CN114295220A - Pyroelectric infrared sensor - Google Patents
Pyroelectric infrared sensor Download PDFInfo
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- CN114295220A CN114295220A CN202111512549.5A CN202111512549A CN114295220A CN 114295220 A CN114295220 A CN 114295220A CN 202111512549 A CN202111512549 A CN 202111512549A CN 114295220 A CN114295220 A CN 114295220A
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Abstract
The invention belongs to the technical field of detection equipment, and particularly relates to a pyroelectric infrared sensor which comprises a pipe cap, wherein the pipe cap is matched with a heat conduction base to form a cavity, the upper part of the heat conduction base is connected with a printed board through a pin, the middle part of the printed board is provided with a through hole, a first support, a second support and a sensitive element are sequentially arranged in the through hole in the vertical direction from bottom to top, and the first support and the second support form a support for the sensitive element; a cavity is arranged in the first support, heat-conducting silicone oil is filled in the cavity, heat dissipation holes are formed in the bottom of the first support, and an oil-proof breathable film is used for sealing; in the invention, the second support is made of memory metal and is in a solid wavy shape, when the second support absorbs heat, the second support deforms and stretches upwards, the distance between the sensitive element and the printed board and the first support is increased, and the heat insulation layer between the sensitive element and the second support can isolate the heat of the second support, thereby reducing the influence of heat generated in the sensor on the sensitive element.
Description
Technical Field
The invention belongs to the technical field of detection equipment, and particularly relates to a pyroelectric infrared sensor.
Background
The infrared detector is an energy converter which converts invisible infrared radiation energy into voltage signals which are easy to measure, and is mainly used for detecting human body movement and illegal invasion and giving an alarm. The infrared detection technology has unique advantages, so that the infrared detection technology is widely researched and applied in the fields of military defense and civil use, and particularly under the promotion of traction of military requirements and development of related technologies, the infrared detection technology serving as a high and new technology is more widely applied and more important in position in the future.
The pyroelectric infrared sensor is one kind of infrared detector, has not own any type radiation, and the device consumption is very little, the disguise is good, sensitivity is high, the outward appearance is small and exquisite and low price's advantage, however, has the space between current pyroelectric infrared sensor's the printing board and the sensitive unit, so sensitive unit can produce stress deformation under the influence of temperature, pressure, leads to the accuracy of detector to reduce, appears the mistake and reports.
In view of the above, in order to overcome the above technical problems, the present invention provides a pyroelectric infrared sensor, which solves the above technical problems.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: a gap exists between a printed board and a sensitive element of the conventional pyroelectric infrared sensor, so that the sensitive element can generate stress deformation under the influence of temperature and pressure, the accuracy of a detector is reduced, and false alarm occurs.
The pyroelectric infrared sensor comprises a pipe cap, wherein the pipe cap is matched with a heat conduction base to form a cavity, a placing hole is formed in the upper end face of the pipe cap, and an infrared window sheet is embedded in the placing hole; the upper part of the heat conduction base is connected with the printed board through a pin, one end of the pin is fixedly connected with the lower end face of the printed board, the other end of the pin penetrates through the heat conduction base and extends to the outside of the heat conduction base, a through hole is formed in the middle of the printed board, the number of the through holes is two, and a first support column, a second support column and a sensitive element are sequentially arranged in the through hole in the vertical direction from bottom to top; a cavity is arranged in the first support column, heat conduction silicone oil is filled in the cavity, and the upper end face of the first support column is fixedly connected with the lower end face of the second support column.
Preferably, the first support column is made of heat-conducting plastics and is fixedly connected to the inner wall of the through hole through a cooling fin.
Preferably, more than one heat dissipation hole is formed in the bottom of the first support, and the heat dissipation holes are sealed through oil-proof breathable films.
Preferably, the second pillar is made of memory metal, and the cross section of the second pillar is wavy.
Preferably, No. two pillars pass through the heat insulation layer with sensitive unit and be connected, heat insulation layer bottom and No. two pillar top fixed connection, heat insulation layer top and sensitive unit bottom fixed connection.
Preferably, the sensitive cells comprise a receiving sensitive cell and a compensating sensitive cell.
