Multimode coupled waveguide acoustic sensors
Abstract
An experimental study has been made of an optical-waveguide coupler-type acoustic sensor employing multimode fibers. With LED sources the sensor behaves as an optical-intensity-modulation sensor with sensitivities in the 70-80-dB range re 1 micro Pa. Higher sensitivities are obtained by using He-Ne laser sources, but this appears to be due to phase, rather than intensity, modulation processes.
- Publication:
-
Optics Letters
- Pub Date:
- August 1980
- DOI:
- 10.1364/OL.5.000359
- Bibcode:
- 1980OptL....5..359C
- Keywords:
-
- Acousto-Optics;
- Fiber Optics;
- Multimode Resonators;
- Optical Coupling;
- Sound Transducers;
- Acoustic Measurement;
- Helium-Neon Lasers;
- Light Modulation;
- Optical Waveguides;
- Photometers;
- Photosensitivity;
- Instrumentation and Photography;
- FIBER OPTICS;
- ACOUSTICS;
- WAVEGUIDES