Sonar detecting method for large yellow croaker escaping from deep water net cage and special equipment thereof

Abstract

The invention discloses a device specially used for sonar-detecting whether large yellow croakers escape from a deepwater net-cage, comprising a computer, a probe which is arranged closely to the net-cage, and a digital to analog adaptive device which is connected with the computer; wherein, the probe is arranged at the external side of the net-cage; the probe comprises a sonar transducer and a flowmeter probe; the digital to analog adaptive device is connected with the probe and can convert the analog signal of the probe into the digital signal and send the signal to the computer; the computer receives the digital signal of the digital to analog adaptive device, processes the digital signal and judges whether the fish escapes or not according to the coupling result of the echo signal scanned by the flowing speed and sonar. The invention also discloses a sonar detection method which utilizes the device to detect whether the fish escapes from the deepwater net-cage simultaneously. The device and the method has the advantages that the device is not affected by water quality, the detection distance is far, the result is exact, the target objects can be intuitively and effectively monitored and detected, and the like.

Description

technical field [0001] The invention relates to a detection method of an aquatic off-shore breeding monitoring system and equipment using the method, in particular to a sonar detection method for large yellow croakers escaping from a deep-water net cage and a special device thereof. This method can not be affected by the turbidity of water quality, and can directly and effectively monitor and detect the target object, and the image obtained by the sonar scan is transmitted to the console through the cable, and the digital signal is converted into an image by the computer program. Background technique [0002] Cage fish farming is a dangerous industry. The fish cultured is only separated from the natural waters by a net, and is greatly affected by wind, waves, disastrous weather and accidents. Especially when a typhoon hits, it will cause the tragedy of breaking the box and escaping. The deep-water net cage is made of a certain strength ABS or HDPE plastic or steel material ...

AI Technical Summary

Problems solved by technology

Moreover, in the coastal waters of the northern and eastern coastal provinces and cities of our country, the water is often dominated by muddy water, and the effective observation distance of the underwater camera is only a few meters, so it is impossible to effectively monitor the deep-water cages.

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