The invention has the following beneficial effects:
1. according to the pyroelectric infrared sensor, the sensitive element is arranged on the printed board through the first support column and the second support column, and the first support column and the second support column support the sensitive element, so that the temperature stress is reduced, and the deformation of the sensitive element under the external pressure is avoided;
2. according to the pyroelectric infrared sensor, the first support is connected with the inner wall of the through hole of the printed board through the radiating fin, and the radiating hole is formed in the bottom of the first support, so that the radiating efficiency is improved;
3. according to the pyroelectric infrared sensor, the second support column is made of memory metal, the cross section of the second support column is wavy, after the second support column absorbs heat, deformation is generated and the second support column stretches upwards, the distance between the sensitive element and the printed board and the distance between the sensitive element and the first support column are increased, the heat insulation layer between the sensitive element and the second support column can isolate the heat of the second support column, and the influence of the heat of the second support column on the sensitive element is reduced.
Drawings
The invention will be further explained with reference to the drawings.
FIG. 1 is a cross-sectional view of the body of the present invention;
FIG. 2 is an enlarged view of a portion of FIG. 1 at A in accordance with the present invention;
in the figure: the device comprises a pipe cap 1, a heat conduction base 2, an infrared window piece 3, pins 4, a printed board 5, through holes 6, a first support 7, a cavity 71, a heat radiating fin 72, a heat radiating hole 73, an oil-proof air-permeable film 74, a second support 8, a heat insulating layer 81, a sensitive element 9, a receiving sensitive element 91 and a compensating sensitive element 92;
Detailed Description
In order to make the technical means, the creation characteristics, the achievement purposes and the effects of the invention easy to understand, the invention is further described with the specific embodiments.
As shown in fig. 1-2, the pyroelectric infrared sensor of the present invention comprises a cap 1, the cap 1 and a heat conducting base 2 are matched to form a cavity, a placing hole is arranged on the upper end surface of the cap 1, and an infrared window 3 is embedded in the placing hole; the upper part of the heat conduction base 2 is connected with a printed board 5 through a pin 4, one end of the pin 4 is fixedly connected with the lower end face of the printed board 5, the other end of the pin 4 penetrates through the heat conduction base 2 and extends to the outside of the heat conduction base 2, a through hole 6 is formed in the middle of the printed board 5, the number of the through holes 6 is two, and a first support column 7, a second support column 8 and a sensitive element 9 are sequentially arranged in the vertical direction of the through hole 6 from bottom to top; a cavity 71 is arranged in the first support column 7, heat-conducting silicone oil is filled in the cavity 71, and the upper end face of the first support column 7 is fixedly connected with the lower end face of the second support column 8;
when the pyroelectric infrared sensor starts to work, the infrared window sheet 3 at the upper end of the tube cap 1 is filtered to remove impurities and then is projected onto the sensitive element 3, so that the printed board 5 outputs a voltage signal; when the pyroelectric infrared sensor works, the temperature in the sensor rises under the influence of the external temperature, meanwhile, the printed board 5 works to generate heat, at the moment, the heat-conducting silicon oil in the cavity 71 absorbs the heat, the heat generated by the printed board 5 is reduced from moving upwards, the deformation of the sensitive element 9 due to temperature stress is reduced, the damage of the printed board 5 due to self overheating is also reduced, and the service life of the printed board 5 is prolonged; meanwhile, the first support 7 and the second support 8 support the sensitive element 9, so that the temperature stress is further reduced, the sensitive element 9 is prevented from deforming when being subjected to external pressure, the overload resistance of the sensor is improved, and the accuracy and the sensitivity of the sensor are improved.
As a specific embodiment of the present invention, the first pillar 7 is made of heat conductive plastic and is fixedly connected to the inner wall of the through hole 6 through a heat sink 72;
with the increase of the working time of the pyroelectric infrared sensor, the heat generated by the printed board 5 is continuously increased, and the heat absorbed by the heat-conducting silicone oil is more and more, in the invention, the first strut 7 is made of heat-conducting plastic, and the heat-conducting plastic has the characteristic of uniform heat dissipation and can better dissipate the heat of the heat-conducting silicone oil; pillar 7 and fin 72 connect the inner wall at through-hole 6 with similar unsettled connected mode, cooperate through heat conduction silicon oil and fin 72, make the heat distribute from through-hole 6, and the heat that distributes in the through-hole 6 distributes to the external world through pipe cap 1 and heat conduction base 2, improves the radiating effect, further reduces the influence of temperature stress to sensitive 9, improves the accuracy and the sensitivity of sensor.
