Underwater Acoustic Telemetry for Oceanographical and Limnological Research (Part II)

Abstract

The acoustic telemetry system described in this paper is designed for measuring depth, water temperature and turbidity in a reservoir. This instrument is self-contained and transmits a modulated super sonic F-M signal to a hydrophone near the shore or the surface of the reservoir. The transmitted signal is received and then demodulated to recover the original information for depth, water temperature and turbidity by a specially designed F-M receiver, and recorded on a D. C. recorder. The system is completely acoustical and eliminates the need for electrical cables or other connecting devices. This can be also used for oceanographical observations in deep sea.