CN202305066U - Low-frequency pulsation/static pressure sensor - Google Patents
Low-frequency pulsation/static pressure sensor Download PDFInfo
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- CN202305066U CN202305066U CN 201120400246 CN201120400246U CN202305066U CN 202305066 U CN202305066 U CN 202305066U CN 201120400246 CN201120400246 CN 201120400246 CN 201120400246 U CN201120400246 U CN 201120400246U CN 202305066 U CN202305066 U CN 202305066U
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- pressure sensor
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Abstract
The utility model belongs to a sensor and particularly discloses a low-frequency pulsation/static pressure sensor, which comprises a casing, a round protection sheet, a sensitive element and a press connection element, wherein the round protection sheet is arranged at the bottom of the casing, the sensitive element and the press connecting element are arranged in the casing, the sensitive element and the press connecting element are sequentially arranged on the top of the outer round protection sheet from top to bottom, a circuit board and a shielding element are sequentially arranged on the top of the press connecting element from bottom to top, the lower part of a case is sheathed outside the upper part of the casing, in addition, a cavity is formed between the case and the casing, the circuit board and the shielding element are positioned in the cavity, the center of the top of the case is provided with a socket, and the socket is sequentially connected with the circuit board and the sensitive element through conducting wires. The sensor disclosed by the utility model can be used for measuring the static pressure and can also be used for measuring the pulsation pressure.
Description
Technical field
The utility model belongs to a kind of sensor, is specifically related to a kind ofly can be used for the measurement of low frequency pulsating pressure and the pressure transducer of static pressure force measurement
Background technology
Pressure transducer is divided into dynamic pressure transducer and static pressure sensor by measured signal.The conventional dynamic pressure transducer is based on the piezoelectric type principle, and this sensor frequency response is high, and dynamic perfromance is good, but can only measure dynamic pressure, can not measure static pressure.Traditional static pressure sensor mainly contains pressure resistance type and strain chip principle; The sensor of these two kinds of principles adopts T type impulse air inlet cavity volume more; Pressure guiding pipe can cause the cavity volume effect, thereby can reduce the dynamic response characteristic of sensor greatly, is not suitable for the measurement of dynamic pressure.Therefore both all can not realize can measure static pressure for these two kinds of sensors, can measure fluctuation pressure again.
Summary of the invention
The purpose of the utility model is to provide a kind of low frequency pulsating/static pressure sensor, and this sensor both can measure static pressure, also can measure fluctuation pressure.
Realize the technical scheme of the utility model purpose: a kind of low frequency pulsating/static pressure sensor; Comprise housing, be installed in the circular screening glass of housing bottom and be installed in sensitive element, the crimp in the housing; Circular screening glass top is provided with sensitive element, crimp from bottom to up successively; The crimp top is provided with circuit board, shielding part from bottom to up successively, and outer casing underpart is enclosed within outside the housing top and both form cavity, and circuit board, shielding part are positioned at this cavity; The cover top portion center is provided with socket, and socket is connected through lead with circuit board, sensitive element successively.
The center of described circular screening glass is provided with center hole, and the edge circumferentially evenly is provided with a plurality of circular ports between center hole and annular lip.
Described circuit board comprises power supply, holding circuit, mu balanced circuit, signal conditioning circuit, low-pass filter circuit, high-pass filtering circuit, ac amplifier circuit, and sensitive element is connected with an output terminal of signal conditioning circuit; The input end of signal conditioning circuit is connected with mu balanced circuit, holding circuit, power supply successively, and another output terminal of signal conditioning circuit is connected with low-pass filter circuit, high-pass filtering circuit, ac amplifier circuit successively; Mu balanced circuit also is connected with low-pass filter circuit; The static pressure output signal output part of low-pass filter circuit also is connected with socket, and the dynamic pressure output signal output part of ac amplifier circuit also is connected with socket.
Described circuit board comprises also+the 2.5V benchmark that+2.5V benchmark all is connected with mu balanced circuit, low-pass filter circuit.
The static pressure output signal output part of described low-pass filter circuit, the dynamic pressure output signal output part of ac amplifier circuit all also are connected with feed-through filter.
Described high-pass filtering circuit is made up of first resistance and first capacitances in series.
