Portable high-precision moving-coil geophone performance test device and portable high-precision moving-coil geophone performance test method

Abstract

The invention discloses a portable high-precision moving-coil geophone performance test device and a portable high-precision moving-coil geophone performance test method. The device comprises a hardware conditioning circuit, a multi-channel electronic switch, an ADC, a DAC, an FPGA, a signal generator, a trigger switch and a USB interface. The FPGA sends a signal to control the hardware conditioning circuit and the multi-channel electronic switch and select different signal channels. An excitation signal is applied to the two electrodes of a geophone under test through the hardware conditioning circuit and the multi-channel electronic switch. The output signal of the geophone passes through the two electrodes and is then sent to the ADC via the hardware conditioning circuit and the multi-channel electronic switch, and digitalized data is sent to the FPGA. The FPGA performs calculation on the data to get related parameters of the geophone and sends the parameters to the USB interface. The USB interface can be connected with a memory or connected to a PC or a laptop through a cable. The signal generator sends a signal to the DAC under signal control of the FPGA, and outputs an analog excitation signal to the hardware conditioning circuit and the multi-channel electronic switch. The precision and degree of integration of test are improved, and the portability is increased.

Description

technical field [0001] The invention relates to the technical field of geophysical exploration, seismic exploration and geophone testing, in particular to a portable high-precision moving coil geophone performance testing device and method. Background technique [0002] Seismic exploration is the most important method of geophysical resource exploration. Usually artificial excitation of seismic waves is used, and the reflected waves are detected by geophones, and then digitized, so as to obtain the section map of the geological structure. At present, the sensors used in land seismic exploration are mainly moving-coil electromagnetic induction sensors (moving-coil geophones), and it is estimated that there are tens of millions of them in use in China. Generally, a set of large-scale petroleum seismic exploration equipment usually requires thousands or even tens of thousands of geophones. Among them, the use of underdamped moving coil geophones (its damping coefficient <1...

AI Technical Summary

Problems solved by technology

Although it meets the requirements of field testing, its integration level is not high and its volume is large

Images