A deflection detection device for monitoring deflection of a diaphragm having a radius r has a first plurality of optical fibers having fiber ends concentrically disposed about the center of the diaphragm at a radius r.sub.1 where r.sub.1 is less than r. A second plurality of optical fibers having fiber...http://www.google.se/patents/US4799751?utm_source=gb-gplus-sharePatent US4799751 - Detection device using fiber optic techniques
