Method and apparatus for determining deformation and elongation on curved bodies
AssigneeDr. Ettemeyer GmbH & Co.
InventorAndrea Ettemeyer
Life of this patent
Estimating the term…
Abstract
The present invention provides a method and associated apparatus with which it is possible to implement both shape detection and also displacement measurement in particular using partially identical working steps. A method according to the invention for determining the displacement of at least a part of the surface of a measurement object between an initial condition and a measurement condition and the shape of that surface of the measurement object is characterized in that the operation of determining the shape and the operation of determining the displacement are effected with the same measurement method using the speckle effect.
Claims35
A method of determining displacement of at least a part of the surface of a measurement object between an initial condition and a measurement condition and the shape of said surface of the measurement object, said method comprising:
- determining said shape and said displacement using the same measurement method, based on the speckle effect;
- and
- wherein the shape of the surface of the measurement object is determined based on two partial measurement operations, between which the object is left in the same condition and at least one viewing parameter is varied.
A measurement unit for three-dimensionally determining the shape and displacement of at least a part of the surface of a measurement object, comprising:
- a speckle interferometer having
- at least one laser,
- at least three different object illumination directions for propagation of object beams from said laser, and
- a camera having a light-sensitive surface;
- a calculation unit for evaluating signals from the camera;
- a display element for displaying evaluation results;
- and
- means for displacing by a defined amount at least two of said illumination directions, in the same direction with respect to a viewing direction of the camera.
A method of determining displacement of at least a part of the surface of a measurement object between an initial condition and a measurement condition, and the shape of said surface of the measurement object, said method comprising:
- determining said shape and said displacement, using the same measurement method, based on the speckle effect;
- wherein the shape of the surface of the measurement object is determined by
- illuminating the surface of the object with light beams;
- making at least first and second partial measurements based on light reflected from said surface;
- and
- leaving the object in the same condition between the first and second partial measurements, while altering at least one of an optical path of one of the light beams illuminating the surface of the object and reflected therefrom, a wavelength of the light beams.
Dependencies are inferred from the claim text.