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Digital temperature compensation system and method

A technology of digital temperature compensation and temperature compensation, which is applied in measuring devices, instruments, measuring fluid pressure, etc., can solve the problem of low accuracy

Active Publication Date: 2012-06-27
四川天利科技有限责任公司
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Problems solved by technology

[0003] The purpose of the present invention is: in order to solve the problem of low precision of the traditional digital temperature compensation system, the present invention provides a digital temperature compensation system and method

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  • Digital temperature compensation system and method

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[0041] A digital temperature compensation system, the pressure sensor 2 is a pressure sensor with a range of ±30kPa, and the excitation current required by the selected pressure sensor 2 is 1.5mA. The constant current source 1 of this system is composed of a reference voltage source 10 and an OP400 chip 11, wherein the reference voltage source 10 adopts a MAX6225AESA chip and is connected with the OP400 chip 11 to provide a 2.5V reference voltage for the OP400 chip 11; the OP400 chip 11 is connected to the pressure sensor The module 3 is connected, and the reference voltage is converted into a reference current to provide a 1.5mA excitation current for the pressure sensor module 3 . The current conversion resistance R is 1.6667KΩ. The pressure signal amplifier 5 adopts AD620 to realize the differential output of 1:100. Temperature signal amplifier 8 adopts AD620 to realize 1:1 differential output. Multiplexing switch 9 adopts MAX307 to realize channel selection of temperatur...

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Abstract

The invention belongs to the field of pressure measurement, particularly to a digital temperature compensation system and a method. The temperature compensation system includes a constant-current source (1), a pressure sensing module (3), a pressure signal amplifier (5), a temperature signal amplifier (8), a multiplexing switch (9), an A / D conversion module (6) and a processor (7). The method includes steps including system calibration, storage of system temperature calibration results, and the measurement temperature compensation. According to the invention, in the digital temperature compensation system, a temperature compensation resistor is additionally arranged at a pressure sensor through the design of the pressure sensing module to amplify the temperature characteristic of the pressure sensor and realize the automatic temperature compensation, so that the installation and maintenance are convenient, and the function of serving as the pressure sensor and the temperature sensor at the same time are realized. The digital temperature compensation method provided by the invention realizes the automatic temperature compensation at any temperature and any pressure, has higher measuring accuracy, improves the pressure measuring accuracy, and has the full range error smaller than 0.02% or lager than minus 0.02%.

Description

technical field [0001] The invention belongs to the field of pressure measurement, in particular to a digital temperature compensation system and method. Background technique [0002] For a pressure measurement system, accuracy is a very important indicator. In order to effectively improve the measurement accuracy, there are generally two aspects to consider in terms of temperature compensation: one is the influence of comprehensive temperature drift on the measured value; the other is to compensate the sensor output characteristics. Because sensor materials often have conversion effects, especially most materials have temperature conversion effects, that is, the characteristics of materials change with temperature and so on. The optimized design of the sensor and the improvement of the process technology can only eliminate the limited accuracy error. On the other hand, the gradient characteristic of the optimized pressure sensor with temperature is not very obvious, and i...

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Application Information

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IPC IPC(8): G01L19/04
Inventor 陈洪敏李仙丽
Owner 四川天利科技有限责任公司
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