A biological fluid fiber Sagnac sensor based on SPF-PCF-SPF structure

Abstract

A biological solution concentration sensor based on a side-polished fiber (SPF) assisted fluid system is presented. The birefringence properties of the asymmetrically filled fluid in this structure and the relationship between the concentration of the biological solution and the refractive index are theoretically analyzed. It was found that the interference peaks had red-shifted with increasing concentration. A sensing sensitivity of 1.3 87 1×10⁴ nm·mL/mol at 14.68×10⁻⁴ mol/mL was achieved within the experimental range after different concentrations of arginine solutions were injected into the sensing system. This sensing system can also be applied to measure the concentration of other biological solutions, providing the feasibility of real-time detection of biological solutions.

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