Double-path compensation type pyroelectric infrared detector with independent shipping space structure

Abstract

The utility model discloses a double-path compensation type pyroelectric infrared detector with an independent shipping space structure, which comprises a shell, a plurality of infrared optical filters are arranged on the shell, a tube seat is arranged on the lower side of the shell, the shell is connected with the tube seat, the shell and the tube seat form a closed cavity, an epoxy resin gasket is arranged on the tube seat, and the infrared optical filters are arranged on the epoxy resin gasket. A PCB is arranged on the epoxy resin gasket, a partition cabin is arranged on the PCB, and the partition cabin comprises a detection cabin and a compensation cabin; the detection cabin is divided into three independent detection chambers, and the first compensation cabin and the second compensation cabin are located on the two sides of the detection cabin, so that the sensitive element is isolated from the external environment, and the influence of the external environment temperature and the magnetic field on the sensitive element is avoided; the sensitive elements are separated, so that the influence of heat conduction and electromagnetic interference among the sensitive elements can be avoided, the pyroelectric effect of the sensitive elements is improved, and the detection capability and the detection rate of the detector are greatly improved.

Description

Technical Field

[0001] The utility model relates to a detector, in particular to a dual-path compensation type pyroelectric infrared detector with an independent cabin structure. Background Art

[0002] As pyroelectric infrared detectors are used in different environments, they are affected by the environment, and the temperature and magnetic field are prone to change. Therefore, when using pyroelectric infrared detectors, it is necessary to avoid interference from sudden changes in ambient temperature to the detectors and shield electromagnetic interference. Utility Model Content

[0003] In view of the above problems, the utility model designs a dual-path compensation type pyroelectric infrared detector with an independent cabin structure, comprising a shell, a plurality of infrared filters are arranged on the shell, a tube holder is arranged on the lower side of the shell, the shell is connected to the tube holder, the shell and the tube holder form a closed chamber, an epoxy resin gasket is arranged on the tube holder, a PCB board is arranged on the epoxy resin gasket, a partition cabin is arranged on the PCB board, and the partition cabin includes a detection cabin and a compensation cabin;

[0004] Two partitions are provided inside the detection cabin to divide the detection cabin into three independent detection chambers; the three independent detection chambers are a first detection chamber, a second detection chamber, and a third detection chamber connected to the first detection chamber and the second detection chamber;

[0005] The compensation cabin comprises a first compensation cabin and a second compensation cabin; the first compensation cabin and the second compensation cabin are located on both sides of the detection cabin;

[0006] Sensitive elements are arranged inside the first detection chamber, the second detection chamber, the first compensation chamber and the second compensation chamber.

[0007] Compared with the prior art, the beneficial effects of the utility model are as follows: by dividing the detection cabin into three independent detection chambers, the first compensation chamber and the second compensation chamber are located on both sides of the detection cabin, so that the sensitive elements are isolated from the external environment, which is beneficial to avoiding the influence of the external environment temperature and magnetic field on the sensitive elements; the sensitive elements are separated, which is beneficial to avoiding the influence of heat conduction and electromagnetic interference between the sensitive elements, improving the pyroelectric effect of the sensitive elements, and greatly improving the detection capability and detection rate of the detector.

[0008] Furthermore, a substrate is provided on the lower side of the sensitive element, and the substrate is provided on the upper side of the PCB board;

[0009] The sensitive elements include main sensitive elements, reference sensitive elements, main compensation sensitive elements and reference compensation sensitive elements.

[0010] Furthermore, the main sensitive element is arranged in the first detection chamber, the reference sensitive element is arranged in the second detection chamber, the main compensation sensitive element is arranged in the first compensation chamber, and the reference compensation sensitive element is arranged in the second compensation chamber.

[0011] The beneficial effects of adopting the above-mentioned further technical scheme are: by placing each sensitive element inside an independent dark cabin, they do not interfere with each other and work independently, which effectively reduces the output noise of the detector and improves the signal-to-noise ratio of the detector. By setting the compensating sensitive element, the calibration ability of the reference sensitive element for the main sensitive element is improved. The reference sensitive element is contrasted with the main sensitive element, which effectively reduces the measurement error of the main sensitive element and ensures that the measurement result of the detector is accurate and reliable.

