| 摘要 |
An optical e.g. laser triangulation sensor is disclosed in which a configuration of an output light beam is controlled using a mask (19) in front of a light source. The configuration may include a plurality of coplanar spatially separated planar light beams. The mask may be movable to provide different light beam configurations. Masking parts of the light beam enables unwanted features on the measurement surface to be omitted. Also disclosed is a guide element (200) for an optical sensor for facilitating hole diameter measurement. The guide element has contact surfaces (212, 214, 216) lying on a virtual conical surface which abut the hole edge to enable consistent placement of the light beam with respect to the hole centre. Also disclosed is a guide element (300) for an optical sensor having an aperture for framing surface features (e.g. rivet) to permit accurate location of the light beam therewith.
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