Cascaded dual-channel fiber SPR temperature sensor based on liquid and solid encapsulations*

Abstract

In order to control the working wavelength range of the fiber surface plasmon resonance (SPR) temperature sensor and realize the wavelength division multiplexing type multi-channel fiber SPR temperature sensor, by comprehensively investigating the influence of liquids with different thermal-optical coefficients and solid packaging materials on the performance of fiber SPR temperature sensor, a dual-channel fiber SPR temperature sensor based on liquid-solid cascade encapsulation was designed and fabricated. The liquid temperature sensing stage encapsulated in capillary worked in 616.03 nm-639.05 nm band, the solid sensing stage coated with pouring sealant worked in 719.37 nm-825.27 nm band, and the two stages were cascaded to form a fiber dual-channel temperature sensor. The testing results indicated that when the temperature range was 35 • C-95 • C, the sensitivity of two-stage temperature detection was −0.384 nm/ • C and −1.765 nm/ • C respectively. The proposed fiber sensor has simple fabrication and excellent performance which can be widely used in various fields of dual-channel temperature measurement and temperature compensation.

Optoelectronic oscillator-based interrogation system for Michelson interferometric sensors

“…[20] Such an OEO-based interrogation system with high resolution and high speed would support practical applications such as bridge security monitoring and industrial machinery sensing. Liquid-filled silica capillary tube [4] Wavelength interrogation Slow 5.086 nm/ • C 0.0039 25-55 based on OSA Long period grating [14] Wavelength interrogation Slow 1.316 nm/ • C 0.0152 25-45 based on OSA Thin fiber-based Sagnac interferometer (SI) [15] Wavelength interrogation Slow 1.55 nm/ • C 0.013 30-94.5 based on OSA Fiber surface plasmon resonance [16] Wavelength interrogation Fast 1.765 nm/ • C 0.198 35-95 based on spectrometer SI [13] Frequency interrogation Fast 2.66 MHz/ • C 0.096 16.5-61.5 based on OEO Mach-Zehnder interferometer [17] Frequency interrogation Fast 3.7 MHz/…”

Wedged Fiber Optic Surface Plasmon Resonance Sensor for High-Sensitivity Refractive Index and Temperature Measurements

“…SPR has been widely applied in many fields such as biochemical analysis, food inspection, environmental monitoring, etc. [ 1 , 2 , 3 , 4 , 5 , 6 ]. Conventional SPR sensing platforms are based on the Kretschmann configuration, where propagating plasmons are excited by compensating the momentum of incident light with a high-refractive-index (RI) prism.…”