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Testing and inspecting lens by holographic means
| Details |
Inventors: Hildebrand, Bernard P.;
Assignee: The Unites States of America as represented by the Secretary of the Army (Washington, DC)
Primary Examiner: Corbin; John K.
Assistant Examiner: Clark; Conrad
Attorney, Agent or Firm: Edelberg; Nathan, Gibson; Robert P., Suga; Arthur M.
Processes for the accurate, rapid and inexpensive testing and inspecting of oncave and convex lens surfaces through holographic means requiring no beamsplitters, mirrors or overpower optics, and wherein a hologram formed in accordance with one aspect of the invention contains the entire interferometer and serves as both a master and illuminating source for both concave and said convex surfaces to be so tested. |
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DETAILED DESCRIPTION I claim: 1.
In a process for holographically testing concave and convex surfaces wherein a hologram serves as both a master and an illuminating source for said surfaces to be tested, said process requiring no overpower optics, mirrors or beamsplitters, said process of making a hologram of a master surface comprising the steps of illuminating said master surface with a first beam of coherent light diverging from a point near the focal plane of said master surface through a photographic plate, said photographic plate being further illuminated with a second coherent beam of arbitrary curvature, forming a plurality of holograms on said photographic plate including a transmission hologram of said first beam by interference of said first and second beams, and a reflection hologram of a third beam comprising said first beam reflected from said master surface, by interference of said second and third beams, placing said photographic plate containing said reflection and transmission holograms before a concave or convex surface for holographically testing the surfaces thereof.
2.
The process as described in claim 1 wherein said transmission hologram is formed by said first and second beams interfering in said photographic plate, and said reflection hologram is formed by said second and third beams interfering in said photographic plate.
3.
The process as described in claim 2 wherein said surface to be tested is concave and comprising the steps of replacing said master surface with said concave surface of substantially equal curvature, illuminating said photographic plate with a fourth beam replicating said second beam, said transmission hologram in said photographic plate reconstructing a fifth beam replicating said first beam, said fifth beam striking said concave surface and reflecting from said surface back through the photographic plate as a sixth beam, said reflection hologram in said photographic plate reconstructing a seventh beam replicating said third beam, and viewing said sixth and seventh beams on a viewing screen indicating interference fringes representing differences between said master and concave surfaces
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