CN211263143U - Multi-component gas remote measuring system - Google Patents
Multi-component gas remote measuring system Download PDFInfo
- Publication number
- CN211263143U CN211263143U CN201921561267.2U CN201921561267U CN211263143U CN 211263143 U CN211263143 U CN 211263143U CN 201921561267 U CN201921561267 U CN 201921561267U CN 211263143 U CN211263143 U CN 211263143U
- Authority
- CN
- China
- Prior art keywords
- laser
- lens
- lasers
- output
- light
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Abstract
The utility model provides a multi-component gas remote measuring system, which comprises a plurality of lasers, a beam-combining optical component, a paraboloidal mirror with a through hole, a photoelectric detector and a control module, wherein the lasers are positioned at one side of a gas mass to be measured; laser output by a plurality of lasers is input into a beam combining optical assembly to be combined; the light rays output by the beam combining optical assembly sequentially pass through the through hole of the parabolic mirror and the air mass to be detected and are diffusely reflected by the barrier to form reflected light rays; reflected light rays penetrate through the air mass to be detected and are incident to the light incident surface of the parabolic mirror and then are converged to the light incident port of the photoelectric detector; the output end of the controller is connected with the control ends of the plurality of lasers, and only one laser is controlled to output laser at the same time. The lasers are controlled in a time-sharing mode to output laser, the lasers share the light path device, the cost is greatly reduced, the occupied volume is reduced, the parabolic mirror with the through hole not only realizes lossless or low-loss passing of emitted light, but also realizes convergence of reflected light, and the light path structure is simplified.
Description
Technical Field
The utility model relates to a gaseous detection technology, concretely relates to gaseous remote measurement system of multicomponent.
Background
At present, the TDLAS (Tunable Diode Laser Absorption Spectroscopy) technology utilizes the characteristics of Tunable semiconductor Laser with narrow line width and adjustable wavelength to scan and measure the Absorption spectrum of a gas molecule 'fingerprint region', so as to inversely detect the gas concentration, has the advantages of high sensitivity, rapid detection, no interference from background gas, non-contact measurement and the like, and is widely applied to various fields of environment detection, automobile exhaust detection, industrial gas detection, polluted gas detection, combustion diagnosis and the like. However, since the tunable laser usually has a small tunable range of the optical fiber band (usually much smaller than the interval between the two gas absorption lines), the tunable diode laser absorption spectroscopy technology can generally detect only one gas.
But need detect multiple gas simultaneously in some occasions, just need many TDLAS detecting system to detect different gas respectively, for example when needing H2S, HCl gas to detect simultaneously in the chemical industry environment, need detect CH4, H2S gas simultaneously in the natural gas pipeline environment etc. ordinary TDLAS detecting system can't realize, and many systems are bulky, and the cost is higher.
SUMMERY OF THE UTILITY MODEL
In order to overcome the above-mentioned deficiencies in the prior art, it is an object of the present invention to provide a multi-component gas telemetry system.
In order to achieve the above object of the present invention, the present invention provides a multi-component gas remote measuring system, which comprises a plurality of lasers, a beam-combining optical assembly, a parabolic mirror with a through hole, a photodetector, and a control module, wherein the lasers, the beam-combining optical assembly, the parabolic mirror with a through hole, and the photodetector are located on one side of a gas mass to be measured;
the wavelengths of the laser output by the plurality of lasers are different, and the laser output by the plurality of lasers is input into a beam combining optical assembly to be combined;
the propagation direction of the emergent light beam of the beam combining optical assembly is sequentially provided with a through hole of the parabolic mirror, an air mass to be detected and an obstacle positioned on the other side of the air mass to be detected; emergent light beams of the beam combining optical assembly sequentially penetrate through the through hole of the parabolic mirror and the air mass to be detected, and are diffusely reflected by the barrier to form reflected light;
the reflected light rays penetrate through the air mass to be detected and are incident to the light incident surface of the parabolic mirror and then are converged to the light incident port of the photoelectric detector;
the output end of the controller is connected with the control ends of the plurality of lasers, and only one laser is controlled to output laser at the same time;
and the signal input end of the control module is connected with the output end of the photoelectric detector.
