An Overview of Different Type of Chemical Sensors and Their Configurations

Abstract

This paper presents thebasic concept of optical fiber in terms introduction, which gives an overview of the optical fiber, including the classifications, type, mode dispersion, attenuation losses etc. Some basic optical fiber sensor technologies are reviewedunder this we study about the different type of sensors that introduced the principle and different type of optical sensors based on sensing location i.e. extrinsic and intrinsic sensors, based on operating principle i.e. Process involving Demodulation, Sensor based on Intensity Modulation, Sensors based on Phase Modulation , Sensors based on Polarization Modulation, Sensors based on Wavelength Modulation, which are constructed on application that can measure temperature, stress, pH, , blood flow along with glucose content .These sensors are also used in analysis of gases, spectroscopic studies and etc. and at last we study about some  chemical sensors, under this we study the Fluorescence-Based Intrinsic FOCS, Intrinsic FOCS based on absorption, Chemical Sensors involving Planar Waveguide, ‘Fluorescence-Based PWCS’, ‘Refractometric PWCS’, PWCS based on Absorption. FOCs in association with various stands are now being used in ‘optical chemical sensing’. These sensors applicable in observing the amount of specific chemical species inside a trial of concern. A ‘negative fiber’ is positioned in among the dual ‘positive fibers. As stated, the measured is prearranged spectrally for FBG sensors, and therefore the ‘interrogators’ are typically intended to calculate shifts in Bragg wavelength and change the outcomes to measured data. In this it explains the ideologies of procedure of ‘waveguide’ and diverse categories of ‘interferometers’ used for chemical sensing.