CN219694917U - Methane sensor based on tunable semiconductor laser absorption spectrum technology - Google Patents
Methane sensor based on tunable semiconductor laser absorption spectrum technology Download PDFInfo
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- CN219694917U CN219694917U CN202321228669.7U CN202321228669U CN219694917U CN 219694917 U CN219694917 U CN 219694917U CN 202321228669 U CN202321228669 U CN 202321228669U CN 219694917 U CN219694917 U CN 219694917U
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- semiconductor laser
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- tunable semiconductor
- reflecting
- detector
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- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 title claims abstract description 76
- 239000004065 semiconductor Substances 0.000 title claims abstract description 59
- 238000005516 engineering process Methods 0.000 title claims abstract description 13
- 238000000862 absorption spectrum Methods 0.000 title claims abstract description 12
- 238000001285 laser absorption spectroscopy Methods 0.000 claims description 22
- 238000007789 sealing Methods 0.000 claims description 9
- 238000000034 method Methods 0.000 claims description 6
- 238000009423 ventilation Methods 0.000 claims description 3
- 238000009434 installation Methods 0.000 description 6
- 238000010586 diagram Methods 0.000 description 5
- 230000005540 biological transmission Effects 0.000 description 4
- 238000010521 absorption reaction Methods 0.000 description 2
- 230000035945 sensitivity Effects 0.000 description 2
- 238000000041 tunable diode laser absorption spectroscopy Methods 0.000 description 2
- 238000013461 design Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000003595 spectral effect Effects 0.000 description 1
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- Investigating Or Analysing Materials By Optical Means (AREA)
Abstract
The utility model discloses a methane sensor based on tunable semiconductor laser absorption spectrum technology, which comprises a shell; a gas receiving portion having a laser end and a detector end; a tunable semiconductor laser; a photodetector; the gas housing portion includes: splicing pipes; the reflection joint comprises two straight pipes which are mutually perpendicular and are connected at one end; each splicing pipe and each reflecting joint are spliced in a mutually spliced way; the outer side of the joint of the two straight pipes of the reflecting joint is provided with a notch; the reflecting sheet and the two straight pipes of the reflecting joint form an included angle of 135 degrees; the laser emitted by the tunable semiconductor laser is emitted into the gas accommodating part from the laser end, is transmitted along the central axis of each splicing pipe, is reflected by each reflecting sheet, and is emitted from the detector end to be received by the photoelectric detector. The utility model can be spliced according to actual needs, and is very convenient to install and use.
Description
Technical Field
The utility model relates to a methane sensor, in particular to a methane sensor based on tunable semiconductor laser absorption spectrum technology.
Background
The TDLAS (Tunable Diode Laser Absorption Spectroscopy) technology acquires the spectral characteristics of the gas to be detected by detecting the change of the absorption and transmission light intensity of the gas, so that the component and the content of the gas are detected, and the method has the advantages of high sensitivity, high resolution, real-time response, non-contact measurement and the like, and therefore, the method has wide application in the field of methane gas detection. In order to increase the sensitivity of the gas absorption by the laser, it is necessary to increase the length of the gas cavity. In order to reduce the length of the gas cavity, a plurality of reflectors are generally arranged in the gas cavity, so that light emitted by the tunable semiconductor laser is reflected back and forth in the reflectors and then emitted, and the purpose of increasing the laser transmission stroke is achieved. However, the position of the reflector is fixed because the gas cavity is fixed, the reflector cannot be adjusted according to actual needs, the use is very inconvenient, and the angle of each reflector needs to be accurately installed when the reflector is arranged in the gas cavity, so that the installation is very inconvenient.
Disclosure of Invention
The utility model provides a methane sensor based on a tunable semiconductor laser absorption spectrum technology, which aims to solve the technical problem that the use and the installation of the methane sensor based on the tunable semiconductor laser absorption spectrum technology are very inconvenient in the prior art.
