CN118190842A - Gas concentration distribution testing method and system based on tuning diode laser absorption tomography method - Google Patents
Gas concentration distribution testing method and system based on tuning diode laser absorption tomography method Download PDFInfo
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Abstract
The invention discloses a gas concentration distribution testing method and a system based on a tuning diode laser absorption tomography method, which relate to the field of gas concentration detection, and the method comprises the steps of utilizing laser sweeping to combine with guide rail annular scanning, completing scanning of a 360-degree area of a cooling tower, and collecting laser on each optical path; performing photoelectric conversion on the laser on each optical path to obtain an electric signal on each optical path; processing and collecting the electric signals on each optical path to obtain collected data on each optical path; and analyzing and processing the acquired data on each optical path by adopting a tuned diode laser absorption tomography method to obtain a gas concentration distribution diagram in the cooling tower. The invention can effectively improve the utilization rate of the light beam, more accurately image the gas concentration distribution, and simultaneously reduce the related operation cost and maintenance cost.
Description
Technical Field
The invention relates to the field of gas concentration detection, in particular to a gas concentration distribution testing method and system based on a tuning diode laser absorption tomography method.
Background
Thermal power generation is a main power generation mode in China, and occupies a total power generation amount in China for a long time in a seven-to-about proportion, wherein the contribution of a coal-fired power plant occupies a large half. Therefore, how to quickly acquire the carbon emission distribution data of the coal-fired power plant provides necessary technical support for the execution of the emission reduction plan and the evaluation of the emission reduction effect.
Currently, mainstream gas concentration detection technologies are mainly classified into two types, contact type and non-contact type. The contact type measuring method can only measure the gas concentration near a certain point, and can not accurately measure the gas concentration for a scene in a large space; in addition, the measurement is subject to interference from the surrounding environment, and the result is delayed. The non-contact method is mainly an optical gas detection technology, and a tunable semiconductor laser absorption spectroscopy technology (Tunable Diode Laser Absorption Spectroscopy, TDLAS) is taken as a representative of the optical gas detection technology, so that the non-invasive gas detection method is one of the most advanced gas measurement technologies in the world currently by virtue of non-invasive, rapid response, strong anti-interference capability, high sensitivity and the like. However, the method can only detect the average concentration of the gas on a single optical path, but cannot obtain the actual concentration distribution of the gas on the whole section.
Disclosure of Invention
The invention aims to provide a gas concentration distribution testing method and system based on a tuning diode laser absorption tomography method, which can effectively improve the light beam utilization rate.
In order to achieve the above object, the present invention provides the following solutions:
a gas concentration distribution testing method based on a tuning diode laser absorption tomography method comprises the following steps:
The laser swing scanning is combined with the guide rail annular scanning to finish scanning of a 360-degree area of the cooling tower, and laser on each optical path is collected;
Performing photoelectric conversion on the laser on each optical path to obtain an electric signal on each optical path;
processing and collecting the electric signals on each optical path to obtain collected data on each optical path;
and analyzing and processing the acquired data on each optical path by adopting a tuned diode laser absorption tomography method to obtain a gas concentration distribution diagram in the cooling tower.
Optionally, the collected data on each optical path is analyzed and processed by adopting a tuned diode laser absorption tomography method to obtain a gas concentration distribution diagram in the cooling tower, which specifically comprises the following steps:
calculating the average concentration of the gas of each optical path based on the acquired data on each optical path by adopting a Beer-Lambert law to obtain a concentration value of each optical path;
and carrying out concentration inversion calculation by adopting an electronic computer tomography method and utilizing a simulated annealing algorithm based on the concentration value of each light path to obtain a gas concentration distribution diagram in the cooling tower.
