Developing new products is an expensive and time consuming process for automotive companies. advances in optical sensors, computer graphics, and robotics provide new technology for the processes in styling, design, an...
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Developing new products is an expensive and time consuming process for automotive companies. advances in optical sensors, computer graphics, and robotics provide new technology for the processes in styling, design, and quality management. They are used in optical inspection and reverse engineering to speed up the development process. One of the challenges of these new technologies for DaimlerChrysler is the coupling to current CAD systems. The 3D data obtained from fast optical sensors have to be post-processed before they can be transferred to a commercial Computer Added Design (CAD) system due to data format and amount of the measured data. But reducing the measured data can remove important information or lower the accuracy of the data. This paper describes current and two new reduction algorithms for optical 3D data. It illustrates the need of data reduction in an application: A historic Mercedes-Benz racing car is measured by a optical sensor delivering 98.3 million points. The are reduced down to 1 million points for reverse engineering of the car body surface.
An ultra-high density optical memory using near field optics has been attracting much interest for future datastorage. Betzig and coworkers (1992) demonstrated optical recording by an optical scanning microscope (NSO...
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Literally hundreds of parameters have been specified for measuring Compact Disc (CD) and Digital Video Disc (DVD) characteristics but virtually none for drive performance. For the hundreds of optical disc characterist...
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Literally hundreds of parameters have been specified for measuring Compact Disc (CD) and Digital Video Disc (DVD) characteristics but virtually none for drive performance. For the hundreds of optical disc characteristics, there are many differing methods for measuring each one. After having chosen the `best' methods for measuring the disc characteristics and conducting the measurements, conformance to the industry specifications (de-facto standards) must be judged. The practical relevance of the relationships between disc parameters, measurement methods, and drive performance must be understood and managed such that the value experienced by the customer is preserved.
In DOW type of phase change optical memories the focus has been mainly an gestate based systems due to their good overwriting capability and very high order cyclability. To avoid the material deterioration problems su...
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ISBN:
(纸本)081943292X
In DOW type of phase change optical memories the focus has been mainly an gestate based systems due to their good overwriting capability and very high order cyclability. To avoid the material deterioration problems such as material flow, high melting point, high viscosity or high-density components such as CrTe, (which have the same refractive index) can be added to the active layer. This has led to an improved performance of overwrite cycles from 10(5) to 10(6). Material flow occurs due to void formation. Voids and sinks are formed due to porosity of the active layer because the active layer has a density lower than that of the bulk material. One of the reasons for the formation and coalescence of voids is the way in which the film is deposited viz. Sputtering which makes Ar atoms accumulate in the films during deposition. Also the mechanical strength of the protective layers effects the repeatability of the active layer. All the above mentioned processes occur during melting and re-solidification of the nano-sized spots which are laser irradiated. Since the structure of the protective layers is very important in controlling the void formation, it is very important to study the thermal modeling of the full layer structure. In the past models have been developed to see the temperature profile of the magneto-optical discs by finite difference methods using Alternating direction Implicit (ADI) technique. The temperatures achieved during laser irradiation in MO discs are much lower than the melting points of any of the layers and hence no question of phase transition. Whereas in phase change type of opticaldatastorage media, the short pulse layer beam melts and re-solidifies the nano-sized spot during repetitive cycles of irradiation. Also the protective layers at the points of the laser irradiation are prone to change shape due to such high temperatures. The laser beam irradiating the phase change disc is considered to have Guassian profile. For this electromagnetic
The conventional inspection methods for the write-once optical disk are consist of visual method with non-destructive and recording/playback of the sampled disks with destructive. So the quality can not be assured whe...
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The conventional inspection methods for the write-once optical disk are consist of visual method with non-destructive and recording/playback of the sampled disks with destructive. So the quality can not be assured when arrived at the customer due to lack of quality inspection. We find the new method consist of recording/playback for each disk manufactured. The recording/playback is performed at the edge area of the disk where tracks are extended. This area is not conflict with the standard and the disk can be used as a virgin disk at the customer. From the experiment, we find that the ratio of bad disks can be reduced to 0.5% from 7% with proposed method.
Active microelectronic DNA arrays are presently being used for genomic research and diagnostics. These arrays transport charged DNA molecules to specific microscopic sites. These devices can serve as "host substr...
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A brief history of the evolution of the compact disc is presented. The central focus is on the development role played by the Red Book and its offspring, the Yellow Book and the Orange Book. Following the development ...
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A brief history of the evolution of the compact disc is presented. The central focus is on the development role played by the Red Book and its offspring, the Yellow Book and the Orange Book. Following the development of the disc itself came longevity claims made by manufacturers and counter claims in commercial literature. Finally, the construction of technically and statistically sound media testing methodology is traced from the early works of individuals to the refined standards representing the combined input from manufacturers, archivists and industry experts. A suggestion for further independent testing is also made.
Smart pixel array module (SPAM) technology was used to develop free space optical interconnects designed to address interconnect density bottlenecks due to very high data throughput applications. The SPAM technology c...
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Smart pixel array module (SPAM) technology was used to develop free space optical interconnects designed to address interconnect density bottlenecks due to very high data throughput applications. The SPAM technology consists of three main components, namely, a two dimensional optoelectronic array of emitters and photodetectors, a matching electronic ASIC, and an optional passive optics device that maybe required to condition and route the optical input/output beams. The resulting SPAM is a 2D optical transceiver module that has limited number of electrical I/Os.
Characterization methods of AgInSbTe based phase change optical disc are developed. Reflectivity change of as deposited multilayer structure with changing thickness is measured. The active layer thickness influence on...
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Characterization methods of AgInSbTe based phase change optical disc are developed. Reflectivity change of as deposited multilayer structure with changing thickness is measured. The active layer thickness influence on reflectivity is compared with calculated results. We show that Rutherford Back Scattering (RBS) spectroscopy can be used to analyze the composition of the active layer. The X-ray diffraction pattern of CD-RW discs is presented, for both as deposited and initialized case. The TEM image reveals the particular crystal growth mechanism of AgInSbTe quaternary system. Written discs write power window is shown at 2X and 4X write speed.
Conjugated organic chromophores with large two-photon absorption cross-sections have been developed and employed to prepare highly-sensitive nonlinear photopolymer systems, which can be used for 3D-microfabrication an...
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