A high-speed, fast-response multi-element pyroelectric infrared detector

Abstract

The utility model discloses a high-speed, fast-response multi-element pyroelectric infrared detector, comprising a shell, a plurality of infrared filters are arranged on the shell, a tube seat is arranged on the lower side of the shell, the shell is connected to the tube seat, the shell and the tube seat form a closed chamber, a detector gasket is arranged on the tube seat, a PCB board is arranged on the detector gasket, a plurality of supporting structures are arranged on the PCB board, a receiving cavity is opened above the supporting structure, a gel substrate is arranged in the receiving cavity, a measuring sensitive element is arranged above the supporting structure, the measuring sensitive element and the infrared filter are arranged oppositely, and a heat diffusion shielding area is arranged between the plurality of measuring sensitive elements. By arranging the gel substrate in the receiving cavity of the supporting structure, it is beneficial to reduce the heat loss of the measuring sensitive element, and it is beneficial to reduce the influence of the external environment temperature on the measuring sensitive element, thereby improving the performance of the detector; by arranging the heat diffusion shielding area, each measuring sensitive element can work independently without interfering with each other.

Description

Technical Field

[0001] The utility model relates to a detector, in particular to a high-speed, fast-response multi-element pyroelectric infrared detector. Background Art

[0002] Traditional pyroelectric infrared detectors mostly use metal or semiconductor substrates, which have a fast thermal response speed. However, due to the large thermal conductivity of metal or semiconductor materials, the thermal response time of the detector is long. The metal substrate will also interfere with the signal output of the detector, and cannot meet the requirements of high-speed rapid response. In addition, the external ambient temperature will also affect the detection performance of the detector. Utility Model Content

[0003] In view of the above problems, the utility model designs a high-speed, fast-response multi-element pyroelectric infrared detector, comprising a shell, characterized in that: 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, a detector gasket is arranged on the tube holder, a PCB board is arranged on the detector gasket, a plurality of supporting structures are arranged on the PCB board, a accommodating cavity is opened above the supporting structure, a gel substrate is arranged in the accommodating cavity, a measuring sensitive element is arranged above the supporting structure, the measuring sensitive element is arranged opposite to the infrared filter, and a heat diffusion shielding area is arranged between the plurality of measuring sensitive elements.

[0004] Compared with the prior art, the beneficial effects of the utility model are as follows: by arranging a gel substrate in the accommodating cavity of the support structure, the detector is insulated by utilizing its lower thermal conductivity, which is beneficial to reducing the heat loss of the measuring sensitive element, and reducing the influence of the external ambient temperature on the measuring sensitive element, effectively reducing the thermal response time of the detector, suppressing the interference of the metal electrode on the detector signal output, and improving the performance of the detector; by arranging a plurality of measuring sensitive elements above the support structure, all-round detection of infrared radiation of different directions and wavelengths can be achieved, and the sensitivity and response time of the detector can be improved; by arranging a heat diffusion shielding area between a plurality of measuring sensitive elements, each measuring sensitive element can work independently without interfering with each other, ensuring that the receiving capacity of each measuring sensitive element reaches the optimal level, suppressing high signals so that the energy is evenly distributed to each measuring sensitive element, and being able to effectively detect infrared radiation signals and convert them into electrical signal outputs.

[0005] Furthermore, the measuring sensitive elements are: a main sensitive element, a first sensitive element and a second sensitive element; the first sensitive element and the second sensitive element are arranged on both sides of the main sensitive element, and the area of ​​the main sensitive element is larger than that of the first sensitive element and the second sensitive element.

[0006] The beneficial effect of adopting the above further technical solution is: by setting the main sensitive element, the first sensitive element and the second sensitive element, the area of ​​the main sensitive element is larger than that of the first sensitive element and the second sensitive element, so that the measurement of the detector is more accurate.

[0007] Furthermore, a first shielding area and a second shielding area are provided between the main sensitive element and the first sensitive element and the second sensitive element; and a third shielding area is provided between the first sensitive element and the second sensitive element.

[0008] The beneficial effect of adopting the above further technical solution is: by setting the first shielding area, the second shielding area and the third shielding area, each sensitive element can work independently without interfering with each other, so that the energy is evenly distributed and the measurement of the detector is more accurate.

