This paper reports a new installation to measure optical activity of materials. The characteristics of this installation are: a magneto-optic device has two kinds of functions, first, modulating the light signal; second, making the vibration plane of polarized light rotate. By this way, the volume of the installation is reduced, no rotation mechanism is used, and the sensitivity of measurement is raised. On the other hand, a half-wave retardation plate is inserted in the light. By this wave plate we can not only remedy the defect of small linear range of magneto-optic element, but also can reduce the error of measurement by enlarging the angle of deflection, when we measure the little angle. Using program control DC supply as the linear scanning voltage, we can link the installation with computer and make the measurement automatic and fast.
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