نتایج جستجو برای: dimensional measurement
تعداد نتایج: 825588 فیلتر نتایج به سال:
The number of the discrete samples for the dimensional measurement of machined surfaces and their coordinates is investigated. Counter to intuition, there need not be quadratically more samples than in the case for sampling lines or curves. To justify this novel scheme, accuracy is defined as the discrepancy of a finite point set. Then, from number theory, a particular sequence of numbers is us...
The main resolution limits in high-performance (S)TEM are due to the imperfections or ‘aberrations’ of the electron lenses. Correction of these aberrations requires the ability to quickly and accurately measure lens aberrations to align or ‘tune’ an aberration-corrector. The conventional method to measure aberrations in the TEM is to record a series of bright field (BF) images in a Zemlin table...
A geometric dimensional measurement system for form and position error detection of shearer rotational parts is developed in this paper with the error evaluation principle based on the minimum zone method. The system is characterized by using the charge coupled device (CCD) image sensor to capture image signals, and then using image processing techniques to extract useful signals from the image...
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