The beneficial effects of the above technical scheme are: only one laser outputs laser at the same time through the time-sharing control laser, the multiple lasers share the parabolic mirror and the photoelectric detector with the through hole, multiple gases can be measured, the cost is greatly reduced, the occupied volume is reduced, the difficulty of inverting the concentration of the gas to be measured according to electric signals output by the photoelectric detector is reduced, the acting interval of the laser and the gas mass to be measured cannot be changed along with the increase of the types of the gas to be measured, and the measuring precision cannot be reduced. In addition, the parabolic mirror with the through hole is arranged, so that the lossless or low-loss passing of the emitted light is realized, the convergence of the reflected light is also realized, the light path structure is greatly simplified, and the cost is reduced.
In a preferred embodiment of the present invention, the outgoing light beam of the beam combining optical assembly coaxially passes through the through hole of the parabolic mirror.
The beneficial effects of the above technical scheme are: the loss of the emergent ray bundle when passing through the through hole is reduced, so that the great part or all of the emergent ray bundle passes through the through hole, and the subsequent detection is facilitated.
In a preferred embodiment of the present invention, the beam combining optical assembly includes half-transmitting and half-reflecting lenses equal in number to the number of the lasers.
The beneficial effects of the above technical scheme are: the beam combining optical assembly built by the semi-transmitting and semi-reflecting lens has low cost and less laser power loss of the combined beam.
In a preferred embodiment of the present invention, there are 3 lasers, which are respectively a first laser, a second laser and a third laser;
the beam combining optical assembly comprises a first lens, a second lens and a third lens which are obliquely arranged at an angle of 45 degrees; the first lens, the second lens and the third lens are arranged in a row in the longitudinal direction or the vertical direction;
the first lens is positioned in the propagation direction of the laser output by the first laser, and a first incident surface of the first lens totally reflects the laser output by the first laser;
the second lens is positioned in the propagation direction of the laser output by the second laser, the first incident surface of the second lens totally reflects the laser output by the second laser, and the second incident surface of the second lens totally transmits the totally reflected light of the first lens;
the third lens is positioned in the propagation direction of the laser output by the third laser, the first incident surface of the third lens totally transmits the laser output by the third laser, and the second incident surface of the third lens totally transmits and totally reflects the totally transmitted and totally reflected light of the second lens.
The beneficial effects of the above technical scheme are: the beam combining optical assembly for combining the three lasers, which is constructed by the first lens, the second lens and the third lens, is simple in structure and convenient to implement.
The utility model discloses an in the preferred embodiment, still include with the fiber collimating mirror of laser instrument one-to-one, be provided with fiber connector on the laser instrument, fiber connector passes through optic fibre and is connected with the fiber collimating mirror that corresponds.
The beneficial effects of the above technical scheme are: the laser collimation output is convenient.
In a preferred embodiment of the present invention, the beam combining optical component comprises a fiber combiner on the wall of N1 and a fiber collimator, where N is greater than or equal to the number of lasers;
the laser output port of the laser is connected with the light input ports of the optical fiber beam combiner one by one through optical fibers, and the light output port of the optical fiber beam combiner is connected with the optical fiber collimating mirror through the optical fibers.
The beneficial effects of the above technical scheme are: the occupied time of adjusting the light path of the beam combining optical assembly in research and development is saved, and the existing optical fiber beam combiner can be used.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
fig. 1 is a schematic structural diagram of a preferred embodiment of the present invention.
Reference numerals:
1, a control module; 2 a first laser; 3 a second laser; 4 a third laser; 5, a fiber collimator; 6 beam combining optical components; 7 a parabolic mirror; 8, a photoelectric detector; 9, measuring the air mass; 10 obstacle.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary only for the purpose of explaining the present invention, and should not be construed as limiting the present invention.
In the description of the present invention, unless otherwise specified and limited, it is to be noted that the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, mechanically or electrically connected, or may be connected between two elements through an intermediate medium, or may be directly connected or indirectly connected, and specific meanings of the terms may be understood by those skilled in the art according to specific situations.