A gas concentration distribution testing system based on a tuned diode laser absorption tomography method applies the gas concentration distribution testing method based on the tuned diode laser absorption tomography method as described above, the system comprising: the device comprises an annular guide rail, a laser emission module, a detection module, a signal acquisition module, a signal processing module and a human-computer interaction interface;
The annular guide rail is arranged at the top of the cooling tower; the laser emission module is arranged on the annular guide rail; the laser emission module and the annular guide rail are controlled by a human-computer interaction interface; the man-machine interaction interface is used for controlling the rotation movement of the annular guide rail and the scanning angle of the laser emission module so as to ensure that the laser emitted by the laser emission module finishes scanning of a 360-degree area on the cooling tower;
The laser emission module and the detection module are oppositely arranged on the annular guide rail; the detection module is connected with the signal acquisition module; the detection module is used for collecting the laser on each optical path emitted by the laser emission module, performing photoelectric conversion on the laser on each optical path to obtain an electric signal on each optical path, and transmitting the electric signal on each optical path to the signal collection module;
The signal acquisition module is also connected with the signal processing module; the signal acquisition module is used for processing and acquiring the electric signals on each optical path to obtain acquisition data on each optical path, and transmitting the acquisition data on each optical path to the signal processing module;
The signal processing module is used for analyzing and processing the acquired data on each optical path by adopting a tuned diode laser absorption tomography method to obtain a gas concentration distribution diagram in the cooling tower and displaying the gas concentration distribution diagram through a human-computer interaction interface.
Optionally, the laser emitting module comprises a function signal generator, a laser controller, a laser emitter and a fiber optic beam splitter;
the function signal generator is connected with the laser controller; the function signal generator is used for generating sawtooth wave output to the laser controller;
the laser controller is also connected with the laser transmitter; the laser controller is used for controlling the laser emitter based on the sawtooth wave;
the optical fiber beam splitter is arranged on the output light path of the laser transmitter.
Optionally, the detection module is a photodetector.
Optionally, the signal acquisition module comprises a pre-amplifying circuit, a microprocessor, a lock-in amplifier and a data acquisition card;
The input end of the pre-amplifying circuit is connected with the output end of the photoelectric detector; the output end of the pre-amplifying circuit is connected with the input end of the microprocessor; the pre-amplifying circuit is used for amplifying the electric signals on each optical path and transmitting the amplified electric signals on each optical path to the microprocessor;
the output end of the microprocessor is connected with the input end of the lock-in amplifier; the microprocessor is used for carrying out filtering processing on the electric signals amplified on each optical path and transmitting the electric signals subjected to the first filtering processing on each optical path to the lock-in amplifier;
The output end of the phase-locked amplifier is connected with the data acquisition card; the phase-locked amplifier is used for carrying out filtering treatment on the electric signals subjected to the first filtering treatment on each optical path and transmitting the electric signals subjected to the second filtering treatment on each optical path to the data acquisition card;
the output end of the data acquisition card is connected with the signal processing module; the data acquisition card is used for carrying out data acquisition on the electric signals after the second filtering processing on each optical path and transmitting the acquired data on each optical path to the signal processing module.
Optionally, the collected data on each optical path is analyzed and processed by adopting a tuned diode laser absorption tomography method to obtain a gas concentration distribution diagram in the cooling tower, which specifically comprises the following steps:
calculating the average concentration of the gas of each optical path based on the acquired data on each optical path by adopting a Beer-Lambert law to obtain a concentration value of each optical path;
And carrying out concentration inversion calculation based on the concentration value of each light path by adopting an electronic computer tomography method by using a simulated annealing algorithm to obtain a gas concentration distribution diagram in the cooling tower, and displaying the gas concentration distribution diagram through a human-computer interaction interface.
Optionally, the man-machine interaction interface is designed by adopting QT software.
Optionally, the microprocessor is of the type XC7Z010-CLG400-2.
