Bacon D R
NPL, Teddington.
IEEE Trans Ultrason Ferroelectr Freq Control. 1988;35(2):152-61. doi: 10.1109/58.4165.
A primary calibration method for ultrasonic hydrophones which uses a Michelson interferometer to determine the particle displacement in an ultrasonic field is discussed. The acoustic pressure is derived from this measurement and used to determine the free-field sensitivity of a hydrophone in the frequency range 0.5-15 MHz. The random uncertainty of the method is typically 1%, whereas the systematic uncertainty varies from 2.3 to 6.6% over the frequency range. To obtain this accuracy, the performance of the system has been carefully examined and appropriate correction factors derived. The greatest difficulty in the method lies in determining the frequency response of the optical detection system, and two different approaches have been used to measure this response. Several acoustical effects have also been studied and the calibration procedure modified to take account of them. The calibration results are in agreement with those of other methods and with the theoretically predicted frequency response of a hydrophone. The method has been used to determine the temporal stability of a hydrophone over a period of two years.
讨论了一种用于超声水听器的初级校准方法，该方法使用迈克尔逊干涉仪来确定超声场中的粒子位移。从该测量中导出声压，并用于确定水听器在0.5 - 15 MHz频率范围内的自由场灵敏度。该方法的随机不确定度通常为1%，而系统不确定度在该频率范围内从2.3%变化到6.6%。为了获得这种精度，已仔细检查了系统的性能并导出了适当的校正因子。该方法最大的困难在于确定光学检测系统的频率响应，并且已使用两种不同的方法来测量这种响应。还研究了几种声学效应，并对校准程序进行了修改以考虑这些效应。校准结果与其他方法的结果以及水听器的理论预测频率响应一致。该方法已用于确定水听器在两年时间内的时间稳定性。
