Jyoti F. Akki

Detection and determination of manganese concentration in water using a fiber Bragg grating coupled with nanotechnology.

Through this paper we experimentally demonstrate the fabrication of a fiber Bragg grating (FBG) chemical sensor to detect and determine the manganese concentration in water and compare our results with sophisticated spectroscopic methods, such as atomic absorption spectrometry and the inductively coupled plasma method. Here we propose a simple method to develop a thin layer of gold nanoparticles above the etched grating region to enhance the sensitivity of the reflected spectrum of the FBG. By doing so, we achieve a sensitivity of 1.26 nm/parts per million in determining the trace level of Mn in water. Proper reagents are used to detect manganese in water.

Core-cladding mode resonances of long period fiber grating in concentration sensor

Long period fiber grating (LPFG) is photoinduced fiber device that facilitates the coupling of core mode to different cladding modes resulting into series of transmission dips in the transmission spectrum. Here we present LPFG chemical sensor to determine the concentration of Manganese in water at ppm level. We fabricated LPFG of period 600µm in single mode communication fiber using 12W carbon dioxide laser applying point by point method. The fabricated LPFG is directly used as chemical sensor since cladding modes coupled to core mode directly come in contact with surrounding chemicals. Concentration of manganese in our collected sample is found to be 0.0329ppm. The result is verified with sophisticated Atomic Absorption Spectrometer (AAS).

Chemical sensor for nitrate in water using long period optical fiber grating fabricated by point by point method

We present long period grating (LPG) fabrication and application of LPG as chemical sensor. We fabricated LPG of grating period 610μm in single mode communication grade fiber using point by point method. Here we used 12watt CO2 laser to irradiate the fiber. The behavior of resonance wavelength of LPG was studied by immersing it in nitrate solution of concentration ranging from 10ppm to 50ppm. The results showed the linear behavior of resonance wavelength of LPG that can be used to determine the concentration of nitrate in water.