| 摘要 |
<p>The balance is fitted with an angle measuring device which consists of a light source, a polariser, an analyser and a photoelectric receiver; and its optical axis is coaxial with the axis of rotation of the balance arm. The light source, polariser and photoelectric receiver are mounted on a fixed component, and the analyser is mounted on the balance beam knife edge, or on a parallel guide for the balance scale, and the light source, polariser and photoelectric receiver are mounted on the balance frame; The polariser and analyser are disc-shaped polarisation filters mounted in a frame.</p> |
