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12 August 2008Refractive index sensor based on etched D-fibres with wavelength adjustable operating point and resolution
Silica based fibre-optic refractive index sensors are gaining acceptance over conventional refractometers and finding
applications in chemical/biological sensing due to many of their desirable properties. Here we present an optical fibre-based
refractive index sensor that uses the power transmission through etched D-shaped fibres. The sensor's operating
point and resolution can be tailored for a specific application by selecting the correct combination of the operating
wavelength and the cladding thickness of the etched fibre. The sensor's power transmission depends on the surrounding
refractive index in which the sensor head is immersed. The sensor presented has a maximum resolution on the order of
10-6 in its "high resolution" region and on the order of 10-4 in its "low resolution" region. The refractive index at which
the maximum resolution occurs in the high resolution region can be shifted by ~0.012 and by ~0.027 in the low
resolution region. To date, such high resolutions have been reported over narrow ranges and/or for fibre Bragg grating
based sensors, which require optical spectral analysis which typically, is costly.
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Sameer M. Chandani, Nicolas A. F. Jaeger, "Refractive index sensor based on etched D-fibres with wavelength adjustable operating point and resolution," Proc. SPIE 7099, Photonics North 2008, 709924 (12 August 2008); https://doi.org/10.1117/12.806231