Electricity: measuring and testing – Electrical speed measuring – Including object displacement varied variable circuit impedance
Patent
1991-10-21
1993-05-11
Snow, Walter E.
Electricity: measuring and testing
Electrical speed measuring
Including object displacement varied variable circuit impedance
324160, G01P 342
Patent
active
052104885
ABSTRACT:
A projectile velocity measurement system for determining velocity of a lahed projectile in a launch tube in an underwater environment, the system comprising a transformer with secondary coils arranged in discrete groups with an increment of insulation shielding each of the groups of coils from the water therearound, the insulation increments being connectable to the projectile and being successively separable from the groups of secondary coils to expose such groups of coils successively to the water to short out such coils and reduce the voltage of the transformer secondary, and means for converting the speed of voltage reduction to the velocity of the projectile in the tube. In the case of launch of the projectile from a submarine, at least preprocessing of the voltage of the secondary is performed in the launch tube, and the preprocessed signal is passed to within the pressure hull of the submarine via a sealed electrical connector in the breechdoor of the launch tube to provide subsafe conditions. A method for determining projectile velocity in a launch tube in a sub-safe manner.
REFERENCES:
patent: 2755439 (1956-07-01), Whitmore
Lall Prithvi C.
McGowan Michael J.
Oglo Michael F.
Snow Walter E.
The United States of America as represented by the Secretary of
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