CN114965319B - Gas parameter multidimensional detection system and measurement method based on absorption spectrum - Google Patents
Gas parameter multidimensional detection system and measurement method based on absorption spectrum Download PDFInfo
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- CN114965319B CN114965319B CN202210613760.4A CN202210613760A CN114965319B CN 114965319 B CN114965319 B CN 114965319B CN 202210613760 A CN202210613760 A CN 202210613760A CN 114965319 B CN114965319 B CN 114965319B
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Abstract
The invention relates to the technical field of laser absorption spectrum, in particular to a gas parameter multidimensional detection system and a measurement method based on absorption spectrum, wherein the system comprises a three-dimensional translation stage module, a physical field generation module to be measured and a laser module; the W-axis rotary table is rotatably arranged on the bottom plate; the two groups of X-axis translation tables are arranged on the W-axis rotary table in a sliding manner, and mounting columns are vertically arranged on the two groups of X-axis translation tables; the Z-axis translation table a and the Z-axis translation table b are respectively arranged on the two groups of mounting columns in a sliding manner; the left supporting table and the right supporting table are respectively arranged on the Z-axis translation table b and the Z-axis translation table a; the laser emission module and the laser detector are respectively arranged on the left supporting table and the right supporting table; the bottom of the thermal physical field generating device is provided with a lifting table. The invention can rapidly acquire the two-dimensional and three-dimensional gas thermophysical parameter distribution of the region to be measured. By adjusting the vertical height of the physical field generating device to be measured, more gas thermophysical parameter distribution in the vertical direction can be obtained.
Description
Technical Field
The invention relates to the technical field of laser absorption spectrum, in particular to a gas parameter multidimensional detection system and a measurement method based on absorption spectrum.
Background
The laser absorption spectrum technology is widely applied to various fields such as atmospheric environment monitoring, industrial process monitoring, combustion diagnosis and the like as a non-invasive high-precision detection means. During the last decades researchers have performed measurement studies based on the temperature of the gas stream, the concentration of components on a single path of laser absorption spectroscopy techniques and the reconstruction of the thermophysical parameters of gas stream temperature, component concentration, flow rate and pressure in combination with tomography techniques.
At present, aiming at a non-uniform thermophysical field or a combustion field, most of research works are to divide a plurality of lasers into parallel or irregular multi-path lasers through an optical fiber beam splitter after coupling based on a TDLAS technology, then pass through a region to be detected, acquire a plurality of spectral line absorption data in different directions by utilizing a plurality of photoelectric detectors, and reconstruct and detect two-dimensional thermophysical parameters of the region to be detected based on a tomography algorithm. However, the measurement method has the problems that an experimental system is complex, the manufacturing cost is high, the number and the resolution of optical paths are limited by the sizes of a laser collimator and a photoelectric detector, the light intensity of the laser after beam splitting is weakened, and the like. In order to solve the problems, researchers change laser from a point light source to a surface light source through the transformation of an optical lens, and three-dimensional reconstruction of relevant thermophysical parameters of a combustion field is realized by combining a two-dimensional infrared sensor and multi-angle measurement of a region to be detected. However, the detection method fixes the laser and the sensor, changes the angle of the burner to acquire the absorption spectrum information of different directions, and can measure the size of the combustion field to be only about 25mm multiplied by 25mm, which is unfavorable for the application to the combustion field of different dimensions, and the two-dimensional infrared sensor has high current price and insufficient spectrum and scanning resolution, thereby influencing the wide application of the technology. Therefore, a general, high-precision and low-cost three-dimensional reconstruction technical scheme and equipment for the thermal physical parameters such as the air flow temperature, the component concentration and the like are not available at present.
Disclosure of Invention
The invention aims at solving the problems in the background technology, and provides a gas thermophysical parameter multidimensional detection system and a measurement method based on a three-dimensional translation stage and a laser absorption spectrum tomography technology, which can realize two-dimensional or three-dimensional parameter reconstruction on an airflow thermophysical field.
