Method and arrangement for measuring distance
AssigneeLimab Laser & Instrumentmekanik AB
InventorPer Nyquist
Life of this patent
Estimating the term…
Abstract
Method and arrangement for measuring distance, in which an area (5) on a measured object (2) is illuminated with light from a laser-light source (3). After reflection, the light reproduces the illuminated area on a detector arrangement (7), placed at the side of a line through the light source (3) and the illuminated area. The detector arrangement (7) consists of a number of detector elements (14). With the aid of a scanning device the image of the area (5) is scanned with respect to light intensity and the light intensity-dependent output signals from each of the detector elements obtained during scanning is accumulated in an evaluation device.
Claims11
A method of measuring a distance, comprising:
- illuminating an area of a measured object with light from a laser-light source which, after reflection, produces an image of said area on a detector arrangement located offset from a line through said laser source and the illuminated area;
- said detector arrangement comprising at least one line of detector elements;
- displacing said image of said area across said at least one line of detector elements;
- and
- sampling and accumulating a light intensity-dependent output signal from each detector element as the image is displaced.
An apparatus for measuring distance having a source for laser light which illuminates an area on a measured object and, after reflection, produces an image of the area on a detector arrangement having at least one line of detector elements, said apparatus comprising:
- a displacing device for displacing the image of the area across said at least one line of detector elements;
- and
- an evaluation device for sampling and accumulating said output signals from each said detector element obtained during displacing.
A method for measuring a position of a laser light beam reflected from an object, comprising the steps of:
- scanning said light beam across a detector array;
- and
- integrating signals from said detector array across the width of said light spot to average out speckle.
Dependencies are inferred from the claim text.