| 摘要 |
There is provided an optical window contamination detecting device capable of detecting even microscopic contamination attached onto an optical window with a limited number of contamination detecting sensors. An optical window contamination detecting device for a scanning type distance measuring apparatus includes a casing 101 formed with an optical window 102, the casing accommodating therein a light transmitting unit 3, a scanning mechanism 4 for deflection scanning measurement light output from the light transmitting unit 3 into a measuring space through the optical window 102, and a light receiving unit 5 for detecting reflected light from an object through the optical window 102. The optical window contamination detecting device includes a plurality of reflection photoelectric sensors 1 arranged along the optical window 102 on an outer side of the optical window 102; and a retro-reflective member 2 attached to the scanning mechanism 4, the retro-reflective member 2 for reflecting detection light from the reflection photoelectric sensor 1 having passed through the optical window 102 towards the reflection photoelectric sensor 1. |
