Large-dynamic high-precision seismic data collector based on delta-sigma modulation

• Main Authors: GAO SHANGHUA, CHEN YANG, FU GUANGYU, XUE BING, ZHUANG DANNING, ZHU XIAOYI, LI JIANG, LIN ZHAN
• Format: Patent
• Language: English
• Published: 08.10.2014
• Subjects: DETECTING MASSES OR OBJECTS; GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; MEASURING; PHYSICS; TESTING

The utility model provides a large-dynamic high-precision seismic data collector based on delta-sigma modulation. The seismic data collector comprises a pre-amplifier, an integrator circuit, an ADC chip, two DAC chips and an FPGA processor. The differential signal output end of the pre-amplifier and the signal output ends of the two DAC chips are connected with the signal input end of the integrator circuit. The signal output end of the integrator circuit is connected with the signal input end of the ADC chip. The signal output end of the ADC chip is connected with the data input end of the FPGA processor. The two paths of data output ends of the FPGA processor are connected with the signal input ends of the two DAC chips respectively. Data that the FPGA processor sends to the two DAC chips is the same in value but opposite in polarity. The data collector can be widely applied to national-level seismic stations; the completeness of the waveform of the collected seismic wave is improved; and the problem of limited range easily occurring to a wide band observation instrument when a violent earthquake is approaching is solved.