FIBER BRAGG GRATING FOR TEMPERATURE SENSING

The present invention provides a fiber Bragg grating [10] made of boron co-doped germanium fiber [12], a Bragg grating [14] part wherein chemically etched and thermally regenerated. By using an optical fiber diameter of 125 ?m, the grating is etched to core diameter of 4 to 8 ?m. Annealing is perfor...

Ausführliche Beschreibung

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Bibliographische Detailangaben
Hauptverfasser:	Lim Wei Sin, Lim Kok Sing, Chong Wu Yi, Harith Ahmad
Format:	Patent
Sprache:	eng
Schlagworte:	DEVICES OR ARRANGEMENTS, THE OPTICAL OPERATION OF WHICH ISMODIFIED BY CHANGING THE OPTICAL PROPERTIES OF THE MEDIUM OF THEDEVICES OR ARRANGEMENTS FOR THE CONTROL OF THE INTENSITY,COLOUR, PHASE, POLARISATION OR DIRECTION OF LIGHT, e.g.SWITCHING, GATING, MODULATING OR DEMODULATING FREQUENCY-CHANGING NON-LINEAR OPTICS OPTICAL ANALOGUE/DIGITAL CONVERTERS OPTICAL LOGIC ELEMENTS OPTICS PHYSICS TECHNIQUES OR PROCEDURES FOR THE OPERATION THEREOF
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Beschreibung
Zusammenfassung:	The present invention provides a fiber Bragg grating [10] made of boron co-doped germanium fiber [12], a Bragg grating [14] part wherein chemically etched and thermally regenerated. By using an optical fiber diameter of 125 ?m, the grating is etched to core diameter of 4 to 8 ?m. Annealing is performed on the Bragg grating [14] at a regeneration temperature of about 680 oC to induce thermal regeneration. The present invention successfully overcomes the problems of The present invention provides a fiber Bragg grating [10] made of boron co-doped germanium fiber [12], a Bragg grating [14] part wherein chemically etched and thermally regenerated. By using an optical fiber diameter of 125 ?m, the grating is etched to core diameter of 4 to 8 ?m. Annealing is performed on the Bragg grating [14] at a regeneration temperature of about 680 oC to induce thermal regeneration. The present invention successfully overcomes the problems of low measurement resolution by utilizing etched-cored boron co-doped germanium fiber [12] and low photosensitivity due to rapid decay of grating strength above 400 ?C whereby thermal regeneration of grating refractive index occur at 680 ?C. As such, the present invention can be applied in high temperature sensing of up to 700 ?C. Fig. 3 to accompany abstract