, a reference air chamber, a detection air chamber, a deflection reflecting mirror, an infrared photoelectric detector and a deflection device. The deflection device drives the light source or a reflecting mirror to deflect, so that the light path is switched between the reference air chamber and the detection air chamber, the light path reaches the infrared detector in a time-sharing manner, the infrared detector compares the intensities of the optical signals detected by the front and the rear times, the common logarithm of the ratio of the two signals is used as a detection signal, and then the detection signal is converted into the gas concentration through polynomial fitting according to a calibration sample.
Meanwhile, the existing infrared gas sensor has higher requirements on the detected temperature environment, the detection precision of the infrared gas sensor can be influenced at lower or higher temperature, and the infrared gas sensor can lose the detection capability; meanwhile, the existing gas detector cannot perform environment compensation according to an actual scene, the infrared light power emitted by the infrared light source is not adjustable, the working reliability is reduced, and infrared light emitted by the reference infrared light source and the detection infrared light source can be weakened when the gas detector is used for a long time, so that the detection precision is reduced, and even the detection result is influenced; meanwhile, the reference sensor and the detection sensor drift when used for a long time, so that the subsequent detection result is influenced, the detection precision is reduced, and the like.
Disclosure of Invention
Aiming at the problems, the application provides a calibration method of a double-light adjustable infrared gas sensor, which can effectively improve the working reliability, reduce the volume and weight of the device, reduce the power consumption of the device, improve the detection precision and reduce the detection error.
In order to achieve the above purpose, the present application provides the following technical solutions: the calibration method of the double-light adjustable infrared gas sensor comprises a shell, wherein a liquid crystal operation screen is arranged on one side of the shell;
a reflecting mirror is arranged on one side of the inner wall of the shell, a reference infrared light source is arranged on one side of the reflecting mirror, a reference filter is arranged on the other side of the reference infrared light source, a reference air chamber is arranged on the other side of the reference filter, stable gas is arranged in the reference air chamber, and a reference sensor is arranged on the other side of the reference air chamber;
one side of the reference infrared light source is provided with a detection infrared light source, one side of the detection infrared light source far away from the reflecting mirror is provided with a detection filter, the other side of the detection filter is provided with a detection air chamber, and the other side of the detection air chamber is provided with a detection sensor;
a first refraction sheet is arranged between the reference infrared light source and the reference filter, and a second refraction sheet is arranged between the reference air chamber and the reference sensor;
the detection infrared light source, the detection filter, the detection air chamber and the detection sensor are symmetrically distributed with the reference infrared light source, the reference filter, the reference air chamber and the reference sensor along the central axis of the reflecting mirror, and the working wavelengths of the reference filter and the detection filter are different;
the reference sensor and the detection sensor are electrically connected with an amplifier at one side far away from the second refraction sheet, and an arithmetic unit is electrically connected with the other side of the amplifier;
an air inlet and an air outlet are respectively arranged on one side of the detection air chamber, and both the air inlet and the air outlet penetrate through the shell to be communicated with the outside;
the first refraction sheet and the second refraction sheet are respectively provided with a rotation module, and the rotation modules adjust the refraction angles of the first refraction sheet and the second refraction sheet;
when the first refraction sheet rotates, infrared light emitted by the reference infrared light source reaches the detection filter sheet under the refraction action of the first refraction sheet; when the second refraction sheet rotates, the infrared light emitted by the infrared detection light source reaches the detection sensor under the refraction action of the second refraction sheet.
Compared with the prior art, the application has the following beneficial effects:
according to the application, the reference infrared light source, the air chamber, the reflecting mirror, the reference filter, the reference sensor, the detection filter, the detection sensor and other components are mutually matched, so that the problems of low detection precision and the like are jointly solved, infrared light emitted by the reference infrared light source and the detection infrared light source reaches the reference filter and the detection filter through reflection of the reflecting mirror, the reference filter and the detection filter reach the reference air chamber and the detection air chamber, the infrared light is transmitted to the reference sensor and the detection sensor through filtering action of the reference filter and the detection filter, the optical signal is finally converted into an electric signal for subsequent analysis processing, the power consumption is reduced, the energy is saved, the detection precision can be effectively improved through comparison of the reference sensor and the detection sensor, the detection error is reduced, and the influence of sensor drift on the detection result can be effectively avoided.