In order to solve the technical problems, the technical scheme adopted by the utility model is to design the methane sensor based on the tunable semiconductor laser absorption spectrum technology, which comprises a shell, wherein the methane sensor based on the tunable semiconductor laser absorption spectrum technology further comprises:
a gas receiving portion having a laser end and a detector end;
a tunable semiconductor laser facing a laser end of the gas accommodating portion;
the photoelectric detector is arranged opposite to the detector end of the gas accommodating part;
the gas housing portion includes:
a splice tube which is a straight tube and includes a plurality of;
the reflection joint comprises a plurality of reflection joints, wherein each reflection joint comprises two straight pipes which are mutually perpendicular and are connected at one end; each splicing pipe and each reflecting joint are spliced in a mutually spliced way; the outer side of the joint of the two straight pipes of the reflecting joint is provided with a notch, and the notch and the two straight pipes of the reflecting joint form an included angle of 135 degrees;
the reflecting sheet is arranged at the notch and seals the notch, and the reflecting sheet and the two straight pipes of the reflecting joint form an included angle of 135 degrees;
the laser emitted by the tunable semiconductor laser is emitted into the gas accommodating part from the laser end, is transmitted along the central axis of each splicing pipe, is reflected by each reflecting sheet, and is emitted from the detector end to be received by the photoelectric detector.
The splicing tube is a cylindrical straight tube, and the two straight tubes of the reflecting joint are also cylindrical straight tubes.
The reflection joint also comprises plug-in connection parts arranged at two ends, and one end of the plug-in connection pipe is plugged in the plug-in connection parts of the reflection joint.
The housing includes:
the upper shell is characterized in that the lower surface of the upper shell is upwards recessed to form a first cavity, an air pipe socket which is arranged on the side surface of the upper shell and communicated with the first cavity, and a positioning column which is downwards protruded from the upper surface of the first cavity; the upper surface of the upper shell is provided with a pin hole;
the lower shell is detachably and fixedly connected with the lower end of the upper shell and seals the first cavity;
the methane sensor based on the tunable semiconductor laser absorption spectrum technology further comprises a circuit board, wherein the circuit board is fixed on the lower surface of the positioning column; the circuit board is provided with an electric contact pin which is inserted into the contact pin hole;
the tunable semiconductor laser and the photoelectric detector are arranged in the first cavity and positioned on the circuit board, and the gas accommodating part is clamped and fixed between the lower shell and the circuit board.
The lower shell is provided with a lower shell cavity formed by downwards sinking the upper surface of the lower shell, the lower shell is provided with a plurality of lower shell holes communicated with the lower shell cavity, and the splicing pipe is provided with a plurality of ventilation holes communicated with the lower shell cavity.
The circuit board is provided with a laser hole and a detector hole, and the laser end and the detector end are respectively positioned at the laser hole and the detector hole.
The gas housing portion further includes:
the air pipe connectors are respectively arranged at two ends of the gas accommodating part and are provided with a first connector, a second connector communicated with the first connector and a third connector communicated with the first connector and the second connector; the first joint coincides with the central axis of the second joint; the laser end and the detector end are respectively positioned at the end parts of the first joints of the two air pipe joints.
The tunable semiconductor laser is in sealing connection with the laser end, and the photoelectric detector is in sealing connection with the detector end.
And a sealing ring is arranged between the reflecting sheet and the notch.
The notch is a plane notch, and the plane where the notch is located is perpendicular to the plane formed by the central axes of the two straight pipes of the reflecting joint.
The gas accommodating cavity is provided with a laser end and a detector end, and the tunable semiconductor laser is opposite to the laser end of the gas accommodating part; the photoelectric detector is arranged opposite to the detector end of the gas accommodating part. The gas accommodating part comprises splicing pipes, reflecting joints and reflecting sheets, and each splicing pipe and each reflecting joint are spliced in a mutually spliced manner; the outer side of the joint of the two straight pipes of the reflecting joint is provided with a notch, and the notch and the two straight pipes of the reflecting joint form an included angle of 135 degrees; the reflector plate is arranged at the notch and seals the notch, and the reflector plate and two straight pipes connected with the reflecting joint form an included angle of 135 degrees. Laser emitted by the tunable semiconductor laser is emitted into the gas accommodating part from the laser end, is transmitted along the central axis of each splicing pipe, is reflected by each reflecting sheet, and is emitted from the detector end to be received by the photoelectric detector. Therefore, the gas containing part can be formed by conveniently splicing according to actual needs, and the reflecting sheet can be accurately installed only by being installed at the notch, so that the installation and the use are very convenient.
