Patent ID: 7787725
Filing Date: 2010-08-31
Classification: H04R

Abstract:
1. An arrangement for a fiber optic microphone, comprising: at least one pair of optical fibers, each having an input end portion, and an output end portion, made of a material having a critical refractive angle θ the input end portion of a first fiber being connectable to a source of light and the output end portion of a second fiber being connectable to a photoelectrical transducer; the output end portion of said first fiber and the input portion of said second fiber both having an inner diameter, an axis and a rim; said input and output end portions being affixed with respect to each other along a single plane with their rims touching each other at a point, said axes forming an angle α therebetween, an acoustically vibratable membrane being disposed in a housing in spaced-apart relationship to the rims; each of said rims being cut in a plane perpendicular to said single plane and to a bisector of said angle α at said point; wherein: α is determined by the formula α=2 ×θ the membrane is affixed in the housing at a distance from said rims of less than one half the inner diameter of the input and output portions of said optical fibers.