Hydrophone sensitivity absolute calibration device and method

The invention discloses a hydrophone sensitivity absolute calibration device and method, relates to the field of underwater acoustic measurement, and is mainly used for absolute calibration of hydrophone sensitivity. According to the device and the method, a light inlet window is arranged on a cavity body of a coupling cavity, a reflector is arranged outside the cavity body of the coupling cavity, a sound pressure value in the coupling cavity is obtained by using a laser vibration meter, an open-circuit voltage of a detected hydrophone is obtained through an oscilloscope, and absolute calibration of the sensitivity of the hydrophone is realized. The device and the method are an absolute calibration method, compared with an existing coupled cavity reciprocity method, the method does not need tedious three-transducer reciprocity operation, does not need to determine coupled cavity reciprocity constants, has the advantages of being easy and convenient to operate, real-time, non-contact, traceable and the like, a