Mr. Jared Wheeler Profile

Jared Wheeler

at 4D Technology Corp

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Proceedings Article | 5 March 2021 Open Access

4D Technology Corp.: Measuring Large Optics Easily

Edgar Schrock, Jared Wheeler

Proceedings Volume 11716, 1171601 (2021) https://doi.org/10.1117/12.2595941

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https://www.4dtechnology.com email: 4dinfo@ontoinnovation.com Phone: +1 520-294-5600. Measuring meter-class spherical optics like astronomical telescopes and space telescopes can be difficult because large turbulent air cavities and the sheer size of the optics can make vibration isolation impossible. That's where dynamic interferometers make metrology possible. This demo in our lab shows how a measurement of an optic that is widely separated, not vibration isolated and with turbulent air is easy, because the small, light PhaseCam laser interferometer is easy to align--even if the optic is not. PhaseCam is a Twyman-Green interferometer, which means that it's light output is well-conserved in the process -- providing a strong laser source for illumination and bright, high contrast interference fringe generation. Its operating range is meters from the instrument. PhaseCam 6110 has a 6 megapixel imaging camera and high quality optics, allowing for excellent spatial resolution across the data set. Its dynamic, single-frame acquisition, using 4D Technology's patented polarization technique means that acquisition speeds are only limited by exposure time, and are measured in microseconds. The Twyman-Green format makes the instrument ideal for measuring surface shape of spherical optics, of any size, and with highest precision.

Proceedings Article | 3 September 2019 Presentation + Paper

3D shop floor characterization of radii and chamfers

Erik Novak, Kramer Lindell, Jared Wheeler

Proceedings Volume 11102, 1110212 (2019) https://doi.org/10.1117/12.2530693

KEYWORDS: 3D metrology, Structured light, Cameras, Fringe analysis, Polarization, Imaging systems, Polarizers, Interferometry, Visualization, Projection systems

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The sharp edges of most precision machined surface must be ‘broken’, which involves rounding them or adding a flat chamfer. Part longevity, human safety during handling, and proper performance of the component is the intended application of this edge breaking. Traditional visual inspection or single-trace metrology is insufficient to assure parts are within specifications. This paper will present a handheld, 3D-measurement device using polarized structured light which allows for rapid, simple, shop-floor measurement of edge break, chamfer angles, and other precision part geometries. A variety of component measurements will be presented along with studies on accuracy, repeatability, and reproducibility in real-world environments.

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