The Research On Automatic Testing Technology Of Underwater Acoustic Transducer's Electroacoustic Characteristics

In the underwater measurement,it is important to measure the parameters of the hydroacoustic transducer.In the past several decades,underwater acoustic measurement's theories and methods have been developed completely.Among so many mature methods,Reciprocity Method and Comparison Method are most widely used.Many predecessors have already developed a variety of test systems.The program control of oscilloscope and the key technology of hydroacoustic transducer's automatic test are studied.A scheme of oscilloscope-based test system is proposed,which uses Reciprocity Method and Comparison Method under the pulse signal.The process of the multi-frequency way to measure transducers' directivity and the Reciprocity Method automatic measurement is designed.The whole automatic measurement system consists of signal source,power amplifier,oscilloscope,filter amplifier and rotary device.A good interactive software is designed on Microsoft Visual Studio.The hardware and software system realizes the highly efficient automated test of underwater acoustic transducer's main parameters.It describes the background and significance of the research on the transducer test system firstly.The basic parameters and measurement methods of the underwater acoustic transducer are introduced.The design and implementation scheme of the test system are proposed according to the transducer measurement requirements specified by the national standard.Then,the key technologies used in the oscilloscope-based test system are studied,including multi-frequency point simultaneous measurement method of transducer's direction,automatic measurement method of reciprocity method,selection of measurement area of pulse signal to be measured and so on.It describes the design and implementation of the measurement system from two aspects: hardware composition and software implementation.It details the hardware control,software program modules and measurement processes in the automatic measurement of transducer's parameters such as receiving voltage sensitivity,transmission voltage response,and transmiting/receiving directionality.And then,pool experiments are conducted on the designed test system,compared and analyzed the correctness of the test results and the measurement uncertainty.As a result,the underwater acoustic transducer test system developed in this thesis not only can complete the measurement task of the main electroacoustic parameters of the hydroacoustic transducer with multiple measurement methods,but also has the characteristics of easy setup,convenient transplantation,and easy maintenance.At the end of this thesis,a summarization and some improvements are proposed.