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Optical fiber detector based on light diffraction

Abstract:

We describe a new kind of fiber optics device, which detects directly sound and other perturbations with high sensitivity. The fiber works as a sound transducer able to detect human voice of low power levels. The phase changes, induced by sound waves in the propagating through the fiber light beam, generate amplitude changes after the beam is diffracted at the exit end of the fiber. A specially designed electronic system processes the signal which can be used for sound reproduction and detection. The system can also be used as an all purposes detector for the registration of subsonic and ultrasonic acoustic waves, direct pressure, temperature changes and other external fields.