Drawings
The utility model is described in detail below with reference to examples and figures, wherein:
FIG. 1 is a block diagram of a first embodiment of a methane sensor of the present utility model based on tunable semiconductor laser absorption spectroscopy;
FIG. 2 is a cross-sectional view of a first embodiment of a methane sensor of the present utility model based on tunable semiconductor laser absorption spectroscopy;
FIG. 3 is an exploded view of a first embodiment of a methane sensor of the present utility model based on tunable semiconductor laser absorption spectroscopy;
FIG. 4 is an exploded view of another view of an embodiment of a methane sensor based on tunable semiconductor laser absorption spectroscopy in accordance with the present utility model;
FIG. 5 is a block diagram of an embodiment of a methane sensor based on tunable semiconductor laser absorption spectroscopy of the present utility model with a housing removed;
FIG. 6 is a block diagram of a reflective joint, a reflective sheet and a seal ring of an embodiment of a methane sensor based on tunable semiconductor laser absorption spectroscopy in accordance with the present utility model;
FIG. 7 is a block diagram of a second embodiment of a methane sensor of the present utility model based on tunable semiconductor laser absorption spectroscopy;
FIG. 8 is an exploded view of a second embodiment of a methane sensor of the present utility model based on tunable semiconductor laser absorption spectroscopy;
FIG. 9 is an exploded view of another view of an embodiment of a methane sensor based on tunable semiconductor laser absorption spectroscopy in accordance with the present utility model;
FIG. 10 is a block diagram of a second embodiment of a methane sensor of the present utility model based on tunable semiconductor laser absorption spectroscopy with the housing removed.
Detailed Description
Specific embodiments of the utility model are further described below with reference to the accompanying drawings:
example 1
Please refer to fig. 1 to 6. The utility model relates to a methane sensor based on a tunable semiconductor laser absorption spectrum technology, which comprises a shell 1, a gas accommodating part 2, a tunable semiconductor laser 3 and a photoelectric detector 4. Wherein:
the housing 1 includes an upper case 11 and a lower case 12. The upper shell 11 is detachably connected to the lower shell 12, and in this embodiment, the upper shell 11 is screwed to the lower shell 12.
The gas housing 2 has a laser end 28 and a detector end 29. The laser end 28 and the detector end 29 are provided at both ends of the gas containing portion, respectively. The gas containing part is used for containing gas to be detected.
The tunable semiconductor laser 3 is opposite to the laser end of the gas housing. The tunable semiconductor laser is used for emitting laser light, and in this embodiment, the laser light emitted by the tunable semiconductor laser is perpendicularly emitted into the gas accommodating portion.
The photoelectric detector 4 is arranged opposite to the detector end of the gas accommodating part. The photoelectric detector is used for receiving laser emitted by the tunable semiconductor laser, the laser passes through the gas accommodating part, is absorbed by the gas in the gas accommodating part and then is emitted to the photoelectric detector, the attenuation of corresponding light intensity is detected by the photoelectric detector, and then the concentration of methane and whether methane exists in the gas can be obtained through subsequent processing.
The gas housing part 2 includes a splice tube 21, a reflection joint 22, and a reflection sheet 23. Wherein:
the splice tube 21 is a straight tube and includes a plurality of.
The reflecting joint 22 comprises a plurality of reflecting joints 22, and the reflecting joint 22 comprises two straight pipes 221 which are mutually perpendicular and are connected at one end; each splicing pipe and each reflecting joint are spliced in a mutually spliced way; the outer side of the joint of the two straight pipes of the reflecting joint 22 is provided with a notch 222, and the notch forms an included angle of 135 degrees with the two straight pipes of the reflecting joint.
