CN2804830Y - Intelligent pressure sensor - Google Patents
Intelligent pressure sensor Download PDFInfo
- Publication number
- CN2804830Y CN2804830Y CN 200520083682 CN200520083682U CN2804830Y CN 2804830 Y CN2804830 Y CN 2804830Y CN 200520083682 CN200520083682 CN 200520083682 CN 200520083682 U CN200520083682 U CN 200520083682U CN 2804830 Y CN2804830 Y CN 2804830Y
- Authority
- CN
- China
- Prior art keywords
- transceiver
- chip computer
- pressure sensor
- filter capacitor
- external interface
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Images
Landscapes
- Measuring Fluid Pressure (AREA)
Abstract
The utility model relates to an intelligent pressure sensor used for measuring the liquid pressure of vehicles. An instruction which is input by an external interface, is transferred to a monolithic computer by a transceiver; the monolithic computer reads temperature data from a temperature signal amplifier and read pressure data from a pressure amplifier; after temperature correction, the pressure data is sent to the transceiver; the data transmitted by the monolithic computer is sent to the external interface by the transceiver; a power supply filtering protector is connected with an external power supply to realize filtration and the reverse connection protection of the power supply. After filtered and protected, the power supply is connected with an integrated voltage stabilizer and the transceiver; the integrated voltage stabilizer outputs stable direct current voltage to provide a power supply to the monolithic computer; after the output voltage is further filtered by a measuring filter, the output voltage is used by a temperature amplifier, the pressure amplifier and a precision bias voltage source; the precision bias voltage source provides bias voltage for a temperature and pressure sensor. The utility model has the functions of measurement, data processing and fault detection; addresses are found in a digital mode; sixteen sensors can be connected with the same control node.
Description
Technical field
The utility model relates to a kind of Intelligence sensor that is widely used in automobile, engineering truck and various liquid, gas pressure measurement field, is a kind of intelligent pressure sensor that is combined by computer technology, mechanics of communication and measuring technique.
Background technology
At present the various pressure transducer ubiquity precision used of automobile and engineering truck lower, non-linear serious, with the shortcoming of analog form transmission signal.Be example with the engine oil pressure pickup that often uses on the present vehicle, its principle is with sensor, Displaying Meter (microampere gauge outfit) and automobile storage battery series connection, the variation of engine oil pressure causes that sensor resistance changes, the impedance of series circuit is changed, thereby the electric current that flows through Displaying Meter is changed, reach the purpose of indicated pressure, the pointing accuracy of this sensor and sensor characteristic and battery voltage are closely related, and the advantage of sort circuit is that circuit is simple.The integrated pressure sensor that grew up in recent years, diffusion silicon pressure sensor particularly, low with cost, precision is high and obtained widespread use, but on automobile and engineering truck, use less, main cause has the following aspects: one, the most temperature influences of these sensors are serious, can't adapt to measurement environment.Its two, integrated pressure sensor is generally by semiconductor material processing, the ability that the restriction of manufacturing cost is impacted its anti-current is poor, so directly use it in automobile and the engineering truck than being easier to damage.Its three, directly transmit with simulating signal and must introduce interference, particularly automobile under bad working environments and engineering truck often come in contact bad, strong electromagnetic etc., cause the instrument misregister.Its four, adopt the pressure transducer cost of temperature compensation and transmitter too high, be difficult to be extensive use of on automobile and engineering truck.Pressure transducer used in everyday adopts simulating signal to transmit, if use a plurality of pressure transducer sensors on an equipment, certainly will use a large amount of lead-in wires, causes vehicle arrangement wiring harness complexity, has reduced system reliability.
Summary of the invention
The purpose of this utility model provides the intelligent pressure sensor that a kind of measuring accuracy height, antijamming capability are strong, simulating signal carried out digitized processing.
