Koden CVS-872D, Installation Manual

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CVS-872D Characteristics of Transducer
0092607062-01 xiii
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.
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
Low frequency High frequency
Directivity angle
Wide Narrow
Detectable depth
Deep Shallow
Resolution
(Capability to find fish school
distribution)
Less More
Influence of air bubble and
underwater noise
Considerably affected Comparatively less affected
Effective application
Search in wide range
Finding of sea bottom
sediment
Finding of density of fish school.
Finding of status of fish school at sea
bottom
Specifications:
W: Irradiated diameter (m)
θ : Half angle of irradiation (˚)
L: Depth from transducer (m)
50 m
100
m
47
m
93
m
Water surface
Boat
Draft
Example
Transduce
r
50˚
W
L
’
L
θ
W= (tan
θ
× L) × 2
L’ = L÷cos θ
Transduce
r Depth (m)
0
10
20
30
40
50
60
70
80
90
100
50˚
17
˚
50
Radius (m)
0 10 20 30 40
1
0
20 30 40 50