Optics: measuring and testing – By polarized light examination – With light attenuation
Patent
1992-02-26
1993-12-28
Evans, F. L.
Optics: measuring and testing
By polarized light examination
With light attenuation
G01B 1100
Patent
active
052744370
ABSTRACT:
The present invention relates to a procedure and a device for measuring a hollow space, preferably a tunnel, using a light-section device arranged on a cart and a video camera directed at this light-section device. A sharply defined profile plane is generated on the tunnel wall using a light plane radiated coplanar to a plate. This profile is recorded by the video camera together with a plum bob, a gauge and a counting device arranged in the area of the front wheel of the cart. By continuous movement of the cart, an uninterrupted image of the tunnel is generated. The position of the individual profiles in the hollow space is ascertained using a reference ray generated by a light source arranged and adjusted in the tunnel, with the reference ray generating a reference point that is constantly recorded by the camera on the plate.
REFERENCES:
patent: 4179216 (1979-12-01), Theurer et al.
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