Fiber optic sensor based on MZI to measure urine sugar and micro velocity simultaneously

An optical fiber sensor for the measuring of urine sugar and micro velocity simultaneously based on Mach-Zehnder interference (MZI) was proposed. The urine sugar sensitivity of the proposed sensor reaches up to 0.0047/g/dl under the urine sugar range of 0~0.2g/dl with a linear correlation coefficient of 99.68%. At the same time, the exact expression of the urine micro velocity can also be obtained.