According to the application, the components such as the reference infrared light source, the air chamber, the reference filter, the reference sensor, the detection filter, the detection sensor, the amplifier, the processor and the liquid crystal operation screen are mutually matched, so that the problems of gas concentration detection precision and conversion are solved together, the infrared light passing through the air chamber reaches the reference sensor and the detection sensor, the optical signal is converted into an electric signal, the electric signal is amplified and then transmitted to the converter, and the electric signal is converted and then reaches the liquid crystal operation screen for display through the processor and the driving circuit.
The application solves the problem of weakness of infrared light emitted by the reference infrared light source or the detection infrared light source by arranging the reference infrared light source, the detection infrared light source, the first refraction sheet and other components to be matched, when the detection value detected by the reference sensor is not equal to the set value, the reference infrared light source or the reference sensor is indicated to be damaged, the rotation module drives the first refraction sheet to rotate, the infrared light emitted by the reference infrared light source reaches the detection sensor, when the detection values are the same, the reference sensor is indicated to be damaged, and when the detection values are different, the reference infrared light source is indicated to be damaged; the same calibration process of detecting the infrared light source is carried out in the same way, the device can correct the reference infrared light source and the detecting infrared light source, the stability of the reference infrared light source and the detecting infrared light source is ensured on the premise that the detection efficiency is improved by using double light sources, the detection precision of the device is further improved, and the accuracy of data is ensured.
According to the application, the reference sensor, the detection sensor, the second refraction sheet and other components are mutually matched, so that the problem that the reference sensor and the detection sensor drift is solved together.
Drawings
FIG. 1 is a schematic diagram of the structure of the present application;
FIG. 2 is a schematic elevational cross-sectional view of the present application;
FIG. 3 is a flow chart of a first embodiment of the present application;
FIG. 4 is a flow chart of a second embodiment of the present application;
fig. 5 is a schematic flow chart of a third embodiment of the present application.
Reference numerals: 1. a housing; 2. a reference infrared light source; 3. detecting an infrared light source; 4. a reference filter; 5. a reference sensor; 6. detecting a filter; 7. a detection sensor; 8. an amplifier; 9. an arithmetic unit; 10. an air inlet; 11. an exhaust port; 12. a liquid crystal operation panel; 13. a reflecting mirror; 14. a first refraction sheet; 15. a reference air chamber; 16. detecting an air chamber; 17. a temperature control module; 18. and a second refraction sheet.
Description of the embodiments
The following description of the embodiments of the present application will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present application, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
Examples
As shown in fig. 1-3, the calibration method of the dual-light adjustable infrared gas sensor takes carbon dioxide gas detection as an example, the dual-light adjustable infrared gas sensor comprises a shell 1, a liquid crystal operation screen 12 is arranged on one side of the shell 1, the liquid crystal operation screen 12 electrically controls various electric elements, the liquid crystal operation screen 12 has a control function, and meanwhile, the liquid crystal operation screen 12 is positioned on the outer surface of the shell 1, so that the calibration method also has the effect of a display screen, and is convenient for a user to read data and control operation in the detection process.
The inner wall of the shell 1 is provided with a reflecting mirror 13, one side of the reflecting mirror 13 is provided with a reference infrared light source 2, the reference infrared light source 2 is used as an optical probe to detect carbon dioxide gas, and the reflecting mirror 13 has a reflecting function and can reflect infrared light emitted by the reference infrared light source 2 so as to ensure that the infrared light can be detected subsequently.
The other side of the reference infrared light source 2 is provided with a reference filter 4, the other side of the reference filter 4 is provided with a reference air chamber 15, stable gas is arranged in the reference air chamber 15, the stable gas is nitrogen, the other side of the reference air chamber 15 is provided with a reference sensor 5, infrared light emitted by the reference infrared light source 2 reaches the reference air chamber 15 along the reference filter 4, gas refraction is carried out in the reference air chamber 15, and finally gas detection is carried out along the reference air chamber 15 to reach the reference sensor 5, so that a gas reference value is obtained.
One side of the reference infrared light source 2 is provided with a detection infrared light source 3, one side of the detection infrared light source 3 far away from the reflecting mirror 13 is provided with a detection filter 6, the other side of the detection filter 6 is provided with a detection air chamber 16, and the other side of the detection air chamber 16 is provided with a detection sensor 7; correspondingly, the infrared light emitted by the infrared light source 3 reaches the detection air chamber 16 along the detection filter 6, gas refraction is performed in the detection air chamber 16, and finally gas detection is performed along the detection air chamber 16 to the detection sensor 7, so as to obtain a gas detection value.