[0009] Furthermore, the main sensitive element is triangular or fan-shaped;

[0010] One side of the main sensitive element is parallel to one side of the first sensitive element and has the same length;

[0011] The other side of the main sensitive element is parallel to one side of the second sensitive element and has the same length.

[0012] Furthermore, the main sensitive element is an isosceles triangle, and the first sensitive element and the second sensitive element are right-angled trapezoids.

[0013] The beneficial effect of adopting the above-mentioned further technical solution is: by setting the edge of the main sensitive element parallel to the first sensitive element and the second sensitive element, the energy between the main sensitive element and the first sensitive element and the second sensitive element is evenly distributed, so that when infrared radiation of different directions and wavelengths shines into the sensitive element, all-round detection can be performed through different sensitive elements, thereby improving the sensitivity and response time of the detector.

[0014] Furthermore, the main sensitive element, the first sensitive element, the second sensitive element, the first shielding area, the second shielding area and the third shielding area form a square, which is located above the center of the PCB board.

[0015] The beneficial effect of adopting the above further technical solution is: by forming a square with the main sensitive element, the first sensitive element, the second sensitive element, the first shielding area, the second shielding area and the third shielding area, the receiving area of ​​each sensitive element is optimized.

[0016] Further, the first shielding area, the second shielding area and the third shielding area form a Y shape;

[0017] The first sensitive element and the second sensitive element are located on both sides of the third shielding area; the right-angled short sides of the first sensitive element and the second sensitive element are parallel, and the length of the right-angled short sides of the first sensitive element and the second sensitive element is equal to the length of the third shielding area.

[0018] Furthermore, the length of the first shielding area is equal to the length of the second shielding area; the length of the first shielding area and the length of the second shielding area are both greater than the length of the third shielding area.

[0019] The beneficial effect of adopting the above-mentioned further technical solution is: the first shielding area, the second shielding area and the third shielding area form a Y shape, so that the shielding effect between the sensitive elements is good, and the received energy between the sensitive elements is evenly distributed, so that the sensitive elements react faster and meet the functional requirements of fast and high response.

[0020] Furthermore, the state of the gel substrate changes with temperature. When the temperature decreases, the gel substrate changes from a sol-mixed state to a gel state. When the temperature increases, the gel substrate changes from a gel-mixed state to a sol-mixed state. The temperature of the gel substrate when it is in a gel-sol mixed state is 40-70°C. The gel substrate is a temperature-sensitive gel. The system volume or phase state (gel state or sol state) of the temperature-sensitive gel changes with temperature. The temperature-sensitive hydrogel includes poly (N-isopropylacrylamide) or polyacrylamide and a copolymer of polyethylene glycol.

[0021] The beneficial effects of adopting the above-mentioned further technical scheme are as follows: when the ambient temperature becomes cold, the gel substrate solidifies and releases a certain amount of heat, and at the same time plays a role of heat insulation and heat preservation for the sensitive element, which is beneficial to reducing the impact of the ambient temperature; when the ambient temperature rises, the gel substrate solubilizes and absorbs the heat of the surrounding environment, reducing the thermal conductivity of the gel substrate, improving the heat insulation effect, and helping to reduce the impact of the ambient temperature.

[0022] Furthermore, a detection pin is provided on the lower side of the tube holder, and the detection pin includes a first signal output pin, a second signal output pin, a third signal output pin, a positive power supply pin, a negative power supply pin and a ground pin; the detection pin passes through the tube holder, the detector gasket and is connected to the PCB board;

[0023] Preferably, the first signal output pin, the second signal output pin, the third signal output pin, the positive power supply pin, the negative power supply pin and the ground pin are distributed in a circular shape around a square formed by the main sensitive element, the first sensitive element, the second sensitive element, the first shielding area, the second shielding area and the third shielding area;

[0024] More preferably, the center distance between the second signal output pin and the main sensitive element is 0.08mm-0.1mm, the first signal output pin, the second signal output pin, and the third signal output pin form an equilateral triangle, and the positive power pin, the negative power pin and the ground pin are evenly distributed between the first signal output pin, the second signal output pin and the third signal output pin.