[0012] Furthermore, the partition cabin includes a heat insulation layer, and the heat insulation layer is a nano-conductive material.

[0013] Furthermore, a magnetic shielding layer is provided on the side of the thermal insulation layer; a magnetic shielding layer is provided on a side of the partition inside the detection cabin away from the sensitive element;

[0014] The magnetic shield layer is a metal coating with a smooth surface and high reflectivity.

[0015] Furthermore, a diffuse reflection layer is provided in the first detection chamber, the second detection chamber, the first compensation chamber and the second compensation chamber. The diffuse reflection layer is a multi-molecular polymer or aluminum nitride ceramic, and the surface of the diffuse reflection layer is rough.

[0016] The beneficial effects of adopting the above-mentioned further technical scheme are as follows: by using the heat insulation layer as nano-conductive material, the thermal melting rate of the partition cabin is low and the heat insulation effect is good, which effectively reduces the influence of the ambient temperature on the detector and effectively reduces the heat conduction between the sensitive elements; by arranging a magnetic shield layer on the outside of the heat insulation layer, the magnetic shield layer is a smooth metal coating, so that the outer surface of the partition cabin is a closed magnetic flux to shield electromagnetic interference, and by arranging a magnetic shield layer on the side of the partition away from the sensitive element, the main sensitive element and the reference sensitive element are electromagnetically shielded, effectively avoiding the electromagnetic mutual winding between the main sensitive element and the reference sensitive element, and effectively reducing the measurement error of the main sensitive element; by arranging a diffuse reflection layer in the detection room and the compensation chamber, the inner surface of the detection room and the compensation chamber is slowly reflected, and the heat energy is concentrated and protected in an independent space, effectively avoiding sudden changes in external environmental temperature and electromagnetic interference on the sensitive element, and at the same time effectively avoiding heat conduction and electromagnetic interference between the sensitive elements, thereby improving the detector's response and receiving capabilities.

[0017] Furthermore, a detection pin is provided on the lower side of the tube holder, and the detection pin includes a measurement signal output pin, a power supply pin, a reference signal output pin and a ground pin. The detection pin passes through the tube holder, the epoxy resin gasket and is connected to the PCB board; the end of the detection pin in contact with the PCB board is distributed in a circular shape on the surface of the PCB board, and the end of the detection pin in contact with the PCB board is distributed between the gap formed by the compensation cabin and the first detection chamber and the second detection chamber.

[0018] Furthermore, the inner wall length of the detection chamber is 6.06-7.05 mm, and the inner wall width of the detection chamber is 2.0-2.3 mm; the inner wall length of the third detection chamber is 2.0-2.3 mm.

[0019] Furthermore, the inner wall lengths of the first compensation bin and the second compensation bin are 2.0-2.3 mm, and the inner wall widths of the first compensation bin and the second compensation bin are 2.0-2.3 mm.

[0020] Furthermore, the four sensitive elements have the same height;

[0021] The first compensation chamber and the second compensation chamber are located on both sides of the third detection chamber; the detection chamber and the first compensation chamber and the second compensation chamber are distributed in a cross shape.

[0022] The beneficial effects of adopting the above-mentioned further technical scheme are: through the reasonable layout of the detection pins, the detection cabin and the compensation cabin, the detector receives and transmits uniform and stable signals; through the same height of the sensitive elements, the degree to which the sensitive elements receive signals is consistent, effectively avoiding the occurrence of errors and effectively avoiding the inability of the reference sensitive element to effectively calibrate the main sensitive element due to inconsistent heights; through the cross distribution of the detection cabin and the first compensation cabin and the second compensation cabin, the sensitive elements are evenly distributed, thereby maximizing the measurement accuracy of the sensitive elements. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is an internal cross-sectional view of a dual-path compensation pyroelectric infrared detector with an independent cabin structure;

[0024] Figure 2 It is an internal top view of a dual-path compensation pyroelectric infrared detector with an independent cabin structure;

[0025] Figure 3 This is a schematic diagram of the structure of the partition cabin;

[0026] Among them: 1. Shell; 2. Infrared filter; 3. Tube socket; 4. Epoxy resin gasket; 5. PCB board; 6. First detection chamber; 7. Second detection chamber; 8. Third detection chamber; 9. First compensation chamber; 10. Second compensation chamber; 11. Substrate; 12. Main sensitive element; 13. Reference sensitive element; 14. Main compensation sensitive element; 15. Reference compensation sensitive element; 16. Thermal insulation layer; 17. Magnetic shield layer; 18. Diffuse reflection layer; 19. Measurement signal output pin; 20. Power supply pin; 21. Reference signal output pin; 22. Ground pin. DETAILED DESCRIPTION

[0027] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention.

