Abstract
An electronic device for measuring the angle of rotation produced by optically active substances is described. Light, after passing through a continuously rotating polarizing element, is divided into two beams, one of which passes through the solution being tested. Each beam then passes through respective stationary polarizing elements and falls, as sinusoidally modulated light, upon respective phototubes, the output of each thereby being pulsating dc and passed as sinusoidal ac by its respective audio amplifier. Outputs of each channel are then fed to an electronic phasemeter which indicates the angular phase displacement produced by the optically active sample. A scheme for increased sensitivity involving a frequency multiplier in each electrical channel is proposed, and the possibility of adapting the arrangement to speed-of-light measurements is suggested.
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