In order to fully utilize light energy, the optical probe of the infrared gas detector is required to be provided with a reference air chamber 15 and a detection air chamber 16, when in measurement, infrared light emitted by the reference infrared light source 2 or the detection infrared light source 3 is filtered by the reference filter 4 or the detection filter 6, and then the infrared light passes through the reference air chamber 15 or the detection air chamber 16 and irradiates into the reference sensor 5 or the detection sensor 7, so that a subsequent gas detection process is carried out, wherein the reference sensor 5 and the detection sensor 7 can convert the infrared light into electric signals, and subsequent data calculation and display are facilitated.
The detection infrared light source 3, the detection filter 6, the detection air chamber 16 and the detection sensor 7 are symmetrically distributed with the reference infrared light source 2, the reference filter 4, the reference air chamber 15 and the reference sensor 5 along the central axis of the reflecting mirror 13, and the symmetrical distribution mode effectively improves the detection precision and ensures the rationality of the detection result.
As is clear from the above, the reference filter 4 and the detection filter 6 have different wavelengths, wherein the reference filter 4 has an operating wavelength of 4um, the detection filter 6 has an operating wavelength of 4.26um, the 4.26um wavelength is an absorption wavelength of carbon dioxide gas, the 4um wavelength is a transmission wavelength which is a completely non-absorption wavelength of carbon dioxide gas, and the reference sensor 5 and the detection sensor 7 have the same basic components, but the detected infrared light has different wavelengths, so that the displayed data are different.
The reference infrared light source 2, the reference filter 4, the reference air chamber 15 and the reference sensor 5 are positioned on the same horizontal line, and the detection infrared light source 3, the detection filter 6, the detection air chamber 16 and the detection sensor 7 are positioned on the same horizontal line, so that the infrared light reflected by the reflecting mirror 13 can uniformly reach the filter, reach the air chamber after passing through the filter, and reach the air sensor after passing through the air chamber for detection.
The reference sensor 5 and the detection sensor 7 are electrically connected with the amplifier 8 on one side far away from the reference air chamber 15 and the detection air chamber 16, the amplifier 8 can amplify the detection electric signal so as to facilitate subsequent reading of the electric signal, the arithmetic unit 9 is electrically connected with the other side of the amplifier 8, the arithmetic unit 9 comprises a converter, a processor and a driving circuit, the arithmetic unit 9 presents an operation result on the screen of the liquid crystal operation screen 12, and data transmitted by the amplifier 8 are transmitted and calculated through a series of operations of the arithmetic unit 9, so that subsequent display on the liquid crystal operation screen 12 is facilitated.
The detection air chamber 16 is provided with an air inlet 10 and an air outlet 11 at one side thereof, and the air inlet 10 and the air outlet 11 are communicated with the outside through the housing 1, so that the outside air can enter the detection air chamber 16 along the air inlet 10 and be discharged from the air outlet 11 after a series of operations are performed in the detection air chamber 16.
The parabolic reflector plate is arranged on one side, far away from the reflector 13, of the reference infrared light source 2 and the detection infrared light source 3, and adopts a windowless packaging mode, so that the edge loss of light emitted by the reference infrared light source 2 and the detection infrared light source 3 is minimum, the utilization rate of the reference infrared light source 2 and the detection infrared light source 3 is effectively improved, and random divergence of the reference infrared light source 2 and the detection infrared light source 3 is avoided, and the detection accuracy is reduced.
The roughness of the inner walls of the reference air cell 15 and the detection air cell 16 is less than 0.04, and the inner walls of the reference air cell 15 and the detection air cell 16 are very smooth so that the degree of reflection of the infrared light of the reference infrared light source 2 and the detection infrared light source 3 is greater, further improving the intensity of the infrared light irradiated on the reference sensor 5 and the detection sensor 7.
The inside control by temperature change module 17 that is equipped with of shell 1, control by temperature change module 17 adjusts the inside temperature of shell 1 to guarantee that the inside temperature of shell 1 is in required temperature, and then guarantee the accuracy to gas detection, the inside environmental compensation module that is equipped with of shell 1 can compensate this gas sensor's service environment through environmental compensation module, thereby guarantee the accuracy that this gas sensor used.
