Journal
JOURNAL OF LIGHTWAVE TECHNOLOGY
Volume 39, Issue 1, Pages 282-289Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/JLT.2020.3024713
Keywords
Fiber gratings; Cameras; Optical sensors; Biomedical optical imaging; Diffraction; Optical refraction; Chirped fiber bragg grating; cramer-rao bound; fiber bragg grating; modal noise; multimode optical fiber sensor; smartphone-based optical spectrometer; smartphone-based sensor
Funding
- Academic Excellence Project 5-100 by Peter theGreat St. Petersburg Polytechnic University [4.2.1.2]
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This study reports the first smartphone-based interrogation of a fiber Bragg grating sensor, utilizing the smartphone flashlight LED and a transmissive diffraction grating. The measurement sensitivity and resolution were validated through comparison with a commercial spectrometer and theoretical results. Additionally, the influence of modal noise on the smartphone-based fiber optic sensor interrogation system performance was considered for the first time.
Smartphone-based interrogation of a fiber Bragg grating sensor is, to the best of our knowledge, reported for the first time. The smartphone flashlight LED was used as a light source and a transmissive diffraction grating projected the CFBG spectra on the smartphone camera. In order to efficiently couple light from the smartphone LED to the fiber with CFBG, multimode fiber was used for inscription. Interrogation setup consists of a smartphone and low-cost off-the-shelf available components. Measurement principle was illustrated through the fiber strain caused by applied longitudinal force. Attained measurement sensitivity and resolution were validated via comparison with commercial spectrometer and theoretical results based on Cramer-Rao approach. Also, to the best of our knowledge, the influence of modal noise on the smartphone-based fiber optic sensor interrogation system performance is considered for the first time.
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