According to the specific embodiment provided by the invention, the invention discloses the following technical effects:
The invention discloses a gas concentration distribution testing method and a system based on a tuning diode laser absorption tomography method, wherein the method comprises the steps of utilizing laser swing scanning to combine with guide rail annular scanning, completing scanning of a 360-degree area of a cooling tower, and collecting laser on each optical path; performing photoelectric conversion on the laser on each optical path to obtain an electric signal on each optical path; processing and collecting the electric signals on each optical path to obtain collected data on each optical path; and analyzing and processing the acquired data on each optical path by adopting a tuned diode laser absorption tomography method to obtain a gas concentration distribution diagram in the cooling tower. The invention can effectively improve the utilization rate of the light beam, more accurately image the concentration distribution of CO 2, and simultaneously, the man-machine interaction interface can improve the convenience of the system and reduce the related operation cost and maintenance cost.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic flow chart of a gas concentration distribution testing method based on a tuning diode laser absorption tomography method according to embodiment 1 of the present invention;
Fig. 2 is a schematic diagram of a gas concentration distribution testing system based on a tuned diode laser absorption tomography method according to embodiment 2 of the present invention;
fig. 3 is a schematic diagram illustrating the installation of a laser emitting module and a photodetector according to embodiment 2 of the present invention;
Fig. 4 is a schematic flow chart of the laser emission module according to embodiment 2 of the present invention;
Fig. 5 is a flow chart of the CO 2 gas concentration profile test of the present invention provided in example 2 of the present invention.
Fig. 6 is a schematic diagram of related functions of a man-machine interaction interface according to embodiment 2 of the present invention.
Symbol description:
the device comprises a ring-shaped guide rail-1, a laser emitting module-2, a photoelectric detector-3, a signal acquisition module-4, a signal processing module-5 and a human-computer interaction interface-6.
Detailed Description
The following description of the embodiments of the present invention 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 invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The invention aims to provide a gas concentration distribution testing method and system based on a tuning diode laser absorption tomography method, aiming at effectively improving the light beam utilization rate.
The invention effectively improves the utilization rate of the light beam through the special light path design, improves the convenience of the system, reduces the related operation cost and maintenance cost, and can be used for detecting the concentration distribution of CO 2 gas in the coal-fired power plant.
In order that the above-recited objects, features and advantages of the present invention will become more readily apparent, a more particular description of the invention will be rendered by reference to the appended drawings and appended detailed description.
Example 1
As shown in fig. 1, a gas concentration distribution testing method based on a tuned diode laser absorption tomography method in this embodiment includes:
step 101: and (3) scanning the 360-degree area of the cooling tower by combining laser swabbing with guide rail annular scanning, and collecting laser on each optical path.
Step 102: and carrying out photoelectric conversion on the laser on each optical path to obtain an electric signal on each optical path.
Step 103: and processing and collecting the electric signals on each optical path to obtain the collected data on each optical path.
Step 104: and analyzing and processing the acquired data on each optical path by adopting a tuned diode laser absorption tomography method to obtain a gas concentration distribution diagram in the cooling tower.
And calculating the average concentration of the gas of each optical path based on the acquired data on each optical path by adopting a Beer-Lambert law to obtain the concentration value of each optical path.
And carrying out concentration inversion calculation by adopting an electronic computer tomography method and utilizing a simulated annealing algorithm based on the concentration value of each light path to obtain a gas concentration distribution diagram in the cooling tower.
The tunable diode laser absorption tomography method combines the advantages and characteristics of the TDLAS technology and the Computed Tomography (CT) technology, equivalently improves the number of laser beams through the form of annular guide rail rotary scanning and laser swabbing, and reconstructs gas two-dimensional distribution after analysis, calculation and fitting, so that the tunable diode laser absorption tomography method has been widely focused in recent years and becomes one of the most potential methods in the fields of engine diagnosis and the like.
Example 2
As shown in fig. 2 to 6, a gas concentration distribution testing system based on a tuned diode laser absorption tomography method, which employs the gas concentration distribution testing method based on a tuned diode laser absorption tomography method as described in embodiment 1, comprises: the device comprises an annular guide rail 1, a laser emission module 2, a detection module, a signal acquisition module 4, a signal processing module 5 and a human-computer interaction interface 6.
The annular guide rail 1 is arranged at the top of the cooling tower; the top section of a cooling tower of a thermal power station is provided with an annular guide rail 1; the annular guide rail 1 is a precise annular guide rail. The laser emitting module 2 is arranged on the annular guide rail 1. The laser emission module 2 and the annular guide rail 1 are controlled by a human-computer interaction interface 6; the man-machine interaction interface 6 is used for controlling the rotation motion of the annular guide rail 1 and the scanning angle of the laser emission module 2 so as to ensure that the laser emitted by the laser emission module 2 can complete the scanning of a 360-degree area on the cooling tower. The man-machine interaction interface 6 scans the sector area while controlling the 360-degree rotation of the precise annular guide rail.