For achieving the above object, the utility model is characterised in that: comprise one-chip computer, temperature sensor, pressure transducer, temperature signal amplifier, pressure signal amplifier, accurate bias generator, measure wave filter, integrated regulator, transceiver, power filter protector and external interface; One-chip computer is accepted from the external interface and the instruction of sending by transceiver, requirement according to instruction, from temperature signal amplifier and pressure signal amplifier reading of data or carry out system failure detection, the data of measuring are temporary in the single-chip microcomputer internal register, after the process one-chip computer is handled and proofreaied and correct data, send on the external interface by transceiver; Temperature sensor and pressure transducer are made of measuring bridge, and its bias voltage is that accurate bias generator provides, to ensure the measuring accuracy of sensor; Temperature signal amplifier and pressure signal amplifier are regulated enlargement factor; Measure the power supply further filtering of wave filter, for the analog/digital converter of measuring operational amplifier, accurate bias generator and one-chip computer provides the galvanic current source with integrated regulator output; Integrated regulator provides stable dc supply for one-chip computer, measurement wave filter; Transceiver is after system powers on, wake-up circuit is ready transceiver, the instruction that external interface sends is converted to the digital command that one-chip computer is accepted by transceiver, and is that one-chip computer is performed, and the result of execution sends to external interface by one-chip computer by transceiver; The power filter protector prevents the power supply reversal connection, and the filtering external interference signals is imported power supply stably for integrated regulator and transceiver provide; External interface provides the energy for intelligence sensor and finishes the input of instruction and the output function of data.
According to described intelligent pressure sensor, it is characterized in that: one-chip computer is made of one-chip computer integrated circuit U2, pull-up resistor R3, R4, filter capacitor C4, C5, C6, C7 and inductance L 1.
According to described intelligent pressure sensor, it is characterized in that: temperature signal amplifier and pressure signal amplifier are made of measuring operational amplifier U4, U5, filter capacitor C8, C11 and variable resistor R6, R7.
According to described intelligent pressure sensor, it is characterized in that: measure wave filter and constitute by filter capacitor C12, C13, C15, R8 and inductance L 3.
According to described intelligent pressure sensor, it is characterized in that: integrated regulator is made of integrated regulator U6 and filter capacitor C10.
According to described intelligent pressure sensor, it is characterized in that: transceiver is made of integrated circuit U1, diode D1, resistance R 1, R2 and filter capacitor C1, C2; Resistance R 2 and filter capacitor C2 constitute the wake-up circuit that powers on, and diode D1 and resistance R 1 constitute the load of receiving and transmitting signal line LIN, and voltage rising edge and negative edge in the filter capacitor C1 control communication process reduce electromagnetic radiation and the interference that causes.
According to described intelligent pressure sensor; it is characterized in that: the power filter protector is made of protection diode D2, inductance L 2 and filter capacitor C9, C14; inductance L 2 and filter capacitor C9, C14 form L type filtering circuit, and protection diode D2 adopts schottky diode.
According to described intelligent pressure sensor, it is characterized in that: external interface is made up of input power cord, receiving and transmitting signal line LIN and ground wire.
According to described intelligent pressure sensor, it is characterized in that: accurate bias generator is made of integrated circuit U3, current-limiting resistance R5 and filter capacitor C3.
According to described intelligent pressure sensor, it is characterized in that: described measuring bridge is serviceability temperature measuring bridge PT1000 and pressure survey electric bridge P1 simultaneously.
The utility model is compared with conventional pressure sensor has following remarkable advantage:
1, adopts the accurate platinum resistor temperature measuring sensor of integrated pressure sensor and PT1000, measuring accuracy height.
2, utilize one-chip computer that simulating signal is carried out digitizing, the digital processing function that one-chip computer provides can be eliminated various main interference.
3, behind the employing one-chip computer, can realize fault detect, also can realize figure adjustment sensor to sensing system.
4, adopt strong anti-interference ability digital signal transmission circuit, it can receive the instruction that external interface sends, and sends provisioning information according to command request to external interface.
5, adopt a kind of novel bus interface, use the carrier of three leads, can improve sensor reliability greatly as the sensor power supply and the information of transmission.
6, utilize the present invention maximum 16 sensors can be formed a LAN, realize that under network management multi-sensor data merges.
7, use independently ground wire, prevent the loose contact of storage battery ground wire, motor open and stop, dynamo governor damages the impact to sensor of the instantaneous pressure that causes.
8, adopt measuring operational amplifier, can effectively suppress the common mode interference in the measuring process.
9, adopt the data fusion technology on one-chip computer software, revise the measured value of pressure transducer, compensation is because the pressure measurement errors that temperature variation causes.
Description of drawings
Fig. 1 is a schematic block circuit diagram of the present utility model.
Fig. 2 is circuit theory diagrams of the present utility model.
Fig. 3 is a scm software process flow diagram of the present utility model.
Embodiment
Further specify content of the present utility model below in conjunction with accompanying drawing.
Schematic block circuit diagram of the present utility model comprises as shown in Figure 1: one-chip computer, temperature sensor, pressure transducer, temperature signal amplifier, pressure signal amplifier, accurate bias generator, measurement wave filter, integrated regulator, transceiver, power filter protector and external interface.