[0028] Embodiment 1:

[0029] The present embodiment provides a dual-path compensation type pyroelectric infrared detector with an independent cabin structure, comprising a shell 1, on which a plurality of infrared filters 2 are arranged, a tube seat 3 is arranged on the lower side of the shell 1, the shell 1 is connected to the tube seat 3, the shell 1 and the tube seat 3 form a closed chamber, an epoxy resin gasket 4 is arranged on the tube seat 3, a PCB board 5 is arranged on the epoxy resin gasket 4, a partition cabin is arranged on the PCB board 5, and the partition cabin comprises a detection cabin and a compensation cabin; two partitions are arranged inside the detection cabin, dividing the detection cabin into three independent detection chambers; the three independent detection chambers are a first detection chamber 6, a second detection chamber 7, and a third detection chamber 8 connecting the first detection chamber 6 and the second detection chamber 7; the compensation cabin comprises a first compensation chamber 9 and a second compensation chamber 10; the first compensation chamber 9 and the second compensation chamber 10 are located on both sides of the detection cabin; sensitive elements are arranged inside the first detection chamber 6, the second detection chamber 7, the first compensation chamber 9, and the second compensation chamber 10. The detection cabin is divided into three independent detection chambers, and the first compensation chamber 9 and the second compensation chamber 10 are located on both sides of the detection cabin, so that the sensitive elements are isolated from the external environment, which is beneficial to avoiding the influence of the external environment temperature and magnetic field on the sensitive elements; the sensitive elements are separated from each other, which is beneficial to avoiding the influence of heat conduction and electromagnetic interference between the sensitive elements, improving the pyroelectric effect of the sensitive elements, and greatly improving the detection capability and detection rate of the detector.

[0030] A substrate 11 is provided at the lower side of the sensitive element, and the substrate 11 is provided at the upper side of the PCB board 5; the sensitive element includes a main sensitive element 12, a reference sensitive element 13, a main compensation sensitive element 14 and a reference compensation sensitive element 15. The main sensitive element 12 is provided in the first detection chamber 6, the reference sensitive element 13 is provided in the second detection chamber 7, the main compensation sensitive element 14 is provided in the first compensation chamber 9, and the reference compensation sensitive element 15 is provided in the second compensation chamber 10. By placing each sensitive element in an independent dark chamber, the detector output noise is effectively reduced and the signal-to-noise ratio of the detector is improved. By providing the compensation sensitive element, the calibration capability of the reference sensitive element 13 to the main sensitive element 12 is improved. The reference sensitive element 13 is contrasted with the main sensitive element 12, and the measurement error of the main sensitive element 12 is effectively reduced, ensuring that the measurement result of the detector is accurate and reliable.

