A Seismic Data Acquisition System Based on Wireless Network Transmission

Abstract

A seismic data acquisition system based on wireless network transmission is designed to improve the low-frequency response and low sensitivity of the existing acquisition system. The system comprises of a piezoelectric transducer, a high-resolution data acquisition system, and a wireless communication module. A seismic piezoelectric transducer based on a piezoelectric simply supported beam using PMN-PT is proposed. High sensitivity is obtained by using a new piezoelectric material PMN-PT, and a simply supported beam matching with the PMN-PT wafer is designed, which can provide a good low-frequency response. The data acquisition system includes an electronic circuit for charge conversion, filtering, and amplification, an FPGA, and a 24-bit analog-to-digital converter (ADC). The wireless communication was based on the ZigBee modules and the WiFi modules. The experimental results show that the application of the piezoelectric simply supported beam based on PMN-PT can effectively improve the sensitivity of the piezoelectric accelerometer by more than 190%, compared with the traditional PZT material. At low frequencies, the fidelity of the PMN-PT piezoelectric simply supported beam is better than that of a traditional central compressed model, which is an effective expansion of the bandwidth to the low-frequency region. The charge conversion, filtering, amplification, and digitization of the output signal of the piezoelectric transducer are processed and, finally, are wirelessly transmitted to the monitoring centre, achieving the design of a seismic data acquisition system based on wireless transmission.

Design of A High-Precision Component-Type Vertical Pendulum Tiltmeter Based on FPGA

“…The system uses TI (TEXAS INSTRUMENTS) ADS1256 chip for analog-to-digital conversion; ADS1256 is a low-noise 24-bit analog-to-digital converter (ADC), and the maximum sampling rate of 30 Ksps. The ADC can communicate data with the FPGA through an internal SPI interface with an output format of 24-bit complement and a transfer rate of up to 1.5 Mbps [ 19 , 20 ].…”

Design of multi-channel signal acquisition system based on LTC2325

“…With the development of detection technology, higher and higher requirements are put forward for the performance of detection system. [5][6] At present, common data acquisition systems have problems such as poor acquisition accuracy and low acquisition rate [7]. In this paper, LTC2325-14 from Analog Device is used as the main chip of the AD module and Zynq-7020 is used as the signal processing chip.…”

Development of a Sandwiched Piezoelectric Accelerometer for Low-Frequency and Wide-Band Seismic Exploration

“…Seismic exploration plays a pivotal role in assessing subsurface geological structures. In onshore seismic acquisition, primary sensor options include moving-coil velocity geophones [1,2] and piezoelectric accelerometers [3,4]. Notably, the limited sensitivity and constrained dynamic range of moving-coil geophones have led to the preference for piezoelectric accelerometers in modern high-precision land seismic exploration.…”

“…Seismic piezoelectric accelerometers, which primarily rely on seismic mass blockinduced thickness deformation to detect ground motion [4], face a persistent challenge: a constrained bandwidth for low-frequency signals. While accelerometers employing a cantilever beam and a sizable mass in bending mode offer advantageous low-frequency responsiveness and high sensitivity [14][15][16][17], they also maintain a restricted bandwidth.…”