The reference infrared light source 2 and the detection infrared light source 3 are electrically connected with a power adjusting module, and the power adjusting module adjusts the transmitting power of infrared light of the reference infrared light source 2 and the detection infrared light source 3, so that the power adjustable performance of the reference infrared light source 2 and the detection infrared light source 3 is realized, the detection range is enlarged, and the detection precision is ensured.
The structure of the reference infrared light source 2 is the same as that of the detection infrared light source 3, and the structure of the reference sensor 5 is the same as that of the detection sensor 7, so that the detection accuracy is ensured, and the detection deviation caused by the difference of the infrared light sources or the sensors is avoided.
When the device is used, the device is placed in a carbon dioxide gas environment to be detected, the device is operated through the liquid crystal operation screen 12, at the moment, the reference infrared light source 2 and the detection infrared light source 3 are simultaneously started, the reference infrared light source 2 emits infrared light to the reflecting mirror 13, the infrared light is reflected to the reference filter 4 through the reflecting mirror 13 and passes through the reference filter 4 to reach the reference air chamber 15, stable carbon dioxide gas nitrogen exists in the reference air chamber 15, the infrared light passes through the reference air chamber 15 to reach the reference sensor 5, and the reference sensor 5 converts the optical signal into an electric signal, so that the subsequent analysis and presentation of data are convenient.
Similarly, the infrared light emitted by the infrared light source 3 passes through the detection filter 6 and the detection air chamber 16 in sequence after being reflected by the reflecting mirror 13, then reaches the detection sensor 7, and the external carbon dioxide gas enters the detection air chamber 16 along the air inlet 10 and is discharged along the air outlet 11 to form a flowing environment, so that the carbon dioxide gas in the environment is detected, and the detection sensor 7 converts the optical signal into an electric signal, thereby being convenient for the subsequent analysis and presentation of the data.
Because the working wavelengths of the reference filter 4 and the detection filter 6 are different, the filtering effect on the carbon dioxide gas is different, the optical signals reaching the reference sensor 5 and the detection sensor 7 are different, the electric signal results transmitted by the reference sensor 5 and the detection sensor 7 are different, and the concentration of the carbon dioxide gas can be effectively obtained by comparing the electric signal results output by the reference sensor 5 and the detection sensor 7.
The reference detection electric signals and the detection electric signals output by the reference sensor 5 and the detection sensor 7 are amplified by the amplifier 8, the amplified two paths of analog electric signals are converted into two paths of digital voltage signals by the converter, the two paths of digital voltage signals are converted into a processor to be digitally processed, the electric signals carrying the concentration information of the detected carbon dioxide gas after being processed by the processor are driven by the driving circuit and reach the liquid crystal operation screen 12, and the concentration result is displayed in a display in the liquid crystal operation screen 12, so that a user can conveniently acquire the concentration of the carbon dioxide gas in the space.
And the temperature inside the shell 1 can be adjusted through the temperature control module 17, so that the detection temperature of the calibration method of the double-light adjustable infrared gas sensor is ensured to be in a required temperature range, meanwhile, the environment compensation module ensures that the detection environment of the calibration method of the double-light adjustable infrared gas sensor is in a required environment, the detection precision is further ensured, the detection accuracy is improved, and the power of the reference infrared light source 2 and the power of the detection infrared light source 3 are adjusted through the power adjustment module, so that the optimal infrared light emission frequency is obtained, the detection ranges of the reference infrared light source 2 and the detection infrared light source 3 are improved, and the detection precision is ensured.
The device acquires the concentration of the detected gas in the environment space by means of the detection infrared light source 3 and the detection sensor 7, and carries out reference comparison on the data by the reference infrared light source 2 and the reference sensor 5, so that the working reliability is effectively improved, the detection precision can be effectively improved by the comparison of the reference sensor 5 and the detection sensor 7, the detection error is reduced, and the influence of sensor drift on the detection result is avoided.
Similarly, the device realizes temperature regulation and environmental compensation inside the housing 1, ensures the temperature and environmental requirements required by detection of the reference sensor 5 and the detection sensor 7, further improves the detection precision, can effectively improve the detection range through the power adjustable module, improves the adaptability of the device, and obtains the best detection result.
