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| 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 |
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Abstract 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.
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Received: 24 August 2021
Published: 03 January 2023
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Corresponding Authors:
CHEN Ru-Jun
E-mail: wangff@csu.edu.cn;chen.rujun@foxmail.com
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Schematic diagram of the working principle of the quadrupole method
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SIP tester composition
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Overall design of acquisition card
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Functional Block Diagram of AD7760
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Diagram of AD7760 and FPGA pin connection
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Schematic diagram of self-check circuit
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Structure diagram of main modules in FPGA
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Power module division
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The photo of the acquisition card
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Four-channel short-circuit noise curve
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The short-circuit input noise of channel 1 at different sampling rates
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| 测试频点 | 串联1 GΩ电阻 | 串联10 GΩ电阻 | 未串联电阻 | | 输入电压 | 输出电压 | 输入电压 | 输出电压 | 输入电压 | 输出电压 | | 10 Hz | 1.01 | 1.01 | 1.01 | 1.01 | 1.01 | 1.01 | | 100 Hz | 1.01 | 1.01 | 1.01 | 1.01 | 1.01 | 1.01 | | 1 kHz | 1.01 | 1.01 | 1.01 | 1.01 | 1.01 | 1.01 | | 10 kHz | 1.03 | 1.03 | 1.03 | 1.03 | 1.03 | 1.03 | | 100 kHz | 1.04 | 1.03 | 1.04 | 1.03 | 1.03 | 1.03 | | 200 kHz | 1.04 | 1.01 | 1.04 | 1.01 | 1.04 | 1.01 | | 400 kHz | 1.04 | 0.883 | 1.04 | 0.884 | 1.04 | 0.883 | | 600 kHz | 1.04 | 0.673 | 1.04 | 0.674 | 1.04 | 0.673 | | 800 kHz | 1.04 | 0.543 | 1.04 | 0.545 | 1.04 | 0.542 | | 1 MHz | 1.04 | 0.468 | 1.05 | 0.470 | 1.04 | 0.467 |
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Input impedance test resultsV
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Resistor model
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Test result of the prototype and LCR bridge
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| 标本编号 | 类型 | 长/cm | 宽/cm | 高/cm | | 02-6 | 大理岩 | 4.4 | 3.6 | 6.5 | | 4000-19 | 铅锌矿 | 3.7 | 3.7 | 4.0 |
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Parameter table of rock and ore specimens
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Photos of rock and ore specimens
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Measurement results of rock and ore specimens
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