EM 122
Transducer arrays
This chapter describes the installation of the EM 122 Transmit (TX) and Receive (RX)
Transducer Arrays.
Drawings showing the installation principles and the physical dimensions are included in
the text. Other drawings are included in the
Drawing File
.
Topics
•
on page 18
•
on page 20
•
on page 23
•
on page 26
•
on page 28
•
on page 28
•
on page 32
Installation principles
Basic description
The EM 122 uses separate transducer arrays for transmitting and receiving sound pulses.
Both transducer arrays comprise several modules which are assembled in mounting
frames. These are normally fixed in a customized structure on the hull of the vessel.
Note that the transmitter and receiver modules are of different types.
The two transducer arrays are normally mounted as “T” or “L”-configurations, or a
similar variant under the vessel’s hull (Mills Cross configuration).
The transmit transducer array should be approximately aligned parallel to the vessel's
keel. The receiver transducer array should be approximately aligned 90º on the keel.
Both transducers should be horizontal, approximately on a plane on the keel. There is no
need for the arrays to have the exact same heading, roll and pitch.
For best performance at very shallow depths, keep the alongship distance between RX
and TX array as small as possible.
18
317669/B
Summary of Contents for EM 122
Page 1: ...EM 122 Multibeam echo sounder Installation Manual...
Page 2: ......
Page 13: ...EM 122 Figure 1 System diagram 317669 B 11...
Page 26: ...EM 122 Figure 6 EM 122 Gondola example Cd021 107 24 317669 B...
Page 27: ...Transducer arrays Figure 7 EM 122 blister and steel pipe arrangements example 317669 B 25...
Page 42: ...EM 122 B B B Plastic TX protection window 40 317669 B...
Page 46: ...EM 122 Figure 10 EM 122 Transceiver unit mounting 44 317669 B...
Page 52: ...EM 122 Figure 13 Rear view 50 317669 B...
Page 54: ...EM 122 Figure 15 Preamplifier Unit mounting 687 52 317669 B...
Page 60: ...EM 122 Figure 18 Remote Control Junction Box outline dimensions 58 317669 B...
Page 85: ...Cable layout and interconnections Figure 32 Transceiver Unit sub racks rear view 317669 B 83...
Page 88: ...EM 122 Figure 34 Preamplifier underneath view 86 317669 B...
Page 128: ...EM 122 Ice window Figure 59 TX Ice window 126 317669 B...
Page 129: ...Drawing file Figure 60 RX Ice window 317669 B 127...
Page 131: ...Drawing file Preamplifier Unit Figure 62 RX Preamplifier Unit internal cabling 317669 B 129...
Page 132: ...EM 122 Figure 63 RX Preamplifier Unit internal cabling 130 317669 B...
Page 154: ...2013 Kongsberg Maritime...
