DEVELOPMENT OF TOWED IMPELLER SPEED SENSORS FOR CALIBRATING SHIPS' ELECTROMAGNETIC LOGS, PHASE III.
Research and development phase rept.,
NAVY MARINE ENGINEERING LAB ANNAPOLIS MD
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A prototype towed impeller speed sensor was developed by MEL for use as a speed reference in the calibration of ships electromagnetic logs. The calibrator provides a simple, practical method for ships speed calibration to within plus or minus 0.3 knot from 4 to 25 knots provided compensating runs equivalent to measured-mile techniques are used to minimize the effects of current gradients and wind. Each sensor must be calibrated individually to obtain sensor accuracy to within plus or minus 0.2 knot and to ensure proper operation of pulse generation mechanism. System operation and calibration techniques are given for a system based on the MEL prototype for surface ships. Design and fabrication details for the MEL experimental calibration system are given for use as guides in the commercial procurement of systems for Fleet use. Author
- Marine Engineering