Frontiers in Signal Processing

Download PDF (1111.4 KB) PP. 16 - 21 Pub. Date: January 5, 2020

DOI: 10.22606/fsp.2020.41003

• Jiaming Zeng
  College of Electrical Information Engineering, Southwest Minzu University, Chengdu, Sichuan, China
• Qiang Xiang^*
  College of Electrical Information Engineering, Southwest Minzu University, Chengdu, Sichuan, China
• Lie Guo
  College of Computer Technology and Engineering, University of Electronic Science and Technology of China, Chengdu, Sichuan, China
• Youan Shi
  China Aerodynamic Research and Development Center, Mianyang, Sichuan, China
• Wei Chang
  China Aerodynamic Research and Development Center, Mianyang, Sichuan, China

Ultrasound time, direct time difference, phase difference, integer-decimal detection, FPGA

Ultrasound measurement technology can be used in nondestructive testing, temperature measurement, ranging and other industrial fields. These technologies all depend on the measurement of ultrasonic wave speed or sound time. At present, the commonly used ultrasonic time measurement methods are direct time difference method and phase difference method, but both of them have certain limitations. In this paper, an algorithm for high precision ultrasonic time measurement is presented. In this algorithm, zynq-7000 FPGA is used as the control core of the system hardware circuit, and the signal generator module is used to generate the ultrasonic signal. The time difference and phase difference between the received and received signals are measured to determine the ultrasonic transit time. The experimental results show that the system can accurately measure the time, the phase resolution is 0.007 degrees, and the time accuracy is better than 1.0ns (nanoseconds).

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