In this embodiment, the notch 222 is a planar notch, and the plane where the notch is located is perpendicular to the plane formed by the central axes of the two straight pipes of the reflective connector.
The reflecting sheet 23 is arranged at the notch and seals the notch, and the reflecting sheet and the two straight pipes of the reflecting joint form an included angle of 135 degrees. Therefore, the laser is injected along the central axis of one straight pipe of the reflecting joint, and the injected laser and the reflecting sheet are injected at an angle of 45 degrees, and after reflection, the laser is just injected along the central axis of the other straight pipe, so that continuous transmission of the laser among all the splicing pipes can be realized through the reflecting sheet.
The laser emitted by the tunable semiconductor laser is emitted into the gas accommodating part from the laser end, is transmitted along the central axis of each splicing pipe, is reflected by each reflecting sheet, and is emitted from the detector end to be received by the photoelectric detector.
Through the concatenation of concatenation pipe and reflection joint, not only can make gaseous holding portion splice in the coplanar, can also splice into multilayer three-dimensional structure to can splice according to actual need convenient, and the reflector plate only need install can accurately realize the installation of reflector plate in incision department, installation and use are all very convenient.
In this embodiment, the concatenation pipe is cylindrical straight tube, two sections straight tube of reflection joint also are cylindrical straight tube, set up to cylindrical tube and can conveniently produce and install, also can guarantee the axiality of concatenation pipe and reflection joint simultaneously, avoid laser at transmission in-process skew direction.
In this embodiment, the reflective connector 22 further includes a plugging portion 223 disposed at two ends, and one end of the plugging tube is plugged with the plugging portion of the reflective connector. The diameter of the inserting part is smaller than that of the splicing pipe, and the inserting part is directly inserted into the splicing pipe to splice the splicing pipe and the reflecting joint. Under the condition that the sealing is needed, a sealing ring can be arranged between the plug-in connection part and the splicing pipe.
In this embodiment, the lower surface of the upper shell 11 is recessed upward to form a first cavity 111, an air pipe socket 112 disposed on the side surface of the upper shell and communicating with the first cavity, and a positioning column 113 protruding downward from the upper surface of the first cavity. The upper surface of the upper shell 11 is provided with a pin hole 114, and the air pipe socket 112 is used for externally connecting an air pipe.
The lower shell 12 is detachably and fixedly connected with the lower end of the upper shell and seals the first cavity. In this embodiment, the upper surface of the lower case is recessed downward to form a lower case cavity 121.
In this embodiment, the methane sensor based on the tunable semiconductor laser absorption spectrum technology further includes a circuit board 5, where the circuit board 5 is fixed on the lower surface of the positioning column, and an electrical pin 50 is disposed on the circuit board and is inserted into the pin hole 114, and is mainly used for deriving signals. The tunable semiconductor laser and the photoelectric detector are arranged in the first cavity and positioned on the circuit board, and the gas accommodating part is clamped and fixed between the lower shell and the circuit board, so that a fixing structure is not required to be arranged specially for fixing the gas accommodating part.
The circuit board 5 is provided with a laser hole 51 and a detector hole 52, at which the laser end and the detector end are positioned, respectively.
In this embodiment, the gas container 2 further comprises a gas pipe joint 24. The air pipe joint 24 comprises two air pipe joints 24 respectively arranged at two ends of the air accommodating part, and the air pipe joint 24 is provided with a first joint 241, a second joint 242 communicated with the first joint and a third joint 243 communicated with the first joint and the second joint; the first joint coincides with the central axis of the second joint; the laser end and the detector end are respectively positioned at the end parts of the first joints of the two air pipe joints.
The first joint is used for installing a laser end or a detector end, the second joint is used for being spliced with the reflecting joint, and the third joint is used for being connected with an air pipe, so that an air inlet and an air outlet are formed. So that the gas to be detected can enter through the gas inlet and be sent out through the gas outlet. An air pump may be generally provided for feeding the gas into the gas receiving portion through the air pipe. In this embodiment, the third joint 243 is connected to the outside of the housing by an air tube that is inserted into the air tube socket 112 to connect to the outside of the housing.
