CN210665490U - Correlation type infrared gas sensor - Google Patents
Correlation type infrared gas sensor Download PDFInfo
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- CN210665490U CN210665490U CN201921188026.8U CN201921188026U CN210665490U CN 210665490 U CN210665490 U CN 210665490U CN 201921188026 U CN201921188026 U CN 201921188026U CN 210665490 U CN210665490 U CN 210665490U
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Abstract
The utility model provides an infrared gas sensor of correlation formula, it includes: the optical cavity is provided with an air inlet hole on the side wall; the infrared light source is arranged at one end of the optical cavity and used for emitting infrared rays; the light-gathering cup is internally provided with the infrared light source to reflect the infrared light; and the infrared detectors are symmetrically arranged at the other end of the optical cavity and used for receiving the infrared light reflected by the light-gathering cup. The utility model discloses avoid the waste of infrared light, effectively solved the not enough technical problem of light energy of detector receipt.
Description
Technical Field
The utility model relates to an infrared gas sensor technical field, specific theory has related to an infrared gas sensor of correlation formula.
Background
The infrared gas sensor is a gas sensing device which selects absorption characteristics based on near infrared spectra of different gas molecules, identifies gas components by utilizing the relation between gas concentration and absorption intensity and determines the concentration of the gas components. Among them, the NDIR method is the mainstream technology in infrared gas detection, and the NDIR, i.e. non-dispersive infrared method is also called non-dispersive infrared absorption analysis technology. The infrared gas sensor designed based on the NDIR has a series of advantages of wide application, long service life, high sensitivity, good stability, more suitable gases, high cost performance, low maintenance cost, online analysis and the like. The design of the optical cavity of the infrared gas sensor plays a crucial role in the accuracy, stability, sensitivity and other factors of the infrared gas sensor.
At present, in order to meet the requirement of small volume of a client, the overall size of a common civil infrared gas sensor in the market is reduced repeatedly, so that the volume of an optical cavity is correspondingly reduced, and a light path is shortened; and after the infrared light is refracted by the optical channel, partial light is received by the detector, so that the waste of a large amount of infrared light is caused, the light energy received by the detector is insufficient, the detection precision of the infrared gas sensor is influenced, and partial market demands cannot be met.
In order to solve the above problems, people are always seeking an ideal technical solution.
Disclosure of Invention
The utility model aims at providing a to the not enough of prior art to provide an infrared gas sensor of correlation formula.
In order to realize the purpose, the utility model discloses the technical scheme who adopts is: a correlation infrared gas sensor comprising:
the optical cavity is provided with an air inlet hole on the side wall;
the infrared light source is arranged at one end of the optical cavity and used for emitting infrared rays;
the light-gathering cup is internally provided with the infrared light source to reflect the infrared light;
and the infrared detectors are symmetrically arranged at the other end of the optical cavity and used for receiving the infrared light reflected by the light-gathering cup.
Based on the above, the infrared light source and the infrared detector are arranged in a center corresponding manner.
Based on the above, the reflecting surface of the light-gathering cup is a paraboloid of revolution, and the infrared light source is arranged at the focus of the paraboloid of revolution.
Based on the above, the infrared light source is connected with the signal acquisition circuit board through a power line, and the power line is made of a flexible PCB.
Based on the above, the light-gathering cup is fixedly arranged in the optical cavity through AB glue.
Based on the above, the waterproof breathable film is pasted on the outer wall of the optical cavity.
