Abstract
Abstract. This article discusses the properties of different diamagnetic and paramagnetic materials for a basic current/magnetic field sensor system set up with different relative orientations of analyzers and polarizers. The paper analyzes linearity ranges of different materials and their sensitivity for different wavelengths. Terbium doped glass (TDG), terbium gallium garnet (TGG), doped TGG and dense flint glass materials are used for analysis based on Faraday's rotation principle. TGG shows high Faraday rotation, temperature stability and high optical quality. Three ranges of the magnetic field have been chosen for performance analysis. The study reveals that doping of praseodymium (Pr3+) on TGG exhibits a better response at 532 nm as well as 1064 nm wavelengths than TGG. At 632.8 nm wavelength, cerium (Ce3+) doped terbium aluminum garnet (TAG) ceramic exhibits better resolution than others. The study has been done for performance analysis of different MO sensors applicable for measurement of various process parameters like current, displacement, and magnetic field.
Highlights
This article is based on analysis of linearity and sensitivity of different magneto-optic (MO) materials
At 532 nm wavelength, a 30 % increase in sensitivity can be achieved with doping of a Pr3+ rare earth ion on terbium gallium garnet (TGG)
It is observed that a 57 % increase in sensitivity can be achieved with doping of a Pr3+ rare earth ion on TGG at 1064 nm wavelength
Summary
This article is based on analysis of linearity and sensitivity of different magneto-optic (MO) materials. Faraday rotation of rare earth garnet material is usually inversely proportional to the wavelength of light, except for yttrium iron garnet (YIG), where the Verdet constant increases above 1300 nm wavelength (Booth and White, 1984). Several studies are reporting on MO material development and its properties (Munin et al, 1992; Chen et al, 2016a, b; Booth and White, 1984; Chakraborty and Bera, 2008; Chakraborty and Kumari, 2015) In this context, analysis of sensitivity can be regarded as one of the important performance criteria in sensor design. In this paper we are focusing on various MO materials at different wavelengths and analyzing the sensitivity of a basic magneto-optic setup under different relative orientations of polarizer and analyzer
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