The utility model discloses a multi-component gas remote measuring system, in a preferred embodiment, as shown in figure 1, the system comprises a plurality of lasers positioned at one side of a gas mass 9 to be measured, a beam combining optical component 6, a parabolic mirror 7 with a through hole, a photoelectric detector 8 and a control module 1;
the wavelengths of the laser output by the plurality of lasers are different, and the laser output by the plurality of lasers is input into a beam combining optical assembly 6 for beam combining;
the propagation direction of the emergent light beam of the beam combining optical component 6 is sequentially provided with a through hole of the parabolic mirror 7, an air mass 9 to be detected and a barrier 10 positioned on the other side of the air mass 9 to be detected; the emergent light beam of the beam combining optical assembly 6 sequentially passes through the through hole of the parabolic mirror 7 and the air mass 9 to be measured and is diffusely reflected by the barrier 10 to form reflected light;
reflected light rays penetrate through the air mass 9 to be detected and are incident on the light incident surface of the parabolic mirror 7 and then are converged to the light incident port of the photoelectric detector 8;
the output end of the controller is connected with the control ends of the plurality of lasers, and only one laser is controlled to output laser at the same time;
the signal input end of the control module 1 is connected with the output end of the photoelectric detector 8.
In this embodiment, the laser is preferably, but not limited to, a tdl (tunable Diode laser) laser, that is, a tunable Diode laser, and the laser that outputs a corresponding laser wavelength can be selected according to an absorption characteristic peak of the gas to be detected.
In this embodiment, the gas to be measured is preferably, but not limited to, an air mass in a gas pipeline output scene, an air mass in a chemical industry environment, and the like, and may not include the component gas to be measured, or include one or more component gases to be measured.
In the present embodiment, the parabolic mirror 7 with through holes may be selected from, but not limited to, the following types: the THORLABS MPD229H-M01 product had a 2 inch diameter and a through hole in the center, with a diameter of about 5mm, for use as a transmission light path. The paraboloid is used for collecting and converging the diffuse reflection light rays, and the detection range of the system is improved. The light incident surface of the parabolic mirror 7, through which the reflected light passes the to-be-measured air mass 9, is a parabolic curved surface, which has a converging effect on the incident light, and preferably, the light receiving surface of the photodetector 8 is arranged at the converging focal point of the parabolic curved surface of the parabolic mirror 7.
In this embodiment, the photodetector 8 preferably includes, but is not limited to, an InGaAs photodiode and an amplifying circuit board, and the amplifying circuit board may adopt an existing I-V converting and amplifying circuit (i.e., a current-voltage converting and amplifying circuit), and the detailed structure thereof is not described herein. Preferably, the sensitive detection light band range of the photodetector 8 should include the wavelengths of the laser output light of a plurality of lasers.
In the present embodiment, the obstacle 10 may be any object that has not been subjected to surface machining, and may be an object in the environment where the air mass 9 to be measured is located, such as a wall, a duct wall, and the like.
In the present embodiment, the control module 1 preferably, but not limited to, includes a power supply and an embedded microcontroller electrically connected to the power supply, a lock-in amplifier, a signal generator, a laser control circuit, a data display and alarm module. The embedded microcontroller controls the signal generator and the laser control circuit to drive and modulate the laser, the embedded microcontroller and the lock-in amplifier complete demodulation of the detection signal output by the photoelectric detector 8 and processing, analyzing and storing of corresponding data, and reflects the detection result through the data display and alarm module, and the specific structure of the control module 1 and the time-sharing control principle of the laser refer to the technical content disclosed in the Chinese patent with the publication number of CN 105510275B.
In a preferred embodiment, the outgoing beam bundle of the beam combining optics 6 passes coaxially through the through-hole of the parabolic mirror 7.
In the present embodiment, it is preferable that the through hole aperture is slightly larger than the exit light beam diameter of the beam combining optical block 6.
In a preferred embodiment, as shown in fig. 1, the beam combining optics 6 comprise half-mirror lenses in an equal number to the number of lasers.
In this embodiment, the transflective lens is preferably, but not limited to, a dichroic mirror or a dichroic mirror, and is characterized by almost complete transmission of light of certain wavelengths and almost complete reflection of light of other wavelengths.
In a preferred embodiment, as shown in fig. 1, there are 3 lasers, a first laser 2, a second laser 3 and a third laser 4;
the beam combining optical assembly 6 comprises a first lens BL1, a second lens BL2 and a third lens BL3 which are obliquely arranged at an angle of 45 degrees; the first lens BL1, the second lens BL2, and the third lens BL3 are arranged in a row in the longitudinal or vertical direction;
the first lens BL1 is located in the propagation direction of the laser light output by the first laser 2, and the first incident surface of the first lens BL1 totally reflects the laser light output by the first laser 2;
the second lens BL2 is located in the propagation direction of the laser output by the second laser 3, the first incident surface of the second lens BL2 totally reflects the laser output by the second laser 3, and the second incident surface of the second lens BL2 totally transmits the totally reflected light of the first lens BL 1;
the third lens BL3 is located in the propagation direction of the laser light output by the third laser 4, the first incident surface of the third lens BL3 totally transmits the laser light output by the third laser 4, and the second incident surface of the third lens BL3 totally transmits and totally reflects the light rays totally transmitted and totally reflected by the second lens BL 2.
