Abstract
This paper presents a reflection device to measure three components of angular alignment, that is, pitch, yaw and roll with same sensitivity and simultaneity. Pitch and yaw components can be measured by usual arrangement of autocollimator, while roll component by the present device having a reflection mirror hung by thin leaf spring. The principle of the device is clarified by the analysis of the direction cosine. As one of practical problems of the device, the deflection of the spring under rolling is analized. A magnetic damper is used and its effect is checked in order to control a continuous and small vibration of the mirror. The following results are obtained by a few experiments: (1) The three components can be distinguished in the field of view of an autocollimator. (2) The sensitivity and linearity of the device is checked under rolling, changing a few parameters of length and thickness of the spring. The correction and calibration methods are also mentioned and determined. (3) The magnetic damper controls small vibration to be a noise of the reflection mirror and decreases it to 1/20.
