Voltage-to-current converter for three-component seismometer and its working method

Abstract

The invention belongs to the field of voltage-current conversion and provides a voltage-current converter used for a three-component seismic wave detector. Wherein, the voltage-to-current converter used for the three-component seismic wave detector includes a constant-current bias current generator, a sensor access detection circuit, a reference constant-voltage source circuit, and a voltage-controlled current source circuit; the constant-current bias current generator The sensor is used to output a constant current and provide a constant current bias for the three-component detector through the sensor access detection circuit; the sensor access detection circuit is also used to output a control signal to control the prohibition or start-up voltage of the voltage-controlled current source circuit For current conversion; the reference constant voltage source circuit is used to provide a reference voltage for the voltage-controlled current source circuit.

Description

technical field [0001] The invention belongs to the field of voltage-current conversion, and in particular relates to a voltage-current converter for a three-component seismic wave detector and a working method thereof. Background technique [0002] The statements in this section merely provide background information related to the present invention and do not necessarily constitute prior art. [0003] Generally, the shock wave signal detected by the three-component seismic wave detector is output in the form of voltage change, and the output drive capability of the geophone is low. When the voltage signal is transmitted over a long distance, the DC internal resistance of the wire increases linearly with the extension of the wire, and the distribution The capacitance and inductance also continue to increase, which causes the amplitude of the remote output signal to attenuate and the phase of the signal to shift. The phase shift of different signal frequency components change...

AI Technical Summary

Problems solved by technology

[0003] Generally, the shock wave signal detected by the three-component seismic wave detector is output in the form of voltage change, and the output drive capability of the geophone is low. When the voltage signal is transmitted over a long distance, the DC internal resistance of the wire increases linearly with the extension of the wire, and the distribution The capacitance and inductance also continue to increase, which causes the amplitude of the remote output signal to attenuate and the phase of the signal to shift. The phase shift of different signal frequency components changes with the frequency, and the amount of change is unstable and random, and even the phase is randomly reversed. and other serious problems; the common-mode signal generated in the signal cable is likely to saturate the input amplifier inside the receiving end, resulting in the loss, distortion, and error of vibration signal information; in the use environment, the electromagnetic radiation generated by various devices around way coupled into the signal transmission cable superimposed on the signal

The inventors found that the above problems make the voltage waveform signal appear to be severely distorted in the time domain, and aliases, random phase shifts, and amplitude changes will also appear in the frequency domain, which will have a significant impact on subsequent application analysis

Although many digital filtering techniques can be used in the post-data processing process to improve the signal, increase the signal-to-noise ratio, filter out most interference signals, and extract the signal for analysis and judgment, it is impossible to remove all kinds of clutter mixed into the signal. , which inevitably interferes with the correct interpretation of the signal

Images