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The Modular Fish School Detector's Working Principle and Application

The ultrasonic fish detector consists of a display host, ultrasonic sensors, and other accessories. During work, the principle of ultrasonic emission, reflection, and reception is mainly utilized. At present, the application of sonar technology for fish resource assessment has been widely studied internationally, and various forms of data recording and processing systems have been developed.


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1. Working principle


The ultrasonic fish detector consists of a display host, ultrasonic sensors, and other accessories. During work, the principle of ultrasonic emission, reflection, and reception is mainly utilized. Using ultrasound as a detection method, it is necessary to generate and receive ultrasound. The device that completes this function is an ultrasonic sensor, commonly known as an ultrasonic transducer. 


When the fish detector works, the signal is first transmitted by an ultrasonic sensor, which propagates in the water. When the transmitted signal encounters media different from water, such as solids, gases, etc. (mainly fish schools, seabed rocks, etc.), a portion of the signal will be reflected back, and the reflected signal will be filtered by the sensor and input to the display host for analysis and processing. The microelectronic processor in the host will analyze and process the filtered signal and display the analysis results in an intuitive interface, such as the structure of the bottom, water depth, fish position, and fish size.


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2. Workflow


The fish detector relies on sonar to detect the presence and orientation of fish, and depth is measured using a compass to provide compass azimuth, temperature, and pitch angle for underwater measurement points; Due to the inability of the computer to accept analog signals output by the speed sensor interface of the sonar, a hardware device data acquisition device has been added to the system to perform analog-to-digital conversion on the data output by the probe and temporarily store it. 


The computer reads and analyzes the measurement and detection data of each device at regular intervals, and then obtains the results through analysis and processing. The results are displayed on the CRT display screen at the same time, allowing for a comprehensive view of navigation, detection, and fishing, bringing great convenience to fishing operations.


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3. Application


With the development of ocean exploration and development, solving the problem of perception and transmission of underwater targets is receiving increasing attention from people. Hydroacoustics is the science of solving the transmission and processing of information in the ocean. Underwater acoustics mainly studies the radiation, propagation, and reception of sound waves underwater, in order to solve various acoustic problems related to underwater target detection and information transmission processes. As an information carrier, sound waves form the spatiotemporal structure of sound fields in the ocean, which has become a fundamental research topic in modern underwater acoustics. Extracting the spatiotemporal structure of sound field information in the ocean is a means we use for underwater exploration, recognition, communication, and environmental monitoring, such as long-distance target exploration, ocean resource development, and fish school detection. It goes without saying that these are of great significance for the national economy, national defense construction, and scientific research.


As people's exploration of the ocean becomes increasingly widespread, the scope of use of fish detectors is also expanding. At the same time, with the development of usage needs, fish detectors have gradually evolved from a single function to a multi-functional combination, making it more convenient for users to use and meet their needs.


Our PremierCable provides Ethernet Adapter Cable for modular fish school detectors, as well as other marine waterproof connectors and cables for connecting radar, weather modules, or various displays. It is compatible with different brands and models and supports customization. For more information, please feel free to inquire


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