On one hand, the invention provides a gas parameter multidimensional detection system based on absorption spectrum, which comprises a three-dimensional translation stage module, a thermal physical field generation module to be detected and a laser module; the three-dimensional translation table module comprises a W-axis rotation table, an X-axis translation table, a right support table, a Z-axis translation table a, a Z-axis translation table b and a left support table; the thermal physical field generating module to be tested comprises a thermal physical field of the gas to be tested and a thermal physical field generating device; the laser module comprises a laser detector and a laser emission module;
the W-axis rotating table is rotatably arranged on the bottom plate, and a W-axis driving motor for driving the W-axis rotating table to rotate is arranged on the bottom plate; the X-axis translation tables are arranged on the W-axis rotation tables in a sliding manner along the X direction, two groups of X-axis translation tables are arranged, an X-axis power assembly for driving the X-axis translation tables to move is arranged on the W-axis rotation tables, and mounting columns are vertically arranged on the two groups of X-axis translation tables; the Z-axis translation table a and the Z-axis translation table b are respectively arranged on two groups of mounting columns in a sliding manner along the vertical direction, and a Z-axis power assembly for driving the Z-axis translation table a and the Z-axis translation table b to move is arranged on each mounting column; the left supporting table and the right supporting table are respectively arranged on the Z-axis translation table b and the Z-axis translation table a, and are horizontally arranged; the laser emission module and the laser detector are respectively arranged on the left supporting table and the right supporting table, and a laser light path is formed between the laser emission module and the laser detector; the bottom plate and the W-axis rotating table are vertically provided with through holes for the heat supply physical field generating device to pass through, the heat physical field generating device upwards generates a thermal physical field of the gas to be detected, a laser light path passes through the thermal physical field of the gas to be detected, and a lifting table is arranged at the bottom of the heat physical field generating device.
Preferably, the X-axis power assembly comprises an X-axis driving motor and a screw a; the X-axis driving motor is arranged on the W-axis rotating table, two groups of X-axis driving motors are arranged, an output shaft of each X-axis driving motor is connected with the screw rod a, the screw rod a is provided with two groups along the X direction, and the X-axis translation table is provided with threaded holes matched with the screw rod a.
Preferably, the Z-axis power assembly comprises a Z-axis driving motor and a screw b; the Z-axis driving motors are arranged in two groups, the two groups of Z-axis driving motors are respectively arranged at the tops of the two groups of mounting posts, the output shafts of the Z-axis driving motors are connected with the screw b, the screw b is vertically arranged in two groups, and threaded holes matched with the screw b are formed in the Z-axis translation table a and the Z-axis translation table b.
Preferably, a reinforcing rib plate is arranged between the left supporting table and the Z-axis translation table b; and a reinforcing rib plate is arranged between the right supporting table and the Z-axis translation table a.
On the other hand, the invention provides a gas parameter multidimensional measuring method of a gas parameter multidimensional detecting system based on absorption spectrum, which is characterized by comprising the following steps of: s11, giving a translation signal of an X-axis driving motor by a computer control end, enabling a left supporting table and a right supporting table to carry a laser emitting module and a laser detector to scan an area to be detected along with the X-axis translation table in parallel, and completing all scanning detection at the same incidence angle; s12, driving the W-axis rotating table, repeating S11 after a given rotating angle instruction is completed, and the like until all target rotating angles are scanned in parallel; s13, driving a Z-axis translation stage a and a Z-axis translation stage b according to fixed step length, and repeating S11 and S12 after the right support platform and the left support platform rise to the target height; s14, repeating S13 until the measurement of the target vertical height is completed.
Preferably, in the gas parameter multidimensional measurement method, the laser emission module and the laser detector are respectively in a linear light source state and a linear matrix detector state, and the method is characterized by comprising the following steps: s21, the linear light source passes through the region to be detected along a single path from an initial incidence angle and is received by the linear matrix detector on the right supporting platform;
s22, driving the W-axis rotating table, repeating S21 after a given rotating angle instruction is completed, and the like until all target rotating angles are scanned in parallel; s23, driving the Z-axis translation stage a and the Z-axis translation stage b according to fixed step length, and repeating S21 and S22 after the right supporting platform and the left supporting platform rise to the target height; s24, repeating the step S24 until the measurement of the target vertical height is completed.
Preferably, in the gas parameter multidimensional measurement method, the laser emission module and the laser detector are respectively in a state of a surface light source and a plane matrix detector, and the method is characterized by comprising the following steps: s31, the surface light source passes through the area to be detected along a single path from an initial incidence angle and is received by a plane matrix detector on a right supporting table;
s32, driving the Z-axis translation stage a and the Z-axis translation stage b according to fixed step length, and repeating S31 after the right support platform and the left support platform rise to the target height; s33, repeating S32 until the measurement of the target vertical height is completed.
