THREE-DIMENSIONAL UNDERWATER DETECTING DEVICE

PURPOSE:To easily make a three-dimensional quantitative decision by arraying plural ultrasonic-wave transmitter and receivers in an X-axial and a Y-axial direction, sending transmit beams of different frequencies in plural directions, and detecting the number of reflected beams by frequency separation. CONSTITUTION:This device is equipped with ultrasonic-wave transmitter and receivers 2 and 1 constituted by arraying N ultrasonic oscillators in the X-axis and Y-axis directions, a transmission/reception switch 3 which performs the transmission/reception switching of the transmitter and receivers 1 and 2 through a changeover control circuit 11, and a transmitting circuit 4 and a receiving circuit 5 which has an N-channel circuit respectively. Further, the transmitting circuit 4 transmits a transmit signal from a transmit signal generating circuit 6 in a direction specified by a direction specifying circuit 7. Then, a receive signal is sent by the receiving circuit 5 to a beam generating circuit 8 and an arithmetic processing circuit 9 calculates the three-dimensional size of a reflecting body to display the result on a display device 10.