Portable high-precision moving-coil geophone performance test device and portable high-precision moving-coil geophone performance test method
A testing device and geophone technology, applied in instruments, geophysical measurements, etc., can solve the problems of low integration and large volume, and achieve the effects of improving test accuracy, increasing portability, and improving operational stability and integration.
Inactive Publication Date: 2017-01-18
UNIV OF SCI & TECH OF CHINA
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Although it meets the requirements of field testing, it
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[0028] Specific embodiments of the present invention:
[0029] U1 uses a dual analog switch MAX4718 with low crosstalk and high isolation. There is also a signal amplifier OPA211 in U1, which is an ultra-low noise precision amplifier. The ADC uses ADS1282, which is a 32-bit Σ-Δ ADC with higher analog-to-digital conversion accuracy. The DAC uses DAC1280, which is a low-distortion and high-signal-to-noise ratio DAC. U2 uses CS5376, which is a signal generator, which solidifies the standard high-quality signal stream data filter. FPGA chooses 5CEFA7F23I7N for use. The USB driver uses CY7C68013A.
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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...
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Login to view more IPC IPC(8): G01V13/00
CPCG01V13/00
Inventor 宋克柱童声群
Owner UNIV OF SCI & TECH OF CHINA
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