Compared with the prior art, the invention has the following beneficial technical effects: 1. the two-dimensional and three-dimensional gas parameter distribution of the region to be measured can be rapidly obtained by combining the laser parallel scanning, vertical scanning and rotary scanning with the spectral tomography technology, a large number of laser beams and sensors are not required to be arranged, an experimental device is simplified, the equipment cost is greatly reduced, and the measurement efficiency can be improved by automatic programming of the translation table and the rotary table. 2. The laser emission module is provided with a point light source, a linear light source and a surface light source, the corresponding laser detector is provided with a point detector, a linear matrix detector and a plane matrix detector, and different light sources and detectors are replaced to obtain different detection methods. 3. By arranging the lifting table below the thermal physical field generating device to adjust the vertical height of the thermal physical field generating device, the accurate positioning of the vertical direction of the measuring plane can be performed, and the measuring range of the vertical direction can be expanded.
Drawings
FIG. 1 is a schematic diagram of an embodiment of the present invention;
FIG. 2 is a schematic diagram of the light path of the point light source detection of the present invention;
FIG. 3 is a schematic view of the optical path of the line source probe of the present invention;
FIG. 4 is a schematic view of the light path of the surface light source detection of the present invention;
FIG. 5 is a flow chart of a third embodiment;
FIG. 6 is a flow chart of a fourth embodiment;
fig. 7 is a flowchart of the fifth embodiment.
Reference numerals: 1. a W-axis rotary table; 2. an X-axis translation stage; 3. an X-axis driving motor; 4. a right support table; 5. a laser detector; 6. a Z-axis translation stage a; 7. a Z-axis driving motor; 8. a thermal physical field of the gas to be measured; 9. a Z-axis translation stage b; 10. a laser emitting module; 11. a left support table; 12. a laser light path; 13. a W-axis driving motor; 14. a thermophysical field generating device; 15. a point light source; 16. a point detector; 17. a line light source; 18. a linear matrix detector; 19. a surface light source; 20. a planar matrix detector.
Detailed Description
Example 1
As shown in fig. 1-4, the gas parameter multidimensional detection system based on the absorption spectrum provided by the invention comprises a three-dimensional translation stage module, a thermal physical field generation module to be detected and a laser module; the three-dimensional translation stage module comprises a W-axis rotation stage 1, an X-axis translation stage 2, a right support stage 4, a Z-axis translation stage a6, a Z-axis translation stage b9 and a left support stage 11; the thermal physical field generating module to be tested comprises a thermal physical field 8 of gas to be tested and a thermal physical field generating device 14; the laser module comprises a laser detector 5 and a laser emission module 10;
the W-axis rotary table 1 is rotatably arranged on a bottom plate, and a W-axis driving motor 13 for driving the W-axis rotary table 1 to rotate is arranged on the bottom plate; the X-axis translation tables 2 are arranged on the W-axis rotation tables 1 in a sliding manner along the X direction, two groups of X-axis translation tables 2 are arranged, an X-axis power assembly for driving the X-axis translation tables 2 to move is arranged on the W-axis rotation tables 1, and mounting columns are vertically arranged on the two groups of X-axis translation tables 2; the Z-axis translation table a6 and the Z-axis translation table b9 are respectively arranged on two groups of mounting columns in a sliding manner along the vertical direction, and a Z-axis power assembly for driving the Z-axis translation table a6 and the Z-axis translation table b9 to move is arranged on each mounting column; the left supporting table 11 and the right supporting table 4 are respectively arranged on the Z-axis translation table b9 and the Z-axis translation table a6, and the left supporting table 11 and the right supporting table 4 are horizontally arranged; the laser emitting module 10 and the laser detector 5 are respectively arranged on the left supporting table 11 and the right supporting table 4, and a laser light path 12 is formed between the laser emitting module 10 and the laser detector 5; the bottom plate and the W-axis rotary table 1 are vertically provided with through holes for the heat supply physical field generating device 14 to pass through, the heat physical field generating device 14 upwards generates the gas heat physical field 8 to be detected, the laser light path 12 passes through the gas heat physical field 8 to be detected, and the bottom of the heat physical field generating device 14 is provided with a lifting table. A reinforcing rib plate is arranged between the left supporting table 11 and the Z-axis translation table b 9; a reinforcing rib is arranged between the right support table 4 and the Z-axis translation table a 6.
