| 摘要 |
An optical system and method for detecting the presence and location of multiple objects in a field. The optical system has at least one light source (20) to generate a beam, which beam is scanned by at least one first reflecting surface (40) to generate at least three sets of beams. A first and second set of beams are overlapped across the field by at least one second reflecting surface (60) and a third set overlaps the field without the second reflecting surface. The beam intensity is measured by at least one detection means. |
