Abstract
A technique for simultaneous measurement of a 2D bend by using a cantilever-mounted fibre Bragg grating (FBG) is experimentally demonstrated. The value of the two-dimensional deflections is acquired from the central wavelength and chirp bandwidth of the reflection spectrum via the inverse sensitivity matrix. Moreover, an interrogation system with an intensity modulator and a Mach–Zehnder interferometer structure is demonstrated, not only providing wavelength information, but also distinguishing the direction of the horizontal deflection. The measured vertical deflection sensitivity reaches 0.135 nm mm−1, and its horizontal counterparts along the positive and negative axes achieve 0.602 nm mm−1 and −0.572 nm mm−1, respectively.
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