US3687519A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Semi-micro absolute transmittance and specular reflectance accessory for spectrophotometers
Assignee: United States Department of the Army
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Filing: 1971-02-24
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Granted: 1972-08-29
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Expires: 1991-02-24
Abstract
Abstract This invention relates to an improved accessory for spectrophotometers having a plurality of reflecting means some of which are fixed and others exactly repositionable; all of such reflecting means are mounted upon a platform which can be kinematically positioned intermediate to a monochromatic light source and measuring means so that the monochromatic beam is reflected toward a semi-micro sample, which may be held in a cryostat, permitting the determination of absolute transmittance and reflectance over a wide range of temperatures.
Inventors
- 👤 James E Mapes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 11:43
CPC Classifications
G; G01; G01J; G01J3/00; G01J3/28; G01J3/42
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
296 words
An improved optical system for a spectrophotometer of the type wherein absolute transmittance and reflectance values of light are measured, having a monochromator emit a monochromatic exit beam of light, a dewar having first and second oppositely disposed windows, means for holding a solid sample having two oppositely disposed smooth faces in said dewar with one of said faces in a vertical plane, which contains said exit beam, equidistant between said windows and movable thereat, a means for measuring the amount of light from said sample wherein the improvement comprises: means for mounting a plurality of reflectors; a first reflecting means, rotatably mounted on said means for mounting in line with said exit beam intercepting and deflecting said monochromatic beam which includes; a first, curved first surface mirror horizontally rotatably mounted on said mounting means; a first position stop for said first mirror intercepting and deflecting said monochromatic beam; and a second position stop for said first mirror intercepting and deflecting said monochromatic beam; a second reflecting means kinematically mounted to said mounting means in one of two positions, said positions being mirror images with respect to said vertical plane, for intercepting said beam from said first reflecting means and deflecting said beam through said first dewar windows toward said sample for reflectane measurements, or through said second dewar window for transmittance measurements at a near normal angle of incidence; a third reflecting means optically aligned and fixed to said mounting means for intercepting and deflecting reflected and transmitted beams from said sample; and a fourth reflecting means optically aligned and mechanically fixed to said mounting means for intercepting and deflecting said deflected beam from said third reflecting means to a normal exit path, which is in line with said monochromatic beam, to said measuring means.
Claim 2
Dependent Claim
296 words
An improved optical system for a spectrophotometer of the type wherein absolute transmittance and reflectance values of light are measured, having a monochromator emit a monochromatic exit beam of light, a dewar having first and second oppositely disposed windows, means for holding a solid sample having two oppositely disposed smooth faces in said dewar with one of said faces in a vertical plane, which contains said exit beam, equidistant between said windows and movable thereat, a means for measuring the amount of light from said sample wherein the improvement comprises: means for mounting a plurality of reflectors; a first reflecting means, rotatably mounted on said means for mounting in line with said exit beam intercepting and deflecting said monochromatic beam which includes; a first, curved first surface mirror horizontally rotatably mounted on said mounting means; a first position stop for said first mirror intercepting and deflecting said monochromatic beam; and a second position stop for said first mirror intercepting and deflecting said monochromatic beam; a second reflecting means kinematically mounted to said mounting means in one of two positions, said positions being mirror images with respect to said vertical plane, for intercepting said beam from said first reflecting means and deflecting said beam through said first dewar windows toward said sample for reflectane measurements, or through said second dewar window for transmittance measurements at a near normal angle of incidence; a third reflecting means optically aligned and fixed to said mounting means for intercepting and deflecting reflected and transmitted beams from said sample; and a fourth reflecting means optically aligned and mechanically fixed to said mounting means for intercepting and deflecting said deflected beam from said third reflecting means to a normal exit path, which is in line with said monochromatic beam, to said measuring means.
Claim 3
Dependent Claim
110 words
The improved optical system as recited in claim 1 wherein said second reflecting means comprises: a second curved first surface mirror kinematically mounted to said mounting means, thereby permitting said second mirror to be positioned and repetitively relocated at a first of said two positions for intercepting and deflecting said monochromatic beam when said first mirror is in said first position stop, and to position and repetitively relocate said second mirror at a second of said two positions for intercepting and deflecting said monochromatic beam when said first mirror is in said second position stop, so that said second mirror can be used for making both reflectance and transmittance measurements.
Claim 4
Dependent Claim
39 words
The improved optical system as recited in claim 1 wherein said third reflecting means comprises: a third curved first surface mirror fixed to said mounting means to optically intercept and deflect light reflected from or transmitted through said sample.
Claim 5
Dependent Claim
21 words
The improved optical system as recited in claim 1 wherein said fourth reflecting means is a fourth curved first surface mirror.
Claim 6
Dependent Claim
26 words
The improved optical system as recited in claim 1 wherein said mounting means comprises: a horizontal platform kinematically located between said monochromator and said measuring means.
References Cited (Backward Citations)
US3402634A
Cited
US3499716A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-08-29 | 1976-02-28 | 1976-08-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-08-29 | 1980-02-28 | 1980-08-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-08-29 | 1984-02-28 | 1984-08-29 | $7700.00 | Window Closed / Lapsed |