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CVS-872D
Characteristics of Transducer
Directivity angle and detecting distance of transducers
The diagrams below are to convert the range to finding area under own boat in meters depending on
the spread of directivity angle of a transducer.
For example, when the directivity angle is 50˚, it can be confirmed that you are watching a range with a
diameter of 47 m at depth of 50 m, and a range with a diameter of 93 m at depth of 100 m.
Specifications:
W: Irradiated diameter (m)
θ: Half angle of irradiation (˚)
L: Depth from transducer (m)
θ
L
W
Boat
Example
Water surface
Transducer
50˚
47 m
93
m
Differences of performance and application of transducers depending on their
operating frequencies
Characteristics of transducers vary depending of the operating frequency. The table below shows the
differences of performance and characteristics depending on the frequency.
Frequency
Performance/application
Directivity angle
Detectable depth
Resolution
(Capability to find fish school
distribution)
Influence of air bubble and
underwater noise
Effective application
0092607062-01
W= (tanθ × L) × 2
L' = L÷cosθ
L'
Draft
50 m
100 m
Low frequency
Wide
Deep
Less
Considerably affected
Search in wide range
Finding of sea bottom
sediment
Characteristics of Transducer
Transducer
17˚
50˚
10
40
30
20
0 10
50
Radius (m)
High frequency
Narrow
Shallow
Comparatively less affected
Finding of density of fish school.
Finding of status of fish school at sea
bottom
Depth (m)
0
10
20
30
40
50
60
70
80
90
100
20 30 40 50
More
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