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US 4,542,342 AGranted
Apparatus for measuring projectile's transverse displacement at gun muzzle
AssigneeThe United States of America as represented by the Secretary of the Army
InventorsJimmy Q. Schmidt, Rurik K. Loder
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Abstract
A multi-segmented radio frequency excited inductance coil sensor is operaely disposed on the muzzle end of a gun tube for the purpose of detecting the transverse displacement of a projectile from the center axis of the gun tube. The apparatus comprises a combination of sum and differencing amplifiers which combine detected signals into a form which can be used to compute the angle and magnitude of displacement.
Claims7
An apparatus for measuring a projectile's transverse displacement at muzzle exit of a gun tube which comprises:
- first coil means for electromagnetically sensing relative proximity and "left" and "right" displacement of said projectile in terms of currents induced by the mechanical motion of said projectile;
- second coil means for electromagnetically sensing relative proximity and "up" and "down" displacement of said projectile in terms of currents induced by the mechanical motion of the said projectile;
- oscillator means for providing an RF signal to said first and second coil means;
- means for electrically coupling said oscillator means to said first and second coil means;
- means for fixedly holding said first and second coil means to the muzzle end of said gun tube, and for orienting said first and second coil means in an orthogonal position to each other;
- first detector means electrically coupled to said first coil means for amplitude detecting changes in RF signals generated across a "left" sensor segment of said first coil means, and for generating a "left" output pulse;
- second detector means electrically coupled to said first coil means for amplitude detecting changes in RF signals generated across a "right" sensor segment of said first coil means, and for generating a "right" output pulse;
- third detector means electrically coupled to said second coil means for amplitude detecting changes in RF signals generated across an "up" sensor segment of said second coil means, and for generating an "up" output pulse;
- fourth detector means electrically coupled to said second coil means for amplitude detecting changes in RF signals generated across a "down" sensor segment of said second coil means, and for generating a "down" output pulse;
- first differential amplifier means for generating a left-right differential output signal which is a function of the difference in amplitude of said "left" and "right" output pulses;
- first summing amplifier means for generating a left-right summing output signal which is a function of the sum of said "left" and "right" output pulses;
- second differential amplifier means for generating an up-down differential output signal which is a function of the difference in amplitude of said "up" and "down" output pulses;
- and
- second summing amplifier means for generating an up-down summing output signal which is a function of the sum of said "up" and "down" output pulses;
- wherein said "left-right", up-down differential output signals and said left-right and up-down summing signals are recorded for computation of angle and magnitude of displacement of said projectile in relationship to the bore axis of said gun tube.
12 more elements
Dependencies are inferred from the claim text.