Two-parameter elliptical fitting method for short-cavity fiber fabry–perot sensor interrogation

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Abstract

To solve the cavity interrogation problem of short cavity fiber Fabry–Perot sensors in white light spectral interrogation with amplified spontaneous emissions (ASEs) as the white light sources, a data processing method, using an improved elliptical fitting equation with only two undetermined coefficients, is proposed. Based on the method, the cavity length of a fiber Fabry–Perot sensor without a complete reflection spectrum period in the frequency domain can be interrogated with relatively high resolution. Extrinsic fiber Fabry–Perot air-gap sensors with cavity lengths less than 30 µm are used to experimentally verify the method, and are successfully interrogated with an accuracy better than 0.55%.

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Zhang, X., Wang, W., Chen, H., Tang, Y., Ma, Z., & Wang, K. (2019). Two-parameter elliptical fitting method for short-cavity fiber fabry–perot sensor interrogation. Sensors (Switzerland), 19(1). https://doi.org/10.3390/s19010036

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