The transient voltage restraining diode of connecting between said power supply and the ground, the current-limiting resistance of between power supply and transient voltage restraining diode, contacting.
The useful technique effect of the utility model: the sensor of the utility model adopts the pressure resistance type sensitive element; On circuit, be provided with a high-pass filtering circuit; Sensor has independently static pressure output and dynamic pressure output interface, and the static pressure output area is 0～+ 5V, the dynamic pressure normality is output as+2.5V; When pressure-20KPa～+ during the 20KPa fluctuation, direct proportion output 0～+ voltage signal of 5V.The sensor of the utility model has structurally designed accurate flush type encapsulating structure, and the impulse air intake duct is a straight barrel type, and the sensor dynamic characteristic of this structure is better and can measure static pressure (0Hz) signal.Be not damaged for the sensitive element diaphragm of protecting sensor simultaneously; On the pressure-sensitive end face of sensor, designed the screening glass of " plum blossom " type cleverly; Have 8 circular holes on the screening glass; Not only guaranteed the transmission of dynamic pressure, and avoided sensor produce and use in collide with and touch damage.The spike of the pressure transducer Ceng Yinwei power supply on the satellite and the rocket equipment is burnt out; The utility model oscillatory pressure pick-up is through adopting anti-power supply spike circuit on circuit; The protection sensor is not damaged, and has passed through the examination of CS106 power lead deglitch test.The sensor complete machine structure of the utility model is simple and reliable, is easy to processing.On circuit design, adopted anti-power supply spike design
Description of drawings
Fig. 1 is the physical construction synoptic diagram of a kind of low frequency pulsating/static pressure sensor that the utility model provided;
Fig. 2 is the accurate flush type structural representation of a kind of low frequency pulsating/static pressure sensor that the utility model provided;
Fig. 3 is a kind of screening glass structural drawing that the utility model provided;
Fig. 4 is the schematic block circuit diagram of a kind of low frequency pulsating/static pressure sensor that the utility model provided;
Fig. 5 is the high-pass filtering that the utility model provided and the circuit theory diagrams of ac amplifier circuit;
Fig. 6 is the anti-power supply spike circuit theory diagrams that the utility model provided.
Among the figure: 1, screening glass, 101. center holes, 102. circular ports, 103. annular lip;
2, sensitive element, 3, crimp, 4, housing;
5, circuit board, 501. power supplies, 502. holding circuits, 503. mu balanced circuits, 504. signal conditioning circuits, 505. low-pass filter circuits, 506. high-pass filtering circuits, 507. ac amplifier circuits, 508.+2.5V benchmark;
6, shielding part, 7, shell, 8, socket, 9. welded post, 10. feed-through filter; 11. first O-ring seal, 12. second O-ring seals, 13. first screws, 14. sunk screws, 15. the 3rd O-ring seals; 16. first lead, 17. second screws, 18. second leads, 19. privates, 20. the 3rd screws.
Embodiment
Below in conjunction with accompanying drawing and embodiment the utility model is done further explain.
As shown in Figure 1, housing 4 is the cylindrical tube of hollow, and this cylindrical tube has the two ends cylindrical shell, and this cylindrical tube epimere internal diameter is big, the hypomere internal diameter is little.Crimp 3 is enclosed within the housing 4, and crimp 3 is through being fixed on the end face of 4 upper and lower sections cylindrical shell junctions of housing along four first screws of circumferentially evenly arranging 13.Sensitive element 2 is embedded in the bottom of housing 4 hypomere cylindrical shells, and sensitive element 2 and between the crimp 3 of its end face, be provided with the second close circle 12 is provided with first O-ring seal 11 between sensitive element 2 and its outside housing 4.Screening glass 1 is embedded in housing 4 bottoms through the annular lip 103 that is positioned at its upper surface.Screening glass 1 is spacing in housing 4 with sensitive element 2.The bottom surface of sensitive element 2 is the pressure-sensitive end face of this sensor.
Like Fig. 1, Fig. 2 and shown in Figure 3, the center of circular screening glass 1 is provided with center hole 101, and the edge circumferentially evenly is provided with seven circular ports 102 between center hole 101 and annular lip 103.Circular port 102 makes screening glass 1 be " plum blossom " type.On the pressure-sensitive end face of sensor, designed the screening glass 1 of " plum blossom " type dexterously, not only guaranteed the transmission of dynamic pressure, and avoided sensor produce and use in collide with and touch damage.Circular screening glass 1 has constituted the pressure-sensitive structure that accurate flush type designs with sensitive element 2.