The utility model discloses relative prior art has substantive characteristics and progress, specific theory:
1) the utility model provides a correlation type infrared gas sensor, the infrared light source is arranged at two ends of the optical cavity with the infrared detector, and the infrared light source is arranged corresponding to the center of the infrared detector to form a light path of a correlation structure, so that infrared light emitted by the infrared light source passes through the optical cavity in a straight line after being reflected by the light gathering cup and reaches the infrared detector; therefore, the waste of infrared light is avoided, the technical problem that the light energy received by the detector is insufficient is effectively solved, and the detection precision of the infrared gas sensor is improved;
2) the infrared light source is connected with the signal acquisition circuit board through a power line, and the power line is made of a flexible PCB; the weight of the infrared gas sensor is reduced, the material is saved, and the cost is reduced;
3) the light-gathering cup and the optical cavity are fixed through AB glue, and the signal acquisition circuit board, the signal processing circuit board and the sensor protection shell are fixed through silica gel, so that the stability and the use safety of a product are effectively improved, and the anti-interference capability is enhanced;
4) paste on the optical cavity outer wall and have waterproof ventilated membrane, make the utility model discloses possess waterproof ventilative function, prolonged the life of product.
Drawings
Fig. 1 is a schematic structural diagram of the present invention.
Fig. 2 is a schematic structural diagram of the optical cavity of the present invention.
Fig. 3 is a schematic structural diagram of the sensor protection casing of the present invention.
In the figure: 1. a sensor protection housing; 2. an optical cavity; 3. a light focusing cup; 4. an infrared light source; 5. an infrared detector; 6. a signal acquisition circuit board; 7. a signal processing circuit board; 8. a waterproof breathable film; 9. an optical channel; 11. a through hole; 21. and (4) air inlet holes.
Detailed Description
The technical solution of the present invention will be described in further detail through the following embodiments.
Example 1
As shown in fig. 1 and 2, a correlation type infrared gas sensor includes: the optical cavity 2 is provided with an air inlet 21 on the side wall of the optical cavity 2; the infrared light source 4 is arranged at one end of the optical cavity 2 and used for emitting infrared rays; the light-gathering cup 3 is internally provided with the infrared light source 4 to reflect the infrared light; and the infrared detectors 5 are symmetrically arranged at the other end of the optical cavity 2 and receive the infrared light reflected by the light-gathering cup 3.
In this embodiment, a specific implementation of the light-gathering cup is given, the reflecting surface of the light-gathering cup 3 is a paraboloid of revolution, and the infrared light source is arranged at the focus of the paraboloid of revolution; an optical channel 9 is arranged in the optical cavity 2, the edge shape of the light-gathering cup is matched with the optical cavity, and the shape of the infrared detector is matched with the optical cavity; therefore, infrared light emitted by the infrared light source can pass through the optical channel 9 in a straight line after being reflected by the light-gathering cup, and is received by the infrared detector, so that waste of the infrared light is avoided.
Specifically, the depth of the rotational paraboloid is 1 mm to 5 mm, and the caliber of the rotational paraboloid is 5 mm to 10 mm; preferably, the depth of the paraboloid of revolution is 3.85 mm, and the caliber of the paraboloid of revolution is 8.77 mm.
In this embodiment, the light-gathering cup 3, the optical cavity 2, the infrared light source 4 and the infrared detector 5 are disposed in the sensor protection housing 1; the sensor protection shell 1 is provided with a plurality of through holes 11, and the through holes 11 are arranged corresponding to the air inlet holes 21. The through hole 11 is a long strip-shaped hole, and the air inlet 21 is a circular hole. In other embodiments, the through hole 11 may also be a circular hole or another through hole, and the air inlet 21 may also be an elongated hole or another hole.
To sum up, the utility model provides a correlation type infrared gas sensor, the infrared light source 4 and the infrared detector 5 are arranged at two ends of the optical cavity 2, and the infrared light source and the infrared detector center are arranged correspondingly to form a light path of a correlation structure, so that infrared light emitted by the infrared light source passes through the optical cavity in a straight line after being reflected by the lampshade reflector, and is received by the infrared detector; the utility model discloses avoid the waste of infrared light, effectively solved the not enough technical problem of detector received light energy to infrared gas sensor's detection precision has been improved.
Example 2
This example differs from example 1 in that: the other end of the optical cavity 2 is also provided with a signal acquisition circuit board 6 and a signal processing circuit board 7; the input end of the signal acquisition circuit board 6 is connected with the infrared detector 5, and the output end of the signal acquisition circuit board 6 is connected with the signal processing circuit board 7 through a contact pin. The infrared detector 5 is arranged on the signal acquisition circuit board 6, and the signal processing circuit board 7 is provided with an output terminal so as to be electrically connected with the outside.
