CN112345528A - Gas analysis device with automatic calibration function and calibration method - Google Patents
Gas analysis device with automatic calibration function and calibration method Download PDFInfo
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- CN112345528A CN112345528A CN202011294874.4A CN202011294874A CN112345528A CN 112345528 A CN112345528 A CN 112345528A CN 202011294874 A CN202011294874 A CN 202011294874A CN 112345528 A CN112345528 A CN 112345528A
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- gas
- laser
- gas chamber
- control circuit
- standard gas
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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
- G01N21/84—Systems specially adapted for particular applications
- G01N21/85—Investigating moving fluids or granular solids
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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
- G01N21/27—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands using photo-electric detection ; circuits for computing concentration
- G01N21/274—Calibration, base line adjustment, drift correction
- G01N21/276—Calibration, base line adjustment, drift correction with alternation of sample and standard in optical path
-
- 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
- G01N21/84—Systems specially adapted for particular applications
- G01N21/85—Investigating moving fluids or granular solids
- G01N2021/8578—Gaseous flow
Abstract
The invention discloses a gas analysis device with an automatic calibration function and a calibration method, wherein the calibration method comprises the following steps: the gas chamber component comprises a driving circuit, a laser, a gas chamber component, a detector, an amplifying circuit and a control circuit which are sequentially and electrically connected; the gas chamber assembly comprises a measured gas pool and at least one standard gas chamber which are connected in parallel, and the light path of the measured gas pool and the light paths of all the standard gas chambers are connected with optical switches; when calibration is needed, the control circuit controls the drive circuit to output signals to the laser, the laser emits laser to the standard gas chamber, the detector converts optical signals into electric signals, and the electric signals are amplified by the amplifying circuit and then enter the control circuit; the control circuit calibrates the electric signal according to the known concentration and the measurement signal of the standard gas; wherein multi-point calibration can be achieved when using multi-standard gas chambers.
Description
Technical Field
The invention relates to the technical field of gas analysis, in particular to a gas analysis device with an automatic calibration function and a calibration method.
Background
The existing gas analyzer needs to be calibrated by using standard gas in a gas pool before the concentration of the measured gas is measured so as to correct the error of the analyzer; after correction, the concentration of the gas to be measured is measured. However, the method wastes labor, and is easy to cause environmental pollution due to frequent use of standard gas.
Disclosure of Invention
In view of the above problems in the prior art, the present invention provides a gas analyzer with an automatic calibration function and a calibration method.
The invention discloses a gas analysis device with an automatic calibration function, which comprises: the gas chamber component comprises a driving circuit, a laser, a gas chamber component, a detector, an amplifying circuit and a control circuit which are sequentially and electrically connected;
the gas chamber assembly comprises a measured gas cell and at least one standard gas chamber which are connected in parallel, and the light path of the measured gas cell and the light paths of all the standard gas chambers are connected with optical switches.
As a further improvement of the invention, the gas chamber assembly comprises a measured gas cell and at least one standard gas chamber connected in parallel;
the laser input end of the measured gas pool and the laser input ends of all the standard gas chambers are correspondingly connected with the beam splitting end of a beam splitting optical fiber, and the beam combining end of the beam splitting optical fiber is connected with the output end of the laser;
and the laser output end of the detected gas pool and the laser output ends of all the standard gas chambers are correspondingly connected with the beam splitting end of the beam combining optical fiber, and the beam combining end of the beam combining optical fiber is connected with the detector.
As a further improvement of the invention, the gas cell to be measured comprises a plurality of groups of reflectors, and the reflectors are arranged on the reflector base; the reflecting mirror is used for realizing multiple reflection of the laser in the gas pool to be detected.
As a further development of the invention, the standard gas chamber is filled with a gas of known concentration for the purpose of carrying out a multipoint calibration of the gas analysis device.
As a further improvement of the invention, the standard gas chamber comprises a gas chamber wall and a lens which is arranged at two ends of the gas chamber wall and can transmit light, and gas with known concentration is filled in the gas chamber formed by the gas chamber wall and the lens.
The invention also discloses a calibration method of the gas analysis device, which comprises the following steps:
when the normal work is carried out:
the control circuit controls the optical switch of the gas cell to be measured to be connected, other optical switches to be disconnected and controls the driving circuit to output signals to the laser, the laser emits laser, the laser passes through the beam splitting optical fiber to the gas cell to be measured, then the signals reach the detector through the beam combining optical fiber, the detector converts the optical signals into electric signals, the electric signals are amplified by the amplifying circuit and then enter the control circuit, and the measurement of the concentration of the gas to be measured is completed;
when a point calibration is required:
the control circuit controls the optical switch of a standard gas chamber to be communicated, the other optical switches to be disconnected and controls the driving circuit to output signals to the laser, the laser emits laser, the laser passes through the beam splitting optical fiber to reach the standard gas chamber, then the signals reach the detector through the beam combining optical fiber, the detector converts the optical signals into electric signals, and the electric signals are amplified by the amplifying circuit and then enter the control circuit; the control circuit calibrates the electric signal according to the known concentration and the measurement signal of the standard gas, and realizes one-point calibration.