As shown in Figure 1, on the epimere cylindrical shell end face of housing 4 circuit board 5 is installed, on circuit board 5 end faces shielding part 6 is installed, along four second screws of circumferentially evenly arranging 17 shielding part 6, circuit board 5 are fixed on the epimere cylindrical shell end face of housing 4.Circuit board 5 bottoms are connected with sensitive element 2 through two first leads 16.Shielding part 6 tops one side is installed with welded post 9 through screw thread, is installed with feed-through filter 10 through screw thread in the welded post 9, and feed-through filter 10 bottoms are connected with circuit board 5 tops through second lead 18.Shell 7 is the inverted U-shaped hollow cylinder.Shell 7 bottoms are enclosed within outside the epimere cylindrical shell of housing 4, through being fixedly connected along four sunk screws 14 circumferentially evenly arranging, are provided with the 3rd O-ring seal 15 between shell 7 and the housing 4 between shell 7 and the housing 4.Circuit board 5 also is embedded in the shell 7 with shielding part 6.Shell 7 top center are equipped with socket 8, and socket 8 logical four the 3rd screws of circumferentially evenly arranging 20 are fixed on the shell 7.Socket 8 bottoms are connected with feed-through filter 10 tops through privates 19.
As shown in Figure 4, the circuit of the sensor that the utility model provided comprises sensitive element 2, circuit board 5, socket 8 and feed-through filter 10.Circuit board 5 comprise power supply 501, holding circuit 502, mu balanced circuit 503, signal conditioning circuit 504, low-pass filter circuit 505, high-pass filtering circuit 506, ac amplifier circuit 507 and+2.5V benchmark 508.
As shown in Figure 4, sensitive element 2 is connected with an output terminal of signal conditioning circuit 504.The input end of signal conditioning circuit 504 is connected with mu balanced circuit 503, holding circuit 502, power supply 501 successively, and another output terminal of signal conditioning circuit 504 is connected with low-pass filter circuit 505, high-pass filtering circuit 506, ac amplifier circuit 507 successively.Mu balanced circuit 503 also respectively with low-pass filter circuit 505 ,+2.5V benchmark 508 is connected.The static pressure output signal output part of low-pass filter circuit 505 also all is connected with socket 8, feed-through filter 10, and the dynamic pressure output signal output part of ac amplifier circuit 507 also all is connected with socket 8, feed-through filter 10.Power supply 501 also is connected with feed-through filter 10.
As shown in Figure 4, power supply 501 is given signal conditioning circuit 504, low-pass filter circuit 505, high-pass filtering circuit 506, ac amplifier circuit 507 power supplies through holding circuit 502, mu balanced circuit 503 successively.Signal conditioning circuit 504 provides the electric current of 0.8mA for sensitive element 2; The voltage of sensitive element 2 output is through signal conditioning circuit 504 amplification, low-pass filter circuit 505, high-pass filtering circuit 506, ac amplifier circuit 507, realize respectively static pressure output interface and dynamic pressure output interface be 0～+ the normal voltage signal of 5V exports.+ 2.5V benchmark 508 is used to detect the voltage of mu balanced circuit 503.The electromagnetic interference signal that feed-through filter 10 suppresses by the lead introducing.Holding circuit 502 can be clamped to ratings with the peaking voltage that lead possibly occur with mu balanced circuit 503, and the sensor internal circuit is shielded.The chip MAX1452 that signal conditioning circuit 504 adopts U.S. MAXIM company to produce, this chip are special signal conditioners towards the piezoresistive transducer temperature compensation.
During sensor measurement static pressure that the utility model provided from the signal of static pressure output interface be 0～+ the normal voltage signal of 5V; Absolute pressure 0KPa is output as 0V; Absolute pressure 120KPa is output as+5V, is output as 4.1V under the normal temperature atmospheric pressure (100KPa), is convenient to sensor is carried out functional check.When measuring dynamic pressure from the signal of dynamic pressure output interface also be 0～+ 5V normal voltage signal, normality output (fluctuation pressure is 0KPa) is 2.5V, fluctuation pressure is output as 0V when being negative pressure 20KPa, fluctuation pressure is output as when being malleation 20KPa+5V.
