| 摘要 |
A shearing interferometer which includes a laser source, a reflector structure and an interference detection system. The reflector structure is mounted on an object, the angle of which, relative to a reference line, is to be determined. The reflector structure includes a transmission hologram and a retroreflector, wherein the transmission hologram is so constructed and positioned relative to the retroreflector that two or more parallel beams of preselected separation (shear) are produced for each incident beam. The difference in optical path length of a given pair of the parallel beams will vary depending on the object angle, and hence, the interference effect of the given pair of parallel beams will also vary in accordance with object angle. The interference effect is summed at a detector, and then analyzed by a tracking circuit to determine object angle.
|
