Concentration sensor based on a tilted fiber Bragg grating for anions monitoring
The ubiquity and importance of anions in many crucial roles accounts for the current high interest in the design and preparation of effective sensors for these species. Therefore, a tilted fiber Bragg grating sensor was fabricated to investigate individual detection of different anion concentrations in ethyl acetate, namely acetate, fluoride and chloride. The influence of the refractive index on the transmission spectrum of a tilted fiber Bragg grating was determined by developing a new demodulation method. This is based on the calculation of the standard deviation between the cladding modes of the transmission spectrum and its smoothing function. The standard deviation method was used to monitor concentrations of different anions. The sensor resolution obtained for the anion acetate, fluoride and chloride is 7910?5mol/dm3, 11910?5mol/dm3 and 7810?5mol/dm3, respectively, within the concentration range of (39396)10?5mol/dm3.
sensors tilted fiber bragg gratings anions refractive index chemical sensors bio-chemical compounds