Patent US4256405A successfully refreshed from Google Patents.
US4256405A
Expired / Lapsed
US
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Scanning spectrometer
Assignee: Department of National Defence
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Filing: 1978-09-20
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Granted: 1981-03-17
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Expires: 1998-09-20
Abstract
Abstract The dispersion means of the present scanning spectrometer comprises an interference filter or diffraction means to be positioned at a known angle to the optical axis of the input flux to the spectrometer. The spectrometer is provided with shutter means for passing the light to the filter or diffraction means through sequentially spatially varied locations in the shutter means, and with means for receiving and passing light from sequentially varied locations of the shutter means at varying, measurable angles of incidence to the filter or diffraction means. The shutter means may be a liquid crystal cell.
Inventors
- 👤 Earl J. Fjarlie
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 14:25
CPC Classifications
G; G01; G01J; G01J3/00; G01J3/12; G01J3/02; G01J3/0205; G01J3/0229; G01J3/0232; G01J3/28; G01J3/2846; G02; G02F; G02F1/00; G02F1/01; G02F1/13; G02F1/1313; G01J2003/1226; G01J2003/1243; G01J2003/1247
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
143 words
In a spectrometer for analyzing a spectrum of light from a source, the spectrometer having a slit assembly for isolating a certain input flux along an optical axis, dispersion means for dispersing that flux into its constituent wave length parts, shutter means for passing the light to the dispersion means through sequentially spatially varied locations in the shutter means, and a recording detector for identifying and recording spectral features of the light, the improvement wherein the spectrometer is provided with an electronic scanner shutter means consisting of a liquid crystal cell, and with cylindrical lens means for receiving and passing light from such sequentially spatially varied locations of the shutter means to the dispersion means at varying measurable angles of incidence and wherein the dispersion means comprises an interference filter positioned at a known angle to the optical axis of the input flux.
Claim 2
Dependent Claim
143 words
In a spectrometer for analyzing a spectrum of light from a source, the spectrometer having a slit assembly for isolating a certain input flux along an optical axis, dispersion means for dispersing that flux into its constituent wave length parts, shutter means for passing the light to the dispersion means through sequentially spatially varied locations in the shutter means, and a recording detector for identifying and recording spectral features of the light, the improvement wherein the spectrometer is provided with an electronic scanner shutter means consisting of a liquid crystal cell, and with cylindrical lens means for receiving and passing light from such sequentially spatially varied locations of the shutter means to the dispersion means at varying measurable angles of incidence and wherein the dispersion means comprises an interference filter positioned at a known angle to the optical axis of the input flux.
Claim 3
Dependent Claim
47 words
A spectrometer according to claim 1, wherein the shutter means comprises a liquid crystal cell having a series of transparent electrodes deposited on its surfaces in contact with the liquid crystal, whereby sequential, spatial varying of the light passed to the filter is achieved by electronic means.
Claim 4
Dependent Claim
48 words
A spectrometer according to claim 1, wherein the shutter means is incorporated into the slit assembly and wherein the slit assembly and shutter means comprise a liquid crystal cell having a series of transparent electrodes deposited on the surfaces of the cell in contact with the liquid crystal.
Claim 5
Independent Claim
89 words
A method of analyzing the wave length of light from a source, comprising the steps of (a) sequentially spatially varying the light from said source along an optical axis by electronically scanning the incident light on a liquid crystal cell shutter means; (b) passing said sequentially spatially varied light through cylindrical lens means to a dispersion means in the form of an interference filter positioned at a known angle to said optical axis, at varying measurable angles of incidence, and (c) analyzing the resultant spectrum from said dispersion means.
Claim 6
Independent Claim
89 words
A method of analyzing the wave length of light from a source, comprising the steps of (a) sequentially spatially varying the light from said source along an optical axis by electronically scanning the incident light on a liquid crystal cell shutter means; (b) passing said sequentially spatially varied light through cylindrical lens means to a dispersion means in the form of an interference filter positioned at a known angle to said optical axis, at varying measurable angles of incidence, and (c) analyzing the resultant spectrum from said dispersion means.
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) | 1984-03-16 | 1984-09-15 | 1985-03-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-03-16 | 1988-09-15 | 1989-03-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-03-16 | 1992-09-15 | 1993-03-17 | $7700.00 | Window Closed / Lapsed |