Accession Number : ADD015836

Title :   Projectile Velocity Measurement System and Method.

Descriptive Note : Patent application, filed 21 Oct 91, patented 11 May 93,

Corporate Author : DEPARTMENT OF THE NAVY WASHINGTON DC

Personal Author(s) : McKeag, Malcolm F

Report Date : 11 May 1993

Pagination or Media Count : 6

Abstract : A projectile velocity measurement for determining velocity of a launched 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

Descriptors :   *LAUNCH TUBES, *PRESSURE HULLS, *PROJECTILES, *SUBMARINE HULLS, *PATENTS, COILS, CONNECTORS, ENVIRONMENTS, INSULATION, PREPROCESSING, PRESSURE, REDUCTION, SECONDARY, SHIELDING, SIGNALS, SUBMARINES, TRANSFORMERS, TUBES, UNDERWATER, VELOCITY, VOLTAGE

Subject Categories : Submarine Engineering

Distribution Statement : APPROVED FOR PUBLIC RELEASE