[0031] The partition cabin includes a heat insulation layer 16, which is a nano-conductive material. A magnetic shield layer 17 is arranged on the side of the heat insulation layer 16; a magnetic shield layer 17 is arranged on the side of the partition inside the detection cabin away from the sensitive element; the magnetic shield layer 17 is a metal coating, and the metal coating has a smooth surface and high reflectivity. A diffuse reflection layer 18 is arranged in the first detection chamber 6, the second detection chamber 7, the first compensation chamber 9 and the second compensation chamber 10. The diffuse reflection layer 18 is a multi-molecule polymer or aluminum nitride ceramic, and the surface of the diffuse reflection layer is rough. The heat-insulating layer 16 is made of nano-conductive material, so that the thermal melting rate of the partition cabin is low and the heat-insulating effect is good, which effectively reduces the influence of the ambient temperature on the detector and effectively reduces the heat conduction between the sensitive elements; a magnetic shielding layer 17 is arranged on the outside of the heat-insulating layer 16, and the magnetic shielding layer 17 is a smooth metal coating, so that the outer surface of the partition cabin is a closed magnetic flux to shield electromagnetic interference, and a magnetic shielding layer 17 is arranged on the side of the partition away from the sensitive element, so that the main sensitive element 12 and the reference sensitive element 13 are electromagnetically shielded, effectively avoiding the electromagnetic mutual winding between the main sensitive element 12 and the reference sensitive element 13, and effectively reducing the measurement error of the main sensitive element 12; a diffuse reflection layer 18 is arranged in the detection room and the compensation chamber, so that the inner surface of the detection room and the compensation chamber is slowly reflected, and the heat energy is concentrated and protected in an independent space, effectively avoiding the sudden change of the external environment temperature and the interference of the electromagnetic on the sensitive element, and effectively avoiding the heat conduction and electromagnetic interference between the sensitive elements, thereby improving the reaction and receiving capabilities of the detector.

[0032] The lower side of the tube seat 3 is provided with detection pins, which include a measurement signal output pin 19, a power supply pin 20, a reference signal output pin 21 and a ground pin 22. The detection pins penetrate the tube seat 3, the epoxy resin gasket 4 and are connected to the PCB board 5; the end of the detection pin in contact with the PCB board 5 is distributed in a circular shape on the surface of the PCB board 5, and the end of the detection pin in contact with the PCB board 5 is distributed between the gap formed by the compensation cabin and the first detection chamber 6 and the second detection chamber 7; the inner wall length of the detection cabin is 6.5mm, and the inner wall width of the detection cabin is 2.15mm; the inner wall length of the third detection chamber 8 is 2.15mm. The inner wall length of the first compensation chamber and the second compensation chamber is 2.15mm, and the inner wall width of the first compensation chamber and the second compensation chamber is 2.15mm. The heights of the four sensitive elements are the same; the first compensation chamber 9 and the second compensation chamber 10 are located on both sides of the third detection chamber 8; the detection chamber and the first compensation chamber 9 and the second compensation chamber 10 are distributed in a cross shape. Through the reasonable layout of the detection pins, the detection cabin and the compensation cabin, the detector receives and transmits uniform and stable signals; through the same height of the sensitive elements, the degree to which the sensitive elements receive signals is consistent, effectively avoiding the occurrence of errors and effectively avoiding the inability of the reference sensitive element 13 to effectively calibrate the main sensitive element 12 due to inconsistent heights; through the cross distribution of the detection cabin and the first compensation cabin 9 and the second compensation cabin 10, the sensitive elements are evenly distributed, thereby maximizing the measurement accuracy of the sensitive elements.

[0033] Embodiment 2:

[0034] The same contents as those in the first embodiment are not described in detail here. The differences between the first embodiment and the present embodiment are as follows:

[0035] This embodiment provides a dual-path compensation pyroelectric infrared detector with an independent cabin structure, wherein the inner wall length of the detection cabin is 7.04 mm, the inner wall width of the detection cabin is 2.2 mm; the inner wall length of the third detection chamber 8 is 2.2 mm.

[0036] The inner wall lengths of the first compensation bin and the second compensation bin are 2.2 mm, and the inner wall widths of the first compensation bin and the second compensation bin are 2.2 mm.

[0037] Embodiment three:

[0038] The same contents of this embodiment as those of the second embodiment are not repeated here; the differences between this embodiment and the second embodiment are as follows:

[0039] This embodiment provides a dual-path compensation pyroelectric infrared detector with an independent cabin structure, wherein the inner wall length of the detection cabin is 6.07 mm, the inner wall width of the detection cabin is 2.1 mm; the inner wall length of the third detection chamber 8 is 2.1 mm.

[0040] The inner wall lengths of the first compensation bin and the second compensation bin are 2.1 mm, and the inner wall widths of the first compensation bin and the second compensation bin are 2.1 mm.

[0041] The above embodiments are only used to illustrate the technical solutions of the utility model, rather than to limit them; based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model. Although the utility model is described in detail with reference to the above embodiments, ordinary technicians in this field should understand that they can still modify the technical solutions recorded in the above embodiments, or replace some of the technical features therein by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the utility model.

