水中超音波によるテレメータ

Abstract

The acoustic telemetering device was designed for measuring depth, water tempe-rature and turbidity in reservoirs and lakes. This instrument is self-contained, andtransmits the modulated super sonic f-n signal to a hydropone near the surface of thelake or reservoir.This instrument was applied to the observation in Biwa Lake and Amagase reservoir, and some typical temperature stratifications in Biwa Lake were clearly recorded. Therewas the discrepancy between the records of the temperature profile observed in a jumpinglayer of water temprature in accordance with the lowering speed of the instrument, andit was found that this discrepancy may be due to a time constant of the thermal element.