Examples
As shown in fig. 4, in the calibration method of the dual-light adjustable infrared gas sensor according to the first embodiment, when the dual-light adjustable infrared gas sensor is used for a long time, the reference infrared light source 2 and the detection infrared light source 3 decay, so as to affect the detection result, in order to solve the problem, improve the detection precision, and avoid the problem of reduced precision caused by long-time use, the calibration method of the dual-light adjustable infrared gas sensor further includes: a first refraction sheet 14 is arranged between the reference infrared light source 2 and the reference filter 4, and a second refraction sheet 18 is arranged between the reference air chamber 15 and the reference sensor 5; the first refraction piece 14 and the second refraction piece 18 are respectively provided with a rotation module, the rotation modules adjust the refraction angles of the first refraction piece 14 and the second refraction piece 18, therefore, under normal use, infrared light emitted by the infrared light source 3 is detected to reach the detection filter 6 and the detection air chamber 16 through reflection of the reflecting mirror 13, when the rotation modules drive the first refraction piece 14 to rotate, the infrared light emitted by the infrared light source 3 is detected to reach the reference filter 4 and the reference air chamber 15 after being reflected by the reflecting mirror 13, and the same process is carried out on the reference infrared light source 2, and through the process, the calibration process of the reference infrared light source 2 and the detection infrared light source 3 can be realized, so that the detection accuracy is improved.
Similarly, due to the relative stability of the reference air chamber 15 and the reference sensor 5, when the emission frequencies of the reference infrared light source 2 and the detection infrared light source 3 are changed during detection, the signal of the infrared light detected by the reference sensor 5 should be a certain value, and the value can be obtained through multiple tests, which is not described again.
In use, as can be seen from the first embodiment, the infrared light emitted by the reference infrared light source 2 sequentially passes through the reflecting mirror 13, the reference filter 4 and the reference air chamber 15 to reach the reference sensor 5, while the infrared light emitted by the detection infrared light source 3 sequentially passes through the reflecting mirror 13, the detection filter 6 and the detection air chamber 16 to reach the detection sensor 7, and the gas data in the environment are obtained through comparison of the two detection results.
After the device is turned on, in order to ensure the stability of the reference infrared light source 2 and the detection infrared light source 3, and avoid the influence on the detection result caused by the occurrence of a weak deviation of the infrared light emitted by the reference infrared light source 2 or the detection infrared light source 3, when the frequency of the infrared light emitted by the reference infrared light source 2 or the detection infrared light source 3 is fixed, the signal of the infrared light detected by the reference sensor 5 should be a fixed value, and the fixed value is known, and at this time, the reference sensor 5 can detect whether the infrared light signal emitted by the reference infrared light source 2 is the fixed value.
When the infrared light signal emitted by the reference infrared light source 2 detected by the reference sensor 5 is the fixed value, the reference infrared light source 2 is closed, the liquid crystal operation screen 12 controls the rotation of the first refraction sheet 14, at the moment, the infrared light emitted by the detected infrared light source 3 can reach the first refraction sheet 14 after being reflected by the reflection mirror 13 and reach the reference filter 4 under the refraction effect of the first refraction sheet 14, the infrared light passes through the reference filter 4 to reach the reference air chamber 15, and further reaches the reference sensor 5 through the reference air chamber 15 to detect the infrared light of the reference air chamber, and if the infrared light signal emitted by the detected infrared light source 3 detected by the reference sensor 5 is still the fixed value, the device is good, and the reference infrared light source 2 and the detected infrared light source 3 are not problematic.
When the infrared light signal emitted by the infrared light detecting source 3 detected by the reference sensor 5 is not equal to the fixed value, it is indicated that the problem occurs in the infrared light detecting source 3, and the infrared light detecting source 3 needs to be detected and maintained or replaced in time so as to prevent the influence on the subsequent detection.
When the data of the infrared light emitted by the reference infrared light source 2 detected by the reference sensor 5 is not equal to the fixed value, various situations occur, the first is that the reference infrared light source 2 is damaged, and the second is that the reference sensor 5 is damaged, so that analysis is needed for the two situations.
The infrared light emitted by the infrared light detection source 3 sequentially passes through the reflecting mirror 13, the detection filter plate 6 and the detection air chamber 16 to reach the detection sensor 7 for detection, and a detection value is obtained, at this moment, the rotation module drives the first refraction sheet 14 to reversely rotate, the infrared light detection source 3 is closed, the infrared light emitted by the reference infrared light source 2 can reach the first refraction sheet 14 after being reflected by the reflecting mirror 13 and reach the detection filter plate 6 under the refraction action of the first refraction sheet 14, and the infrared light passes through the detection filter plate 6 to reach the detection air chamber 16 and further reaches the detection sensor 7 through the detection air chamber 16 for detecting the infrared light.
