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23 May 2023 Ultrasensitive fiber refractometer based on C-shaped fiber and Vernier effect
Yufei Zhang, Shaoxin Ma, Junfang Jiang, Hang Qu, Xuehao Hu
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Proceedings Volume 12643, European Workshop on Optical Fibre Sensors (EWOFS 2023); 126431H (2023) https://doi.org/10.1117/12.2678437
Event: European Workshop on Optical Fibre Sensors (EWOFS 2023), 2023, Mons, Belgium
Abstract
We propose and experimentally demonstrate a fiber refractometer based on a C-shaped fiber and the Vernier effect. The sensor is fabricated by cascading a single mode fiber (SMF) pigtail together with a C-shaped fiber segment and another SMF segment. Thus, the C-shaped fiber would constitute an open cavity (sensing cavity) in which test analytes could be filled, while the SMF segment would constitute another reference cavity. Due to the similar optical path length of these two cavities, Vernier effect would be activated, thus forming spectral envelops in the reflection spectrum of the sensor. Variations in the refractive index (RI) of analytes would result in the shifts of the spectral envelops. Experiments are carried out in the characterization of the sensor measuring gaseous analytes. The sensitivity of the sensor is found to be ~37238 nm/RIU for gas RI measurement. The proposed sensor features the advantages such as ease of fabrication, extremely high sensitivity, capability of sensing of both gaseous and liquid analytes, small footprint, and good mechanical strength.
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Yufei Zhang, Shaoxin Ma, Junfang Jiang, Hang Qu, and Xuehao Hu "Ultrasensitive fiber refractometer based on C-shaped fiber and Vernier effect", Proc. SPIE 12643, European Workshop on Optical Fibre Sensors (EWOFS 2023), 126431H (23 May 2023); https://doi.org/10.1117/12.2678437
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KEYWORDS
Sensors
Vernier effect
Fiber optics sensors
Fabry Perot interferometers
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