| 摘要 |
A moire optical transducer is described which has a minimal optical operating error. In normal moire grating sets, the lines of the gratings each inherently possess a periodic error in line spacing. This periodic error cannot be eliminated, but through the use of the instant invention, its influence on the optical operation of the transducer can be minimized. The stationary grating set has at least one window of grating lines. The length of the window is made to be a length which is a multiple of the length of the periodic error in the movable grating set. The net result is a decisive cancellation of a major portion of the error.
|