When the two infrared light data detected by the detection sensor 7 are the same, it is indicated that the infrared signals emitted by the reference infrared light source 2 and the detection infrared light source 3 are the same, and further it is indicated that the detection infrared light source 3 is not damaged, and if the reference sensor 5 is damaged, the user needs to be prompted on the liquid crystal operation screen 12 at the first time to replace the reference sensor 5.
When the two infrared light data detected by the detection sensor 7 are different, it is indicated that the infrared signals emitted by the reference infrared light source 2 and the detection infrared light source 3 are different, and further it is indicated that the detection infrared light source 3 is damaged, and the detection infrared light source 3 needs to be replaced.
The device can correct the reference infrared light source 2 and the detection infrared light source 3, and under the premise of improving the detection efficiency by using double light sources, the stability of the reference infrared light source 2 and the detection infrared light source 3 is ensured, the detection precision of the device is further improved, and the accuracy of data is ensured.
Examples
As shown in fig. 5, when the sensor is used for a long time, the reference sensor 5 and the detection sensor 7 drift, and the reference air cell 15 and the detection air cell 16 also have a problem of a decrease in detection accuracy, so that the detection accuracy is improved to solve the above problem.
Because the detection sensor 7 can drift when long-time use occurs, then the infrared light emitted by the detection infrared light source 3 sequentially passes through the reflecting mirror 13, the detection filter plate 6 and the detection air chamber 16 to reach the inside of the detection sensor 7 to be detected, so as to obtain a first detection value, when the device starts to use, the liquid crystal operation screen 12 controls the reference infrared light source 2 to be closed, the rotation module drives the second refraction sheet 18 to rotate, and then the infrared light emitted by the detection infrared light source 3 sequentially passes through the reflecting mirror 13 and the detection filter plate 6 to reach the detection air chamber 16, and then reaches the reference sensor 5 under the refraction action of the second refraction sheet 18 to detect the infrared light so as to obtain a second detection value.
When the second detection value is equal to the first detection value, the detection sensor 7 is not in a problem, the device is in a stable detection environment, the problems do not occur in all parts, and the detection precision reaches the required requirement; when the second detection value is not equal to the first detection value, two conditions can occur, and the first condition is that the detection sensor 7 has drift, and the liquid crystal operation screen 12 is required to remind the user, so that the detection sensor 7 is replaced.
The second is that the reference sensor 5 and the detection sensor 7 drift simultaneously, and the reference sensor 5 needs to be calibrated.
The infrared light emitted by the reference infrared light source 2 sequentially passes through the reflecting mirror 13, the reference filter 4 and the reference air chamber 15 to reach the reference sensor 5, and the detection data of the reference sensor 5 should be a certain value, namely the above-mentioned fixed value, when the detection value is equal to the fixed value, it is indicated that the reference sensor 5 has no problem, and the required calibration performance is provided, namely the condition that the above-mentioned reference sensor 5 and the detection sensor 7 drift simultaneously does not exist.
When the infrared light data detected by the reference sensor 5 is not equal to the fixed value, the liquid crystal operation screen 12 controls the second refraction sheet 18 to rotate reversely, and controls the detection infrared light source 3 to be turned off, the infrared light emitted by the reference infrared light source 2 sequentially passes through the reflecting mirror 13, the reference filter 4 and the reference air chamber 15, passes through the reference air chamber 15 and then reaches the detection sensor 7 under the refraction action of the second refraction sheet 18, the detection sensor 7 detects the infrared light emitted by the reference infrared light source 2, when the detection value is equal to the set fixed value, the reference air chamber 15 is indicated to not have a problem, but the reference sensor 5 drifts, a user is reminded at the first time on the liquid crystal operation screen 12, so that the reference sensor 5 is maintained and replaced, and the influence on the subsequent detection result is avoided.
When the detected value is not equal to the set value, it is indicated that the reference air chamber 15 has a problem, and further, the user is required to be reminded of maintaining and adjusting the reference air chamber 15 through the liquid crystal operation screen 12, so that the reference calibration accuracy of the reference air chamber 15 is ensured.
