US3785736A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Small-sized optical correlator
Assignee: Thales SA
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Filing: 1972-01-13
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Granted: 1974-01-15
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Expires: 1992-01-13
Abstract
Abstract The present invention relates to double-diffraction optical correlators. According to the invention there is provided a multi-channel optical correlator for shape recognition wherein the lenses and the filters are all constituted by patterns of fringes ; each channel is fed from a quasi-monochromatic and quasi-punctiform light source, which may be spatially incoherent.
Inventors
- 👤 G Bismuth
- 👤 E Spitz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 21:17
CPC Classifications
G; G02; G02B; G02B5/00; G02B5/32; G02B27/00; G02B27/42; G02B27/46; G06; G06E; G06E3/00; G06E3/001; G06E3/003
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
153 words
Double diffraction optical correlator including at least one correlation channel having an input and an output for delivering a signal indicative of the presence of at least one predetermined shape in an optical information support said correlator comprising : an emissive device supplying optical radiation to said channel input, a holographic converging lens associated with said channel, a filtering plane positioned across said channel, diffracting means pertaining to said channel and embodying a pattern of interference fringes relative to said shape, and radiation detection means optically coupled to said channel output ; said information support being illuminated by said emissive device ; sAid lens concentrating said optical radiation within said filtering plane ; said pattern of fringes lying within said filtering plane, for diffracting said concentrated optical radiation ; said radiation detection means being positioned for supplying said signal in response to a fraction of the diffracted radiation emerging from said diffracting means.
Claim 2
Dependent Claim
153 words
Double diffraction optical correlator including at least one correlation channel having an input and an output for delivering a signal indicative of the presence of at least one predetermined shape in an optical information support said correlator comprising : an emissive device supplying optical radiation to said channel input, a holographic converging lens associated with said channel, a filtering plane positioned across said channel, diffracting means pertaining to said channel and embodying a pattern of interference fringes relative to said shape, and radiation detection means optically coupled to said channel output ; said information support being illuminated by said emissive device ; sAid lens concentrating said optical radiation within said filtering plane ; said pattern of fringes lying within said filtering plane, for diffracting said concentrated optical radiation ; said radiation detection means being positioned for supplying said signal in response to a fraction of the diffracted radiation emerging from said diffracting means.
Claim 3
Dependent Claim
60 words
Double diffraction optical correlator as claimed in claim 1, wherein said pattern of interference fringes is a -Fourier transform-holographic filter ; said diffracting means comprising, associated with said filter, a converging holographic lens ; said filter and said lens being positioned in parallel planes and conjointly ensuring convergence of said fraction of the diffracted radiation onto said radiation detection means.
Claim 4
Dependent Claim
37 words
Double diffraction optical correlator as claimed in claim 1, wherein said pattern of interference fringes is a -Fourier transform-holographic filter ; said filter ensuring convergence of said fraction of the diffracted radiation onto said radiation detection means.
Claim 5
Dependent Claim
21 words
Double diffraction optical correlator as claimed in claim 1, wherein said emissive device comprises at least one quasi-monochromatic and quasi-punctual source.
Claim 6
Dependent Claim
32 words
Double diffraction optical correlator as claimed in claim 1, wherein said emissive device comprises at least one radiation source ; each said source being associated with at least one said correlation channel.
Claim 7
Dependent Claim
20 words
Double diffraction optical correlator as claimed in claim 4, wherein said quasi-monochromatic and quasi-punctual source is a photo-emissive semiconductor element.
Claim 8
Dependent Claim
55 words
Double diffraction optical correlator as claimed in claim 1, wherein said pattern of interference fringes is a Fourier transform holographic filter ; said filter being constructed for respectively insuring convergence of said fraction of the diffracted radiation onto said radiation detection means upon receiving from said information support said optical-radiation modulated by said predetermined shape.
References Cited (Backward Citations)
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US3540791A
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US3622988A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-01-14 | 1977-07-16 | 1978-01-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-01-14 | 1981-07-16 | 1982-01-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-01-14 | 1985-07-16 | 1986-01-15 | $7700.00 | Window Closed / Lapsed |