Solid state star scanner

摘要

A solid state optical scanner comprising a frequency generator that vibrates a sonic transducer which in turn sets up traveling waves in an acousto-optic medium. These waves form regions of compression and rarefaction in the medium causing the medium to act as a Bragg angle grating to an incident light source. Optical lenses and a photo detector are positioned behind the medium. Consequently, the light leaving the medium is diffracted into a single order and focused onto an image plane. A photodetector is placed at the image plane and the signal obtained is processed to develop information to determine the direction from the scanner to the incident light source.