The embodiment has the following beneficial effects: 1. the two-dimensional and three-dimensional gas parameter distribution of the region to be measured can be rapidly obtained by combining the laser parallel scanning, vertical scanning and rotary scanning with the spectral tomography technology, a large number of laser beams and sensors are not required to be arranged, an experimental device is simplified, the equipment cost is greatly reduced, and the measurement efficiency can be improved by automatic programming of the translation table and the rotary table. 2. The laser emitting module 10 has a point light source 15, a line light source 17 and a surface light source 19, and the corresponding laser detector 5 has a point detector 16, a linear matrix detector 18 and a plane matrix detector 20, and different light sources and detectors can be replaced to obtain different detection methods. 3. By setting the elevating table below the thermophysical field generating device 14 to adjust the vertical height of the thermophysical field generating device 14, it is possible to perform accurate positioning in the vertical direction of the measurement plane and expand the measurement range in the vertical direction.
Example two
As shown in fig. 1, in the multi-dimensional detection system for gas parameters based on absorption spectrum according to the present invention, compared with the first embodiment, the X-axis power assembly includes an X-axis driving motor 3 and a screw a; the X-axis driving motor 3 is arranged on the W-axis rotating table 1, two groups of X-axis driving motors 3 are arranged, an output shaft of each X-axis driving motor 3 is connected with the screw a, the screw a is provided with two groups along the X direction, and the X-axis translation table 2 is provided with threaded holes matched with the screw a. The Z-axis power assembly comprises a Z-axis driving motor 7 and a screw b; the Z-axis driving motor 7 is arranged in two groups, the two groups of Z-axis driving motors 7 are respectively arranged at the tops of the two groups of mounting posts, the output shaft of the Z-axis driving motor 7 is connected with the screw b, the screw b is vertically arranged in two groups, and screw holes matched with the screw b are formed in the Z-axis translation table a6 and the Z-axis translation table b 9. The drive structure of X axis and Z axis movement all adopts motor and screw rod's form, and this kind of form simple structure is convenient for manufacture.
Example III
As shown in fig. 5, in the state that the laser emitting module 10 and the laser detector 5 are respectively the point light source 15 and the point detector 16, the method for measuring the gas parameter in the embodiment of the gas parameter multi-dimensional detection system based on the absorption spectrum is characterized by comprising the following steps:
s11, giving a translation signal to an X-axis driving motor 3 by a computer control end, enabling a left supporting table 11 and a right supporting table 4 to carry a laser emitting module and a laser detector to scan a region to be detected in parallel along with the X-axis translation table 2, and completing all scanning detection at the same incidence angle;
s12, driving the W-axis rotary table 1, repeating S11 after finishing a given rotation angle instruction, and the like until all target rotation angles are scanned in parallel;
s13, driving the Z-axis translation stage a6 and the Z-axis translation stage b9 according to fixed step length, and repeating S11 and S12 after the right support table 4 and the left support table 11 are lifted to the target height;
s14, repeating S13 until the measurement of the target vertical height is completed.
In this embodiment, S11 and S12 may perform gridding division on the region to be measured to obtain absorption spectrum signals of different directions along the optical path of the thermal physical field of the gas to be measured with a certain vertical height; and after all steps are completed, the absorption spectrum signals of different directions of the gas thermal physical field of all fault planes of the target height along the optical path can be obtained, and the three-dimensional distribution of the thermal physical parameters of the gas thermal physical field to be detected can be obtained by combining the laser absorption spectrum tomography technology.
