水声管中传感器灵敏度标定的新方法

New method for the sensors sensitivity calibration in water-filled tube

对声管双传感器传递函数法测量中由传感器灵敏度差异带来的误差进行了分析.根据已知确定界面反射系数可确定传感器传递函数,并可求其灵敏度比的原理提出了声管中双传感器灵敏度标定的新方法.空气声管中对刚背衬下已知传递函数进行了实验验证;水声管中气体背衬时,分别在常压和打压情况下对新方法进行了实验验证,说明了新方法的可靠性,克服了水声管中无法用交换传感器获得灵敏度补偿的困难.

The error brought up by the sensitivity difference of sensors was analyzed in the transfer function measurement using two-sensor method in acoustic tube. Based on the transfer function found from the known reflectance of known interface the ration of sensors sensitivities could be measured, a new method for sensors sensitivity calibration in acoustic tube was brought forward. An experimental validation of the known transfer function was carried out in air-filled tube with rigid terminator by exchanging the microphones in the acoustic tube. In water-filled tube with air terminator the experimental validations of the new method were carried out in the condition with environment pressure and higher pressure, it illustrates the validity of the new method, which overcomes the difficulty of exchanging hydrophone in water tube.