[0025] The beneficial effect of adopting the above further technical solution is that the output effect of the signal can be improved through the reasonable distribution of the detector pins. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is an internal cross-sectional view of a high-speed, fast-response multi-element pyroelectric infrared detector;

[0027] Figure 2 It is a top view of the interior of a high-speed, fast-response multi-element pyroelectric infrared detector;

[0028] Among them: 1. Shell; 2. Infrared filter; 3. Tube socket; 4. Detector gasket; 5. PCB board; 6. Support structure; 7. Accommodation cavity; 8. Gel substrate; 9. Measurement sensitive element; 10. Main sensitive element; 11. First sensitive element; 12. Second sensitive element; 13. First shielding area; 14. Second shielding area; 15. Third shielding area; 16. First signal output pin; 17. Second signal output pin; 18. Third signal output pin; 19. Positive power pin; 20. Negative power pin; 21. Ground pin. DETAILED DESCRIPTION

[0029] 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.

[0030] Embodiment 1:

[0031] The present embodiment provides a high-speed, fast-response multi-element pyroelectric infrared detector, comprising a shell 1, characterized in that: a plurality of infrared filters 2 are arranged on the shell 1, 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, a detector gasket 4 is arranged on the tube seat 3, a PCB board 5 is arranged on the detector gasket 4, a plurality of supporting structures 6 are arranged on the PCB board 5, a receiving cavity 7 is opened above the supporting structure 6, a gel substrate 8 is arranged in the receiving cavity 7, a measuring sensitive element 9 is arranged above the supporting structure 6, the measuring sensitive element 9 is arranged opposite to the infrared filter 2, and a heat diffusion shielding area is arranged between the plurality of measuring sensitive elements 9. By arranging a gel substrate 8 in the accommodating cavity 7 of the support structure 6 and using its lower thermal conductivity to insulate the detector, it is beneficial to reduce the heat loss of the measuring sensitive element 9, and to reduce the influence of the external ambient temperature on the measuring sensitive element 9, effectively reducing the thermal response time of the detector, suppressing the interference of the metal electrode on the detector signal output, and improving the performance of the detector; by arranging a plurality of measuring sensitive elements 9 above the support structure 6, it is possible to achieve all-round detection of infrared radiation in different directions and wavelengths, and improve the sensitivity and response time of the detector; by arranging a heat diffusion shielding area between a plurality of measuring sensitive elements 9, it is possible to achieve independent operation of each measuring sensitive element 9 without interfering with each other, thereby ensuring that the receiving capacity of each measuring sensitive element 9 reaches the optimal level, suppressing high signals so that the energy is evenly distributed on each measuring sensitive element 9, and being able to effectively detect infrared radiation signals and convert them into electrical signal outputs.

[0032] The measuring sensitive element 9 is composed of a main sensitive element 10, a first sensitive element 11 and a second sensitive element 12; the first sensitive element 11 and the second sensitive element 12 are arranged on both sides of the main sensitive element 10, and the area of ​​the main sensitive element 10 is larger than that of the first sensitive element 11 and the second sensitive element 12. By arranging the main sensitive element 10, the first sensitive element 11 and the second sensitive element 12, the area of ​​the main sensitive element 10 is larger than that of the first sensitive element 11 and the second sensitive element 12, so that the measurement of the detector is more accurate. The main sensitive element 10 is a triangle or a fan; one side of the main sensitive element 10 is parallel to one side of the first sensitive element 11 and the length is equal; the other side of the main sensitive element 10 is parallel to one side of the second sensitive element 12 and the length is equal. The main sensitive element 10 is an isosceles triangle, and the first sensitive element 11 and the second sensitive element 12 are right-angled trapezoids. By setting the side of the main sensitive element 10 parallel to the first sensitive element 11 and the second sensitive element 12, the energy between the main sensitive element 10 and the first sensitive element 11 and the second sensitive element 12 is evenly distributed, so that when infrared radiation of different directions and wavelengths shines into the sensitive elements, all-round detection can be performed through different sensitive elements, thereby improving the sensitivity and response time of the detector.

