Importance

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Abstract

A curved, elongate transducer assembly contacted by a shock or pressure wave transmits the resultant vibrations to the ends of the member, the vibrations at the respective ends being converted to output signals from which a time difference signal is produced. A computer calculates from the time difference signal the inclination angle of the projectile trajectory relative to a reference line. Two of the curved, elongate transducer assemblies at spaced locations permit calculation of two such inclination angles and, therefrom, the location at which the projectile trajectory passes through a reference plane. The transducer assembly may be a rigid bar with transducer elements at each end, or a single piezoelectric member with pickup electrodes at each end. Two transducer assemblies may be housed in a lower portion of a framework covered with a target sheet of penetrable material to form a chamber, in which case the location at which the trajectory of a subsonic projectile passes through the target sheet may be determined.

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First Claim