An Evanescent Fiber Sensor for Detecting Low-Level Content H2O in D2O Solutions

An optical fiber sensor based evanescent absorption spectroscopy in the infrared range for the quantitative determination of H2O content in D2O has been evaluated. The coiled optical fiber sensor base on evanescent absorption spectroscopy has been investigated to monitor H2O concentration in D2O. The classical least square model has been utilized to build the calibration model and predict the H2O concentrations. The predicted H2O concentration in D2O is acceptably accurate and susceptible. The work demonstrates that the coiled fiber-optic sensor based on evanescent absorption spectroscopy is a feasible analytical technique for prediction of the low-level H2O content during deuterium oxide distillation in on-line and remote situation