CN107561016B - System for detecting gas concentration by laser - Google Patents
System for detecting gas concentration by laser Download PDFInfo
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- CN107561016B CN107561016B CN201710708605.XA CN201710708605A CN107561016B CN 107561016 B CN107561016 B CN 107561016B CN 201710708605 A CN201710708605 A CN 201710708605A CN 107561016 B CN107561016 B CN 107561016B
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Abstract
The invention belongs to the technical field of laser, and particularly relates to a system for detecting gas concentration by laser, which sequentially comprises the following components according to the advancing direction of a light path: the laser system comprises a laser source, a reflecting system I, a reflecting system II, an independent reflecting system I, an independent reflecting system II, a reflecting system III and a receiving device, wherein the reflecting system I is used for emitting laser rays emitted by the laser source to the reflecting system II at different angles, and the reflecting system II is used for changing the laser rays emitted from the reflecting system I at different angles into two groups of rays in different directions; the independent reflecting systems are divided into two groups, the two groups of light rays from the second reflecting system are respectively received, the two groups of light rays are mutually crossed to form a two-dimensional measuring area through the reflection of the independent reflecting systems, and reach the third reflecting system after being reflected by the second independent reflecting system, and are reflected by the third reflecting system and converged to the receiving device.
Description
Technical Field
The invention belongs to the technical field of laser, and particularly relates to a system for detecting gas concentration by laser.
Background
In the existing process of detecting gas concentration by laser, the route arrangement of the laser basically has two methods of one-way and multi-way. For the single-pass method, only one laser beam is supplied from each laser source and received at the other end of the measured space by the corresponding receiving device. In the process of detecting the gas concentration by the laser, the average concentration on one light path can be detected, and the distribution condition of the gas concentration on a two-dimensional plane cannot be detected. The multi-path light source can realize the measurement of the concentration distribution on the cross section. The multi-path light source has two realization methods: the method is that each path of light source uses a separate laser source, and the laser is received by a receiving sensor after passing through a measuring area. The laser system emits and receives a laser ray, the utilization rate of the light source is low, and the price of the system is greatly increased due to the use of a plurality of laser sources. The other method is that a laser source is split to generate a plurality of laser beams, the laser beams pass through the measured space, and the other end of the measured space is received by a corresponding receiving device. In the process of detecting the gas concentration by using the laser, one laser source is divided into multiple paths, so that the light energy of each path is reduced, the signal quality is reduced, and the adverse effect on the measurement is generated.
Disclosure of Invention
In view of this, the present invention provides a system for detecting gas concentration by laser, sequentially including, according to the direction of light path advance: the laser system comprises a laser source, a reflecting system I, a reflecting system II, an independent reflecting system I, an independent reflecting system II, a reflecting system III and a receiving device, wherein the reflecting system I is used for emitting laser rays emitted by the laser source to the reflecting system II at different angles, and the reflecting system II is used for changing the laser rays emitted from the reflecting system I at different angles into two groups of rays in different directions; the independent reflecting systems are divided into two groups, the two groups of light rays from the second reflecting system are respectively received, the two groups of light rays are mutually crossed to form a two-dimensional measuring area through the reflection of the independent reflecting systems, and reach the third reflecting system after being reflected by the second independent reflecting system, and are reflected by the third reflecting system and converged to the receiving device.
The reflective system includes a mirror coupled to a motor.
The reflecting system is a prism.
The second light reflecting system and/or the third light reflecting system are formed by splicing two half-paraboloid reflectors, and the focuses of the two half-paraboloid reflectors are overlapped.
The independent reflecting system I and/or the independent reflecting system II are/is composed of a plurality of same plane reflectors, and the angle of each plane reflector is adjustable; the independent light reflecting system and the independent light reflecting system are positioned on two sides of the two-dimensional measuring area.
The receiving device is located at the focal position of the third reflecting system.
The invention has the beneficial effects that: the gas concentration distribution on the two-dimensional plane in the region to be measured can be measured, the real-time performance is good, and the requirement of actual production is met. Can adapt to areas to be measured with different sizes, and has wide application range. The components of the system for detecting the gas concentration by laser such as the laser source and the receiving device can be placed at a place far away from the measurement area, and when the measurement area is in severe conditions such as high temperature and corrosivity, the measurement can still be completed without influencing the measurement precision. The number of the laser sources and the receiving devices is reduced, the laser sources and the receiving devices can transmit and receive a plurality of laser rays, and the economy of the measuring system is improved. The number of laser rays in the region to be detected is adjustable, and the requirements of different industrial precisions are met.
