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An in-line fluidic absorption coefficient sensor based on the optical microfiber (OM) is proposed. We calculate the
insertion loss of the OM per millimeter after immerged into liquid with various absorption coefficients. Then a 1.8μm
diameter OM with 10 millimeters uniform waist region is used to analyze the absorption of pure water, and the
absorption spectrum from 1525nm-1565nm is achieved from the experiment, agreeing well with the reported absorption
coefficient. The in-line fluidic absorption coefficient sensor has potentially wide sensing range by controlling the
construction of OM for many kinds of absorptive liquids with lower refractive index than silica.
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