Front lighted optical tooling method and apparatus
An optical tooling method and apparatus uses a front lighted shadowgraphic technique to enhance visual contrast of reflected light. The apparatus includes an optical assembly including a fiducial mark, such as cross hairs, reflecting polarized light with a first polarization, a polarizing element backing the fiducial mark and a reflective surface backing the polarizing element for reflecting polarized light bypassing the fiducial mark and traveling through the polarizing element. The light reflected by the reflecting surface is directed through a second pass of the polarizing element toward the frontal direction with a polarization differing from the polarization of the light reflected by the fiducial mark. When used as a tooling target, the optical assembly may be mounted directly to a reference surface or may be secured in a mounting, such as a magnetic mounting. The optical assembly may also be mounted in a plane defining structure and used as a spherometer in conjunction with an optical depth measuring instrument.
- DOE Contract Number:
- AC04-76DP00613
- Assignee:
- Dept. of Energy
- Application Number:
- ON: DE84011108
- OSTI ID:
- 6829627
- Country of Publication:
- United States
- Language:
- English
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Front lighted shadowgraphic method and apparatus
Front lighted shadowgraphic method and apparatus