As a specific embodiment of the present invention, the bottom of the first support 7 is provided with one or more heat dissipation holes 73, and the heat dissipation holes 73 are sealed by an oil-proof air-permeable film 74;
the heat of the heat-conducting silicone oil can be dissipated from the shell of the first support 7 and can be dissipated through the heat dissipation holes 73 formed in the bottom of the first support 7, and due to the flowability of the heat-conducting silicone oil, the heat dissipation holes 73 are sealed by the oil-proof breathable film 74, so that the heat-conducting silicone oil can be dissipated and ventilated, the temperature of the heat-conducting silicone oil is reduced, and the heat-conducting silicone oil can be prevented from leaking; the heat that heat conduction silicon oil gived off through louvre 73 gives off to the external world through pipe cap 1 and heat conduction base 2, has reduced pyroelectric infrared sensor's inside heat, reduces the influence of temperature to sensitive 9, improves the accuracy and the sensitivity of sensor.
As a specific embodiment of the present invention, the second pillar 8 is made of memory metal, and the cross-sectional shape of the second pillar 8 is wavy;
when the external temperature and the temperature of the first support column 7 are continuously increased, the second support column 8 starts to absorb heat, the second support column 8 is a wavy support column made of memory metal, when the second support column 8 absorbs heat, the heat in the sensor is reduced, the influence of the temperature in the sensor on the sensitive element 9 is reduced, meanwhile, the memory metal absorbs heat to deform and stretch upwards, the distance between the sensitive element 9 and the printed board 5 and the first support column 7 is increased, the influence of the heat generated by the printed board 5 on the sensitive element 9 is reduced, and the accuracy and the sensitivity of the sensor are improved.
As a specific embodiment of the present invention, the second pillar 8 is connected to the sensing element 9 through a heat insulating layer 81, the bottom of the heat insulating layer 81 is fixedly connected to the top of the second pillar 8, and the top of the heat insulating layer 81 is fixedly connected to the bottom of the sensing element 9;
along with No. two pillars 8 constantly absorb heat, the temperature risees, in order to prevent that No. two pillars 8's temperature from influencing sensitive unit 9, No. two pillars 8 are connected through heat insulation layer 81 with sensitive unit 9, and heat insulation layer 81 is used for insulating No. two pillars 8's heat, reduces the influence of temperature stress to sensitive unit 9, improves the accuracy and the sensitivity that sensitive unit 9 detected.
As a specific embodiment of the present invention, the sensitive cell 9 includes a receiving sensitive cell 91 and a compensating sensitive cell 92;
the sensitive element 9 comprises a receiving sensitive element 91 and a compensating sensitive element 92, wherein one receiving sensitive element 91 and one compensating sensitive element 92 form a compensating unit, when the receiving sensitive element moves in the positive direction, a positive → negative signal appears, and when the receiving sensitive element moves in the reverse direction, a negative → positive signal appears, so that the advancing direction can be distinguished, and the sensitivity and the accuracy of the sensor are improved.
The specific working process is as follows:
when the pyroelectric infrared sensor starts to work, the infrared window sheet 3 at the upper end of the tube cap 1 is filtered to remove impurities and then is projected onto the sensitive element 3, so that the printed board 5 outputs a voltage signal; when the pyroelectric infrared sensor works, the temperature in the sensor rises under the influence of the external temperature, meanwhile, the printed board 5 works to generate heat, at the moment, the heat-conducting silicon oil in the cavity 71 absorbs the heat, and the heat generated by the printed board 5 is reduced from moving upwards; meanwhile, the first support 7 and the second support 8 support the sensitive element 9, so that the temperature stress is further reduced, and the sensitive element 9 is prevented from deforming when being subjected to external pressure.
Along with pyroelectric infrared sensor's operating time increases, the heat that printing board 5 produced constantly increases, the absorptive heat of heat conduction silicon oil is also more and more, the heat of heat conduction silicon oil outwards gives off through a pillar 7 that has the even characteristics of heat dissipation, the heat of heat conduction silicon oil also can give off through the louvre 73 of a pillar 7 bottom simultaneously, heat conduction silicon oil cooperatees with fin 72 again, make the heat give off from through-hole 6, the heat that gives off in the through-hole 6 gives off to the external world through pipe cap 1 and heat conduction base 2, and the heat radiation effect is improved.
When the external temperature and the temperature of pillar 7 continuously increase, pillar 8 No. two begins to absorb the heat, has reduced the inside heat of sensor, and memory metal endotherm takes place deformation this moment, upwards tensile, has increased the distance of sensitive unit 9 with printing board 5, pillar 7, and along with No. two pillars 8 constantly absorb heat, the temperature risees, and heat insulation layer 81 just plays the effect of the heat of isolated pillar 8 to sensitive unit 9's influence.