The annular guide rail 1 is paved on the top section of a cooling tower of a thermal power station, and the purpose of the annular guide rail is to facilitate the angle and position change of a laser light source and a photoelectric detector 3 which are subjected to optical fiber beam splitting in a laser emission module 2, so that the annular guide rail is movable.
The laser emission module 2 is characterized in that a plurality of laser light sources and a plurality of photoelectric detectors 3 which are split by optical fibers are arranged on the annular guide rail 1 in an opposite mode, and the human-computer interaction interface 6 controls the annular guide rail 1 to rotate 360 degrees and simultaneously controls the laser light sources to perform sector scanning on a region to be detected.
The man-machine interaction interface 6 is designed by adopting QT software, and the man-machine interaction interface 6 can be transplanted to the ARM end of the processor through a Linux system. The man-machine interaction interface 6 is used for controlling the rotation of the precise annular guide rail and the angle adjustment of the laser light source, and displaying the gas concentration distribution diagram in the cooling tower in real time.
The laser emission module 2 and the detection module are arranged on the annular guide rail 1 in opposite directions; the detection module is connected with the signal acquisition module 4; the detection module is used for collecting the laser on each optical path emitted by the laser emission module 2, performing photoelectric conversion on the laser on each optical path to obtain an electric signal on each optical path, and transmitting the electric signal on each optical path to the signal collection module 4.
The detection module is a photoelectric detector 3.
The laser emitting module 2 comprises a function signal generator, a laser controller, a laser emitter and a fiber optic beam splitter.
The function signal generator outputs sawtooth wave to the laser controller to realize the input of modulation signal, the laser controller is connected with the laser transmitter, the laser transmitter is controlled by the built-in temperature module and the built-in current module, and then the function signal generator is connected with the optical fiber beam splitter to divide the laser into a plurality of beams to be emitted.
The function signal generator is connected with the laser controller; the function signal generator is used for generating sawtooth wave output to the laser controller.
The laser controller is also connected with the laser transmitter; the laser controller is used for controlling the laser emitter based on the sawtooth wave.
The optical fiber beam splitter is arranged on the output light path of the laser transmitter.
The signal acquisition module 4 is also connected with the signal processing module 5; the signal acquisition module 4 is configured to process and acquire an electrical signal on each optical path, obtain acquired data on each optical path, and transmit the acquired data on each optical path to the signal processing module 5.
The signal acquisition module 4 adopts a pre-amplifier to amplify the electric signal, filters the amplified signal through a PL end and a PS end of the controller, and finally transmits the filtered signal to the lock-in amplifier, and completes data acquisition through a data acquisition card.
The signal acquisition module 4 comprises a pre-amplifying circuit, a microprocessor, a lock-in amplifier and a data acquisition card.
The electrical signal converted by the photodetector 3 is first amplified by a pre-amplifying circuit; after preliminary filtering by a microprocessor, a phase-locked amplifier performs further filtering processing, so that a signal with smaller noise influence is obtained; and finally, completing data acquisition through a data acquisition card.
The input end of the pre-amplifying circuit is connected with the output end of the photoelectric detector 3; the output end of the pre-amplifying circuit is connected with the input end of the microprocessor; the pre-amplifying circuit is used for amplifying the electric signals on each optical path and transmitting the amplified electric signals on each optical path to the microprocessor.
The output end of the microprocessor is connected with the input end of the lock-in amplifier; the microprocessor is used for carrying out filtering processing on the electric signals amplified on each optical path and transmitting the electric signals subjected to the first filtering processing on each optical path to the lock-in amplifier. The model of the microprocessor is XC7Z010-CLG400-2.
The output end of the phase-locked amplifier is connected with the data acquisition card; the phase-locked amplifier is used for carrying out filtering processing on the electric signals subjected to the first filtering processing on each optical path and transmitting the electric signals subjected to the second filtering processing on each optical path to the data acquisition card.
