Polarimetric optical-fibre sensor for biochemical measurements
نویسندگان
چکیده
The use of an optical-fibre polarimeter as a chemical sensor is demonstrated. The compound to be detected is allowed to adsorb onto a decladded 5 cm length of the fibre. The fibre is polarization maintaining with an elliptical fibre core and a D-shaped geometry. The overall retardation stability of this fibre polarimeter is x0.5 x 2x rad m-’ K-‘. With this sensor adsorption processes of proteins can be followed on-line. The resulting relative phase retardations caused by the growth of a monolayer of antibodies (ahCG, ahSA) are -0.25 x 2~. For the much smaller protein hSA, this value is ~0.1 x 21-c.
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