As a further improvement of the present invention, when multi-point calibration is required, the method further comprises:
the control circuit sequentially controls the optical switch of the other standard gas chamber to be connected, the other optical switches to be disconnected and controls the driving circuit to output signals to the laser, the laser emits laser, the laser passes through the beam splitting optical fiber to the standard gas chamber, then the signals reach the detector after being combined, the detector converts the optical signals into electric signals, and the electric signals are amplified by the amplifying circuit and then enter the control circuit; the control circuit calibrates the electric signal according to the known concentration and the measurement signal of the standard gas, and multi-point calibration is realized.
Compared with the prior art, the invention has the beneficial effects that:
the invention can switch the light path to the standard gas chamber by controlling the optical switch to realize automatic calibration, thereby reducing the workload of a calibration instrument and the use amount of the standard gas, and further reducing the pollution to the environment; meanwhile, the invention can realize multi-point calibration of the gas analysis device according to different concentrations of a plurality of standard gas chambers.
Drawings
FIG. 1 is a schematic structural diagram of a gas analyzer with an automatic calibration function according to an embodiment of the present invention;
FIG. 2 is a schematic view of the internal structure of the gas cell under test in FIG. 1;
fig. 3 is a schematic structural view of the first standard gas chamber or the second standard gas chamber in fig. 1.
In the figure:
1. a measured gas pool; 1-1, a reflector; 1-2, a reflector base; 2. a first standard gas chamber; 2-1, a lens; 2-2, the wall of the air chamber; 2-3, internal gas; 3. a second standard gas chamber; 4. a first optical switch; 5. a second optical switch; 6. a third optical switch; 7. a laser; 8. a drive circuit; 9. a control circuit; 10. an amplifying circuit; 11. a detector; 12. a beam splitting optical fiber; 13. and (4) combining the optical fibers.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
The invention discloses a gas analysis device with an automatic calibration function and a calibration method, wherein the calibration method comprises the following steps: the gas chamber component comprises a driving circuit, a laser, a gas chamber component, a detector, an amplifying circuit and a control circuit which are sequentially and electrically connected; the gas chamber assembly comprises a measured gas pool and at least one standard gas chamber which are connected in parallel, and the light path of the measured gas pool and the light paths of all the standard gas chambers are connected with optical switches; when calibration is needed, the control circuit sequentially controls the communication of the optical switch of any standard gas chamber and controls the driving circuit to output signals to the laser, the laser emits laser to the standard gas chamber, the detector converts optical signals into electric signals, and the electric signals are amplified by the amplifying circuit and then enter the control circuit; the control circuit calibrates the electric signal according to the known concentration and the measurement signal of the standard gas; wherein multi-point calibration can be achieved when using multi-standard gas chambers.
The invention is described in further detail below with reference to the attached drawing figures:
the present invention is described by taking two standard gas chambers (a first standard gas chamber 2 and a second standard gas chamber 3) as an example, and it should be noted that the present invention is not limited to the use of two standard gas chambers, and may also be implemented by using one standard gas chamber to perform one-point calibration, three-point calibration using three standard gas chambers, and the like.
