Compensation of light intensity across a line of light providing improved measuring quality
AssigneeHexagon Technology Center GmbH
InventorsPeter Kipfer, Johan Stigwall, Thomas Jensen
Life of this patent
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Abstract
Method of providing measuring light for triangulation-based distance measurement to an object to be measured, wherein distance information is derivable by detecting at least portions of the measuring light reflected at the object. The method comprises emitting light and shaping the light so that the measuring light is provided in form of a line having a midpoint and two opposite ends. The intensity distribution of the light across the line is adjusted so that a respective light intensity at the ends of the line is at least 10% higher than light intensity around the midpoint.
Claims16
A method of providing measuring light, for triangulation-based distance measurement to an object to be measured, wherein distance information is derivable by detecting at least portions of the measuring light reflected at the object, the method comprising:
- emitting light, and
- shaping the light so that the measuring light is provided in form of a line having a midpoint and two opposite ends, wherein:
- adjusting the intensity distribution of the light across the line so that a respective light intensity at the ends of the line is at least 10% greater than light intensity around the midpoint, and
- shaping the light is provided by means of a first micro-lens array and a fast axis aperture stop.
A light emitting unit, in particular of or for a triangulation-based distance measuring device, for providing defined measuring light, in particular laser light, the light emitting unit comprising:
- a light source for emitting light, in particular a laser light source for emitting laser light, and
- a beam forming assembly for shaping the light by affecting propagation of the light emitted by the light source, wherein the beam forming assembly is arranged and designed so that measuring light is provided in form of a light line having a midpoint and two opposite ends, wherein:
- the light source and the beam forming assembly are arranged and designed so that an intensity distribution of the light across the line is adjustable such that a respective light intensity at the ends of the line is at least 10% greater than light intensity around the midpoint, and
- the beam forming assembly comprises a first micro-lens array and a fast axis aperture stop.
Dependencies are inferred from the claim text.