Laser interferometric measurement of spherical surface contours
Abstract
A laser interferometer was made operational for alignment of highly reflective spheres in a laser surface inspection system and for semi-automated measurement of roundness and waviness amplitude of the spherical surfaces. The noncontact interferometric measurements of roundness agree with conventional measurements made with a stylus. The theoretical foundation was developed for a computer program to perform semi-automated measurement of waviness wavelength associated with the measured waviness amplitude. Theory was developed for using the interferometer to position the center of a sphere on a rotation axis when the laser beam is accessible to only one-quarter revolution of the spherical surface about this axis.
- Publication:
-
NASA STI/Recon Technical Report N
- Pub Date:
- February 1979
- Bibcode:
- 1979STIN...7928544K
- Keywords:
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- Contours;
- Interferometry;
- Laser Applications;
- Spectral Reflectance;
- Spheres;
- Computer Programs;
- Rotation;
- Wave Reflection;
- Lasers and Masers