Electronic speedometer for marine craft

Details Electronic speedometer for marine craft Electronic speedometer for marine craft

1978-12-19

1980-06-03

Woodiel, Donald O.

Measuring and testing

Navigation

Ship's log

G01C 2110

Patent

active

042055520

ABSTRACT:
A pitot tube (10) produces pressure when a marine craft moves through water. The pressure produced in the pitot tube (10) is applied to a monolithic pressure transducer (14) that includes a piezoresistive integrated circuit for producing an output voltage proportional to the pressure applied from the pitot tube (10). The output voltage of the pressure transducer (14) is processed through an op amp (28) and a converter (40) to produce a voltage (E.sub.o) that is linearly proportional to the speed of the marine craft. This voltage (E.sub.o) is applied to a volt meter (62) that is scaled to indicate the speed of the marine craft in distance per unit time.

REFERENCES:
patent: 3820401 (1974-06-01), Lewis
patent: 3916365 (1975-10-01), Giachind

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