Equal-precision measuring method used for differential pressure transducer

A technology of a differential pressure sensor and a measurement method, which is applied in the direction of measuring devices, measuring fluid pressure, instruments, etc., can solve problems such as low accuracy, complex circuit structure, and low sensitivity, and achieve high-precision testing, high capacitance value accuracy, and use good effect

Inactive Publication Date: 2014-08-13
FUZHOU UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Since the capacitance of the differential pressure sensor is very small, the capacitance change is even smaller (about 5% of the total range), and the above differential pressure sensor measurement methods have low accuracy, low sensitivity, and complex circuit structure. shortcoming

Method used

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  • Equal-precision measuring method used for differential pressure transducer
  • Equal-precision measuring method used for differential pressure transducer
  • Equal-precision measuring method used for differential pressure transducer

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Embodiment Construction

[0020] The technical solution of the present invention will be specifically described below in conjunction with the accompanying drawings.

[0021] The present invention is a kind of equal precision measurement method for differential pressure sensor, comprises the following steps,

[0022] Step S01: Design a differential pressure sensor test circuit according to the equal-precision capacitance frequency measurement method;

[0023] Step S02: Count the capacitor charging time of the differential pressure sensor through the differential pressure sensor test circuit, and the specific implementation process is as follows:

[0024] Count the charging time of the capacitor C1 and the capacitor C2 of the differential pressure sensor respectively by using the capacitance frequency measurement method with equal precision, and obtain the first count value T1 and the second count value T2;

[0025] Step S03: Calculate the output capacitance value of the differential pressure sensor acc...

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Abstract

The invention relates to the technical field of signal processing and applying of differential pressure transducers, in particular to an equal-precision measuring method used for the differential pressure transducer. The equal-precision capacitance frequency measuring method is adopted for counting capacitor charge time; according to the principle that charge time varies from capacitance values to capacitance values, a counting value in direct proportion to a differential pressure transducer capacitor can be obtained, T is calculated through a micro-processor, and therefore an output capacitance value of the differential pressure transducer is obtained. In the method, an FPGA chip is adopted as a core circuit, a circuit signal control function module, a counter function module, a standard signal input function module and the like are achieved, and high-precision testing of the output capacitance value of the differential pressure transducer is achieved.

Description

technical field [0001] The invention relates to the technical field of signal processing and application of differential pressure sensors, in particular to an equal precision measurement method for differential pressure sensors. Background technique [0002] The capacitive differential pressure transmitter is a kind of transmitter widely used in the industry at present. Its detection element is a differential pressure sensor, and the output signal of the differential pressure sensor is a capacitance value. The entire transmitter has no mechanical transmission and adjustment device, the instrument has simple structure, stable and reliable performance, good vibration resistance and high precision. The output capacitance of the differential pressure sensor is very small, generally on the order of pF. Therefore, in the use of the differential pressure sensor, there is a high requirement for capacitance measurement. At present, there are many measurement methods at home and abro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01L27/00
Inventor 林伟唐崇森吕涛
Owner FUZHOU UNIV
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