In this specific embodiment, the tunable semiconductor laser is connected to the laser end in a sealed manner, and the photodetector is connected to the detector end in a sealed manner.
In order to avoid leakage of gas from the reflector plate, a sealing ring 25 is arranged between the reflector plate 23 and the notch 222. A recessed seal groove 2221 may be provided at the incision for placement of the seal ring.
Example two
Please refer to fig. 7 to 10. In this embodiment, the gas is not sealed in the gas accommodating portion, but is diffused directly into the gas accommodating portion through the housing. The methane sensor based on the tunable semiconductor laser absorption spectroscopy technique includes a housing 91, a gas accommodating portion 92, a tunable semiconductor laser 93, and a photodetector 94.
The housing 91 includes an upper case 911 and a lower case 912. The upper surface of the lower housing is recessed downwardly to form a lower housing cavity 9121. The gas housing 92 has a laser end 928 and a detector end 929. The gas receiving part 92 includes a splice 921, a reflection tab 922, and a reflection sheet 923. The laser emitted by the tunable semiconductor laser is emitted into the gas accommodating part from the laser end, is transmitted along the central axis of each splicing pipe, is reflected by each reflecting sheet, and is emitted from the detector end to be received by the photoelectric detector.
The circuit board 95 is provided with a laser hole 951 and a detector hole 952, and an electrical pin 950 is arranged on the circuit board and is inserted into the pin hole 9114, and is mainly used for guiding out signals. The laser end and the detector end are positioned at the laser aperture and the detector aperture, respectively.
This embodiment differs from embodiment one in that: the lower casing 912 is provided with a plurality of lower casing holes 9122 which are communicated with the lower casing cavity, and the splicing tube 921 is provided with a plurality of ventilation holes 9211 which are communicated with the lower casing cavity.
In this embodiment, the gas enters the lower housing chamber through the lower housing hole, then enters the splice tube through the vent holes, and then diffuses to the entire gas accommodating portion.
The gas accommodating cavity is provided with a laser end and a detector end, and the tunable semiconductor laser is opposite to the laser end of the gas accommodating part; the photoelectric detector is arranged opposite to the detector end of the gas accommodating part. The gas accommodating part comprises splicing pipes, reflecting joints and reflecting sheets, and each splicing pipe and each reflecting joint are spliced in a mutually spliced manner; the outer side of the joint of the two straight pipes of the reflecting joint is provided with a notch, and the notch and the two straight pipes of the reflecting joint form an included angle of 135 degrees; the reflector plate is arranged at the notch and seals the notch, and the reflector plate and two straight pipes connected with the reflecting joint form an included angle of 135 degrees. Laser emitted by the tunable semiconductor laser is emitted into the gas accommodating part from the laser end, is transmitted along the central axis of each splicing pipe, is reflected by each reflecting sheet, and is emitted from the detector end to be received by the photoelectric detector. Therefore, the gas containing part can be formed by conveniently splicing according to actual needs, and the reflecting sheet can be accurately installed only by being installed at the notch, so that the installation and the use are very convenient.
The foregoing description of the preferred embodiments of the utility model is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the utility model.
Claims (10)
1. Methane sensor based on tunable semiconductor laser absorption spectroscopy technique, including casing, its characterized in that: the methane sensor based on tunable semiconductor laser absorption spectroscopy technique further comprises:
a gas receiving portion having a laser end and a detector end;
a tunable semiconductor laser facing a laser end of the gas accommodating portion;
the photoelectric detector is arranged opposite to the detector end of the gas accommodating part;
the gas housing portion includes:
a splice tube which is a straight tube and includes a plurality of;
the reflection joint comprises a plurality of reflection joints, wherein each reflection joint comprises two straight pipes which are mutually perpendicular and are connected at one end; each splicing pipe and each reflecting joint are spliced in a mutually spliced way; the outer side of the joint of the two straight pipes of the reflecting joint is provided with a notch, and the notch and the two straight pipes of the reflecting joint form an included angle of 135 degrees;
the reflecting sheet is arranged at the notch and seals the notch, and the reflecting sheet and the two straight pipes of the reflecting joint form an included angle of 135 degrees;
the laser emitted by the tunable semiconductor laser is emitted into the gas accommodating part from the laser end, is transmitted along the central axis of each splicing pipe, is reflected by each reflecting sheet, and is emitted from the detector end to be received by the photoelectric detector.
