Measurement device and method for differential capacitance type instrument

Abstract

The invention relates to a measurement device and method for a differential capacitance type instrument. The device comprises an alternating excitation signal generator, a circuit option switch circuit, an AD (analog-to-digital) converter and a digital signal processor, wherein after the alternating excitation signal generator generates an alternating excitation signal with fixed frequency and fixed amplitude, the alternating excitation signal is applied to two ends of the differential capacitance type instrument through the circuit option switch circuit to realize positive excitation and negative excitation of the differential capacitance type instrument; the output end of an intermediate polar plate of the differential capacitance type instrument is sequentially connected with the AD converter and the digital signal processor, the spectrum data amplitude maximum value acquired by converting the output signal of the intermediate polar plate of the differential capacitance type instrument in the positive excitation and the negative excitation, a variation of a measured physical quantity of the differential capacitance type instrument is acquired according to a certain linear relationship, so that the differential capacitance type instrument can be measured. According to the measurement device, a high accuracy measurement result can be acquired for the differential capacitance type instrument, so that the reliability of a differential resistance type sensor can be improved.

Description

technical field [0001] The invention relates to the technical field of health monitoring of geotechnical engineering, in particular to a measuring device and method of a differential capacitive instrument in safety monitoring instruments of geotechnical engineering. Background technique [0002] In the field of safety monitoring of geotechnical engineering, the differential capacitive instrument is a relatively unique type of safety monitoring instrument, which is generally used to realize the settlement measurement, vertical line displacement measurement, tension line displacement measurement, dual The monitoring of physical quantities such as metal standard deformation monitoring has many applications in safety monitoring projects. [0003] Differential capacitive instruments generally consist of a pair of paired capacitors with symmetrical parameters (defined as C 1 and C 2 ) As the sensitive element of the sensor, this pair of capacitances has such properties. When the...

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Problems solved by technology

[0006] Aiming at the problem that the existing differential capacitive instruments cannot obtain high-precision and high-reliability measurement results due to the influence of interference factors, the present invention provides a new type of measuring device for differential capacitive instruments, which can effectively Overcome the influence of various disturbances on the measurement results of differential capacitance instruments to ensure that differential capacitance instruments obtain high-precision measurement results

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