The utility model is after intelligent pressure sensor adds the 12V power supply by external interface, behind the power filter protector, put on integrated regulator and the transceiver, under this direct supply effect, the work of transceiver wake-up circuit makes transceiver be in ready state; The stable 5V voltage of integrated regulator output provides working power for one-chip computer and measurement wave filter, and the internal reset circuit working of one-chip computer makes it be in ready state; The voltage of measuring wave filter output provides power supply for temperature signal amplifier, pressure signal amplifier, accurate bias generator and one-chip computer internal simulation/digital quantizer, pressure survey electric bridge P1 is transformed to outside liquid pressure the voltage signal that is directly proportional with pressure, temperature survey electric bridge PT1000 is transformed to the voltage signal that is directly proportional with it with the environment temperature of pressure survey electric bridge P1, after two kinds of voltage signals pass through pressure signal amplifier and the amplification of temperature signal amplifier, output to the analog/digital conversion input end of one-chip computer.
Send the instruction of a regulation to transceiver by external interface; The instruction of transceiver response input is converted to the instruction that one-chip computer can be accepted with input instruction, by with the interface circuit of one-chip computer, this instruction is sent to one-chip computer; One-chip computer receives this instruction, requirement according to instruction, start A/D conversion circuit, the voltage signal of pressure signal amplifier and the output of temperature signal amplifier is converted to binary digital signal, and be stored in the internal storage of one-chip computer, one-chip computer is handled the data of gathering according to instruction, relation according to integrated pressure sensor output voltage and environment temperature, with temperature data pressure data is proofreaied and correct, obtain the true pressure data, and the interface circuit that will count by one-chip computer and transceiver sends to transceiver; Transceiver carries out level conversion with it after receiving the data that one-chip computer sends here, sends on the external interface then.
Utilize intelligent pressure sensor can receive the characteristics of external command, can carry out the numeral addressing to sensor, couple together with the external interface of three leads (being called bus), constitute a sensor network a plurality of intelligent pressure sensors (or other sensor of same structure); Provide power supply by three leads for all intelligent pressure sensors, the instruction of reading intelligent pressure sensor contains addressing information, have only just response instruction of the instruction addressing information sensor identical with intelligent pressure sensor addressing information, other sensor still is in ready state.Owing to the restriction of transceiver driving force, on a sensor network, can connect the intelligent voltage sensor of 16 same structures at most.
Circuit theory diagrams of the present utility model as shown in Figure 2.
One-chip computer is made up of one-chip computer integrated circuit U2, filter capacitor C4, C5, C6, C7, inductance L 1 and resistance R 3, R4, the constant voltage dc source that integrated regulator is sent here is through signal wire VCC, after passing through filtering capacitor C 4, C5 filtering again, be added on the power input VCC pin of one-chip computer; 3 GND pins of one-chip computer connect power ground by two, and another connects the ground wire of measuring wave filter; The low-pass filter that inductance L 1 and filter capacitor C6 constitute after measuring the further filtering of DC voltage VCC1 of wave filter output, is received the power input AVCC pin of one-chip computer analog/digital converter; Filter capacitor C7 is the external filter capacitor in the internal reference source of one-chip computer analog/digital converter; The signal of pressure signal amplifier and the output of temperature signal amplifier, link to each other with PC0 with one-chip computer analog/digital converter input pin PC1 with signal wire OUT1 through signal wire OUT2, it can be binary digit with this road analog signal conversion just that one-chip computer starts analog/digital converter; One-chip computer PB0 pin receives the instruction that transceiver integrated circuit U1 sends by signal wire RXD, the instruction of being sent to one-chip computer by signal wire RXD also is connected on the PD2 pin of one-chip computer integrated circuit U2, this pin is the external interrupt pin of one-chip computer, utilizes external interrupt can improve the speed of one-chip computer response input instruction; One-chip computer PB1 pin sends data by signal wire TXD to transceiver; One-chip computer PB3 pin makes it enter low power consumpting state by signal wire SLP may command transceiver; Resistance R 3, R4 are pull-up resistor, for signal wire RXD and signal wire TXD provide DC channel.
