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A technique for simultaneous independent measurement of temperature and magnetic field in a Faraday-effect magnetometer is presented. The technique is based on interferometric phase measurement of temperature combined with magnetic-field-induced visibility modulation of the interferometric fringes. The technique is demonstrated using a paramagnetic FR-5 glass sensing element in a Michelson and a low-finesse Fabry-Perot configuration. The optical configuration is shown to be capable of remote operation using fibre-optic links. The measurement of temperature is shown to enable compensation of the scale factor for the temperature-dependent Verdet constant. Unlike in all previously reported techniques, the temperature is measured over exactly the same optical path as that subject to the magnetic field.
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Zaidi et al. (1994) studied this question.
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