2. The tunable semiconductor laser absorption spectroscopy based methane sensor of claim 1, wherein: the splicing tube is a cylindrical straight tube, and the two straight tubes of the reflecting joint are also cylindrical straight tubes.
3. The tunable semiconductor laser absorption spectroscopy based methane sensor of claim 2, wherein: the reflection joint also comprises plug-in connection parts arranged at two ends, and one end of the plug-in connection pipe is plugged in the plug-in connection parts of the reflection joint.
4. A methane sensor based on tunable semiconductor laser absorption spectroscopy according to claim 3, wherein: the housing includes:
the upper shell is characterized in that the lower surface of the upper shell is upwards recessed to form a first cavity, an air pipe socket which is arranged on the side surface of the upper shell and communicated with the first cavity, and a positioning column which is downwards protruded from the upper surface of the first cavity; the upper surface of the upper shell is provided with a pin hole;
the lower shell is detachably and fixedly connected with the lower end of the upper shell and seals the first cavity;
the methane sensor based on the tunable semiconductor laser absorption spectrum technology further comprises a circuit board, wherein the circuit board is fixed on the lower surface of the positioning column; the circuit board is provided with an electric contact pin which is inserted into the contact pin hole;
the tunable semiconductor laser and the photoelectric detector are arranged in the first cavity and positioned on the circuit board, and the gas accommodating part is clamped and fixed between the lower shell and the circuit board.
5. The tunable semiconductor laser absorption spectroscopy based methane sensor of claim 4, wherein: the lower shell is provided with a lower shell cavity formed by downwards sinking the upper surface of the lower shell, the lower shell is provided with a plurality of lower shell holes communicated with the lower shell cavity, and the splicing pipe is provided with a plurality of ventilation holes communicated with the lower shell cavity.
6. The tunable semiconductor laser absorption spectroscopy based methane sensor of claim 5, wherein: the circuit board is provided with a laser hole and a detector hole, and the laser end and the detector end are respectively positioned at the laser hole and the detector hole.
7. A methane sensor based on tunable semiconductor laser absorption spectroscopy according to claim 3, wherein: the gas housing portion further includes:
the air pipe connectors are respectively arranged at two ends of the gas accommodating part and are provided with a first connector, a second connector communicated with the first connector and a third connector communicated with the first connector and the second connector; the first joint coincides with the central axis of the second joint; the laser end and the detector end are respectively positioned at the end parts of the first joints of the two air pipe joints.
8. The tunable semiconductor laser absorption spectroscopy based methane sensor of claim 7, wherein: the tunable semiconductor laser is in sealing connection with the laser end, and the photoelectric detector is in sealing connection with the detector end.
9. The tunable semiconductor laser absorption spectroscopy based methane sensor of claim 8, wherein: and a sealing ring is arranged between the reflecting sheet and the notch.
10. The tunable semiconductor laser absorption spectroscopy based methane sensor of claim 1, wherein: the notch is a plane notch, and the plane where the notch is located is perpendicular to the plane formed by the central axes of the two straight pipes of the reflecting joint.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321228669.7U CN219694917U (en) | 2023-05-19 | 2023-05-19 | Methane sensor based on tunable semiconductor laser absorption spectrum technology |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321228669.7U CN219694917U (en) | 2023-05-19 | 2023-05-19 | Methane sensor based on tunable semiconductor laser absorption spectrum technology |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219694917U true CN219694917U (en) | 2023-09-15 |
Family
ID=87938159
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202321228669.7U Active CN219694917U (en) | 2023-05-19 | 2023-05-19 | Methane sensor based on tunable semiconductor laser absorption spectrum technology |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN219694917U (en) |
-
2023
- 2023-05-19 CN CN202321228669.7U patent/CN219694917U/en active Active
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