[0033] A first shielding area 13 and a second shielding area 14 are provided between the main sensitive element 10 and the first sensitive element 11 and the second sensitive element 12; a third shielding area 15 is provided between the first sensitive element 11 and the second sensitive element 12. By providing the first shielding area 13, the second shielding area 14 and the third shielding area 15, each sensitive element can work independently without interfering with each other, so that energy is evenly distributed and the measurement of the detector is more accurate. The main sensitive element 10, the first sensitive element 11, the second sensitive element 12, the first shielding area 13, the second shielding area 14 and the third shielding area 15 form a square, which is located above the center of the PCB board 5. By forming a square with the main sensitive element 10, the first sensitive element 11, the second sensitive element 12, the first shielding area 13, the second shielding area 14 and the third shielding area 15, the receiving area of ​​each sensitive element is optimized. The first shielding area 13, the second shielding area 14 and the third shielding area 15 form a Y shape; the first sensitive element 11 and the second sensitive element 12 are located on both sides of the third shielding area 15; the right-angled short sides of the first sensitive element 11 and the second sensitive element 12 are parallel, and the length of the right-angled short sides of the first sensitive element 11 and the second sensitive element 12 is equal to the length of the third shielding area 15. The length of the first shielding area 13 is equal to the length of the second shielding area 14; the length of the first shielding area 13 and the length of the second shielding area 14 are both greater than the length of the third shielding area 15. The first shielding area 13, the second shielding area 14 and the third shielding area 15 form a Y shape, so that the shielding effect between the sensitive elements is good, and the received energy between the sensitive elements is evenly distributed, so that the sensitive elements react faster and meet the functional requirements of fast and high response.

[0034] The state of the gel substrate 8 changes with temperature. When the temperature decreases, the gel substrate 8 changes from a sol-mixed state to a gel state. When the temperature increases, the gel substrate 8 changes from a gel-mixed state to a sol-mixed state. The temperature of the gel substrate 8 in the gel-sol mixed state can be 42°C, 55°C or 68°C. The gel substrate 8 is a temperature-sensitive gel. The system volume or phase state (gel state or sol state) of the temperature-sensitive gel changes with temperature. The temperature-sensitive hydrogel includes poly (N-isopropylacrylamide) or polyacrylamide and polyethylene glycol copolymer. When the ambient temperature becomes cold, the gel substrate 8 solidifies and releases a certain amount of heat, and at the same time plays a role in heat insulation and heat preservation for the sensitive element, which is beneficial to reducing the influence of the ambient temperature. When the ambient temperature increases, the gel substrate 8 sol-absorbs the heat of the surrounding environment, reduces the thermal conductivity of the gel substrate 8, improves the effect of heat insulation and heat preservation, and is beneficial to reducing the influence of the ambient temperature.

[0035] The lower side of the tube holder 3 is provided with detection pins, which include a first signal output pin 16, a second signal output pin 17, a third signal output pin 18, a positive power supply pin 19, a negative power supply pin 20 and a ground pin 21; the detection pins pass through the tube holder 3, the detector gasket 4 and are connected to the PCB board 5; preferably, the first signal output pin 16, the second signal output pin 17, the third signal output pin 18, the positive power supply pin 19, the negative power supply pin 20 and the ground pin 21 are distributed in a circle formed by the main sensitive element 10, the first sensitive element 11, the second sensitive element 1 2. Around the square formed by the first shielding area 13, the second shielding area 14 and the third shielding area 15; more preferably, the center distance between the second signal output pin 17 and the main sensitive element 10 can be 0.082mm, 0.09mm or 0.098mm, the first signal output pin 16, the second signal output pin 17 and the third signal output pin 18 form an equilateral triangle, and the positive power supply pin 19, the negative power supply pin 20 and the ground pin 21 are evenly distributed between the first signal output pin 16, the second signal output pin 17 and the third signal output pin 18. The reasonable distribution of the detector pins can improve the output effect of the signal.

[0036] 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 high-speed, fast-response multi-element pyroelectric infrared detector, comprising a housing (1), characterized in that: A plurality of infrared filters (2) are arranged on the shell (1); 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; a detector gasket (4) is arranged on the tube seat (3); a PCB board (5) is arranged on the detector gasket (4); a plurality of support structures (6) are arranged on the PCB board (5); a receiving cavity (7) is provided above the support structure (6); a gel substrate (8) is provided in the receiving cavity (7); a measurement sensitive element (9) is provided above the support structure (6); the measurement sensitive element (9) is arranged opposite to the infrared filter (2); and a heat diffusion shielding area is provided between the plurality of sensitive elements.