As shown in fig. 1, the present invention provides a gas analyzer with an automatic calibration function, including: the device comprises a detected gas pool 1, a first standard gas chamber 2, a second standard gas chamber 3, a first optical switch 4, a second optical switch 5, a third optical switch 6, a laser 7, a driving circuit 8, a control circuit 9, an amplifying circuit 10, a detector 11, a beam splitting optical fiber 12 and a beam combining optical fiber 13, wherein the beam splitting optical fiber 12 is provided with 3 beam splitting ends and 1 beam combining end, namely one path is divided into three paths; the beam combining optical fiber 13 has 3 beam splitting ends and 1 beam combining end, namely three paths are combined into one path; wherein the content of the first and second substances,
the drive circuit 8 is connected with the laser 7, and the tested gas pool 1, the first standard gas chamber 2 and the second standard gas chamber 3 which are connected in parallel are connected between the laser 7 and the detector 11, and the specific connection is as follows: the input end of the gas cell 1 to be detected is connected with the first beam splitting end of the beam splitting optical fiber 12, and the beam combining end of the beam splitting optical fiber 12 is connected with the output end of the laser 7; the output end of the detected gas pool 1 is connected with the first beam splitting end of the beam combining optical fiber 13, the beam combining end of the beam combining optical fiber 13 is connected with the detector 11, and the first branch of the beam splitting optical fiber 12 is connected with the first optical switch 4; the input end of the first standard gas chamber 2 is connected with the second beam splitting end of the beam splitting optical fiber 12, and the beam combining end of the beam splitting optical fiber 12 is connected with the output end of the laser 7; the output end of the first standard gas chamber 2 is connected with the second beam splitting end of the beam combining optical fiber 13, the beam combining end of the beam combining optical fiber 13 is connected with the detector 11, and the second branch of the beam splitting optical fiber 12 is connected with the second optical switch 5; the input end of the second standard gas chamber 3 is connected with the third beam splitting end of the beam splitting optical fiber 12, and the beam combining end of the beam splitting optical fiber 12 is connected with the output end of the laser 7; the output end of the second standard gas chamber 3 is connected with a second beam splitting end of a beam combining optical fiber 13, a beam combining end detector 11 of the beam combining optical fiber 13 is connected with the output end of the second standard gas chamber, and a third branch of the beam splitting optical fiber 12 is connected with a third optical switch 6; the detector 11 is connected with the amplifying circuit 10, the amplifying circuit 10 is connected with the control circuit 9, and the control circuit 9 is connected with the driving circuit 8 and the first optical switch 4, the second optical switch 5 and the third optical switch 6, and is used for controlling the operation of the driving circuit 8 and the opening and closing of the first optical switch 4, the second optical switch 5 and the third optical switch 6, calculating the gas concentration and calibrating the electric signal.
As shown in FIG. 2, the gas cell 1 to be measured of the present invention includes a plurality of sets of reflectors 1-1, the reflectors 1-1 are mounted on reflector bases 1-2; the reflector 1-1 is used for realizing multiple reflection of the laser in the gas pool to be tested.
As shown in fig. 3, the first standard gas chamber 2 and the second standard gas chamber 3 of the present invention are filled with gases with different known concentrations for realizing multi-point calibration of the gas analysis device; wherein, the first standard gas chamber 2 or the second standard gas chamber 3 comprises a lightproof gas chamber wall 2-2 and a light-permeable lens 2-1 arranged at the two ends of the gas chamber wall 2-2, and the gas 2-3 with known concentration is filled in the gas chamber formed by the gas chamber wall 2-2 and the lens 2-1.
The invention provides a gas calibration method with an automatic calibration function, which comprises the following steps:
when the normal work is carried out:
the control circuit 9 controls the first optical switch 4 to be communicated, the second optical switch 5 and the third optical switch 6 to be disconnected, and controls the driving circuit 8 to give a signal to the laser 7, the laser 7 emits laser, the laser passes through the beam splitting optical fiber 12 to the gas cell 1 to be detected, then the signal reaches the detector 11 through the beam combining optical fiber 13, the detector 11 converts the optical signal into an electric signal, the signal is amplified by the amplifying circuit 10 and then enters the control circuit 9, and the measurement of the concentration of the gas to be detected is completed;
before the concentration measurement of the measured gas or when the gas analysis is carried out for a period of time and the like, calibration is needed:
the control circuit 9 controls the second optical switch 5 to be connected, the first optical switch 4 and the third optical switch 6 to be disconnected, and controls the driving circuit 8 to give a signal to the laser 7, the laser 7 emits laser, the laser passes through the beam splitting optical fiber 12 to reach the first standard gas chamber 2, then the signal reaches the detector 11 through the beam combining optical fiber 13, the detector 11 converts the optical signal into an electrical signal, and the electrical signal is amplified by the amplifying circuit 10 and then enters the control circuit 9; the control circuit 9 calibrates the electric signal according to the known concentration of the standard gas and the measurement signal of the control circuit 9 to realize one-point calibration;
the control circuit 9 controls the third optical switch 6 to be connected, the first optical switch 4 and the second optical switch 5 to be disconnected, and controls the driving circuit 8 to give a signal to the laser 7, the laser 7 emits laser, the laser passes through the beam splitting optical fiber 12 to reach the second standard gas chamber 3, then the signal reaches the detector 11 through the beam combining optical fiber 13, the detector 11 converts the optical signal into an electrical signal, and the electrical signal is amplified by the amplifying circuit 10 and then enters the control circuit 9; the control circuit 9 calibrates the electric signal according to the known concentration and the measurement signal of the standard gas to realize another point calibration; multi-point calibration is realized;
after the calibration is finished, the concentration of the gas to be measured in the gas cell 1 can be continuously and accurately measured; the first standard gas chamber 2 and the second standard gas chamber 3 are standard modules, and the standard gas chambers with different concentrations of different gases can be detachably replaced.