The output end of the data acquisition card is connected with the signal processing module 5; the data acquisition card is used for carrying out data acquisition on the electric signals after the second filtering processing on each optical path and transmitting the acquired data on each optical path to the signal processing module 5.
The signal processing module 5 is used for analyzing and processing the acquired data on each optical path by adopting a tuned diode laser absorption tomography method to obtain a gas concentration distribution diagram in the cooling tower.
The invention also provides a specific embodiment:
(1) The precision annular rail is mounted to the plane of the top of the cooling tower.
(2) The laser emission module is divided into 3 paths of laser sources through optical fibers and is connected with the precise annular guide rail through a micro motor.
(3) A plurality of photoelectric detectors are arranged on the precise annular guide rail, the photoelectric detectors and the laser light sources are arranged in opposite directions, and one path of laser light source is matched with 5 photoelectric detectors.
(4) The human-computer interaction interface controls the whole testing system to work, and 3 paths of lasers fixed on the precise annular guide rail realize 360-degree scanning of the cross section of the top of the cooling tower through rotation; and simultaneously, each path of laser is used for realizing the scanning of a specific 60-degree sector area by adjusting the angle through a micro motor.
(5) The signal acquisition module amplifies and filters the electric signal of the photoelectric detector and acquires the electric signal through the data acquisition card.
(6) The signal processing module calculates the average concentration of a single light path according to Beer-Lambert law, and then performs concentration inversion calculation by utilizing a simulated annealing algorithm in combination with an electronic computed tomography (ComputedTomography, CT) technology, so as to obtain a two-dimensional distribution diagram of the concentration of CO 2 gas in the region.
(7) The man-machine interaction interface displays the two-dimensional distribution of the reconstructed concentration of the CO 2 gas in the area in real time, and is provided with corresponding operation keys to control the rotation motion of the precise annular guide rail and the angle scanning of the laser light source, so that the equivalent laser beams of the cross section of the top of the cooling tower are increased, and the accuracy of the concentration inversion of the CO 2 in the area is improved.
The technical features of the above embodiments may be arbitrarily combined, and for brevity of description, all of the possible combinations of each technical feature in the above embodiments are not described, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.
The principles and embodiments of the present invention have been described herein with reference to specific examples, the description of which is intended only to assist in understanding the methods of the present invention and the core ideas thereof; also, it is within the scope of the present invention to be modified by those of ordinary skill in the art in light of the present teachings. In view of the foregoing, this description should not be construed as limiting the invention.
Claims (9)
1. A method for testing gas concentration distribution based on a tuned diode laser absorption tomography method, the method comprising:
The laser swing scanning is combined with the guide rail annular scanning to finish scanning of a 360-degree area of the cooling tower, and laser on each optical path is collected;
Performing photoelectric conversion on the laser on each optical path to obtain an electric signal on each optical path;
processing and collecting the electric signals on each optical path to obtain collected data on each optical path;
and analyzing and processing the acquired data on each optical path by adopting a tuned diode laser absorption tomography method to obtain a gas concentration distribution diagram in the cooling tower.
2. The method for testing the gas concentration distribution based on the tuned diode laser absorption tomography method according to claim 1, wherein the method for analyzing the collected data on each optical path by using the tuned diode laser absorption tomography method to obtain the gas concentration distribution map in the cooling tower specifically comprises the following steps:
calculating the average concentration of the gas of each optical path based on the acquired data on each optical path by adopting a Beer-Lambert law to obtain a concentration value of each optical path;
and carrying out concentration inversion calculation by adopting an electronic computer tomography method and utilizing a simulated annealing algorithm based on the concentration value of each light path to obtain a gas concentration distribution diagram in the cooling tower.
