28 April 2009 Design and implementation of a new time-delayed source and alignment considerations for a tangent ogive interferometer
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Proceedings Volume 7302, Window and Dome Technologies and Materials XI; 730215 (2009); doi: 10.1117/12.818385
Event: SPIE Defense, Security, and Sensing, 2009, Orlando, Florida, United States
Abstract
A new Time Delayed Source (TDS) has been designed to work with a transmitted wavefront interferometer. The TDS splits a short-coherence wavelength source into two halves, introduces a time delay between the two halves and then recombines the two halves. The recombined wavefronts are fed into a transmitted wavefront interferometer to measure the optical path difference (OPD) between the two surfaces of a part. The time delay is adjusted to match the separation between the two surfaces of the part allowing phase shifting techniques to be used to measure the OPD. The measurement approach can be adapted to measure nominally constant thickness windows, spherical domes and tangent ogives through the design of suitable wavefront matching optics. Producing the wavefront to measure a tangent ogive is accomplished by a series of sub-apertures, each measuring a section of a tangent ogive. The tangent ogive is placed on a rotary stage, and as it rotates, sub-aperture measurements are taken and later stitched together to generate a complete measurement of the part. Alignment of each sub-aperture instrument is essential to obtain an accurate measurement. The setup and alignment of a tangent ogive transmitted wavefront interferometer is also described.
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Hector P. Durazo, William P. Kuhn, Robert S. LeCompte, Matthew B. Dubin, "Design and implementation of a new time-delayed source and alignment considerations for a tangent ogive interferometer", Proc. SPIE 7302, Window and Dome Technologies and Materials XI, 730215 (28 April 2009); doi: 10.1117/12.818385; https://doi.org/10.1117/12.818385
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KEYWORDS
Interferometers

Wavefronts

Domes

Prototyping

Computer aided design

Optical alignment

Space telescopes

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