A Calibration Method Based on Linear InGaAs in Fiber Grating Sensors Interrogation System  

作　　者：TAO Jun ZHANG Xia 

机构地区：[1]Physics School of Science, Wuhan University of Technology, Wuhan 430070, CHN [2]Digital Engineering Research Center, Huazhong University of Science and Technology, Wuhan 430074, CHN

出　　处：《Semiconductor Photonics and Technology》2009年第1期16-20,共5页半导体光子学与技术（英文版）

摘　　要：In accordance with the characteristics of wavelength shift detection in fiber grating sensor interrogation system,the wavelength interrogation system which uses linear InGaAs as the spectrum receiver is proposed.Orientation of optic spectrum line affects the silt of volume phase grating and size of InGaAs photosensitive unit,thus the calibration method is needed.Based on an analysis of InGaAs imaging model,least square curve fitting method is proposed to detect spectrum wavelength and InGaAs photosensitive unit position.The experimental results show that the methods are effective and the demodulation system precision is improved.In accordance with the characteristics of wavelength shift detection in fiber grating sensor interrogation system, the wavelength interrogation system which uses linear InGaAs as the spectrum receiver is proposed. Orientation of optic spectrum line affects the silt of volume phase grating and size of InGaAs photosensitive unit, thus the calibration method is needed. Based on an analysis of InGaAs imaging model, least square curve fitting method is proposed to detect spectrum wavelength and InGaAs photosensitive unit position. The experimental results show that the methods are effective and the demodulation system precision is improved.

关 键 词：fiber grating sensor interrogation linear InGaAs spectrum wavelength least square curvefitting 

分 类 号：TP212.14[自动化与计算机技术—检测技术与自动化装置]