English

DTIC ADA086613: A Three-Axis Acoustic Current Meter for Small Scale Turbulence,

Design on the current meter described in this paper began early in 1975 in an attempt to develop an instrument having characteristics suitable for horizontal profiling of small scale turbulence in the ocean. The result of this program was a three-axis instrument suitable for mounting on the bow of a submersible and capable of resolving turbulence phenomena as small as 10 cm with frequency components up to 50 Hz. Included in the overall instrument package was a conductivity-temperature-depth (CTD) system and three-axis accelerometer. During a single scan interval of .01 s all three axes of the acoustic current meter, the three axes of the accelerometer and the conductivity, temperature, and pressure sensors are digitized, resulting in 900 measurements every second. The accelerometer and velocimeter outputs are digitized to 14 bits and the CTD to 16 bit resolution.

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