Channel Master CM-5020 Specifications download pdf (Page 146)

Channel Master Operation Manual

page 138 Teledyne RD Instruments

17 Glossary

If, after reviewing this section, you are unable to find the word/jargon in

question, please send us an e-mail

containing that word. Your questions

will ensure that our glossary remains an effective reference tool for our cus-

tomers.

------ A ------

Acoustic Doppler Current Profiler (ADCP): An instrument that obtains

profiles of water velocity by transmitting sound of known frequency into

the water and measuring the Doppler shift of reflections from scatterers,

which are assumed to be passively moving with the water.

Acoustic Window: A covering for the hull-side opening of a sea chest that

is transparent to sound. A vessel mounted ADCP is typically mounted in a

sea chest and the acoustic window helps to isolate it from biofouling organ-

isms and also the flow noise generated by the vessel.

ADCP: A

coustic Doppler Current Profiler

ADCP Coordinates: Profile data is reported in an orthogonal coordinate

system as referenced to the instrument. Beam 3 is forward. Sideways is to

the right of forward (beam 2 for a down-looking ADCP, beam 1 for an up-

looking ADCP).

Ambiguity: ADCPs determine the radial motion between a source and scat-

terer by measuring the phase change of the reflected signal. Because phase

is periodic, this solution is multi-valued. For example, all three of the dis-

placements shown below will return the same phase measurement, which

results in ambiguity:

Ambiguity Resolution: A method to count the number of wavelengths in-

cluded between two points where phase is measured, thereby removing the

ambiguity associated with measuring only phase.

Ambiguity Velocity: The maximum allowable radial motion for phase

measurements to be unambiguous, corresponding to a maximum observable

velocity, beyond which ambiguity resolution is required.

Autonomous Underwater Vehicle (AUV): An unmanned submersible with

propulsion, generally capable of navigation and accomplishing specific

tasks (such as data gathering).

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Channel Master CM-5020 Specifications Page 146