Fiber-tip bubble-structure microcavity sensor

Chen, D.; Luo, Shuai; Ma, Xin; Jiang, Xiaogang; Feng, G.; Yang, Junjiao

doi:10.1117/12.2070465

Cited by 2 publications

(1 citation statement)

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“…The fitting curve has a good axial-pull sensitivity of 20.46 nm/N and linearity of 99.947%. It is five times higher than the strain sensitivity of optical fiber strain sensor (about 4 nm/N) [ 32 ] in reports. The spectrometer resolution reaches to 1 mN based on the current equipment in laboratory.…”

Section: Sensing Properties Of the Hourglass Optical Microcavity Smentioning

confidence: 98%

Optimal Design of an Hourglass in-Fiber Air Fabry-Perot Microcavity—Towards Spectral Characteristics and Strain Sensing Technology

Wang

Yan

Cui

et al. 2017

Sensors

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An hourglass in-fiber air microcavity Fabry-Perot interferometer is proposed in this paper, and its second reflecting surface of in-fiber microcavity is designed to be a concave reflector with the best curvature radius in order to improve the spectral characteristics. Experimental results proved that the extinction ratio of Fabry-Perot interferometer with cavity length of 60 μm and concave reflector radius of 60 μm is higher than for a rectangular Fabry-Perot interferometer with cavity length of 60 μm (14 dB: 11 dB). Theory and numerical simulation results show that the strain sensitivity of sensor can be improved by reducing the microcavity wall thickness and microcavity diameter, and when the in-fiber microcavity length is 40 μm, the microcavity wall thickness is 10 μm, the microcavity diameter is 20 μm, and the curvature radius of reflective surface II is 50 μm, the interference fringe contrast of is greater than 0.97, an Axial-pull sensitivity of 20.46 nm/N and resolution of 1 mN can be achieved in the range of 0–1 N axial tension. The results show that the performance of hourglass in-fiber microcavity interferometer is far superior to that of the traditional Fabry-Perot interferometer.

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Section: Sensing Properties Of the Hourglass Optical Microcavity Smentioning

confidence: 98%