2. The high-speed, fast-response multi-element pyroelectric infrared detector according to claim 1, characterized in that: The measuring sensitive element (9) comprises: a main sensitive element (10), a first path sensitive element (11) and a second path sensitive element (12); the first path sensitive element (11) and the second path sensitive element (12) are arranged on both sides of the main sensitive element (10), and the area of ​​the main sensitive element (10) is larger than that of the first path sensitive element (11) and the second path sensitive element (12).

3. The high-speed, fast-response multi-element pyroelectric infrared detector according to claim 2, characterized in that: A first shielding area (13) and a second shielding area (14) are provided between the main sensitive element (10) and the first sensitive element (11) and the second sensitive element (12); and a third shielding area (15) is provided between the first sensitive element (11) and the second sensitive element (12).

4. The high-speed, fast-response multi-element pyroelectric infrared detector according to claim 3, characterized in that: The main sensitive element (10) is triangular or fan-shaped; One side of the main sensitive element (10) is parallel to one side of the first sensitive element (11) and has the same length; The other side of the main sensitive element (10) is parallel to one side of the second sensitive element (12) and has the same length.

5. The high-speed, fast-response multi-element pyroelectric infrared detector according to claim 4, characterized in that: The main sensitive element (10) is an isosceles triangle, and the first sensitive element (11) and the second sensitive element (12) are right-angled trapezoids.

6. The high-speed, fast-response multi-element pyroelectric infrared detector according to claim 5, characterized in that: The main sensitive element (10), the first sensitive element (11), the second sensitive element (12), the first shielding area (13), the second shielding area (14) and the third shielding area (15) form a square.

7. The high-speed, fast-response multi-element pyroelectric infrared detector according to claim 6, characterized in that: The first shielding area (13), the second shielding area (14) and the third shielding area (15) form a Y shape; The first sensitive element (11) and the second sensitive element (12) are located on both sides of the third shielding area (15); the right-angled short sides of the first sensitive element (11) and the second sensitive element (12) are parallel, and the length of the right-angled short sides of the first sensitive element (11) and the second sensitive element (12) is equal to the length of the third shielding area (15).

8. The high-speed, fast-response multi-element pyroelectric infrared detector according to claim 7, characterized in that: The length of the first shielding area (13) is equal to the length of the second shielding area (14); and the length of the first shielding area (13) and the length of the second shielding area (14) are both greater than the length of the third shielding area (15).

9. The high-speed, fast-response multi-element pyroelectric infrared detector according to claim 8, characterized in that: The state of the gel substrate (8) changes with temperature. When the temperature decreases, the gel substrate (8) changes from a sol mixed state to a gel state, and when the temperature increases, the gel substrate (8) changes from a gel to a sol mixed state. The temperature of the gel substrate (8) when in the gel and sol mixed state is 40-70°C.

10. The high-speed, fast-response multi-element pyroelectric infrared detector according to claim 9, characterized in that: Detection pins are provided on the lower side of the tube holder (3), and the detection pins include a first signal output pin (16), a second signal output pin (17), a third signal output pin (18), a positive power supply pin (19), a negative power supply pin (20) and a ground pin (21); the detection pins penetrate the tube holder (3), the detector gasket (4) and are connected to the PCB board (5).

11. The high-speed, fast-response multi-element pyroelectric infrared detector according to claim 10, characterized in that: The first signal output pin (16), the second signal output pin (17), the third signal output pin (18), the positive power supply pin (19), the negative power supply pin (20) and the ground pin (21) are distributed in a circular pattern around a square formed by the main sensitive element (10), the first sensitive element (11), the second sensitive element (12), the first shielding area (13), the second shielding area (14) and the third shielding area (15).

12. The high-speed, fast-response multi-element pyroelectric infrared detector according to claim 10, characterized in that: The center distance between the second signal output pin (17) and the main sensitive element (10) is 0.08 mm-0.1 mm, the first signal output pin (16), the second signal output pin (17) and the third signal output pin (18) form an equilateral triangle, and the positive power supply pin (19), the negative power supply pin (20) and the ground pin (21) are evenly distributed between the first signal output pin (16), the second signal output pin (17) and the third signal output pin (18).

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