As shown in Figure 5; First resistance R 5 and first capacitor C 6 are composed in series high-pass filtering circuit 507; Through R5 and C6 rationally are set the cutoff frequency of Hi-pass filter is made as 1Hz, thereby realizes only letting the dynamic pressure signal enter into ac amplifier circuit 507, thereby the dynamic pressure signal is from socket 8 outputs.Second resistance R 6, the 3rd resistance R 7, the 4th resistance R 8, the 5th resistance R 9 and amplifier U3B group ac amplifier circuit 507.One end of second resistance R 6 is connected with the junction of first resistance R 5 and first capacitor C 6, and the other end of second resistance R 6 is connected with the pin 5 of amplifier U3B with the 3rd resistance R 7 parallel connection backs.One end common ground of one end of the 4th resistance R 8 and first resistance R 5, the other end of the 4th resistance R 8 are connected with an end of the 5th resistance R 9, the pin 6 of amplifier U3B respectively.The other end of the 5th resistance R 9 is connected with the pin 7 of amplifier U3B.The amplifier U3B that ac amplifier circuit 507 adopts is that 1/2 redundant amplifier of low-pass filter circuit 505 used double operational TL062 constitutes; Further reduced number of elements; Practiced thrift cost of products; Through the value that resistance R 6, resistance R 7, resistance R 8, resistance R 9 rationally are set realized dynamic pressure output interface 0～+ output of 5V, and normality be output as 2.5V superpose into, be convenient to sensor is carried out functional check.
As shown in Figure 6; The transient voltage restraining diode S1 that between power supply 501 and ground, connects, when superpotential spike appearred in power supply 501, its working impedance dropped to very low conduction value immediately; Absorb the energy of power supply spike; And with voltage clamping to ratings, the protection sensor circuit prevents that the components and parts in the circuit are damaged.Between power supply 501 and transient voltage restraining diode S1, seal in current-limiting resistance R1, when transient voltage restraining diode S1 working impedance dropped to conduction value, current-limiting resistance R1 can play the protective effect to power supply 501.
Combine accompanying drawing and embodiment that the utility model has been done detailed description above; But the utility model is not limited to the foregoing description; In the ken that those of ordinary skills possessed, can also under the prerequisite that does not break away from the utility model aim, make various variations.The content of not doing in the utility model to describe in detail all can adopt prior art.
Claims (7)
1. low frequency pulsating/static pressure sensor; Comprise housing (4), be installed in the circular screening glass (1) of housing (4) bottom and be installed in sensitive element (2), the crimp (3) in the housing (4); Circular screening glass (1) top is provided with sensitive element (2), crimp (3) from bottom to up successively; Crimp (3) top is provided with circuit board (5), shielding part (6) from bottom to up successively, and shell (7) bottom is enclosed within outside housing (4) top and both form cavity, and circuit board (5), shielding part (6) are positioned at this cavity; Shell (7) top center is provided with socket (8), and socket (8) is connected through lead with circuit board (5), sensitive element (2) successively.
2. a kind of low frequency pulsating/static pressure sensor according to claim 1; It is characterized in that: the center of described circular screening glass (1) is provided with center hole (101), and the edge circumferentially evenly is provided with a plurality of circular ports (102) between center hole (101) and annular lip (103).
3. a kind of low frequency pulsating/static pressure sensor according to claim 1; It is characterized in that: described circuit board (5) comprises power supply (501), holding circuit (502), mu balanced circuit (503), signal conditioning circuit (504), low-pass filter circuit (505), high-pass filtering circuit (506), ac amplifier circuit (507), and sensitive element (2) is connected with an output terminal of signal conditioning circuit (504); The input end of signal conditioning circuit (504) is connected with mu balanced circuit (503), holding circuit (502), power supply (501) successively, and another output terminal of signal conditioning circuit (504) is connected with low-pass filter circuit (505), high-pass filtering circuit (506), ac amplifier circuit (507) successively; Mu balanced circuit (503) also is connected with low-pass filter circuit (505); The static pressure output signal output part of low-pass filter circuit (505) also is connected with socket (8), and the dynamic pressure output signal output part of ac amplifier circuit (507) also is connected with socket (8).
