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Experimental Layout for Investigating Temperature Dependednce of the Vibration Plane Rotation in Some Identified Mineral and Vegetable Oils
並列摘要
This study presents results of a recent study done in Norway from Bergen University, to determine temperature dependence of linear birefringence in mineral oil and linear and induced birefringence in vegetable oils. The study was done between the temperature range of 6 and 45ºC in magnetic field up to 140 mT. It found the intrinsic birefringences responsible for optical activity in vegetable oils with impurities and all mineral oils. The results of optical activity in both oils obeyed the equation f=A+a_w (1) where aw is the angle at which minimum irradiance I_(min) occurs in water and other substances which are optically inactive. Heavy oils like red diesel, Esso diesel and Fina diesel No. 2 rotate more the vibration plane and they possess more intrinsic birefringences than light diesel. The research team found that the temperature effect on rotation in both mineral and vegetable oils with impurities, yielded results that obeyed the equation f_1=A-bT (3) where b is positive. In vegetable oils for human consumption, application of magnetic field causes induced birefringences responsible for f given byf_2=VHL+a_w (4) where V is Verdet's constant in rad TG1mG1 and H is the magnetic field intensity in Am-1. Also the temperature dependence on rotation in vegetable oils free from impurities obeyed the relationship given by equation=VHL-bT (5). This method can be used to determine the level of refinement of mineral and vegetable oils.
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