Abstract
A demodulation scheme for high sensitivity (1–10 krad regime) fiber optic interferometric sensors which is based on fringe rate has been developed. The technique is similar to that utilized in optical shaft encoders. The output of a shaft encoder driven by a pendulum resembles the fringe pattern produced by a fiber optic interferometric sensor in response to a sinusoidal perturbation. This similarity was exploited to design and calibrate the demodulation circuit. An F‐to‐V chip first converts the shaft rotation rate to a proportional voltage level. Additional circuitry determines whether the voltage level should remain positive or be inverted through a comparison of the in‐phase and quadrature waveforms output by the shaft encoder. A 3 × 3 coupler provides these waveforms optically [S. Sheem, J. Appl. Phys. 52, 3865 (1981)]. [Work supported by the Naval Research Laboratory and the Office of Naval Research.]
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
