Method and apparatus for dynamic measurement using vibrating wire sensor

Abstract

The invention relates to a vibrating wire transducer-based dynamic measurement method and device. The method comprises the steps of generating an excitation signal to excite a vibrating wire transducer within a predetermined period of time; during the excitation-stopping period of the time, acquiring a sensing signal corresponding to the vibration signal of the vibrating wire transducer; amplifying the sensing signal; conducting the analog-digital conversion on the amplified sensing signal to obtain a discrete signal R(n); conducting the Hilbert transformation on the discrete signal R(n) and calculating the phase angle delta theta n of the Hilbert transformation result X(n); and obtaining the instantaneous frequency fn=delta theta n fs / (2 pi) of a to-be-tested signal according to the sampling frequency fs of the analog-to-digital conversion and the phase angle delta theta n, wherein n is an integer. The invention also provides a device for conducting the above method. According to the technical scheme of the invention, on the premise that the measurement accuracy is ensured, the measurement time resolution is greatly improved compared with that of the conventional method. Therefore, the method and the device are better adapted to the dynamic measurement.

Description

technical field [0001] The invention relates to a vibrating wire sensor, in particular to a method and a device for dynamic measurement using the vibrating wire sensor. Background technique [0002] The vibrating wire sensor is a resonant sensor with a tensioned metal string as the sensitive element, and it is widely used. This kind of sensor can convert various physical quantities such as displacement, tension, pressure, and stress into the tension of the vibrating wire through a certain mechanical structure conversion. When the length of a string is fixed, changes in its natural frequency of vibration reflect changes in its tension. Through the corresponding measurement circuit, the tension of the vibrating wire can be converted into an electrical frequency signal for measurement, thereby realizing the measurement of various physical quantities. [0003] In the traditional vibrating wire sensor measurement method, the converted electrical signal is collected, and then di...

AI Technical Summary

Problems solved by technology

In this case, the traditional vibrating wire sensor measurement method cannot be used, and other sensors can only be used, such as grating fiber optic sensors, resistive sensors, etc.

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