光纤水听器灵敏度测试研究

研制了一套简单可行的光纤水听器灵敏度校准装置,提出了一种简便的测量方法——比对法:将标准压电水听器探头和光纤水听器探头置于同一声场中，并将两探头的输出同时接到数字示波器上进行比对测量.研究表明,振动系统中的盛水容器具有一定的壁厚（>10 mm或1/10桶的外径）时，可将振动系统的谐振峰移出工作频段范围（3~1000 Hz）外.利用此装置结合比对法,校准系统简单，校准速度快,实验的误差小于0.5 dB,能满足一般光纤水听器灵敏度的校准需求.

Study on Measuring Sensitivity of Fiber-optic Hydrophone

A set of easy-used calibrating apparatus for fiber-optic hydrophone′s sensitivity was invented,and a convenient measuring method of comparison was proposed.The probes of standard piezoelectric hydrophone and fiber-optic hydrophone were placed in the same sound field ,then the outputs of the two probes were linked to the digital oscilloscope for comparison measure.The research shows that the resonant peak can be removed from the working frequency range which is from 3 ~ 1000 HZ when the wall thickness of the metallic cylinder in the vibrating system is more than 10 mm or 1/10 of the cylinder′s outer diameter.Applying this setting as well as comparison method ,the calibration system is simple and the process of calibration is quick,then the error is less than 0.5 dB,which is in the demand of the calibration for fiber-optic hydrophone′s sensitivity.