Method and apparatus for the real time determination of deformation of test pieces
OwnerBernward Mähnerinventor
Life of this patent
Estimating the term…
Abstract
A method and a measuring system capable of real-time pickup of deformation images of a surface of a test object is provided. A plurality of mutually phase-shifted interferograms are generated. From these interferograms, a normalizing mask, which is stored in memory as a normalization data set, and a reference imageare generated. Next, each speckle image generated is processed with the reference image to form a differential image that is linked with the normalizing mask. The normalizing mask can include a data set with pixel-specific normalization data. The pixels of the differential image are then divided by the respectively associated values of the normalization data set in order to generate a normalized stripelike image of the deformed surface.
Claims33
A method of ascertaining and displaying deformations in or displacements of test objects in real time, comprising the steps of:
- in an initial step sequence, producing a normalization data set, IA(x,y), containing normalization information for each pixel (x,y) of an image of a test object based on a variance in a brightness of each pixel;
- generating, based on at least two successively picked up images R(x,y), B(x,y) made up of pixels (x,y), a differential image D(x,y);
- and
- correcting the brightness values of the pixels (x,y) of the differential image D(x,y) using the normalization data set IA(x,y).
A measuring system capable of ascertaining and displaying deformations in or displacements of test objects in real time, comprising:
- a pickup unit, which detects a pattern that is dependent on the surface form and/or surface properties of a test object, and which generates signals corresponding to the pattern, signals being dependent on a deformation and/or shift in the surface of the test object;
- an image processing unit, comprising a computation unit and a memory unit, the image processing unit generating, from a first image or a first series of images, a normalization data set IA(x,y) for each pixel in the image based on a variance in a brightness in each pixel, which is stored in the memory unit and with which the computation unit combines each further image B(x,y) point by point;
- and
- a display device, on which images picked up by the pickup unit and post-processed by the computation unit are displayed.
Dependencies are inferred from the claim text.