US 12,078,465 B2
Piezoelectric sensor arrangement and a method of discriminating signals
Tony Holm, Degerfors (SE); and Johan Östlund, Örebro (SE)
Assigned to SAAB AB, Linköping (SE)
Appl. No. 16/982,374
Filed by SAAB AB, Linköping (SE)
PCT Filed Mar. 15, 2019, PCT No. PCT/SE2019/050231
§ 371(c)(1), (2) Date Sep. 18, 2020,
PCT Pub. No. WO2019/182495, PCT Pub. Date Sep. 26, 2019.
Claims priority of application No. 1800060-4 (SE), filed on Mar. 19, 2018.
Prior Publication US 2021/0003376 A1, Jan. 7, 2021
Int. Cl. H01L 41/113 (2006.01); F42C 11/02 (2006.01); F42C 15/40 (2006.01); H10N 30/30 (2023.01)
CPC F42C 11/02 (2013.01) [F42C 15/40 (2013.01); H10N 30/302 (2023.02)] 8 Claims
OG exemplary drawing
 
1. A piezoelectric sensor arrangement for use in a projectile, said piezoelectric sensor arrangement comprising a piezoelectric sensor fully or partially enveloped by a damping layer adapted to
attenuate at least some mechanical wave frequencies, wherein the piezoelectric senor is arranged to generate a voltage output signal indicative of a mechanical wave traveling through the body of the projectile upon impacting on an object,
wherein the sensor arrangement is arranged to integrate the voltage output signal over time, wherein the sensor arrangement is arranged to compare said integrated value with a predetermined threshold, wherein integral values above said threshold are indicative of the projectile impacting objects that are hard targets, and
wherein the damping layer attenuation of mechanical wave and the integration of the voltage output signal together are arranged to filter mechanical wave frequencies above a predetermined cutoff frequency, wherein mechanical wave frequencies above said cutoff frequency are indicative of the projectile impacting objects that are soft objects, and wherein said predetermined cutoff frequency is at most 800 Hz.