The pressure signal amplifier is made up of measuring operational amplifier U5, resistance R 7 and filter capacitor C11, after measuring DC voltage process filtering capacitor C 11 filtering of wave filter output, put on the power pins of measuring operational amplifier U5, the negative supply pin VEE of measuring operational amplifier U5 is connected with the ground wire of measuring wave filter; The voltage signal of pressure survey electric bridge input is added on the input end of measuring operational amplifier U5 by signal wire IN2+ and signal wire IN2-, adjust enlargement factor by regulating variable resistor R7, make the output amplitude of amplifier satisfy measurement requirement, output signal is connected to one-chip computer analog/digital converter input end PC1 through signal wire OUT2.
The temperature signal amplifier is made up of measuring operational amplifier U4, resistance R 6 and filter capacitor C8, after measuring DC voltage process capacitor C 8 filtering of wave filter output, put on the power pins of measuring operational amplifier U4, the negative supply pin VEE of measuring operational amplifier U4 is connected with the ground wire of measuring wave filter; The voltage signal of temperature survey electric bridge PT1000 input is added on the measuring operational amplifier input end by signal wire IN1+ and IN1-, adjust enlargement factor by regulating variable resistor R6, make the output amplitude of amplifier satisfy measurement requirement, output signal is connected to one-chip computer analog/digital converter input end PC0 through signal wire OUT1.
Integrated regulator is made up of integrated regulator U6 and filter capacitor C10; the DC voltage VBAT of power filter protector output puts on integrated regulator U6 pin Vin; the GND pin of integrated regulator U6 links to each other with ground wire; integrated regulator U6+the stable 5V voltage of 5V pin output; after 10 filtering of filtering capacitor C, provide operating voltage for one-chip computer and measurement wave filter by signal wire VCC.
Transceiver circuit is made up of integrated circuit U1, diode D1, resistance R 1, R2, filter capacitor C1, C2, and the DC voltage VBAT that process power filter protector is sent here is applied to the BAT end of integrated circuit U1, and U1 provides working power for integrated circuit; Resistance R 2 and filter capacitor C2 constitute the wake-up circuit that powers on, and are connected with the WAKE pin of integrated circuit U1, make integrated circuit U1 be in ready state after the power supply power supply; Diode D1 and resistance R 1 constitutes the load of receiving and transmitting signal line LIN, and filter capacitor C1 is used for controlling voltage rising edge and the negative edge in the communication process, reduces electromagnetic radiation and the interference that causes; Receiving and transmitting signal line LIN links to each other with external interface, can receive the instruction that external interface is sent here, and also the data that one-chip computer can be sent are delivered to external interface by receiving and transmitting signal line LIN; Signal wire RXD, TXD link to each other with PB2 with PB0, the PB1 of one-chip computer with SLP, the command signal that transceiver is sent external interface receiving and transmitting signal line LIN here is converted to the signal that one-chip computer receives, send one-chip computer command reception end PB0 and external interrupt receiving end PD2 to by signal wire RXD, the data that one-chip computer sends are given transceiver by signal wire TXD, transceiver is converted to data-signal and is fit to the signal that external interface transmits, and sends on the external interface by receiving and transmitting signal line LIN.
The power filter protector is made of protection diode D2, inductance L 2 and filter capacitor C9, C14, external interface+the 12V power lead puts on the L type filtering circuit that inductance L 2 and filter capacitor C9, C14 form through overprotection diode D2; Protection diode D2 adopts schottky diode, if the external interface power supply connects instead, protection diode D2 is in cut-off state, and the protection intelligent pressure sensor avoids damaging, and protection diode D2 has only very little pressure drop under the normal condition; External voltage through inductance L 2, filter capacitor C9, C14 filtering is delivered to transceiver and integrated regulator by signal wire VBAT.
External interface is the joint of one three core, is respectively+the 12V power lead, receiving and transmitting signal line LIN and ground wire, utilizes this interface can read pressure data, also can calibrate or carries out system failure detection intelligent pressure sensor.
Measuring wave filter is made up of filter capacitor C12, C13, C15, resistance R 8 and inductance L 3, after the DC voltage of integrated regulator output is measured filter filtering through this, for measuring amplifier, accurate bias generator and one-chip computer analog/digital converter provide the high stable operating voltage.
Accurate bias generator is made up of integrated circuit U3, current-limiting resistance R5 and filter capacitor C3, the operating voltage of measuring wave filter output acts on integrated circuit U3 by current-limiting resistance R5, Zener breakdown takes place at 2.048 volts in integrated circuit U3, because the effect of current-limiting resistance R5, the output voltage stabilization that makes integrated circuit U3 is at 2.048 volts, capacitor C 3 is a filter capacitor, and 2.048 volts of accurate voltages provide direct current biasing for measuring bridge.
