20 Hz~10 kHz光纤水听器相移灵敏度校准

利用相位生成载波解调技术精确测量光纤水听器的光相移量,在20 Hz~10 kHz频率范围实现了光纤水听器探头相移灵敏度的校准.20 Hz~1.25 kHz频段采用驻波管比较法进行校准,1.25 kHz~10 kHz频段采用自由场脉冲比较法进行校准.利用本文建立的校准系统,对TMD 35#光纤水听器的相移灵敏度进行校准,校准结果表明,两种方法测得的相移灵敏度具有很好的一致性,在1.25 kHz频率点的相移灵敏度值偏差为0.8 dB.不确定度分析表明,该校准系统的扩展不确定度(k=2)为0.9 dB.

Calibration of Phase-shifted Sensitivity of Optical Fiber Hydrophone in the Frequency Range 20 Hz to 10 kHz

Through accurately measuring the phase-shifted sensitivity of the head of optical fiber hydrophone using phased generated carrier demodulation technique, calibration of phase-shifted sensitivity of optical fiber hydrophone in the frequency range 20 Hz to 10 kHz was realized. At the frequencies from 20 Hz to 1.25 kHz, the calibration method was standing wave tube comparison method. And at the frequencies from 1.25 kHz to 10 kHz, the calibration method was free-field tone-burst comparison method. The No.35 TMD optical fiber hydrophone was calibrated by the calibration system. The calibration results show that the phased-shifted sensitivities measured by two methods are very close, and the deviation value of sensitivity at the frequency 1.25 kHz is only 0.8 dB. Analysis of measurement uncertainties prove that the expand uncertainty (at k=2) of this calibration system is 0.9 dB.