The invention has the advantages that:
the invention can switch the light path to the standard gas chamber by controlling the optical switch to realize automatic calibration, thereby reducing the workload of a calibration instrument and the use amount of the standard gas, and further reducing the pollution to the environment; meanwhile, the invention can realize multi-point calibration of the gas analysis device according to different concentrations of a plurality of standard gas chambers.
The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes will occur to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (7)
1. A gas analysis apparatus with an automatic calibration function, comprising: the gas chamber component comprises a driving circuit, a laser, a gas chamber component, a detector, an amplifying circuit and a control circuit which are sequentially and electrically connected;
the gas chamber assembly comprises a measured gas cell and at least one standard gas chamber which are connected in parallel, and the light path of the measured gas cell and the light paths of all the standard gas chambers are connected with optical switches.
2. The gas analysis apparatus of claim 1, wherein the gas cell assembly comprises a measured gas cell and at least one standard gas cell in parallel;
the laser input end of the measured gas pool and the laser input ends of all the standard gas chambers are correspondingly connected with the beam splitting end of a beam splitting optical fiber, and the beam combining end of the beam splitting optical fiber is connected with the output end of the laser;
and the laser output end of the detected gas pool and the laser output ends of all the standard gas chambers are correspondingly connected with the beam splitting end of the beam combining optical fiber, and the beam combining end of the beam combining optical fiber is connected with the detector.
3. The gas analysis apparatus of claim 2, wherein the gas cell under test includes a plurality of sets of mirrors, the mirrors being mounted on a mirror mount; the reflecting mirror is used for realizing multiple reflection of the laser in the gas pool to be detected.
4. The gas analysis apparatus of claim 2, wherein the standard gas cell is filled with a known concentration of gas for enabling multi-point calibration of the gas analysis apparatus.
5. The gas analysis apparatus according to claim 4, wherein the standard gas chamber comprises a gas chamber wall and a light-permeable lens mounted at both ends of the gas chamber wall, and a gas of a known concentration is filled in a gas chamber formed by the gas chamber wall and the lens.
6. A calibration method based on the gas analysis apparatus according to any one of claims 1 to 5, comprising:
when the normal work is carried out:
the control circuit controls the optical switch of the gas cell to be measured to be connected, other optical switches to be disconnected and controls the driving circuit to output signals to the laser, the laser emits laser, the laser passes through the beam splitting optical fiber to the gas cell to be measured, then the signals reach the detector through the beam combining optical fiber, the detector converts the optical signals into electric signals, the electric signals are amplified by the amplifying circuit and then enter the control circuit, and the measurement of the concentration of the gas to be measured is completed;
when a point calibration is required:
the control circuit controls the optical switch of a standard gas chamber to be communicated, the other optical switches to be disconnected and controls the driving circuit to output signals to the laser, the laser emits laser, the laser passes through the beam splitting optical fiber to reach the standard gas chamber, then the signals reach the detector through the beam combining optical fiber, the detector converts the optical signals into electric signals, and the electric signals are amplified by the amplifying circuit and then enter the control circuit; the control circuit calibrates the electric signal according to the known concentration and the measurement signal of the standard gas, and realizes one-point calibration.
7. The calibration method of claim 6, when multi-point calibration is required, further comprising:
the control circuit sequentially controls the optical switch of the other standard gas chamber to be connected, the other optical switches to be disconnected and controls the driving circuit to output signals to the laser, the laser emits laser, the laser passes through the beam splitting optical fiber to the standard gas chamber, then the signals reach the detector after being combined, the detector converts the optical signals into electric signals, and the electric signals are amplified by the amplifying circuit and then enter the control circuit; the control circuit calibrates the electric signal according to the known concentration and the measurement signal of the standard gas, and multi-point calibration is realized.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011294874.4A CN112345528A (en) | 2020-11-18 | 2020-11-18 | Gas analysis device with automatic calibration function and calibration method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011294874.4A CN112345528A (en) | 2020-11-18 | 2020-11-18 | Gas analysis device with automatic calibration function and calibration method |
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| CN202011294874.4A Pending CN112345528A (en) | 2020-11-18 | 2020-11-18 | Gas analysis device with automatic calibration function and calibration method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113092378A (en) * | 2021-04-16 | 2021-07-09 | 中国科学院长春光学精密机械与物理研究所 | Laser gas detection device |
| CN114609343A (en) * | 2022-03-28 | 2022-06-10 | 南京分析仪器厂有限公司 | Waste gas detection calibration method |
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Application publication date: 20210209 |