Design on Measuring System of New Type Electrical Resistivity Imaging Exploring Ground Instrument

Abstract

Aiming at the deficiencies of single signal of electrical resistivity imaging instrument, poor anti-interference, fixed electrode arrangement and low-sampling accuracy, etc, this paper designs a new type of high-density exploring ground instrument. Based on MCU as controller, the transmitter uses MOSFET tube driving H bridge circuit to transmit any digital code current signal. Based on FPGA as master controller, the receiver uses 24 bit ADC chip to sample the data, designs the key circuit such as reference source, clock and single-ended to differential, accomplishes high precision data acquisition. Distributed intelligent electrode conversion device uses low power relay, so it is very small and low power consumption. We did the noise test and repeated measurement experiments on pure resistance on this instrument. The experimental results show that the transmitting signal is stable, waveform is standard, resistance curve tested by collecting system and actual curve are coherent, the precision is high and the stabilization is good.

Research on Acceleration Data Recovery System Based on the Process of High-Speed Projectile Entering Water Impact

“…The controller block diagram of ADS1256 is shown as Figure 5: [11][12][13][14] The working process of the module is as follows: ADC controller waits for the arrival of the trigger signal when the power is on; when the trigger signal is valid, the controller sets the chip select signal (CS) of channel 2, the timing preparation signal DRDY to low, and starts a collection and conversion process; At the same time the counter starts counting for 20s, and after the technology ends, it enters the next waiting trigger. [14][15][16][17] Figure 5 ADC controller frame…”