In the present embodiment, the first lens BL1 totally reflects the output laser light λ 1 from the first laser 2; the second lens BL2 totally reflects the laser λ 2 output by the second laser 3 and totally transmits the laser λ 1 output by the first laser 2; the third lens BL3 totally reflects the laser beam λ 1 output from the first laser 2, totally reflects the laser beam λ 2 output from the second laser 3, and totally transmits the laser beam λ 3 output from the third laser 4. Each laser correspondingly detects one gas, and under the control of the controller, the three lasers work in a time-sharing mode, namely the first laser 2 works at the first moment; the second laser 3 works at the second moment; at the third moment, the third laser 4 works; the multi-path laser shares the parabolic mirror 7 and the photoelectric detector 8 to complete the remote measurement of the multi-component gas.
In a preferred embodiment, the laser further comprises optical fiber collimating mirrors 5 corresponding to the lasers one by one, wherein optical fiber connectors are arranged on the lasers, and the optical fiber connectors are connected with the corresponding optical fiber collimating mirrors 5 through optical fibers.
In the present embodiment, the optical fiber connector and the optical fiber interface of the fiber collimator 5 are preferably but not limited to FC/APC joints, and the fiber collimator 5 may be selected from existing products.
In a preferred embodiment, the beam combining optical assembly 6 comprises a fiber combiner on N (Pistigman) 1 and a fiber collimator 5, wherein N is greater than or equal to the number of lasers, and is a positive integer;
the laser output port of the laser is connected with the light input ports of the optical fiber beam combiner one by one through optical fibers, and the light output port of the optical fiber beam combiner is connected with the optical fiber collimating mirror 5 through the optical fibers.
In this embodiment, the optical fiber combiner of N-KHz 1 is selected from the existing products, such as the single mode fiber coupler of Thorlabs.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
While embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.
Claims (6)
1. A multi-component gas remote measuring system is characterized by comprising a plurality of lasers, beam-combining optical assemblies, a parabolic mirror with a through hole, a photoelectric detector and a control module, wherein the lasers, the beam-combining optical assemblies, the parabolic mirror with the through hole and the photoelectric detector are positioned on one side of a gas mass to be measured;
the wavelengths of the laser output by the plurality of lasers are different, and the laser output by the plurality of lasers is input into a beam combining optical assembly to be combined;
the propagation direction of the emergent light beam of the beam combining optical assembly is sequentially provided with a through hole of the parabolic mirror, an air mass to be detected and an obstacle positioned on the other side of the air mass to be detected; emergent light beams of the beam combining optical assembly sequentially penetrate through the through hole of the parabolic mirror and the air mass to be detected, and are diffusely reflected by the barrier to form reflected light;
the reflected light rays penetrate through the air mass to be detected and are incident to the light incident surface of the parabolic mirror and then are converged to the light incident port of the photoelectric detector;
the output end of the controller is connected with the control ends of the plurality of lasers, and only one laser is controlled to output laser at the same time;
and the signal input end of the control module is connected with the output end of the photoelectric detector.
2. The multi-component gas telemetry system of claim 1, wherein an exit beam of the beam combining optics assembly passes coaxially through the aperture of the parabolic mirror.
3. The multi-component gas telemetry system of claim 1, wherein the beam-combining optical assembly includes a number of semi-transparent semi-reflective lenses equal to the number of lasers.
4. The multi-component gas telemetry system of claim 3, wherein there are 3 of said lasers, a first laser, a second laser and a third laser;
the beam combining optical assembly comprises a first lens, a second lens and a third lens which are obliquely arranged at an angle of 45 degrees; the first lens, the second lens and the third lens are arranged in a row in the longitudinal direction or the vertical direction;
the first lens is positioned in the propagation direction of the laser output by the first laser, and a first incident surface of the first lens totally reflects the laser output by the first laser;
the second lens is positioned in the propagation direction of the laser output by the second laser, the first incident surface of the second lens totally reflects the laser output by the second laser, and the second incident surface of the second lens totally transmits the totally reflected light of the first lens;
the third lens is positioned in the propagation direction of the laser output by the third laser, the first incident surface of the third lens totally transmits the laser output by the third laser, and the second incident surface of the third lens totally transmits and totally reflects the totally transmitted and totally reflected light of the second lens.
