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2005年04月25日

【期刊论文】Passive Temperature Compensation Technique for Fiber Bragg Grating Displacement Sensor

余有龙， Youlong Yu， Hwayaw Tam， Zhiguo Liu， and Wenghong Chung

，-0001，（）：

-1年11月30日

A novel fiber Bragg grating displacement sensor is introduced. Using a uniform density and thickness overlapped dual-isosceles triangular cantilever beam as strain agent, this sensor is demonstrated experimentally and theoretically to be able to compensate the wavelength-shift induced by temperature automatically. The measured sensitivity of this sensor is 0.1051nm/mm within the working range of-18, 18mm.

fiber optics， Bragg gratings， displacement measurement， sensors， compensation.，

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2005年04月25日

【期刊论文】Optical XOR and NXOR logic operations with erasable self-pumped phase conjugation

余有龙， Youlong Yu， Zuohong Jiang， Jie Ying and Xiaoyi Dong

，-0001，（）：

-1年11月30日

摘要

The phenomenon of erasable self-pumped phase conjugation (SPPC) is explained theoretically. Encoded by intensity, all-optical XOR and NXOR logic functions are performed experimentally by controlling the incident and the erasure beams of SPPC. The time response curves of both operations are shown.

self-pumped phase conjugation， optical logic operation

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2005年04月25日

【期刊论文】Fiber-Laser-Based Wavelength-Division Multiplexed Fiber Bragg Grating Sensor System

余有龙， Youlong Yu， Luenfu Lui， Hwayaw Tam， and Wenghong Chung

IEEE PHOTONICS TECHNOLOGY LETTERS, VOL. 13, NO.7, JULY 2001，-0001，（）：

-1年11月30日

摘要

Abstract-A wavelength-division-multiplexing technique for interrogating 10-cascaded fiber Bragg grating sensing elements based on a ring-compounded-cavity fiber laser is reported. A feedback control technique was introduced to a tunable Fabr-Perot filter that tracks the wavelength-shift of the sensor. The sensors were demodulated using an unbalanced scanning Michelson interferometer and a sensitivity of 1.682/has been demonstrated.

Index Terms-Demodulation and fiber Bragg grating sensor system， fiber Bragg grating， interrogation， ring-cavity laser， wavelength-division multiplexed.，

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2005年04月25日

【期刊论文】Fiber Bragg Grating Sensor for Simultaneous Measurement of Displacement and Temperature

余有龙， Youlong Yu， Hwayaw Tam， Wenghong Chung， and Muhtesem Suleyman Demokan

，-0001，（）：

-1年11月30日

摘要

A new approach for measuring displacement and temperature simultaneously using a specially designed isosceles triangular cantilever beam as a strain agent is demonstrated. A fiber Bragg grating epoxied on the beam surface is experimentally demonstrated to have a temperature sensitivity of about 0.113 nm/℃ below 60℃.

optical fiber sensors， displacement measurement， temperature measurement,， fiber Bragg grating， sensitivity

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2005年04月25日

【期刊论文】A technique fo hancing the thermal stabilit-technique tor enlaanclng te11ermal D111ry OIP hydrogenloaded fiber Bragg grating

余有龙， Youlong Yu， and Hwayaw Tam

CHINESE OPTICS LETTERSlV01. 1, No.5 May 20, 2003，-0001，（）：

-1年11月30日

摘要

Heat treatment with the presence of hydrogen (H2) that react with GeE' centers (Ge) at high tern perature will weaken the refractive index modulation of grating fabricated in hydrogen loaded normal germanosilicate fiber. Pre. annealing treatment of the above fiber was demonstrated to be able to enhance the grating's thermal stability effectively．0.37-nm blue-shift of the reflected Bragg wavelength was ob-served．

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