Claims (10)
1, a kind of intelligent pressure sensor is characterized in that: comprise one-chip computer, temperature sensor, pressure transducer, temperature signal amplifier, pressure signal amplifier, accurate bias generator, measure wave filter, integrated regulator, transceiver, power filter protector and external interface; One-chip computer is accepted from the external interface and the instruction of sending by transceiver, requirement according to instruction, from temperature signal amplifier and pressure signal amplifier reading of data or carry out system failure detection, the data of measuring are temporary in the single-chip microcomputer internal register, after the process one-chip computer is handled and proofreaied and correct data, send on the external interface by transceiver; Temperature sensor and pressure transducer are made of measuring bridge, and its bias voltage is that accurate bias generator provides, to ensure the measuring accuracy of sensor; Temperature signal amplifier and pressure signal amplifier are regulated enlargement factor; Measure the power supply further filtering of wave filter, for the analog/digital converter of measuring operational amplifier, accurate bias generator and one-chip computer provides the galvanic current source with integrated regulator output; Integrated regulator provides stable dc supply for one-chip computer, measurement wave filter; Transceiver is after system powers on, wake-up circuit is ready transceiver, the instruction that external interface sends is converted to the digital command that one-chip computer is accepted by transceiver, and is that one-chip computer is performed, and the result of execution sends to external interface by one-chip computer by transceiver; The power filter protector prevents the power supply reversal connection, and the filtering external interference signals is imported power supply stably for integrated regulator and transceiver provide; External interface provides the energy for intelligence sensor and finishes the input of instruction and the output function of data.
2, intelligent pressure sensor according to claim 1 is characterized in that: one-chip computer is made of one-chip computer integrated circuit U2, pull-up resistor R3, R4, filter capacitor C4, C5, C6, C7 and inductance L 1.
3, intelligent pressure sensor according to claim 1 is characterized in that: temperature signal amplifier and pressure signal amplifier are made of measuring operational amplifier U4, U5, filter capacitor C8, C11 and variable resistor R6, R7.
4, intelligent pressure sensor according to claim 1 is characterized in that: measure wave filter and be made of filter capacitor C12, C13, C15, R8 and inductance L 3.
5, intelligent pressure sensor according to claim 1 is characterized in that: integrated regulator is made of integrated regulator U6 and filter capacitor C10.
6, intelligent pressure sensor according to claim 1 is characterized in that: transceiver is made of integrated circuit U1, diode D1, resistance R 1, R2 and filter capacitor C1, C2; Resistance R 2 and filter capacitor C2 constitute the wake-up circuit that powers on, and diode D1 and resistance R 1 constitute the load of receiving and transmitting signal line LIN, and voltage rising edge and negative edge in the filter capacitor C1 control communication process reduce electromagnetic radiation and the interference that causes.
7, intelligent pressure sensor according to claim 1; it is characterized in that: the power filter protector is made of protection diode D2, inductance L 2 and filter capacitor C9, C14; inductance L 2 and filter capacitor C9, C14 form L type filtering circuit, and protection diode D2 adopts schottky diode.
8, intelligent pressure sensor according to claim 1 is characterized in that: external interface is made up of input power cord, receiving and transmitting signal line LIN and ground wire.
9, intelligent pressure sensor according to claim 1 is characterized in that: accurate bias generator is made of integrated circuit U3, current-limiting resistance R5 and filter capacitor C3.