5. The multi-component gas telemetry system of one of claims 1-4, further comprising fiber optic collimating mirrors in one-to-one correspondence with the lasers, the lasers having fiber optic connectors disposed thereon, the fiber optic connectors being connected to the corresponding fiber optic collimating mirrors by optical fibers.
6. The multi-component gas telemetry system of claim 1 or 2, wherein the beam-combining optical assembly comprises a fiber combiner for N (PIKHz 1) and fiber collimating mirrors, wherein N is equal to or greater than the number of lasers;
the laser output port of the laser is connected with the light input ports of the optical fiber beam combiner one by one through optical fibers, and the light output port of the optical fiber beam combiner is connected with the optical fiber collimating mirror through the optical fibers.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921561267.2U CN211263143U (en) | 2019-09-19 | 2019-09-19 | Multi-component gas remote measuring system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921561267.2U CN211263143U (en) | 2019-09-19 | 2019-09-19 | Multi-component gas remote measuring system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211263143U true CN211263143U (en) | 2020-08-14 |
Family
ID=71954474
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921561267.2U Active CN211263143U (en) | 2019-09-19 | 2019-09-19 | Multi-component gas remote measuring system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN211263143U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112748084A (en) * | 2021-01-04 | 2021-05-04 | 安徽中科华仪科技有限公司 | Remote sensing detection method for motor vehicle exhaust based on infrared combined laser |
-
2019
- 2019-09-19 CN CN201921561267.2U patent/CN211263143U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112748084A (en) * | 2021-01-04 | 2021-05-04 | 安徽中科华仪科技有限公司 | Remote sensing detection method for motor vehicle exhaust based on infrared combined laser |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JP6781248B2 (en) | Gas monitoring system and method for determining the characteristics of the target gas | |
| US4839527A (en) | Optical-fibre smoke detection/analysis system | |
| CN100468049C (en) | Detection method for Optical-fiber transmitting infrared absorption type methane gas | |
| US7005645B2 (en) | Apparatus and methods for launching and receiving a broad wavelength range source | |
| CN103411919A (en) | System and method for simultaneously monitoring multiple components of building fire early-stage characteristic gases | |
| CN103604773A (en) | Laser beam combiner for simultaneously detecting various types of gas of TDLAS (Tunable Diode Laser Absorption Spectroscopy) | |
| CN104330190B (en) | TDLAS gas temperature measurement detection device based on optical light-splitting system | |
| CN103499545A (en) | Semiconductor laser gas detection system with function of gas reference cavity feedback compensation | |
| CN108061722A (en) | The detection device and detection method of a kind of carbonomonoxide concentration | |
| JP2016033484A (en) | Optical system for branching reference light | |
| CN211263143U (en) | Multi-component gas remote measuring system | |
| CN113607687A (en) | Single-ended diffuse reflection multi-component measurement system based on gas absorption spectrum | |
| KR20190048836A (en) | Alignment System for TDLAS of Simultaneous Measurement of Multicomponent Gas using Micro Optical Passage | |
| CA2139203C (en) | Two-way line monitor | |
| CN110231307A (en) | Open light path gas concentration detection apparatus and method based on TDLAS technology | |
| CN209373241U (en) | Efficient light path folded device and the highly sensitive gas sensor of miniaturization | |
| CN110736713A (en) | Gas analyzer and gas analyzing method | |
| CN109597192A (en) | Efficient light path folded device and the highly sensitive gas sensor of miniaturization | |
| CN114354538A (en) | Laser gas sensing device and gas detection method | |
| Yu et al. | Long-distance in-situ near-infrared gas sensor system using a fabricated fiber-coupled Herriott cell (FC-HC) operating within 1.5–2.3 μm | |
| JPH09282577A (en) | Gas detector | |
| RU2336573C1 (en) | Fire alarm device | |
| CN218974168U (en) | Coaxial multi-wavelength laser for real-time detection of multi-component gas | |
| CN101281126B (en) | Optical fiber type optical heterodyne method evanscent wave cavity declining spectral analysis apparatus | |
| US20230314312A1 (en) | Combustion-zone chemical sensing system and associated method |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |