| 摘要 |
<p>The detector has a channel separation unit (36) which performs channel separation between transmission channel for transmitting unit (10) and receiving channel for receiving unit (16). A passive optical element (38) on channel separation unit, has a monitoring unit (20) for monitoring light beam (28). A windscreen (22) has a primary region in which transmitted radiation (12) from the transmitting unit is applied on front windshield, and secondary region in which transmitter radiation (18) reflected from monitoring area impinges on the front windshield.</p> |