10, intelligent pressure sensor according to claim 1 is characterized in that: described measuring bridge is serviceability temperature measuring bridge PT1000 and pressure survey electric bridge P1 simultaneously.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200520083682 CN2804830Y (en) | 2005-05-30 | 2005-05-30 | Intelligent pressure sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200520083682 CN2804830Y (en) | 2005-05-30 | 2005-05-30 | Intelligent pressure sensor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2804830Y true CN2804830Y (en) | 2006-08-09 |
Family
ID=36910119
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200520083682 Expired - Fee Related CN2804830Y (en) | 2005-05-30 | 2005-05-30 | Intelligent pressure sensor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2804830Y (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101876832A (en) * | 2009-04-27 | 2010-11-03 | 通用汽车环球科技运作公司 | Be integrated with the fluid pressure control device of pressure transducer |
| CN102519666A (en) * | 2011-12-29 | 2012-06-27 | 中国燃气涡轮研究院 | Digital temperature compensation system and method |
| CN104204757A (en) * | 2012-03-28 | 2014-12-10 | 罗伯特·博世有限公司 | Sensor for detecting a pressure and a temperature of a fluid medium |
| CN104390738A (en) * | 2014-12-16 | 2015-03-04 | 济南优耐特汽车电子有限公司 | Oil pressure sensor circuit |
| CN105403351A (en) * | 2015-12-16 | 2016-03-16 | 宿州中矿三杰科技有限公司 | Digital display oil pressure sensor |
| CN110146215A (en) * | 2019-05-19 | 2019-08-20 | 瑞立集团瑞安汽车零部件有限公司 | A kind of baroceptor with temperature-compensating Yu parameter tuning measure |
| CN113340516A (en) * | 2021-06-07 | 2021-09-03 | 中国工程物理研究院总体工程研究所 | Pressure measuring cell |
-
2005
- 2005-05-30 CN CN 200520083682 patent/CN2804830Y/en not_active Expired - Fee Related
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101876832A (en) * | 2009-04-27 | 2010-11-03 | 通用汽车环球科技运作公司 | Be integrated with the fluid pressure control device of pressure transducer |
| US8408516B2 (en) | 2009-04-27 | 2013-04-02 | GM Global Technology Operations LLC | Fluid pressure control device with integrated pressure sensor |
| CN102519666A (en) * | 2011-12-29 | 2012-06-27 | 中国燃气涡轮研究院 | Digital temperature compensation system and method |
| CN104204757A (en) * | 2012-03-28 | 2014-12-10 | 罗伯特·博世有限公司 | Sensor for detecting a pressure and a temperature of a fluid medium |
| CN104204757B (en) * | 2012-03-28 | 2017-05-10 | 罗伯特·博世有限公司 | Sensor for detecting a pressure and a temperature of a fluid medium |
| CN104390738A (en) * | 2014-12-16 | 2015-03-04 | 济南优耐特汽车电子有限公司 | Oil pressure sensor circuit |
| CN105403351A (en) * | 2015-12-16 | 2016-03-16 | 宿州中矿三杰科技有限公司 | Digital display oil pressure sensor |
| CN110146215A (en) * | 2019-05-19 | 2019-08-20 | 瑞立集团瑞安汽车零部件有限公司 | A kind of baroceptor with temperature-compensating Yu parameter tuning measure |
| CN110146215B (en) * | 2019-05-19 | 2021-02-26 | 瑞立集团瑞安汽车零部件有限公司 | Air pressure sensor with temperature compensation and parameter setting measures |
| CN113340516A (en) * | 2021-06-07 | 2021-09-03 | 中国工程物理研究院总体工程研究所 | Pressure measuring cell |
| CN113340516B (en) * | 2021-06-07 | 2023-03-17 | 中国工程物理研究院总体工程研究所 | Pressure measuring cell |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN2804830Y (en) | Intelligent pressure sensor | |
| CN1260550C (en) | Device for detecting physical volume | |
| CA2726534C (en) | Rf adapter for field device with loop current bypass | |
| JP2004523958A (en) | Integrated memory map controller circuit for fiber optic transceiver | |
| CN101443828B (en) | Current interface with a blocking capacitor attached to an additional pin | |
| CN1241259A (en) | Instrument for measuring voltages of cells | |
| CN210071183U (en) | Analog signal transmitter of force sensor | |
| CN216432964U (en) | Multi-point inclinometer | |
| CN2784937Y (en) | Intelligent voltage sensor | |
| CN102162740B (en) | Transmitter | |
| CN207163548U (en) | A kind of faint strain bridge signal transmitting device of two-wire system | |
| CN2786580Y (en) | Intelligent temperature sensor | |
| US20060265159A1 (en) | Offset Compensated Position Sensor and Method | |
| CN110161360A (en) | A kind of incremental encoder broken wire detection system and method | |
| CN2759059Y (en) | Wheel speed signal sensor | |
| CN1142439C (en) | Electric current sensor with wide passband | |
| CN201163198Y (en) | Sensor interface module | |
| CN2527988Y (en) | Temp. vibrating digifax composite sensor | |
| CN1202418C (en) | Current detecting circuit for A/F sensors | |
| CN109688037B (en) | M-Bus master station circuit | |
| US7191078B2 (en) | Offset compensated position sensor and method | |
| CN114414842B (en) | Circuit capable of being used for static acceleration measurement and measuring device | |
| CN111726098B (en) | Signal transmitting device of load sensor | |
| CN100406852C (en) | Multi-signal processing circuit, compund sensor and following detector thereof | |
| CN218994552U (en) | Temperature transmitter |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |