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.
Ultrasensitive fiber refractometer based on C-shaped fiber and Vernier effect
European Workshop on Optical Fibre Sensors (EWOFS 2023) ; 2023 ; Mons, Belgium
Proc. SPIE ; 12643
2023-05-23
Aufsatz (Konferenz)
Elektronische Ressource
Englisch
Fiber Optical Bragg Grating Refractometer
British Library Online Contents | 1998
|Simple speckle-based fiber optic refractometer [3211-100]
British Library Conference Proceedings | 1997
|Reflective fiber refractometer based on fiber Bragg grating inscribed in thin-core-fiber
British Library Online Contents | 2015
|Polypyrrole-Coated Polarization Maintaining Fiber-Based Vernier Effect for Isopropanol Measurement
British Library Online Contents | 2019
|British Library Online Contents | 2016
|