15 November 1983 Design and Operation of a Real Time Interferometer Working at 3.8 µm
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Abstract
A digital heterodyne interferometer has been designed and constructed to operate at a wavelength of 3.8 μm. The instrument is intended for use in measuring wavefront figure error due to thickness variations in dielectric coatings applied to infrared optics. A 32 x 64 element PtSi infrared CCD detector array is used together with digital processing and graphics display on a desktop microcomputer. Preliminary results have shown a wavefront measurement repeatability of less than λ/50.
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K. Prettyjohns, S. DeVore, E. Dereniak, J. Wyant, "Design and Operation of a Real Time Interferometer Working at 3.8 µm", Proc. SPIE 0429, Precision Surface Metrology, (15 November 1983); doi: 10.1117/12.936352; https://doi.org/10.1117/12.936352
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