Abstract
Detection of various environmental parameters is a field of growing interest which finds applications in diverse areas ranging from civilian uses to the chemical, food, medical, military, pharmaceutical industries, etc. Optical fiber passive sensors offers new and wide range of interesting characteristics which overcame most of the disadvantages encountered with conventional sensors available over five decades ago. The optical fibers with their advantages such as light in weight, low attenuation, passive in nature, possibility of multiplexing, immune to EMI & RFI, inertness to chemicals, applications in OTDR (optical time domain reflectometry) and their minimum invasiveness among others makes them to be the best alternative to the traditional sensors. These are suitable alternative to electronic sensors especially in electrical noisy environment. In the present paper a method of measuring various environmental analytes such as refractive index, density, viscosity, ultrasonic velocity, molar volume, molar refraction, dielectric constant, acoustic impedance, adiabatic compressibility, viscous relaxation time, intermolecular free length, Gibb’s free energy, free volume, internal pressure, effective mass, concentration and mole fraction and their mechanism behind it has been studied using chemical mixtures with the combination of methanol and toluene. The sensor is calibrated as a multifunctional device at the temperature of 303.15K using 660nm light source.
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