Actual Pictures
Actual Pictures
Zero line
Zero line
Seabed
Seabed
DISP TRANS
DISP TRANS
DISP SURF
DISP SURF
DISP KEEL
DISP KEEL
figure A
figure A
Seabed
Seabed
Zero line
Zero line
Third reflection of bottom
Third reflection of bottom
Second reflection of bottom
Second reflection of bottom
Seabed
Seabed
In case of a shallow seabed or when increasing the amplifier sensitivity, two seabed lines
In case of a shallow seabed or when increasing the amplifier sensitivity, two seabed lines
may be
may be recorded.
recorded. This resu
This results from
lts from a multi-re
a multi-reflection of
flection of ultra-sonic
ultra-sonic wave be
wave between the
tween the
seabed and hull bottom or surface of
seabed and hull bottom or surface of sea, in such manner: An emitted ultrasonic wave once
sea, in such manner: An emitted ultrasonic wave once
reflected at the seabed returns toward the transducer or surface or sea but reflected at the
reflected at the seabed returns toward the transducer or surface or sea but reflected at the
hull bottom or surface of
hull bottom or surface of sea and again reflected at the
sea and again reflected at the seabed toward the transducer
seabed toward the transducer..
Such multiple
Such multiple recording of
recording of the seabed
the seabed may appear
may appear due to
due to change of
change of bottom quality.
bottom quality. A
A
double or triple reflection may be sometimes recorded.
double or triple reflection may be sometimes recorded.
In any
In any case, a
case, a first reflection recording from
first reflection recording from the zero
the zero line represents
line represents a real
a real seabed return.
seabed return. A
A
first, second and third reflection lines of
first, second and third reflection lines of seabed arrange with approximately equal spaci
seabed arrange with approximately equal spacing on
ng on
the recording.
the recording.
In addition, the shade of the reflection lines fades little by little away from the fast
In addition, the shade of the reflection lines fades little by little away from the fast line on the
line on the
recording.
recording. From these
From these conditions,
conditions, they can
they can be easi
be easily identifie
ly identified as a
d as a multireflection.
multireflection.
Appendix
Appendix 45
45
Summary of Contents for JFE-680
Page 1: ...JFE 680 JFE 680 E Ech cho S o Sou ound nde er r INSTRUCTION INSTRUCTION MANUAL MANUAL...
Page 2: ...4 4th th edition edition...
Page 4: ...4 4th th edition edition General General Information Information ii ii...
Page 10: ...E Ext xte ern rna al l V View iew External External View View viii viii...
Page 17: ...1 1 5 S 5 System Conf ystem Configur iguration ation 1 1 Introduction Introduction 5 5...
Page 21: ...3 3 3 D 3 Dock ocking ing mode mode 3 3 Display Display 9 9...
Page 26: ...Menu Tree 1 Menu Tree 1 4 4 Operation Operation 14 14...
Page 27: ...Menu Tree 2 Menu Tree 2 4 4 Operation Operation 15 15...
Page 49: ...NKF 345 NKF 345 7 7 Installation Installation 37 37...
Page 50: ...NKF 392C NKF 392C 7 7 Installati Installation on 38 38...
Page 61: ......
Page 62: ......
