An optical sensor and method for detecting a projectile velocity vector includes optically detecting the arrival of a projectile. The sensor includes a sandwich of a transparent layer within two reflective layers, which in turn are within two opaque layers. An optical sensor structure includes a set...http://www.google.es/patents/US6931166?utm_source=gb-gplus-sharePatente US6931166 - Optical sensor and method for detecting projectile impact location and velocity vector
Optical sensor and method for detecting projectile impact location and ...
