Measuring and testing – Navigation – Ship's log
Patent
1990-09-24
1992-04-07
Woodiel, Donald O.
Measuring and testing
Navigation
Ship's log
73189, G01C 2110
Patent
active
051016621
ABSTRACT:
An omnidirectional speed sensing system includes a rotatable member; a channel supported by the rotatable member and having an inlet and an outlet; a single pressure sensing port in the system disposed the channel between the inlet and the outlet for sensing the dynamic pressure of the fluid flow through the channel which pressure is a function of the rotational speed of the rotatable member and the velocity of the rotatable member through the fluid; transducer means responsive to the pressure at the sensing port for producing a pressure signal; means responsive to the pressure signal for extracting the first harmonic of the pressure signal; and means responsive to the magnitude and phase of the first harmonic of the pressure signal for indicating the velocity and direction of the sensed speed.
REFERENCES:
patent: 3372596 (1968-03-01), Keller
patent: 3382715 (1968-05-01), Larkam et al.
patent: 3400584 (1968-09-01), Beilman
patent: 4360888 (1982-11-01), Onksen et al.
Pacer Systems Inc.
Woodiel Donald O.
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