Example IV
As shown in fig. 6, the method for measuring gas parameters in a multidimensional manner based on the embodiment of the gas parameter multidimensional detection system based on absorption spectrum is characterized by comprising the following steps in a state that the laser emitting module 10 and the laser detector 5 are respectively a linear light source 17 and a linear matrix detector 18:
s21, the linear light source 17 passes through the area to be detected along a single path from an initial incidence angle and is received by the linear matrix detector 18 on the right supporting table 4;
s22, driving the W-axis rotary table 1, repeating S21 after a given rotation angle instruction is completed, and the like until all target rotation angles are scanned in parallel;
s23, driving the Z-axis translation stage a6 and the Z-axis translation stage b9 according to fixed step length, and repeating S21 and S22 after the right support table 4 and the left support table 11 are lifted to the target height;
s24, repeating S23 until the measurement of the target vertical height is completed.
In this embodiment, S21 and S22 may acquire absorption spectrum signals of different directions along the optical path of the thermophysical field of the gas thermophysical field to be measured with a certain vertical height; and (3) after all steps are completed, the absorption spectrum signals of different directions of the gas thermophysical fields of all fault planes of the target height along the optical path can be obtained, and the three-dimensional distribution of the gas thermophysical parameters to be detected can be obtained by combining the laser absorption spectrum tomography technology.
Example five
As shown in fig. 7, in the state that the laser emitting module 10 and the laser detector 5 are respectively the surface light source 19 and the plane matrix detector 20, the method for measuring gas parameters in the embodiment of the gas parameter multi-dimensional detection system based on the absorption spectrum is characterized by comprising the following steps:
s31, the surface light source 19 passes through the area to be detected along a single path from the initial incidence angle and is received by the plane matrix detector 20 on the right supporting table 4;
s32, driving the Z-axis translation stage a6 and the Z-axis translation stage b9 according to fixed step length, and repeating S31 when the right support table 4 and the left support table 11 are lifted to the target height;
s33, repeating S32 until the measurement of the target vertical height is completed.
In this embodiment, S31 may obtain the three-dimensional distribution of the thermal physical parameters of the gas to be measured with the same height as the surface light source 19, and all the steps may obtain the three-dimensional distribution of the thermal physical parameters of the gas to be measured with the target height.
The embodiments of the present invention have been described in detail with reference to the drawings, but the present invention is not limited thereto, and various changes can be made within the knowledge of those skilled in the art without departing from the spirit of the present invention.
Claims (2)
1. The gas parameter multidimensional detection system based on the absorption spectrum is characterized by comprising a three-dimensional translation stage module, a thermal physical field generation module to be detected and a laser module; the three-dimensional translation table module comprises a W-axis rotation table (1), an X-axis translation table (2), a right supporting table (4), a Z-axis translation table a (6), a Z-axis translation table b (9) and a left supporting table (11); the thermal physical field generating module to be tested comprises a thermal physical field (8) of the gas to be tested and a thermal physical field generating device (14); the laser module comprises a laser detector (5) and a laser emission module (10);
the W-axis rotating platform (1) is rotatably arranged on the bottom plate, and a W-axis driving motor (13) for driving the W-axis rotating platform (1) to rotate is arranged on the bottom plate; the X-axis translation tables (2) are arranged on the W-axis rotation tables (1) in a sliding manner along the X direction, the X-axis translation tables (2) are provided with two groups, the W-axis rotation tables (1) are provided with X-axis power components for driving the X-axis translation tables (2) to move, and the two groups of X-axis translation tables (2) are vertically provided with mounting columns; the Z-axis translation table a (6) and the Z-axis translation table b (9) are respectively arranged on the two groups of mounting columns in a sliding manner along the vertical direction, and a Z-axis power assembly for driving the Z-axis translation table a (6) and the Z-axis translation table b (9) to move is arranged on the mounting columns; the left supporting table (11) and the right supporting table (4) are respectively arranged on the Z-axis translation table b (9) and the Z-axis translation table a (6), and the left supporting table (11) and the right supporting table (4) are horizontally arranged; the laser emission module (10) and the laser detector (5) are respectively arranged on the left supporting table (11) and the right supporting table (4), and a laser light path (12) is formed between the laser emission module (10) and the laser detector (5); the bottom plate and the W-axis rotating table (1) are vertically provided with through holes through which a heat supply physical field generating device (14) passes, the heat physical field generating device (14) upwards generates a gas heat physical field (8) to be detected, a laser light path (12) passes through the gas heat physical field (8) to be detected, and a lifting table is arranged at the bottom of the heat physical field generating device (14);
the X-axis power assembly comprises an X-axis driving motor (3) and a screw a; the X-axis driving motor (3) is arranged on the W-axis rotating table (1), two groups of X-axis driving motors (3) are arranged, an output shaft of the X-axis driving motor (3) is connected with the screw a, the screw a is provided with two groups along the X direction, and the X-axis translation table (2) is provided with threaded holes matched with the screw a;
the Z-axis power assembly comprises a Z-axis driving motor (7) and a screw b; the Z-axis driving motors (7) are arranged in two groups, the two groups of Z-axis driving motors (7) are respectively arranged at the tops of the two groups of mounting columns, an output shaft of each Z-axis driving motor (7) is connected with a screw b, the screw b is vertically provided with two groups, and screw holes matched with the screw b are formed in each of the Z-axis translation table a (6) and the Z-axis translation table b (9);
a reinforcing rib plate is arranged between the left supporting table (11) and the Z-axis translation table b (9); a reinforcing rib plate is arranged between the right supporting table (4) and the Z-axis translation table a (6).
