DETECTION OF UNDERWATER SUSPENDED MATTER

摘要

PURPOSE:To easily and surely detect underwater suspended matter by oscillating ultrasonic wave toward a plurality of echo sounder receivers arranged and provided underwater from an ultrasonic oscillator provided underwater and sensing fluctuation of the intensity distribution of ultrasonic wave. CONSTITUTION:An ultrasonic wave oscillator 3 is provided underwater in one side in the vicinity of the place wherein medusas 6 being suspended matter to be detected pass. A plurality of echo sounder receivers 4 are provided at many rows and many steps toward the oscillator 3 underwater in the other side. Intensive ultrasonic wave 5 is oscillated toward the receivers 4 from the oscillator 3. Then existence of medusas 6 is detected from change in intensity distribution of ultrasonic wave received by the respective receivers 4. In this case, straightly progressed ultrasonic wave and refracted ultrasonic wave exist in the place wherein medusas 6 float. Therefore intensity of ultrasonic wave received by the respective receivers 4 differs and the status thereof is timely changed. Accordingly medusas 6 are detected by fluctuation of intensity distribution and timely fluctuation.