Mr. Bryan R. Norman Profile

Bryan R. Norman

Optical Engineering Manager at L3Harris Technologies Inc

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Proceedings Article | 26 March 1992 Paper

Scanning Hartmann instrument

Richard Chase, Steven Keleti, Bryan Norman

Proceedings Volume 1618, (1992) https://doi.org/10.1117/12.58046

KEYWORDS: Mirrors, Sensors, Raster graphics, Interferometry, Scanners, Human-machine interfaces, Laser scanners, 3D scanning, Monochromatic aberrations, Solid state lasers

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Interferometry is not adequate for surface measurement of large mirrors during the early stages of figuring. Edges tend to roll off with errors of many waves, and these errors are undetectable with interferometry. The Hartmann test has become very important in providing surface information during these early stages, but unfortunately, data reduction is quite slow. Itek now has an instrument to automate the Hartmann test using a scanning laser beam and a solid state sensor. A narrow laser beam scans the testpiece in an appropriate raster. A solid state detector senses the reflected spot in the vicinity of the center of curvature. Knowing the positioning of the beam, and the position of the reflected spot is sufficient information for a mirror slope determination of that raster position. A computer program integrates the slope data to produce a surface wavemap of the testpiece. This wavemap can be displayed on a contour plot within a few minutes or routed to a computer controlled Milacron robot to appropriately refigure the testpiece. A null lens is unnecessary. The measurement accuracy of the instrument is about 1/5 to 1/2 waves surface rms

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