Reflection light scanner for detecting objects in monitoring range

摘要

The scanner (1) has near and far elements, so that for the adjustment of the scanning ranges defining the monitoring range, the scanning range of the transmitting light beam is aligned on a test object. Several scanning ranges are provided, the setting of which is adjusted successively for respective test objects arranged at different distances. Two different scanning ranges are provided, which define the monitoring range at close range or far away. The generated reception signals are adjusted automatically according to a ratio corresponding to the switch-point of the reflection light scanner, at the near and far elements using an adjustable resistance element). Adjusting operation is carried out across an externally operated signal line, according to main Patent DE 19707861.3-52.