sonar

Since 40s, the piezoelectric ceramic materials have been used on sonar underwater audiometer. Piezoceramic has many characteristics required by underwater acoustic sensors, including high hydrostatic sensitivity, high capacity, and can be made into a certain shape and thick section (sensitivity is directly proportional to the thickness of piezoelectric unit). However, the weight of a piezoelectric ceramic is much larger than that of water, so the float must always be added to the structure as compensation.

At present, the trend of sonar development is to install multiple underwater acoustic devices on the hull of the ship. Currently being considered for the long string of towed array and fleet equipped with more and more installed on the hull of the underwater acoumeter. This trend requires the lighter weight of the advanced underwater audiometer, making the piezoelectric film the best choice for this application.

A thick film and cylindrical thick film (1200um) piezoelectric polymer underwater audiometer (Figure 65) has been made. A cylinder with a length of about 2~3cm and a diameter less than 1cm has been set up to be a continuous array of underwater audiometer lines. Underwater acoumeter light (0.60g/cm3), has a very high sensitivity to hydrostatic.

The package on the hull of the piezoelectric polymer under water acoumeter, area of about one square meters, the thickness of piezoelectric polymer has been used for more than 1000um, the British and French Navy submarine. It is known as the "flank array", which works with the long series of towing arrays in the advanced sonar system. ??????,??????????,???? The typical sensitivity of the piezoelectric thick film underwater acoustic sensor is similar to that of the piezoelectric ceramic product (-192 to -195dB at 1V/uPa). The low capacitance of the piezoelectric membrane underwater acoustic sensor is parallel.

The large area and quantity of underwater audiometer are compensated.