Synchronous in-phase and quadrature demodulation technique for resonant micro-optic gyroscope.
Sign Up to like & getrecommendations! Published in 2019 at "Applied optics"
DOI: 10.1364/ao.58.005050
Abstract: The phase modulation and demodulation technique is widely used in resonant optical gyroscopes to accurately detect resonance frequencies, which directly affect gyro sensitivity. In order to overcome the influences of the system phase fluctuations, an… read more here.
Keywords: phase quadrature; demodulation; demodulation technique; quadrature demodulation ... See more keywords
Polarization-insensitive, omnidirectional fiber-optic ultrasonic sensor with quadrature demodulation.
Sign Up to like & getrecommendations! Published in 2020 at "Optics letters"
DOI: 10.1364/ol.397955
Abstract: We report an ultrasonic sensor system based on a low-finesse Fabry-Perot interferometer (FPI) formed by two weak chirped fiber Bragg gratings (CFBGs) on a coiled single-mode fiber. The sensor system has several desirable features for… read more here.
Keywords: fiber coil; ultrasonic sensor; fiber; quadrature demodulation ... See more keywords
Passive quadrature demodulation of an ultrasonic fiber-optic interferometric sensor using a laser and an acousto-optic modulator
Sign Up to like & getrecommendations! Published in 2019 at "Optics Letters"
DOI: 10.1364/ol.44.002756
Abstract: We propose and demonstrate the use of a single-frequency laser and an acousto-optic modulator (AOM) for quadrature demodulation of fiber-optic ultrasonic sensors whose spectrum features sinusoidal fringes. The light from the laser is split into… read more here.
Keywords: optic modulator; acousto optic; laser acousto; quadrature demodulation ... See more keywords