ArticleSensors (Basel, Switzerland)2026
Chirped Fiber Bragg Grating-Based Cavity Sensor for Simultaneous Temperature and Refractive Index Sensing.
Article in Sensors (Basel, Switzerland), 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
In this work, a compact dual-parameter fiber optic sensor for temperature, refractive index, and label-free biomarker-related measurements is presented. The sensor is based on a chirped fiber Bragg grating cleaved inside the grating region, leaving residual grating lengths of 3 mm, 4 mm, and 5 mm. After cleaving, the reflected spectrum becomes narrower and forms clear sidelobes, allowing the main-band wavelength shift to be used for temperature monitoring, while the sidelobe intensity variation is used for refractive index detection. Temperature calibration from 25 °C to 80 °C showed approximately linear responses with sensitivities close to 10 pm/°C. Refractive index calibration in 10-15% sucrose solutions showed a monotonic decrease in sidelobe intensity with increasing refractive index, with sensitivities reaching about -220 dB/RIU for selected valley features and around -200 dB/RIU in the matrix analysis. An extended calibration from 0% to 35% sucrose confirmed that the RI-dependent response was maintained over a broader range, although with increased nonlinearity. Cross-sensitivity coefficients were incorporated into 2 by 2 sensitivity matrices and their inverses for simultaneous parameter reconstruction. Additional measurements under combined temperature and sucrose concentration changes demonstrated temperature reconstruction with RMSE values of 0.87-2.69 °C, depending on the sensor and experimental conditions. Finally, as a proof-of-concept experiment, the cleaved-CFBG sensors were biofunctionalized with anti-VEGF antibodies and tested for VEGF detection from 10
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