The sensitive element 9 comprises a receiving sensitive element 91 and a compensating sensitive element 92, wherein the receiving sensitive element 91 and the compensating sensitive element 92 form a compensating unit, when the receiving sensitive element moves in the positive direction, a positive → negative signal appears, and when the receiving sensitive element moves in the reverse direction, a negative → positive signal appears, so that the advancing direction can be distinguished, and the sensitivity and the accuracy of the sensor are improved.
The foregoing illustrates and describes the principles, general features, and advantages of the present invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (6)
1. A pyroelectric infrared sensor is characterized in that: the heat-conducting tube cap comprises a tube cap (1), wherein the tube cap (1) is matched with a heat-conducting base (2) to form a cavity, a placing hole is formed in the upper end face of the tube cap (1), and an infrared window sheet (3) is embedded in the placing hole; the upper part of the heat conduction base (2) is connected with a printed board (5) through a pin (4), one end of the pin (4) is fixedly connected with the lower end face of the printed board (5), the other end of the pin penetrates through the heat conduction base (2) and extends to the outside of the heat conduction base (2), a through hole (6) is formed in the middle of the printed board (5), the number of the through holes (6) is two, and a first support column (7), a second support column (8) and a sensitive element (9) are sequentially arranged in the vertical direction of the through hole (6) from bottom to top; a cavity (71) is arranged in the first supporting column (7), heat-conducting silicone oil is filled in the cavity (71), and the upper end face of the first supporting column (7) is fixedly connected with the lower end face of the second supporting column (8).
2. The pyroelectric infrared sensor according to claim 1, wherein: the first support column (7) is made of heat-conducting plastics and is fixedly connected to the inner wall of the through hole (6) through a radiating fin (72).
3. The pyroelectric infrared sensor as defined in claim 2, wherein: more than one heat dissipation hole (73) is formed in the bottom of the first support (7), and the heat dissipation holes (73) are sealed by oil-proof air-permeable films (74).
4. The pyroelectric infrared sensor according to claim 1, wherein: the second support column (8) is made of memory metal, and the section shape of the second support column (8) is wavy.
5. The pyroelectric infrared sensor according to claim 1, wherein: no. two pillars (8) are connected through heat insulation layer (81) with sensitive unit (9), heat insulation layer (81) bottom and No. two pillars (8) top fixed connection, heat insulation layer (81) top and sensitive unit (9) bottom fixed connection.
6. The pyroelectric infrared sensor as defined in claim 4, wherein: the sensitive element (9) comprises a receiving sensitive element (91) and a compensating sensitive element (92).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111512549.5A CN114295220A (en) | 2021-12-11 | 2021-12-11 | Pyroelectric infrared sensor |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111512549.5A CN114295220A (en) | 2021-12-11 | 2021-12-11 | Pyroelectric infrared sensor |
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| CN114295220A true CN114295220A (en) | 2022-04-08 |
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| CN202111512549.5A Pending CN114295220A (en) | 2021-12-11 | 2021-12-11 | Pyroelectric infrared sensor |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201034740Y (en) * | 2007-04-09 | 2008-03-12 | 中国水利水电科学研究院 | Quick-speed strata temperature measurement sensor for dam leak circulation path detecting |
| CN106289538A (en) * | 2016-08-26 | 2017-01-04 | 淄博博山新颖传感器厂 | Novel pyroelectric infrared sensor |
| CN206992178U (en) * | 2017-06-01 | 2018-02-09 | 林建明 | A kind of shockproof radiating assembling case of vehicular battery |
| CN209624449U (en) * | 2019-01-18 | 2019-11-12 | 厦门标安科技有限公司 | A kind of heat insulation-type calorimeter |
-
2021
- 2021-12-11 CN CN202111512549.5A patent/CN114295220A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201034740Y (en) * | 2007-04-09 | 2008-03-12 | 中国水利水电科学研究院 | Quick-speed strata temperature measurement sensor for dam leak circulation path detecting |
| CN106289538A (en) * | 2016-08-26 | 2017-01-04 | 淄博博山新颖传感器厂 | Novel pyroelectric infrared sensor |
| CN206992178U (en) * | 2017-06-01 | 2018-02-09 | 林建明 | A kind of shockproof radiating assembling case of vehicular battery |
| CN209624449U (en) * | 2019-01-18 | 2019-11-12 | 厦门标安科技有限公司 | A kind of heat insulation-type calorimeter |
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