Distance measuring apparatus

Abstract

Abstract PURPOSE:To make it possible to accurately detect the contamination of the optical system of a measuring part, by providing a means for detecting scattered beam from a beam emitting window. CONSTITUTION:A distance measuring apparatus has a laser diode 21 as a light emitting apparatus for emitting laser beam to an object to be measured and said laser diode 21 generates pulse like laser beam by high velocity pulse from a high velocity pulse generation circuit 23. This laser beam is outputted through a beam transmitting lens 25 and a beam emitting window 51. A light receiving element 39 for detecting contamination is arranged in close vicinity to the part slightly above the beam transmitting lens 25 so as to be positioned in the vicinity of the beam emitting window 51 through a cylinder 41 and the detection signal thereof is supplied to a display apparatus 45 through an amplifier 43. Reflected beam from the object to be measured is received by a beam receiving element 33 through a beam receiving window 53 and a beam receiving lens 31.

Inventors

• 👤 Hiroshi Kawada
• 👤 川田　博

Bibliographic Details