Detection device using fiber optic techniques

摘要

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 ends concentrically disposed about the center of the diaphragm forms a circle having a radius r.sub.2 where r is greater than r.sub.2 is greater than r.sub.1. A third plurality of optical fibers having fiber ends concentrically disposed about the center of the diaphragm forms a circle having a radius r.sub.3 where r is greater than r.sub.3 is greater than r.sub.2. The ends of the first and third plurality of optical fibers are light capturing and the ends of the second plurality of optical fibers are light emitting. Deflection of the diaphragm is detected when light from the second plurality of fibers is reflected off the diaphragm into the first and third plurality of fibers in proportion to the amount of deflection of the diaphragm according to a predetermined ratio.