Development of the acquisition system of a broadband spectral induced polarization testers for rock and ore samples
WANG Fei-Fei1,2(), CHEN Ru-Jun1,2,3,4(), LI Sheng-Jie1,2, SHEN Rui-Jie1,2, YIN Hao1,2, LIU Feng-Hai1,2, PENG Xin1,2
1. School of Geosciences and Info-physics, Central South University, Changsha 410083, China 2. AIoT Innovation and Entrepreneurship Education Center for Geology and Geophysics, Central South University, Changsha 410083, China 3. Hunan Key Laboratory of Nonferrous Resources and Geological Disaster Exploration, Changsha, 410083, China 4. Key Laboratory of Metallogenic Prediction of Nonferrous Metals and Geological Environment Monitoring, Ministry of Education, Changsha 410083, China
The acquisition system is a very important part of a broadband spectral induced polarization (SIP) tester for rock and ore samples. Its performance directly determines the precision, power consumption, sampling rate, and signal-to-noise ratio of the tester. Therefore, it is a focus and challenge throughout the development of a tester to design an acquisition system with high input impedance, a high sampling rate, high precision, low noise, and low power consumption. Based on the principle of the quadrupole method, this study designed an acquisition system of a SIP tester that integrates four acquisition channels. The acquisition system uses the 24-bit ADC chip AD7760 to realize A/D conversion, uses the AD9837 chip to generate sine waveforms for self-check of the tester, and uses the FPGA chip of the model XC6SLX25 to control the acquisition system. The test results of the system are as follow. The acquisition system has input impedance greater than 1 TΩ, survey precision of 0.4%, a sampling rate of up to 2.5 MHz, and a bandwidth of 1~200 kHz. Each sampling channel of the acquisition system has short-circuit noise less than 1 mV and supports 1/5/25/125 times adjustable gain. The voltage and current of the signal source can be switched among 1 mV, 10 mV, 100 mV, 1 V, and 10 V and 1 μA, 10 μA, 100 μA, 1 mA, and 10 mA, respectively. The hardware acquisition system developed in this study can meet the needs for broadband SIP tests of rock and ore samples.
王飞飞, 陈儒军, 李生杰, 申瑞杰, 殷昊, 刘峰海, 彭鑫. 宽带岩矿石标本频谱激电测试仪采集系统研制[J]. 物探与化探, 2022, 46(6): 1454-1462.
WANG Fei-Fei, CHEN Ru-Jun, LI Sheng-Jie, SHEN Rui-Jie, YIN Hao, LIU Feng-Hai, PENG Xin. Development of the acquisition system of a broadband spectral induced polarization testers for rock and ore samples. Geophysical and Geochemical Exploration, 2022, 46(6): 1454-1462.
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