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AssigneeThe United States of America as represented by the Secretary of the Navy
InventorMalcolm F. McKeag
Estimating the term…
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.
A projectile velocity measurement system for determining velocity of a launched projectile in a launch tube in an underwater environment, the system comprising a transformer adapted for disposition in said tube and having primary and secondary coils, said secondary coils being arranged in discrete groups with an increment of insulation shielding each of said groups of coils from the water environment, said insulation increments being connected to each other and being separable each from its associated group of coils, a strand adapted for interconnecting a first of said insulation increments and said projectile, whereby movement of said projectile through said tube operates to pull said first insulation increment from a first group of said secondary coils, and thereafter successive insulating increments from their respective coils, to expose successively said secondary coils, to cause said secondary coils successively to be disposed in said water and thereby successively shorted out, to reduce the number of active secondary coils to reduce the voltage of said transformer secondary coils, and means for converting the speed of said voltage reduction to velocity of said projectile in said tube.
A method for determining velocity of a launched projectile in a launch tube in an underwater environment, said method comprising the steps of locating in said tube a transformer having primary and secondary coils, arranging said secondary coils in discrete groups, providing an increment of insulation for shielding each discrete group of secondary coils from water therearound, each of said increments of insulation being separable from its respective discrete group of secondary coils, connecting the increments of insulation together serially in tandem, interconnecting said projectile and a first of said increments of insulation with a strand, whereby movement of said projectile through said tube operates to pull said first increment of insulation away from a first group of said secondary coils and thereafter successive of said increments of insulation from their respective groups of secondary coils, to expose successively said secondary coils to cause said secondary coils successively to be disposed in water and thereby successively shorted out to reduce the voltage of said transformer secondary coils, and providing means for converting the reduction in voltage to velocity of said projectile in said tube.
Dependencies are inferred from the claim text.