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- W2942457325 abstract "Due to the characteristics of low loss, passivity, and long-distance transmission, interferometric fiber-optic hydrophones and their arrays have been widely used in engineering detection applications. The arm length difference is one of its main performance parameters. A system for measuring of arm length difference using extra-carrier modulation and interference fringe counting method is introduced in detail. The propagation process of optical signal in the fiber-optic hydrophone is described. The mathematical expression of the phase of interferometric optical signal intensity caused by external carrier is given and analyzed. The expression of arm length difference and its evaluation of measurement uncertainty are obtained. Experimental study on measurement of arm length difference is developed. Both theoretical analysis and experimental results show that the product of the driving voltage of the fiber stretcher and the arm length difference has fixed value. Combining the known arm length difference value and the carrier driving voltage of the reference interferometer, the arm length difference of the hydrophone to be measured can be calculated with the value of its carrier driving voltage accurately. The uncertainty of measurement of the device and method described in this paper is better than 0.5%. The measuring range is 0.1 m to 500 m." @default.
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- W2942457325 date "2019-03-01" @default.
- W2942457325 modified "2023-10-15" @default.
- W2942457325 title "Measurement of arm length difference of interferometric fiber-optic hydrophone using extra-carrier modulation and interference fringe counting method" @default.
- W2942457325 doi "https://doi.org/10.1121/1.5102059" @default.
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