18 January 2005 Smart structure of fiber pigtails used in medical laser instruments
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A new type pigtail structure with multi-functionality is proposed. The pigtail is imprinted a length of grating or grating module in it, which can act as sensing element for measuring temperature and/or stain around. Two types of sensing element in the structure are given, one is just one length of FBG and another is the FBG module, which is composed of two identical Bragg gratings separated by a cavity along a single fiber, where the cavity is a segment of the fiber that has photo-elastic and/or thermo-optic coefficients different from that of the gratings. The operational principle of the corresponding sensing structure is analyzed in detail. It is demonstrated that by measuring the reflected spectra from the FBG, the temperature and/or stain can be determined. On the other hand, by simply measuring optical power of the reflected light reflected, the temperature or stain can be independently determined.
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Weiping Liu, Weiping Liu, Weichong Du, Weichong Du, Ge Du, Ge Du, } "Smart structure of fiber pigtails used in medical laser instruments", Proc. SPIE 5630, Optics in Health Care and Biomedical Optics: Diagnostics and Treatment II, (18 January 2005); doi: 10.1117/12.572921; https://doi.org/10.1117/12.572921

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