26 June 2017 3D geometry measurement of hot cylindric specimen using structured light
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Abstract
We present a fringe projection system to measure glowing hot hybrid components in between production processes. For this a high power green light projector, based on TI DLP technology, is used to create the highest possible contrast between fringes on the red glowing specimen. It has a resolution of 1140 x 912 pixels with a maximum frame rate of 120 images per second for fast measurement. We use a green bandpass filter (525 nm) on the camera lens to block unwanted incoming radiation from the specimen caused by self-emission. Commercial measurement standards are not calibrated for temperatures other than 20° C, so they cannot be used to validate measurement data at the required temperatures of up to 1000°C since thermal expansion invalidates the geometry specification from the calibration data sheet. In our first development we use a uniformly heated pipe made of stainless steel as a dummy specimen to examine the measured geometry data. A pyrometer measures the temperature of the pipe so the expansion can be easily calculated using the thermal expansion coefficient. Different impact and triangulation angles are investigated to identify the effects of hot ambient air on the measurement. The impact of the induced refractive index gradient is examined to check the need for pre-processing steps in the measurement routine.
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Lorenz Quentin, Lorenz Quentin, Rüdiger Beermann, Rüdiger Beermann, Andreas Pösch, Andreas Pösch, Eduard Reithmeier, Eduard Reithmeier, Markus Kästner, Markus Kästner, } "3D geometry measurement of hot cylindric specimen using structured light", Proc. SPIE 10329, Optical Measurement Systems for Industrial Inspection X, 103290U (26 June 2017); doi: 10.1117/12.2269607; https://doi.org/10.1117/12.2269607
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