The device can calibrate and compare the detection sensor 7 and the reference sensor 5, timely acquire whether the detection sensor 7 and the reference sensor 5 drift, improve detection precision, and ensure detection quality.
It is noted that relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
Although embodiments of the present application have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the application, the scope of which is defined in the appended claims and their equivalents.
Claims (10)
1. The calibrating method of the double-light adjustable infrared gas sensor comprises a shell, and is characterized in that a liquid crystal operation screen is arranged on one side of the shell; a reflecting mirror is arranged on one side of the inner wall of the shell, a reference infrared light source is arranged on one side of the reflecting mirror, a reference filter is arranged on the other side of the reference infrared light source, a reference air chamber is arranged on the other side of the reference filter, stable gas is arranged in the reference air chamber, and a reference sensor is arranged on the other side of the reference air chamber; one side of the reference infrared light source is provided with a detection infrared light source, one side of the detection infrared light source far away from the reflecting mirror is provided with a detection filter, the other side of the detection filter is provided with a detection air chamber, and the other side of the detection air chamber is provided with a detection sensor; a first refraction sheet is arranged between the reference infrared light source and the reference filter, and a second refraction sheet is arranged between the reference air chamber and the reference sensor; the detection infrared light source, the detection filter, the detection air chamber and the detection sensor are symmetrically distributed with the reference infrared light source, the reference filter, the reference air chamber and the reference sensor along the central axis of the reflecting mirror, and the working wavelengths of the reference filter and the detection filter are different; the reference sensor and the detection sensor are electrically connected with an amplifier at one side far away from the second refraction sheet, and an arithmetic unit is electrically connected with the other side of the amplifier; an air inlet and an air outlet are respectively arranged on one side of the detection air chamber, and both the air inlet and the air outlet penetrate through the shell to be communicated with the outside; the first refraction sheet and the second refraction sheet are respectively provided with a rotation module, and the rotation modules adjust the refraction angles of the first refraction sheet and the second refraction sheet;
when the first refraction sheet rotates, infrared light emitted by the reference infrared light source reaches the detection filter sheet under the refraction action of the first refraction sheet; when the second refraction sheet rotates, the infrared light emitted by the infrared detection light source reaches the detection sensor under the refraction action of the second refraction sheet;
the calibration method comprises the following steps:
1) The infrared light emitted by the infrared light detection source sequentially passes through the reflector, the detection filter and the detection air chamber to reach the inside of the detection detector for detection to obtain a first detection value, when the device starts to be used, the liquid crystal operation panel controls the reference infrared light source to be closed, the rotation module drives the second refraction sheet to rotate, and then the infrared light emitted by the infrared light detection source sequentially passes through the reflector and the detection filter to reach the detection air chamber and then reaches the reference detector under the refraction effect of the second refraction sheet for detection to obtain a second detection value;
2) When the second detection value is equal to the first detection value, the device is in a stable detection environment and has no problem in each part, and the detection precision reaches the required requirement;
3) When the second detection value is not equal to the first detection value, two conditions can occur;
a) Firstly, when the detection detector drifts, a user needs to be reminded on the liquid crystal operation screen, so that the detection detector is replaced;
b) The second method is that the reference detector and the detection detector drift simultaneously, and the reference detector needs to be calibrated;
4) The infrared light emitted by the reference infrared light source sequentially passes through the reflector, the reference filter and the reference air chamber to reach the reference detector to obtain a detection value, and the detection data of the reference detector is a certain value due to the stability of the reference air chamber;
a) When the detection value is equal to the fixed value, the reference detector is free from problems, and the required calibration performance is achieved, namely the condition that the reference detector and the detection detector drift at the same time is avoided;
b) When the infrared light data detected by the reference detector is not equal to the fixed value, the liquid crystal operation screen controls the second refraction sheet to rotate reversely, and controls the detection infrared light source to be closed, so that the infrared light emitted by the reference infrared light source sequentially passes through the reflector, the reference filter and the reference air chamber and reaches the detection detector under the refraction action of the second refraction sheet after passing through the reference air chamber, and the detection detector detects the infrared light emitted by the reference infrared light source;
c) When the detection value is equal to the fixed value, the reference air chamber is not problematic, but the reference detector is drifting, and then the user is reminded at the first time on the liquid crystal operation screen;
