高静水压下自由场水声声压标准装置的研究

The Development of Free-field Underwater Acoustic Pressure Standard at High Hydrostatic Pressure

为了精确测量高静水压下自由场中的水声信号,在高压消声水池系统基础上建立了高静水压下自由场水声声压标准装置。装置由水声信号发射系统、电声信号测量系统、控制和管理系统及互易测量构件设备所组成,能够在2～200 kHz频率范围内,0.1～10 MPa静水压力下用球面波互易校准原理校准标准水听器的自由场灵敏度,校准值的扩展不确定度为0.8 dB（P=95%）。

In order to measure the underwater acoustic pressure in the free-field at high hydrostatic pressure accurately, a free-field underwater acoustic pressure standard is established on the basis of the anechoic hydrostatic pressure vessel system. This standard consists of underwater sound transmitting system, electro-acoustic signal measurement system, digital control system and reciprocal measurement device. It can calibrate the free-field sensitivity of the standard hydrophone in the frequency range of 2 kHz to 200 kHz and hydrostatic pressure range of 0.1 MPa to 10 MPa by use of the spherical wave reciprocal calibration method, and the expanded uncertainty of the calibrated value is 0. 8 dB（ P = 95 % ）.