Claims

1. A dual-path compensation type pyroelectric infrared detector with an independent cabin structure, comprising a housing (1), characterized in that: The housing (1) is provided with a plurality of infrared filters (2); a tube seat (3) is provided on the lower side of the housing (1); the housing (1) is connected to the tube seat (3); the housing (1) and the tube seat (3) form a closed chamber; an epoxy resin gasket (4) is provided on the tube seat (3); a PCB board (5) is provided on the epoxy resin gasket (4); a partition cabin is provided on the PCB board (5); the partition cabin comprises a detection cabin and a compensation cabin; Two partitions are provided inside the detection cabin, dividing the detection cabin into three independent detection chambers; the three independent detection chambers are a first detection chamber (6), a second detection chamber (7), and a third detection chamber (8) connected to the first detection chamber (6) and the second detection chamber (7); The compensation cabin comprises a first compensation cabin (9) and a second compensation cabin (10); the first compensation cabin (9) and the second compensation cabin (10) are located on both sides of the detection cabin; Sensitive elements are arranged inside the first detection chamber (6), the second detection chamber (7), the first compensation chamber (9) and the second compensation chamber (10).

2. The independent cabin structure dual-path compensation type pyroelectric infrared detector according to claim 1, characterized in that: A substrate (11) is arranged on the lower side of the sensitive element, and the substrate (11) is arranged on the upper side of the PCB board (5); The sensitive elements include a main sensitive element (12), a reference sensitive element (13), a main compensation sensitive element (14) and a reference compensation sensitive element (15).

3. The independent cabin structure dual-path compensation type pyroelectric infrared detector according to claim 2, characterized in that: The main sensitive element (12) is arranged in the first detection chamber (6), the main reference sensitive element (13) is arranged in the second detection chamber (7), the main compensation sensitive element (14) is arranged in the first compensation chamber (9), and the reference compensation sensitive element (15) is arranged in the second compensation chamber (10).

4. The independent cabin structure dual-path compensation type pyroelectric infrared detector according to claim 3, characterized in that: The partition cabin comprises a heat insulation layer (16), and the heat insulation layer (16) is a nano-conductive material.

5. The independent cabin structure dual-path compensation type pyroelectric infrared detector according to claim 4, characterized in that: A magnetic shielding layer (17) is arranged outside the heat insulation layer (16); a magnetic shielding layer (17) is arranged on a side of the partition inside the detection cabin away from the sensitive element; The magnetic shield layer (17) is a metal coating.

6. The independent cabin structure dual-path compensation type pyroelectric infrared detector according to claim 5, characterized in that: A diffuse reflection layer (18) is arranged in the first detection chamber (6), the second detection chamber (7), the first compensation chamber (9) and the second compensation chamber (10), and the diffuse reflection layer (18) is a multi-molecule polymer or aluminum nitride ceramic.

7. The independent cabin structure dual-path compensation type pyroelectric infrared detector according to claim 6, characterized in that: The lower side of the tube holder (3) is provided with detection pins, the detection pins comprising a measurement signal output pin (19), a power supply pin (20), a reference signal output pin (21) and a ground pin (22), and the detection pins penetrate the tube holder (3), the epoxy resin gasket (4) and are connected to the PCB board (5).

8. The independent cabin structure dual-path compensation type pyroelectric infrared detector according to claim 7, characterized in that: The inner wall length of the detection chamber is 6.06-7.05 mm, and the inner wall width of the detection chamber is 2.0-2.3 mm; the inner wall length of the third detection chamber (8) is 2.0-2.3 mm.

9. The independent cabin structure dual-path compensation type pyroelectric infrared detector according to claim 8, characterized in that: The inner wall lengths of the first compensation bin and the second compensation bin are 2.0-2.3 mm, and the inner wall widths of the first compensation bin and the second compensation bin are 2.0-2.3 mm.

10. The independent cabin structure dual-path compensation type pyroelectric infrared detector according to claim 9, characterized in that: The four sensitive elements have the same height; The first compensation chamber (9) and the second compensation chamber (10) are located on both sides of the third detection chamber (8); the detection chamber and the first compensation chamber and the second compensation chamber (10) are arranged in a cross shape.

Images