4. a kind of low frequency pulsating/static pressure sensor according to claim 3 is characterized in that: described circuit board (5) comprises also+2.5V benchmark (508) that+2.5V benchmark (508) all is connected with mu balanced circuit (503), low-pass filter circuit (505).
5. a kind of low frequency pulsating/static pressure sensor according to claim 3 is characterized in that: the static pressure output signal output part of described low-pass filter circuit (505), the dynamic pressure output signal output part of ac amplifier circuit (507) all also are connected with feed-through filter (10).
6. a kind of low frequency pulsating/static pressure sensor according to claim 3 is characterized in that: described high-pass filtering circuit (507) is composed in series by first resistance (R5) and first electric capacity (C6).
7. a kind of low frequency pulsating/static pressure sensor according to claim 3; It is characterized in that: the transient voltage restraining diode (S1) of connecting between said power supply (501) and the ground, the current-limiting resistance (R1) of between power supply (501) and transient voltage restraining diode (S1), contacting.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201120400246 CN202305066U (en) | 2011-10-19 | 2011-10-19 | Low-frequency pulsation/static pressure sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201120400246 CN202305066U (en) | 2011-10-19 | 2011-10-19 | Low-frequency pulsation/static pressure sensor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202305066U true CN202305066U (en) | 2012-07-04 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201120400246 Expired - Lifetime CN202305066U (en) | 2011-10-19 | 2011-10-19 | Low-frequency pulsation/static pressure sensor |
Country Status (1)
| Country | Link |
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| CN (1) | CN202305066U (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105973525A (en) * | 2015-10-14 | 2016-09-28 | 北京强度环境研究所 | High-reliability piezoresistive pressure sensor |
| CN105973507A (en) * | 2015-10-14 | 2016-09-28 | 北京强度环境研究所 | Miniaturization piezoresistive pressure sensor |
| CN107479776A (en) * | 2017-08-03 | 2017-12-15 | 京东方科技集团股份有限公司 | Pressure sensitivity detects circuit and its driving method, electronic installation |
| CN108845209A (en) * | 2018-06-28 | 2018-11-20 | 无锡中誉东莲电气技术有限公司 | A kind of frequency converter slow-speed of revolution pulsation detecting device |
| CN112577656A (en) * | 2020-12-10 | 2021-03-30 | 北京强度环境研究所 | Sensor |
| CN113607263A (en) * | 2020-05-04 | 2021-11-05 | 新力奇有限公司 | Vibration measuring assembly with accurate positioning device of height direction movement sensing piece |
-
2011
- 2011-10-19 CN CN 201120400246 patent/CN202305066U/en not_active Expired - Lifetime
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105973525A (en) * | 2015-10-14 | 2016-09-28 | 北京强度环境研究所 | High-reliability piezoresistive pressure sensor |
| CN105973507A (en) * | 2015-10-14 | 2016-09-28 | 北京强度环境研究所 | Miniaturization piezoresistive pressure sensor |
| CN107479776A (en) * | 2017-08-03 | 2017-12-15 | 京东方科技集团股份有限公司 | Pressure sensitivity detects circuit and its driving method, electronic installation |
| CN107479776B (en) * | 2017-08-03 | 2020-07-24 | 京东方科技集团股份有限公司 | Pressure-sensitive detection circuit, driving method thereof and electronic device |
| CN108845209A (en) * | 2018-06-28 | 2018-11-20 | 无锡中誉东莲电气技术有限公司 | A kind of frequency converter slow-speed of revolution pulsation detecting device |
| CN113607263A (en) * | 2020-05-04 | 2021-11-05 | 新力奇有限公司 | Vibration measuring assembly with accurate positioning device of height direction movement sensing piece |
| CN113607263B (en) * | 2020-05-04 | 2022-06-28 | 新力奇有限公司 | Vibration measuring assembly with accurate positioning device for height direction movement sensing part |
| CN112577656A (en) * | 2020-12-10 | 2021-03-30 | 北京强度环境研究所 | Sensor |
| CN112577656B (en) * | 2020-12-10 | 2022-04-29 | 北京强度环境研究所 | Sensor |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20120704 |
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| CX01 | Expiry of patent term |