3. A gas concentration distribution testing system based on a tuned diode laser absorption tomography method, wherein the system applies the gas concentration distribution testing method based on a tuned diode laser absorption tomography method as claimed in claims 1-2, the system comprising: the device comprises an annular guide rail, a laser emission module, a detection module, a signal acquisition module, a signal processing module and a human-computer interaction interface;
The annular guide rail is arranged at the top of the cooling tower; the laser emission module is arranged on the annular guide rail; the laser emission module and the annular guide rail are controlled by a human-computer interaction interface; the man-machine interaction interface is used for controlling the rotation movement of the annular guide rail and the scanning angle of the laser emission module so as to ensure that the laser emitted by the laser emission module finishes scanning of a 360-degree area on the cooling tower;
The laser emission module and the detection module are oppositely arranged on the annular guide rail; the detection module is connected with the signal acquisition module; the detection module is used for collecting the laser on each optical path emitted by the laser emission module, performing photoelectric conversion on the laser on each optical path to obtain an electric signal on each optical path, and transmitting the electric signal on each optical path to the signal collection module;
The signal acquisition module is also connected with the signal processing module; the signal acquisition module is used for processing and acquiring the electric signals on each optical path to obtain acquisition data on each optical path, and transmitting the acquisition data on each optical path to the signal processing module;
The signal processing module is used for analyzing and processing the acquired data on each optical path by adopting a tuned diode laser absorption tomography method to obtain a gas concentration distribution diagram in the cooling tower and displaying the gas concentration distribution diagram through a human-computer interaction interface.
4. The gas concentration distribution testing system based on the tuning diode laser absorption tomography method of claim 3, wherein the laser emitting module comprises a function signal generator, a laser controller, a laser emitter and a fiber optic beam splitter;
the function signal generator is connected with the laser controller; the function signal generator is used for generating sawtooth wave output to the laser controller;
the laser controller is also connected with the laser transmitter; the laser controller is used for controlling the laser emitter based on the sawtooth wave;
the optical fiber beam splitter is arranged on the output light path of the laser transmitter.
5. The system for testing gas concentration distribution based on the tuned diode laser absorption tomography method of claim 3, wherein the detection module is a photodetector.
6. The gas concentration distribution testing system based on the tuning diode laser absorption tomography method of claim 5, wherein the signal acquisition module comprises a pre-amplification circuit, a microprocessor, a lock-in amplifier and a data acquisition card;
The input end of the pre-amplifying circuit is connected with the output end of the photoelectric detector; the output end of the pre-amplifying circuit is connected with the input end of the microprocessor; the pre-amplifying circuit is used for amplifying the electric signals on each optical path and transmitting the amplified electric signals on each optical path to the microprocessor;
the output end of the microprocessor is connected with the input end of the lock-in amplifier; the microprocessor is used for carrying out filtering processing on the electric signals amplified on each optical path and transmitting the electric signals subjected to the first filtering processing on each optical path to the lock-in amplifier;
The output end of the phase-locked amplifier is connected with the data acquisition card; the phase-locked amplifier is used for carrying out filtering treatment on the electric signals subjected to the first filtering treatment on each optical path and transmitting the electric signals subjected to the second filtering treatment on each optical path to the data acquisition card;
the output end of the data acquisition card is connected with the signal processing module; the data acquisition card is used for carrying out data acquisition on the electric signals after the second filtering processing on each optical path and transmitting the acquired data on each optical path to the signal processing module.
7. The system for testing gas concentration distribution based on the tuned diode laser absorption tomography method according to claim 3, wherein the method for analyzing the collected data on each optical path by using the tuned diode laser absorption tomography method to obtain the gas concentration distribution map in the cooling tower specifically comprises the following steps:
calculating the average concentration of the gas of each optical path based on the acquired data on each optical path by adopting a Beer-Lambert law to obtain a concentration value of each optical path;
And carrying out concentration inversion calculation based on the concentration value of each light path by adopting an electronic computer tomography method by using a simulated annealing algorithm to obtain a gas concentration distribution diagram in the cooling tower, and displaying the gas concentration distribution diagram through a human-computer interaction interface.
8. The system for testing gas concentration distribution based on the tuning diode laser absorption tomography method of claim 3, wherein the human-computer interaction interface is designed by QT software.
9. The system for testing gas concentration distribution based on the tuning diode laser absorption tomography method as claimed in claim 6, wherein the microprocessor is of the type XC7Z010-CLG400-2.
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