Highly sensitive liquid level sensor based on etched fiber Bragg grating

Binfeng Yun; Na Chen; Yiping Cui

doi:10.1117/12.756560

26 November 2007 Highly sensitive liquid level sensor based on etched fiber Bragg grating

Binfeng Yun, Na Chen, Yiping Cui

Proceedings Volume 6830, Advanced Sensor Systems and Applications III; 683003 (2007) https://doi.org/10.1117/12.756560
Event: Photonics Asia 2007, 2007, Beijing, China

Abstract

A highly sensitive liquid-level sensor based on etched fiber Bragg grating is proposed and demonstrated. The fiber Bragg grating is etched to enhance the sensitivity to the refractive index of liquid, when a portion of etched fiber Bragg grating is immersed in the liquid, the original single transmission dip splits into two transmission dips because of the fiber Bragg grating spectrum is affected by the fraction of the length of the etched fiber Bragg grating that is surrounded by the liquid. By measuring the transmission dips variations, the liquid level can be measured. The experiments show that for a liquid level variation of 24mm, the transmission dip difference changes about 32dB. Also in the linear region, a high liquid level sensitivity of 2.56dB/mm is achieved.

Citation Download Citation

Binfeng Yun, Na Chen, and Yiping Cui "Highly sensitive liquid level sensor based on etched fiber Bragg grating", Proc. SPIE 6830, Advanced Sensor Systems and Applications III, 683003 (26 November 2007); https://doi.org/10.1117/12.756560

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