A smart bending sensor with a novel temperature- and strain-insensitive long-period grating

A simple bending sensor is performed with a novel insensitive long-period fiber grating (LPG). The characteristic of the insensitive LPG has been experimentally presented, which has the pitch and the notch wavelength of 440 μm and 1516.2 nm at 20 °C. We have investigated temperature and strain insen...

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Bibliographic Details
Published in:Sensors and actuators. A. Physical. 2004-10, Vol.116 (1), p.103-106
Main Authors: Chen, Shaohua, Tong, Zhengrong, Zhao, Qida, Liu, Zhiguo, Dong, Xiaoyi
Format: Article
Language:English
Subjects:
Application
Insensitive
Long-period grating
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Summary:A simple bending sensor is performed with a novel insensitive long-period fiber grating (LPG). The characteristic of the insensitive LPG has been experimentally presented, which has the pitch and the notch wavelength of 440 μm and 1516.2 nm at 20 °C. We have investigated temperature and strain insensitivities. The temperature coefficient is about 0.003 nm/°C from 10 to 50 °C, and the strain coefficient is only about 15 nm/ε, which are about 1/30 and 1/100, compared with the corresponding coefficients of the conventional devices with typical values of 0.083 nm/°C and 1521 nm/ε, respectively. It is fabricated as a bending sensor without any treatment to eliminate the temperature and strain effects, and the bending sensitivity is the same order as the ordinary one. At the same time, the temperature- and strain-insensitive LPG will have wide prospect for other smart fiber sensors and communication devices.
ISSN:0924-4247
1873-3069
DOI:10.1016/j.sna.2004.02.043