SIMULTANEOUS ECHO SOUNDER OF WATER DEPTH AND SOUND VELOCITY USING TWO-SIDED ULTRASONIC SENSOR

摘要

PURPOSE: A water depth and sound speed simultaneous measurement device is provided to obtain accuracy of shift beam echo sounder data and to shorten post-processing time. CONSTITUTION: A both sided supersonic sensor(10) comprises a piezo ceramic(11), a first a-layer(12), a sound-absorbing material(13), a second layer(14), a first b-layer(15), and a sensor housing(16). The piezo ceramic generates ultrasonic waves according to a predetermined cycle as an ultrasonic oscillator. The first a-layer is attached to the lower side of the piezo ceramic and forms a polyurethane layer. The first a-layer transfers the ultrasonic waves having basic beam width of the piezo ceramic at underwater. The sound-absorbing material is attached in order to surround the side of the piezo ceramic and controls noise entered through the side of the piezo ceramic. The second layer reduces the basis beam width of the piezo ceramic and eliminates reflective waves. The first b-layer is attached to the second layer and forms a polyurethanes layer. The first b-layer transfers the ultrasonic waves in which the basis beam width is reduces at underwater.