Fiber Optic and Laser Digital Pressure Transducers.
NAVAL POSTGRADUATE SCHOOL MONTEREY CALIF
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The theory and response of fiber optic pressure transducers were investigated in a continuation of previous research. A 0.125-inch diameter transducer was built and statically tested. A probe consisting of two concentric glass fiber bundles was used to transmit light to and from the transducer diaphragm. Response was linear through 60 inches Hg. Linearity and sensitivity of response were dependent on diaphragm thickness and probe location, respectively. In a separate experiment, a gas laser was externally modulated by means of a moveable mirror. Axial movement of the mirror corresponding to half-wavelengths of laser radiation produced intensity maxima and minima. This modulation concept was extended to pressure measurement by attaching the mirror to a pressure sensing diaphragm. Author
- Test Facilities, Equipment and Methods