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January 25, 2013
Abstract
Optical sensors offer the possibility to assist quality control by enabling a fast and reliable detection and a directed action if relevant workpiece properties breach the tolerance range. Especially due to their non-tactile operation it is guaranteed that surfaces are not damaged. In this contribution concepts for a near-production monitoring with optical sensors are proposed. Advantages and shortcomings of these approaches are discussed and initial implementations are presented.
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January 25, 2013
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For the purpose of large-area, low-cost and flexible pressure sensors, piezoresistive polymer composites with conducting filler particles exhibit a promising sensor concept. Currently these material systems usually contain carbon black as filler particles. By using composites based on carbon nanotubes (CNT), it is possible to achieve a comparable force dependent resistance behaviour, which however results in reduced filler fraction. This paper presents a flexible, printable, piezoresistive CNT-elastomer-composite as well as its sensor concept, its material selection, its fabrication and its characterisation in compressive tests.
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January 25, 2013
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Environmental vibrations are always problematic in surface metrology. For this reason an active damping of measurement setups is an important component for a high measurement quality. As an example the practical realization of the damping of a White Light Interferometer (WLI) is presented here. A quadrature interferometer (QI) serves as reference measurement device which detects the vibrations between the measurement head and the measurement table. A closed loop control algorithm uses this information and delivers an actuating signal for the stabilization of the measurement head by means of a piezoelectric element.
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January 25, 2013
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The method presented enables a Particel Image Velocity (PIV) system with moderate sampling rates to achieve the time-resolved presentation of instationary phenomena with high frequencies. Therefore the method determines the phasing of the phenomena via wavelet transform for each PIV-measurement. The measurements can be arranged according to their phasing and represent the development of the phenomena over one periode in time. The method is tested for the phenomenon of the Kármán vortex street.
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January 25, 2013
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In this contribution we present a waveguide-based approach for the determination of highly absorbing, transversely isotropic polymers for numerical simulation purposes. Based on a multimodal simulation of wave propagation the directional as well as frequency dependent acoustic properties are computed within an inverse problem.
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January 25, 2013