Design of low-power and changeable-frequency underwater data acquisition system

The conception and characteristics of underwater blast shock wave and gas bubble pulsation theory are explained in this paper, based on which, the measuring principle and sampling parameters of the overpressure measuring system of underwater blast shock wave are figured out. The underwater blast pressure sensor, A/D converter, trigger control circuit, communication interface circuit, battery and other circuits are packaged in an airtight, water-proof and solid steel shell, which make up of a underwater blast shock wave measuring system working independently. This system has advantages of small size, low power consumption, high sampling frequency, anti-interference and no-need of cable, and is fit for large-scale multi-point measurement in underwater.