Drawings
FIG. 1 is a schematic diagram of a system for detecting gas concentration by laser according to the present invention;
FIG. 2 is a schematic structural diagram of a first reflective system according to an embodiment of the present invention;
FIG. 3 is a schematic structural diagram of a first reflective system according to an embodiment of the present invention;
FIG. 4 is a schematic structural diagram of a first reflective system according to an embodiment of the present invention;
FIG. 5 is a schematic structural diagram of a system for detecting gas concentration by laser according to an embodiment of the present invention;
reference numerals:
1-a laser source; 2, the light reflecting system is uniform; 3-a second reflecting system; 4-laser light; 5-gas to be detected; 6-area to be measured; 7, the independent light reflecting systems are unified; 8, an independent light reflecting system II; 9-reflecting system three; 10-a receiving device.
Detailed Description
The embodiments are described in detail below with reference to the accompanying drawings.
As shown in fig. 1, the present invention provides a system for detecting gas concentration by laser, which sequentially comprises, according to the direction of light path advance: the laser system comprises a laser source, a reflecting system I, a reflecting system II, an independent reflecting system I, an independent reflecting system II, a reflecting system III and a receiving device, wherein the reflecting system I is used for emitting laser rays emitted by the laser source to the reflecting system II at different angles, and the reflecting system II is used for changing the laser rays emitted from the reflecting system I at different angles into two groups of rays in different directions; the independent reflecting systems are divided into two groups, the two groups of light rays from the second reflecting system are respectively received, the two groups of light rays are mutually crossed to form a two-dimensional measuring area through the reflection of the independent reflecting systems, and reach the third reflecting system after being reflected by the second independent reflecting system, and are reflected by the third reflecting system and converged to the receiving device.
As shown in fig. 2, in the system for detecting gas concentration by laser, a light reflecting system includes a plane mirror and a motor, wherein the plane mirror is inclined at a certain angle, the plane mirror and the motor are connected through a connecting rod, a laser source is fixed on a base of the light reflecting system through a fixing bracket, and laser light emitted from the laser source is vertically incident on a mirror surface of the plane mirror.
The point of the first reflecting system, where the laser beam enters the planar reflector, is located at the focus of the second reflecting system, so as to ensure that the emergent beams are parallel to each other.
The second reflecting system is formed by splicing two half paraboloids, and the focal points of the two half paraboloids are superposed.
The independent reflecting system and the independent reflecting system are both composed of a plurality of identical plane reflectors, and the angle of each plane reflector is adjustable. The independent light reflecting system and the independent light reflecting system are positioned on two sides of the two-dimensional measuring area.
The third reflecting system is formed by splicing two half paraboloids, and the focal points of the two half paraboloids are superposed.
The receiving device is positioned at the focal position of the reflecting system III.
As shown in fig. 3, in the system for detecting gas concentration by laser, a reflective system includes a polygonal mirror and a motor, the polygonal mirror and the motor are connected through a connecting rod, a laser source is fixed on a side surface of the reflective system through a fixing bracket, and laser light emitted from the laser source is perpendicularly incident on a mirror surface of the polygonal mirror.
As shown in fig. 4, in the system for detecting gas concentration by using laser, the first reflective system is a prism, and laser light emitted from the laser source passes through the prism to form a fan-shaped beam.
As shown in fig. 5, an embodiment of the invention provides a system for detecting gas concentration by using laser, which includes a laser source, a first reflective system, a second reflective system, a first independent reflective system, a second independent reflective system, and a third reflective system. In the system for detecting gas concentration by laser, the laser beam emitted by the second reflecting system is not parallel to the region to be detected, and the rest is the same as that in fig. 1.
