19 May 2012 Interrogation of in-series double cladding fiber sensor for simultaneous refractive index and temperature measurement
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Abstract
An interrogation scheme for an in-series double cladding fiber (DCF) sensor is proposed and demonstrated, which can be used for simultaneous refractive index (RI) and temperature measurement. It utilizes two commercial distributed feedback lasers to match two cascade DCF sensors which have two band-rejected filtering spectra at different wavelengths. The two lasers were intensity modulated by different frequencies and demodulated by a lock-in amplifier. Experimental results indicated that a resolution of ±2×10-5 in RI and ±1.2°Cin temperature were achieved. Based on the simple and low cost interrogation scheme, the dual parameters sensor system will find potential applications in chemical sensors and biosensors.
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Bo Qi, Fufei Pang, Tingyun Wang, Na Chen, Sujuan Huang, Zhenyi Chen, "Interrogation of in-series double cladding fiber sensor for simultaneous refractive index and temperature measurement", Proc. SPIE 8376, Photonic Microdevices/Microstructures for Sensing IV, 83760F (19 May 2012); doi: 10.1117/12.919183; https://doi.org/10.1117/12.919183
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