In this implementation, the infrared light source 4 is connected to the signal acquisition circuit board 6 through a power line, and the power line is made of a flexible PCB; the weight of the infrared gas sensor is reduced, the material is saved, and the cost is reduced.
In the implementation, the light-gathering cup 3 and the optical cavity 2 are fixed through AB glue, and the signal acquisition circuit board 6, the signal processing circuit board 7 and the sensor protection shell 1 are fixed through silica gel, so that the stability and the use safety of a product are effectively improved, and the anti-interference capability is enhanced; effectively improves the stability and the use safety of the product and enhances the anti-interference capability.
Example 3
The present embodiment is different from the other embodiments in that: paste on 2 outer walls of optical cavity and have waterproof ventilated membrane 8, make the utility model discloses possess waterproof ventilative function, prolonged the life of product.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention and not to limit it; although the present invention has been described in detail with reference to preferred embodiments, it should be understood by those skilled in the art that: the invention can be modified or equivalent substituted for some technical features; without departing from the spirit of the present invention, it should be understood that the scope of the claims is intended to cover all such modifications and variations.
Claims (10)
1. A correlation infrared gas sensor, comprising:
the optical cavity is provided with an air inlet hole on the side wall;
the infrared light source is arranged at one end of the optical cavity and used for emitting infrared rays;
the light-gathering cup is internally provided with the infrared light source to reflect the infrared light;
and the infrared detectors are symmetrically arranged at the other end of the optical cavity and used for receiving the infrared light reflected by the light-gathering cup.
2. The correlation infrared gas sensor according to claim 1, characterized in that: the infrared light source is arranged corresponding to the center of the infrared detector.
3. The correlation infrared gas sensor according to claim 1, characterized in that: the reflecting surface of the light-gathering cup is a paraboloid of revolution, and the infrared light source is arranged on the focus of the paraboloid of revolution.
4. The correlation infrared gas sensor according to claim 3, characterized in that: the depth of the rotating paraboloid is 1 mm-5 mm, and the caliber of the rotating paraboloid is 5 mm-10 mm.
5. The correlation infrared gas sensor according to claim 4, characterized in that: the depth of the revolution paraboloid is 3.85 mm, and the caliber of the revolution paraboloid is 8.77 mm.
6. The correlation infrared gas sensor according to claim 1, characterized in that: the other end of the optical cavity is also provided with a signal acquisition circuit board and a signal processing circuit board; the input end of the signal acquisition circuit board is connected with the infrared detector, and the output end of the signal acquisition circuit board is connected with the signal processing circuit board.
7. The correlation infrared gas sensor according to claim 6, characterized in that: the infrared light source is connected with the signal acquisition circuit board through a power line, and the power line is made of a flexible PCB.
8. The correlation infrared gas sensor according to claim 1, characterized in that: the light-gathering cup is fixedly arranged in the optical cavity through AB glue.
9. The correlation infrared gas sensor according to claim 1, characterized in that: and a waterproof breathable film is stuck on the outer wall of the optical cavity.
10. The correlation infrared gas sensor according to any one of claims 1 to 9, wherein: the light-gathering cup, the optical cavity, the infrared light source and the infrared detector are arranged in the sensor protective shell.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921188026.8U CN210665490U (en) | 2019-07-26 | 2019-07-26 | Correlation type infrared gas sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921188026.8U CN210665490U (en) | 2019-07-26 | 2019-07-26 | Correlation type infrared gas sensor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210665490U true CN210665490U (en) | 2020-06-02 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921188026.8U Active CN210665490U (en) | 2019-07-26 | 2019-07-26 | Correlation type infrared gas sensor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN210665490U (en) |
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2019
- 2019-07-26 CN CN201921188026.8U patent/CN210665490U/en active Active
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