Abstract
The effect of diametric load on the wavelength of the reflected light from a fiber Bragg grating (FBG) as a transverse load sensor is investigated experimentally. The diametric load will cause the stress-induced birefringence in optical fiber. This birefringence will separate the reflected resonance peak of the fiber Bragg grating. The spacing of the two separated reflected peaks indicates the diametric stress, which is proportional to the transverse load on the fiber. In this paper, we present some experimental results of transverse load sensing using a fiber Bragg grating. An erbium doped fiber (EDF) amplified spontaneous emission (ASE) source is introduced as a broadband light source, and the reflected light from the grating is directly into an optical spectrum analyzer (OSA) to observe the reflected peaks of the Bragg grating. In our experiment, the transverse load is from 0 to about 2.3N/mm. The resonance peak separation is very distinct when the load is higher than 0.8N/mm. We also expand the sensor into multi-point distribution sensing. Three FBG’s with different resonance wavelength are placed in the sensing circuit. This experiment system can be applied in transverse load sensing, especially in smart structure or precision structure in which the size of the sensor is limited strictly.
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