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A high sensitive two-dimension tilted-meter using the two etched chirped fiber Bragg gratings (CFBGs) is experimentally demonstrated. The sensitivity of tilted angle is 0.303 nm/°, corresponding to the resolution of 0.033°. The proposed 2D tilted meter can be used for measuring the tilted angle and directional angle with the tilted angle ranging from 0° to 35° and the direction angle ranging from 0° to 360°. The operation mechanism is based on the two CFBGs with the superposition wavelength peak shift created by the overlap between the spectra from a CFBG in the liquid and the air region.
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Chiang et al. (2016) studied this question.
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