Quick vibrating-wire sensor frequency measurement device

Abstract

The invention discloses a quick vibrating-wire sensor frequency measurement device, which comprises an improved excitation signal obtaining circuit, an excitation circuit and a signal conditioning circuit. The improved excitation signal obtaining circuit comprises a high-voltage power supply converter, an electronic switch, a voltage stabilization capacitor C1, a current-limiting resistor R1 and an energy-storage capacitor C2. The high-voltage power supply converter is connected in series with the electronic switch and the current-limiting resistor R1 in sequence; one end of the voltage stabilization capacitor C1 is connected between the high-voltage power supply converter and the electronic switch, and the other end of the voltage stabilization capacitor C1 is grounded; and one end of the energy-storage capacitor C2 is connected with one end of the current-limiting resistor R1, and the other end of the energy-storage capacitor C2 is grounded. The charging time of the device is one thousandth of the charging time when the capacitor is charged through an inductive circuit, so that the charging time of the device is far smaller than the charging time when the capacitor is charged through the inductive circuit; and excitation signals of a vibrating-wire sensor during working can be obtained at a faster speed, measuring result can be obtained more quickly, and quick measurement of the frequency of the vibrating-wire sensor is realized.

Description

technical field [0001] The invention belongs to the technical field of electronic information measurement, and relates to a fast measuring device for the frequency of a vibrating wire sensor, in particular to a device capable of quickly acquiring an exciting signal, which is the exciting signal for making the vibrating wire sensor vibrate. Background technique [0002] The vibrating wire sensor is based on the working principle that the natural frequency of the steel wire changes with the change of tension. Its output is a frequency signal, which has the advantages of strong anti-interference ability and is suitable for long-distance transmission. It is used in dams, bridges, subways, coal mines, foundation pits, etc. It has a wide range of applications in engineering safety monitoring. [0003] The working process of the frequency detection of the vibrating wire sensor is generally divided into three steps: (1) Acquisition of the excitation signal: the acquisition of the ex...

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Problems solved by technology

[0004] It can be seen that during the entire frequency measurement process, the acquisition of the excitation signal takes up more than 70% of the entire frequency measurement time ([1000 / (1000+100+250)]*100%=74.1%), making the entire measurement process time shorter long, so how to quickly obtain the high voltage excitation signal becomes the most effective way to reduce the measurement time

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