d) When the detection value is not equal to the fixed value, the problem of the reference air chamber is indicated, and then a user is reminded to maintain and adjust the reference air chamber through the liquid crystal operation screen;
5) When the frequency of the infrared light emitted by the reference infrared light source or the detection infrared light source is fixed, the signal of the infrared light detected by the reference sensor is a certain value, and the fixed value is known, and at the moment, the reference sensor detects whether the signal of the infrared light emitted by the reference infrared light source is the fixed value; when the infrared light signal emitted by the reference infrared light source detected by the reference sensor is the fixed value, the reference infrared light source is turned off, the liquid crystal operation screen controls the rotation of the first refraction sheet, and the infrared light emitted by the detected infrared light source can reach the first refraction sheet after being reflected by the reflector and reach the reference filter sheet under the refraction action of the first refraction sheet; the infrared light passes through the reference filter to reach the reference air chamber, and reaches the reference sensor through the reference air chamber to detect the infrared light, and if the infrared light signal emitted by the infrared light source detected by the reference sensor is still the fixed value, the problem of the reference infrared light source and the infrared light source is not detected;
6) When the infrared light signal emitted by the infrared light source detected by the reference sensor is unequal to the fixed value, the problem of the infrared light source is detected;
7) When the data of the infrared light emitted by the reference infrared light source detected by the reference sensor is not equal to the fixed value:
a) The infrared light emitted by the infrared light source is detected in the detection sensor through the reflector, the detection filter and the detection air chamber in sequence, and a detection value is obtained, at the moment, the rotation module drives the first refraction sheet to reversely rotate, the infrared light source is turned off, the infrared light emitted by the reference infrared light source can reach the first refraction sheet after being reflected by the reflector and reaches the detection filter under the refraction action of the first refraction sheet, and the infrared light passes through the detection filter to reach the detection air chamber and reaches the detection sensor through the detection air chamber to detect the infrared light; when the two infrared light data detected by the detection sensor are the same, the infrared signals emitted by the reference infrared light source and the detection infrared light source are the same, and the infrared light source is further proved to be damaged if the detection infrared light source is not damaged;
b) When the two infrared light data detected by the detection sensor are different, the infrared signals emitted by the reference infrared light source and the detection infrared light source are different, and further the detection infrared light source is further described as damaged.
2. The calibration method of the dual-light adjustable infrared gas sensor according to claim 1, wherein the reference infrared light source and the detection infrared light source are respectively provided with a parabolic reflector at one side far away from the reflector, and the parabolic reflectors adopt a windowless packaging mode to minimize edge loss of light emitted by the reference infrared light source and the detection infrared light source.
3. The calibration method of the dual-light adjustable infrared gas sensor according to claim 2, wherein the roughness of the inner walls of the reference air chamber and the detection air chamber is less than 0.04, and the inner walls of the reference air chamber and the detection air chamber are smooth and can reflect infrared light of the reference infrared light source and the detection infrared light source to the greatest extent.
4. A method of calibrating a dual light adjustable infrared gas sensor according to claim 3, wherein the liquid crystal operation panel electrically controls each electrical component.
5. The method according to claim 4, wherein the arithmetic unit includes a converter, a processor, and a driving circuit, and the arithmetic unit presents the result of the operation at the liquid crystal operation panel.
6. The method for calibrating a dual-light adjustable infrared gas sensor according to claim 5, wherein the reference infrared light source, the reference filter, the reference air chamber and the reference sensor are positioned on the same horizontal line, and the detection infrared light source, the detection filter, the detection air chamber and the detection sensor are positioned on the same horizontal line.
7. The method of calibrating a dual light adjustable infrared gas sensor of claim 6, wherein the stabilizing gas is nitrogen.
8. The method for calibrating a dual-light adjustable infrared gas sensor according to claim 7, wherein a temperature control module is arranged in the shell, the temperature control module adjusts the temperature in the shell, and an environment compensation module is arranged in the shell.
9. The method for calibrating a dual-light adjustable infrared gas sensor according to claim 8, wherein the reference infrared light source and the detection infrared light source are electrically connected with a power adjustment module, and the power adjustment module adjusts the emission power of infrared light of the reference infrared light source and the detection infrared light source.
10. The method for calibrating a dual-light adjustable infrared gas sensor according to claim 9, wherein the reference infrared light source and the detection infrared light source have the same structure, and the reference sensor and the detection sensor have the same structure.
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