| 摘要 |
<p>A detector comprising object lenses (116 and 117) and photodetectors (PSD or PD) (118 and 119) for receiving the rays of light passing through the object lenses (116 and 117), wherein a plurality of fields of view are observed. The output signals from the photodetectors (118 and 119) are processed to detect changes in the quantity of light in a plurality of fields of view, or the displacement of the optical center of a field of view. This detection serves to find the appearance of objects that do not exist under the initial state.</p> |
