Digital pressure gauge

A digital pressure gauge and pressure sensor technology, applied in the direction of measuring force, fluid pressure measurement by changing ohmic resistance, measuring device, etc., can solve the problems of inability to accurately measure temperature, difficult to transplant to low power consumption, and large amount of calculation. , to achieve the effect of significant compensation effect, simple and reasonable structure, and low power consumption of the whole machine

Active Publication Date: 2011-01-05
SICHUAN SHUGU INSTR TECH
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Problems solved by technology

However, the chip PGA309 itself needs to use a temperature sensor to measure the temperature, and it is also unable to accurately measure the temperature of the pressure sensitive element in the pressure sensor.
[0006] In the Chinese invention patent "Nonlinear Hysteresis Intelligent Compensation Method and Intelligent Compensation System f

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Embodiment Construction

[0031] The objective of the present invention is to design a new type of digital pressure gauge that can accurately measure the true working temperature of the sensitive element in the piezoresistive sensor, thereby performing more accurate temperature compensation, and at the same time having a simple and efficient temperature compensation method And nonlinear compensation method, and use low-power microprocessor to realize the compensation method.

[0032] Refer to below figure 1 , figure 2 with image 3 The present invention will be described in detail, especially the temperature detection circuit can accurately measure the temperature of the pressure sensitive element. figure 1 It is a block diagram of the circuit principle of the present invention, which provides a digital pressure gauge. The digital pressure gauge includes: piezoresistive pressure sensor 1, signal processing circuit 4, A / D conversion circuit I 5, temperature measurement circuit 2, A / D conversion circuit I...

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Abstract

The invention discloses a digital pressure gauge, which is characterized in that the digital pressure gauge comprises a piezoresistive pressure transducer, a temperature detection circuit, two A/D conversion circuits and a microprocessor. On one hand, the microprocessor carries out sampling by the A/D conversion circuit I so as to obtain a voltage value corresponding to a current pressure signal; on the other hand, the microprocessor carries out sampling by the A/D conversion circuit II so as to obtain an output voltage value of the temperature detection circuit, and accurately calculates the temperature of the piezoresistive pressure transducer, then modifies the obtained values according to a temperature compensation method and a nonlinear compensation method so as to calculate more accurate pressure value, and finally, transmits digital signals by a communication module. The temperature detection circuit of the invention can accurately detect the temperatures of pressure sensitive components in the piezoresistive pressure transducer, thereby carrying out more accurate temperature compensation.

Description

Technical field [0001] The invention relates to a pressure measuring system, which is suitable for all products using piezoresistive pressure sensitive elements as sensors, especially pressure gauges, pressure transmitters and other products using piezoresistive sensors. Background technique [0002] Piezoresistive pressure sensor is an important sensor for measuring pressure at present. It is widely used in industrial control, automotive electronics, aerospace and other fields. It is made by using the piezoresistive effect of semiconductor materials and microelectronics technology, and has a sensitivity coefficient. Large, high resolution, high frequency response, small size and other characteristics, it is mainly used to measure pressure, acceleration and load and other parameters. Since semiconductor materials are very sensitive to temperature, piezoresistive pressure sensors have obvious temperature effects, and temperature compensation must be performed in actual application...

Claims

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Application Information

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IPC IPC(8): G01L1/22G01L9/04
Inventor 李自强银河
Owner SICHUAN SHUGU INSTR TECH
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