US3897995A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for performing holographic interferometry
Assignee: GCO Inc
•
Filing: 1973-11-01
•
Granted: 1975-08-05
•
Expires: 1993-11-01
Abstract
Abstract To perform holographic interferometric analysis of the deformation of a relatively small section of a larger surface, the section is first painted with retro-reflective paint and a photographic plate is supported parallel to and closely spaced from said section. The light beam from a laser is passed through a diverging lens onto the photographic plate to illuminate the section, thereby exposing the photographic plate to direct illumination from the beam and to reflected radiation from the section. The laser is energized for a short time to expose the plate and the member is then loaded to deform the surface. After the loading the laser is again energized to make a second exposure on the plate. After development of the plate the plate is illuminated with an intense source of light to reconstruct wave-fronts representing an image of the section having fringe lines superimposed thereon and arrayed as a function of the deformation of the member between the two exposures.
Inventors
- 👤 Robert C Penn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 20:24
CPC Classifications
G; G01; G01B; G01B9/00; G01B9/02; G01B9/021
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
88 words
The method of forming a hologram of a section of the surface of a member comprising: supporting a radiation sensitive recording media on said member by means of a support fixed to said member externally of the section so that a portion of said media extends in close spaced relation to said section; illuminating said section with coherent radiation passed through said media so that said media is exposed to and records the interference pattern created by direct coherent radiation and coherent radiation reflected from said surface section.
Claim 2
Independent Claim
88 words
The method of forming a hologram of a section of the surface of a member comprising: supporting a radiation sensitive recording media on said member by means of a support fixed to said member externally of the section so that a portion of said media extends in close spaced relation to said section; illuminating said section with coherent radiation passed through said media so that said media is exposed to and records the interference pattern created by direct coherent radiation and coherent radiation reflected from said surface section.
Claim 3
Dependent Claim
38 words
The method of claim 1 wherein said section of the surface has a generally planar extension, the radiation sensitive media has a generally planar extension and the media is supported in generally parallel relationship to said planar section.
Claim 4
Dependent Claim
32 words
The method of claim 1 wherein the radiation sensitive media is supported by a plurality of support members fixed to the member at spaced points arrayed about said section of the member.
Claim 5
Dependent Claim
21 words
The method of claim 1 wherein the radiation sensitive media consists of a photographic emulsion formed on a transparent support member.
Claim 6
Dependent Claim
14 words
The method of claim 4 wherein said support member consists of a glass plate.
Claim 7
Dependent Claim
17 words
The method of claim 1 including the step of coating said surface section with a retro-reflective material.
Claim 8
Dependent Claim
12 words
The method of claim 1 wherein the radiation sensitive media is photochromic.
Claim 9
Independent Claim
125 words
The method of recording and reconstructing the wave-fronts reflected from a section of a surface of a body illuminated with light from a laser, comprising: supporting a light sensitive recording media on a plurality of support members fixed to the member about said section so that a portion of said media is supported in spaced relationship to said section of the surface; illuminating said section of the surface with light derived from a laser and passed through said media so that said media is exposed to light from the laser and light reflected from said section; developing the media to form a hologram; and illuminating the hologram with light from a source less coherent than the laser to reconstruct the wave-fronts reflected from the surface.
Claim 10
Independent Claim
125 words
The method of recording and reconstructing the wave-fronts reflected from a section of a surface of a body illuminated with light from a laser, comprising: supporting a light sensitive recording media on a plurality of support members fixed to the member about said section so that a portion of said media is supported in spaced relationship to said section of the surface; illuminating said section of the surface with light derived from a laser and passed through said media so that said media is exposed to light from the laser and light reflected from said section; developing the media to form a hologram; and illuminating the hologram with light from a source less coherent than the laser to reconstruct the wave-fronts reflected from the surface.
Claim 11
Dependent Claim
26 words
The method of claim 8 wherein said surface section has a generally planar disposition and the radiation sensitive media is supported parallel to said surface section.
Claim 12
Independent Claim
111 words
The method of analyzing the deformation of a section of the surface of a member between first and second times, comprising: supporting a radiation sensitive recording media on said member at points external of said section so that a portion of said media extends in spaced relationship to said section; illuminating said section with coherent radiation passed through said media so that said media is exposed to said coherent radiation and radiation reflected from said section; reconstructing the wave-fronts from said hologram with a radiation source; coherently superimposing the wave-fronts reconstructed from said hologram with wave-fronts reflected from said section at a second time, while it is illuminated with coherent radiation.
Claim 13
Independent Claim
111 words
The method of analyzing the deformation of a section of the surface of a member between first and second times, comprising: supporting a radiation sensitive recording media on said member at points external of said section so that a portion of said media extends in spaced relationship to said section; illuminating said section with coherent radiation passed through said media so that said media is exposed to said coherent radiation and radiation reflected from said section; reconstructing the wave-fronts from said hologram with a radiation source; coherently superimposing the wave-fronts reconstructed from said hologram with wave-fronts reflected from said section at a second time, while it is illuminated with coherent radiation.
Claim 14
Dependent Claim
41 words
The method of claim 10 wherein second wave-fronts are derived from a second hologram formed on said radiation sensitive media by exposing said media to coherent radiation reflected from said surface section and directly from the source at said second time.
Claim 15
Dependent Claim
22 words
The method of claim 10 wherein said second wave-fronts are created in real time by illumination of said section with coherent radiation.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-08-04 | 1979-02-03 | 1979-08-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-08-04 | 1983-02-03 | 1983-08-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-08-04 | 1987-02-03 | 1987-08-05 | $7700.00 | Window Closed / Lapsed |