WATER DEPTH TELEMETER
The described system employs an underwater telemeter designed for trawl fishing applications, primarily focusing on accurately measuring the depth of the trawl net to optimize fish catching efficiency. The device operates by emitting a modulated ultrasonic beam at a frequency of 21 kHz, which is well-suited for underwater communication due to its ability to travel long distances in water with minimal attenuation.
The ultrasonic beam is transmitted from a transducer mounted on the trawl net, which sends out sound waves that reflect off the seabed. The return time of these sound waves is measured to calculate the exact depth of the net. This depth information is then continuously relayed to the fishing vessel, allowing the crew to make real-time adjustments to the trawl depth, ensuring they are targeting the desired school of fish effectively.
In addition to depth measurement, the system also incorporates temperature sensors to provide information on water temperature. This data is crucial, as fish behavior often correlates with temperature variations, allowing fishermen to adjust their strategies based on environmental conditions.
The integration of both depth and temperature data into a single transmission enhances the efficiency of the fishing operation, minimizing the need for multiple devices and reducing the complexity of the equipment onboard. Overall, this underwater telemeter represents a significant advancement in fishing technology, facilitating more successful trawling operations through precise environmental monitoring.Determines exact depth of trawl net under water, for interception of desired school of fish. Continuous depth information is transmitted to trawler by modulated 21-kc ultrasonic beam, along with water temperature. -F. H. Stephens, Jr. , Underwater Telemeter for Trawl Fishing, Electronics, 32:13, p 66-68. 🔗 External reference
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