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Introduction
Echo sounders are designed to transmit sonic waves from a transducer and
receive the echo reflected from fish or the bottom of the sea. On previous echo
sounders, images were adjusted by the TVG volume and gain volume, so that
the reflected echo could easily be seen on the echo sounder picture.
This Fish Sizing Echo Sounder needs no TVG volume adjustment, and it
automatically and accurately corrects the sonic wave attenuation under the sea.
Fish schools of the same density are displayed in the same color regardless
of the depth. The features of this system are described below.
<Features>
・ Detection of a single fish with high accuracy.
・ Controller designed for this system.
・ Data recording function installed as the standard feature (row data)
・ High precision digital TVG
・ Function to determine the sea bottom level
・ Supports a dual monitor
In addition, for fish length measurement, which is one of the features of this
system, the split beam method is adopted. The split beam method detects the
level of a single fish (only one fish) with a main receiving beam, and detects the
direction of this single fish with 4 receiving beams. By detecting the fish direction,
the effect of the directive property that is peculiar to ultrasonic waves can be
corrected. Thus, fish length measurement free from the effects of directive
property is possible with high accuracy. For accurate fish length measurement,
please use the following information for reference.
<To accurately measure the fish lengths>
(1) Outside noise reduction
The Fish Sizing Echo Sounder uses faint signals so that the measurement
accuracy can decrease when there is significant outside noise (running noise,
interference, etc.). For such cases, measures are available, such as reducing
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