Richard C. Windecker

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A new semispatial, robust, and accurate phase evaluation algorithm for spatial carrier fringe measuring systems is presented, which is a combination of a temporal algorithm and a spatial algorithm in order to use the advantages of both methods. Only two to four frames are needed for operation. A new interlaced detection mode is also presented. Thus the time(More)
The characterization of roughness of engineering surfaces over an area is an important task for different applications as well as for manufacturing processes. The surface roughness is in particular an important factor in determining the performance of a workpiece. We demonstrate that the fringe projection technique allows very fast three-dimensional surface(More)
Scanning white-light interferometry is widely used for the microstructure analysis of technical and biological specimens. For each pixel in the focal plane of the apparatus a white-light interferogram is acquired and evaluated by means of an algorithm. We discuss some properties of mathematically optimal evaluation methods and the best possible achievable(More)
We describe a compact fiber-optic setup for three-dimensional topometry. The measuring principle is based on low-coherence interferometry in combination with a confocal microscope. Integrating an optical arrangement based on compact disk optics together with fiber optics into one sensor yields a compact unit. The sensor has a numerical aperture of 0.45 and(More)
We showed in previous work how complex stochastic automata can be constructed from simple stochastic parts networked together. Here, we apply this modeling paradigm to create model automata that can mimic some aspects of the random walks animals make as they search for food or prey. We call these models Stochastic Artificial Neural Networks (ANNs). We focus(More)
The microstructural inspection of engine cylinder walls is an important task for quality management in the automotive industry. Until recently, mainly tactile methods were used for this purpose. We present an optical instrument based on microscopic fringe projection that permits fast, reliable, and nondestructive measurements of microstructure. The field of(More)
Confocal microscopy and white-light interferometry are two promising methods for the three-dimensional microstructure analysis of technical and biologic specimens. For both methods the specimen is scanned through the focus position by means of an actuator. A large series of intensity frames is acquired. These data are used for the final calculation of the(More)