Development of a Multichannel, Ultrasonic Telemetry System for the Study of Shark Behavior at Sea
CALIFORNIA STATE UNIV LONG BEACH DEPT OF BIOLOGICAL SCIENCES
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A telemetry system is described which is capable of monitoring the behavior of free-swimming sharks in the natural environment. The transmitters emit 10 msec ultrasonic pulses at 40 kHz, have a life of up to one week, and a maximum range of over 3 miles. The units can transmit one, four, or eight channels of information using either of two types of electronic multiplexing one interpulse intervalchannel, or fixed timechannel. The pulse rate varies with the value of resistive sensors and ranges from .5sec to 5sec. Sensors are described for measuring depth, swimming speed, compass heading, ambient light, and temperature. Single-channel and multichannel transmitters have been used successfully and recovered from pelagic species blue sharks, Prionace glauca and from bottom-dwelling species angel sharks, Squatina california.
- Biomedical Instrumentation and Bioengineering