Radio Frequency Coupled Differential Sensor Coil.
DEPARTMENT OF THE ARMY WASHINGTON DC
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A radio frequency coupled differential sensor provides measurement of projectile muzzle velocity with substantially improved accuracy. The present differential sensor coil is designed to effectively suppress extraneous signals while at the same time detecting the passage of the projectile over a specific interval of time. The differential sensor coil utilizes two concentric single loop inductors in a configuration such that only the inner loop is responsive to the passage of the projectile, while the inner and outer loops are equally responsive to excitation from extraneous sources. An electrically coupled differential amplifier is used to cancel out the signals from the extraneous sources while amplifying the signal from the projectile. An object of the present invention is to provide a radio frequency coupled differential sensor coil for improved muzzle velocity measurements. Author
- Electrical and Electronic Equipment