2. A gas parameter multidimensional measurement method of a gas parameter multidimensional detection system based on absorption spectrum according to claim 1, the laser emitting module (10) comprising a point light source (15), a line light source (17) and a surface light source (19), the laser detector (5) comprising a point detector (16), a linear matrix detector (18) and a planar matrix detector (20), characterized by comprising the steps of:
when using a point light source (15) and a point detector (16):
s11, giving a translation signal by an X-axis driving motor (3) at a computer control end, and enabling a left supporting table (11) and a right supporting table (4) to carry a laser emitting module and a laser detector to scan a region to be detected in parallel along with the X-axis translation table (2) so as to finish all scanning detection at the same incident angle;
s12, driving the W-axis rotary table (1), repeating S11 after a given rotation angle instruction is completed, and the like until parallel scanning of all target rotation angles is completed;
s13, driving a Z-axis translation stage a (6) and a Z-axis translation stage b (9) according to fixed step length, and repeating S11 and S12 after the right support platform (4) and the left support platform (11) are lifted to the target height;
s14, repeating the step S13 until the measurement of the target vertical height is completed;
performing gridding division on a region to be detected to obtain absorption spectrum signals of different directions of a thermal physical field of a gas to be detected with a certain vertical height along an optical path; after the steps S11 to S14 are completed, absorption spectrum signals of different directions of the gas thermal physical field of all fault planes of the target height along the optical path are obtained, and the three-dimensional distribution of the thermal physical parameters of the gas thermal physical field to be detected is obtained by combining a laser absorption spectrum tomography technology;
when using a linear light source (17) and a linear matrix detector (18):
s21, a linear light source (17) passes through the area to be detected along a single path from an initial incidence angle and is received by a linear matrix detector (18) on the right supporting table (4);
s22, driving the W-axis rotary table (1), repeating S21 after a given rotation angle instruction is completed, and the like until parallel scanning of all target rotation angles is completed;
s23, driving a Z-axis translation stage a (6) and a Z-axis translation stage b (9) according to fixed step length, and repeating S21 and S22 after the right support platform (4) and the left support platform (11) are lifted to the target height;
s24, repeating the step S23 until the measurement of the target vertical height is completed;
the method comprises the steps of obtaining absorption spectrum signals of a certain vertical height to-be-detected gas thermal physical field along optical paths in different directions; after the steps S21 to S24 are completed, absorption spectrum signals of different directions of a gas thermophysical field of all fault planes of a target height along an optical path are obtained, and the three-dimensional distribution of the gas thermophysical parameters to be detected is obtained by combining a laser absorption spectrum tomography technology;
when the planar light source (19) and the planar matrix detector (20) are used:
s31, a surface light source (19) passes through the area to be detected from an initial incidence angle along a single path and is received by a plane matrix detector (20) on a right supporting table (4);
s32, driving a Z-axis translation stage a (6) and a Z-axis translation stage b (9) according to fixed step length, and repeating S31 after the right support platform (4) and the left support platform (11) are lifted to the target height;
s33, repeating the step S32 until the measurement of the target vertical height is completed;
the three-dimensional distribution of the thermal physical parameters of the gas to be detected, which has the same height as the surface light source (19), is obtained, and after the steps S31 to S33 are completed, the three-dimensional distribution of the thermal physical parameters of the gas to be detected, which has the target height, is obtained.
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