Journal ArticleDOI
Quantum-noise-limited sensitivity of an interferometer using a phase generated carrier demodulation scheme
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TLDR
In this paper, the authors derived the quantum noise-limited sensitivity for a two-beam interferometer, which uses a phase generated carrier demodulation scheme, and derived the smallest displacement that may be detected if the signal-to-noise ratio is unity.Abstract:
The quantum-noise-limited sensitivity is derived for a two-beam interferometer, which uses a phase generated carrier demodulation scheme. For surface-disturbance-detecting sensors, this sensitivity limit is expressed in terms of the smallest displacement that may be detected if the signal-to-noise ratio is unity. We determine the quantum-noise-limited displacement of the classical Michelson interferometer to be 5 pm.read more
Citations
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Patent
Method and system for stabilizing and demodulating an interferometer at quadrature
TL;DR: In this paper, a method and system for stabilizing and demodulating an interferometer at quadrature is described, where the signal amplitudes appearing at multiple harmonics of the signal are calculated using the Goertzel algorithm.
Journal ArticleDOI
Optical fiber interferometer for measuring the in situ deflection characteristics of microelectromechanical structures
TL;DR: In this paper, an optical fiber interferometer is described for measuring the out-of-plane displacement of microelectromechanical structures, which has a theoretical measurement dynamic range greater than 10 8.
Dissertation
Design and characterisation of long period grating (LPG)-based optical fibre sensors for acoustic wave detection
TL;DR: In this article, the LPG-based sensor was evaluated and optimized under low frequency conditions (up to 3 kHz) both in air and underwater, with varying acoustic pressure values.
Proceedings ArticleDOI
Simulation and testing of a noise-limited demodulation system for a fiber-optic hydrophone system based on a Michelson interferometer
Jiangfei Hu,Duanming Li +1 more
TL;DR: In this paper, a fiber-optic Michelson hydrophone system was used to detect and demodulate underwater acoustic signals using the phase generated carrier (PGC) principle.
Proceedings ArticleDOI
Comparative study of phase demodulation approaches based on PGC and Heterodyne
Jiangfei Hu,Duanming Li +1 more
TL;DR: With comparing and analyzing signal frequency band and amplitude band, it shows that Heterodyne-Arctangent is the best algorithm about demodulation frequency and demodulator amplitude in all of the four demodulated approaches.
References
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Journal ArticleDOI
Homodyne demodulation scheme for fiber optic sensors using phase generated carrier
TL;DR: In this paper, a phase generated carrier is used to detect phase shifts in the microradian range, which obviates the phase tracker resetting problem encountered in active homodyne detection schemes.
Journal ArticleDOI
Theoretical noise-limited sensitivity of classical interferometry
James W. Wagner,James B. Spicer +1 more
TL;DR: In this paper, the signal-to-noise ratios for the path-stabilized, active-heterodyne, Sag, and Fabry-Perot interferometers are calculated for cases in which dynamic surface displacements are detected.
Proceedings ArticleDOI
Fiber optic displacement sensor
TL;DR: In this article, a low cost interferometric displacement sensor has been developed which tracks distance from the tip of a fiber optic probe, and a unique interrogation technique is used which produces a 32-bit phase word, giving the system a dynamic range greater than 109.