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10. Appendix
10-3
Seabed Quality Change
Mud
Rock
In case of a hard seabed composed of rocks etc., its return trails long, as shown in right chart.
In case of a soft seabed made of mud, seaweed, etc., they poorly reflect an ultrasonic wave
to result in thin recording of the seabed with short trail.
The seabed quality can be more sufficiently identified with use of wider beam angle and
longer pulse width.
Usually lower frequency is used.
Abrupt-Sloped Seabed
Sidelobe
False echo
A dim echo may sometimes appear along an abrupt slope of seabed, as if it were floating
above the slope, when recording.
Содержание JFE-700
Страница 2: ......
Страница 15: ...External View xiii External View of JFE 700 Echo Sounder NJA 710 Display processing unit ...
Страница 26: ...1 Introduction 1 8 External Dimension of NKF 394 Gate valve Transducer ...
Страница 27: ...1 Introduction 1 9 External Dimension of NKF 396 Gate valve Transducer ...
Страница 30: ...2 Control Panel 2 2 Blank page ...
Страница 34: ...3 Display 3 4 Blank page ...
Страница 40: ...4 Operation 4 6 4 2 Menu List Menu Tree ...
Страница 54: ...4 Operation 4 20 2 HISTORY print mode 3 LOG print mode Depth data and graph ...
Страница 72: ...4 Operation 4 38 Blank page ...
Страница 78: ...6 Consider Installation 6 2 Blank page ...
Страница 82: ...8 Disposal 8 2 Blank page ...
Страница 84: ...9 Specification 9 2 Blank page ...
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