Konsberg EM 124, Руководство по установке

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Transducer array flatness
To avoid unwanted acoustic effects caused by misalignment of the transducer elements
the transducer array must be installed with a flat surface.
It may be most practical to perform these measurements on the transducer mounting
frames before installation of the transducer modules. A final verification after module
installation is then required.
The installed transducer array shall form a plane, the following requirements apply:
• No point on the frame may deviate from the ideal plane with more than the tolerance
limit shown in Technical specifications . The limit will vary between the different
multibeam echo sounders.
A
Ideal plane
B
Installed plane
C
Deviation
• The maximum allowed gradient between two adjacent mounting points is 0.1 %.
A Maximum gradient 0.1 % = 1 mm/m
B
Distance between mounting points
C
Difference in relative height between mounting points
The flatness must be controlled by land survey methods, to the highest possible accuracy.
The survey of the flatness can be carried out independently from the survey of the vessel
coordinate system and alignment of the sensors.
Related topics
Dimensional survey accuracy requirements, page 155
Alignment specifications, page 157
Dimensional surveying and alignment