Whispering Gallery Mode Based Optical Fiber Sensor for Measuring Concentration of Salt Solution

摘要

An optical fiber solution-concentration sensor based on whispering gallery mode (WGM) is proposed in this paper. The WGM solution-concentration sensors were used to measure salt solutions, in which the concentrations ranged from 1% to 25% and the wavelength drifted from the left to the right.The experimental results showed an average sensitivity of approximately 0.372 nm/% and an R~2 linearity of 0.8835.The proposedWGM sensors are of low cost, feasible for mass production, and durable for solutionconcentration sensing.