The above embodiments are only preferred embodiments of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are also within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (5)
1. A system for detecting gas concentration by laser is characterized by sequentially comprising the following components according to the advancing direction of an optical path: the laser system comprises a laser source, a reflecting system I, a reflecting system II, an independent reflecting system I, an independent reflecting system II, a reflecting system III and a receiving device, wherein the reflecting system I is used for emitting laser rays emitted by the laser source to the reflecting system II at different angles, and the reflecting system II is used for changing the laser rays emitted from the reflecting system I at different angles into two groups of rays in different directions; the independent reflection systems are divided into two groups, and the two groups of light rays from the second reflection system are respectively received, the two groups of light rays are mutually crossed to form a two-dimensional measurement area through the reflection of the independent reflection systems, and reach the third reflection system after being reflected by the second reflection system, and are reflected by the third reflection system and converged to the receiving device;
the second light reflecting system and/or the third light reflecting system are formed by splicing two half-paraboloid reflectors, and the focuses of the two half-paraboloid reflectors are overlapped.
2. The system of claim 1, wherein the reflective system comprises a mirror coupled to a motor.
3. The system of claim 1, wherein the light reflecting system is a prism.
4. The system as claimed in claim 1, wherein the independent reflective system and/or the independent reflective system II is composed of a plurality of same plane reflectors, and the angle of each plane reflector is adjustable; the independent light reflecting system and the independent light reflecting system are positioned on two sides of the two-dimensional measuring area.
5. The system of claim 1, wherein the receiving device is located at a focal point of the reflective system III.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710708605.XA CN107561016B (en) | 2017-08-17 | 2017-08-17 | System for detecting gas concentration by laser |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710708605.XA CN107561016B (en) | 2017-08-17 | 2017-08-17 | System for detecting gas concentration by laser |
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| Publication Number | Publication Date |
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| CN107561016A CN107561016A (en) | 2018-01-09 |
| CN107561016B true CN107561016B (en) | 2020-06-09 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201710708605.XA Expired - Fee Related CN107561016B (en) | 2017-08-17 | 2017-08-17 | System for detecting gas concentration by laser |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101393382A (en) * | 2007-09-18 | 2009-03-25 | 中强光电股份有限公司 | Projection display and light source module thereof |
| CN102262843A (en) * | 2011-08-22 | 2011-11-30 | 张秋霞 | Dot matrix display conversion device |
| CN102564343A (en) * | 2011-12-29 | 2012-07-11 | 中国科学院长春光学精密机械与物理研究所 | Detection device for surface-shape errors of solar trench type curved surface reflector |
| CN102768024A (en) * | 2012-07-05 | 2012-11-07 | 哈尔滨工业大学 | Confocal measuring device based on separable reflector set |
| CN102896421A (en) * | 2012-07-30 | 2013-01-30 | 沈明亚 | LCOS (liquid crystal on silicon) laser micromachining system and laser micromachining method |
| CN103869385A (en) * | 2014-04-02 | 2014-06-18 | 昆明理工大学 | Method and device for detecting rain amount through laser |
| CN106770145A (en) * | 2017-03-10 | 2017-05-31 | 上海理工大学 | Multi-path frequency-division duplicating fluorescence microscopy detection method is realized based on DMD |
-
2017
- 2017-08-17 CN CN201710708605.XA patent/CN107561016B/en not_active Expired - Fee Related
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101393382A (en) * | 2007-09-18 | 2009-03-25 | 中强光电股份有限公司 | Projection display and light source module thereof |
| CN102262843A (en) * | 2011-08-22 | 2011-11-30 | 张秋霞 | Dot matrix display conversion device |
| CN102564343A (en) * | 2011-12-29 | 2012-07-11 | 中国科学院长春光学精密机械与物理研究所 | Detection device for surface-shape errors of solar trench type curved surface reflector |
| CN102768024A (en) * | 2012-07-05 | 2012-11-07 | 哈尔滨工业大学 | Confocal measuring device based on separable reflector set |
| CN102896421A (en) * | 2012-07-30 | 2013-01-30 | 沈明亚 | LCOS (liquid crystal on silicon) laser micromachining system and laser micromachining method |
| CN103869385A (en) * | 2014-04-02 | 2014-06-18 | 昆明理工大学 | Method and device for detecting rain amount through laser |
| CN106770145A (en) * | 2017-03-10 | 2017-05-31 | 上海理工大学 | Multi-path frequency-division duplicating fluorescence microscopy detection method is realized based on DMD |
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| CN107561016A (en) | 2018-01-09 |
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