Patent US4383762A successfully refreshed from Google Patents.
US4383762A
Expired / Lapsed
US
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Two-beam interferometer for Fourier spectroscopy with rigid pendulum
Assignee: ERWIN KAYSER - THREDE GmbH
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Filing: 1981-02-10
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Granted: 1983-05-17
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Expires: 2001-02-10
Abstract
Abstract A two-beam interferometer for Fourier spectroscopy includes a rigid pendulum structure mounting at least one of the movable retroreflectors in a fully compensated optical system immune to tilt and lateral movement distortions. The swing of the rotatably journaled pendulum accurately confines the retroreflector(s) to movement in a single plane during scanning and, due to the low heat generated in the pendulum bearings, the simple and compact structure is well adapted to be housed in a cryostat aboard a spacecraft.
Inventors
- 👤 Peter Burkert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 20:27
CPC Classifications
G; G01; G01J; G01J3/00; G01J3/28; G01J3/45; G01J3/453; G01J3/4532
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
94 words
A two-beam interferometer for Fourier spectroscopy, particularly for measuring radiation in cryostats aboard spacecraft, including a beam splitter arranged in the path of a source beam, a first reflector, a second movable retroreflector, and a detector system for recording the measured radiation, characterized by: (a) rigid pendulum means rotatably mounted to swing in a single plane, and (b) means mounting the movable retroreflector to the pendulum means spaced from the center of rotation of the pendulum means as part of a fully compensated optical system which is immune to tilting and transverse movement distortions.
Claim 2
Dependent Claim
94 words
A two-beam interferometer for Fourier spectroscopy, particularly for measuring radiation in cryostats aboard spacecraft, including a beam splitter arranged in the path of a source beam, a first reflector, a second movable retroreflector, and a detector system for recording the measured radiation, characterized by: (a) rigid pendulum means rotatably mounted to swing in a single plane, and (b) means mounting the movable retroreflector to the pendulum means spaced from the center of rotation of the pendulum means as part of a fully compensated optical system which is immune to tilting and transverse movement distortions.
Claim 3
Dependent Claim
24 words
An interferometer according to claim 1, wherein the first reflector is a movable retroreflector, and wherein both retroreflectors are mounted to the pendulum means.
Claim 4
Dependent Claim
23 words
An interferometer according to claim 2, wherein both retroreflectors are individually mounted to separate and perpendicular arms of a rigid two-arm pendulum system.
Claim 5
Dependent Claim
28 words
An interferometer according to claim 3, wherein both retroreflectors are mounted on the pendulum arms at the same distance from the center of rotation of the pendulum means.
Claim 6
Dependent Claim
24 words
An interferometer according to claim 4, wherein the retroreflectors are triple reflectors, cubic cornered full prisms, or cat's eyes designed as reflectors or lenses.
Claim 7
Dependent Claim
34 words
An interferometer according to claim 2, wherein both retroreflectors are mounted to a single rigid pendulum arm, and a deflecting mirror (21') is provided to direct a radiation beam to the second retroreflector (12').
Claim 8
Dependent Claim
69 words
An interferometer according to claim 2, wherein both retroreflectors (3", 12") are individually mounted to separate arms of a rigid pendulum structure such that the retroreflectors are arranged facing the center plane which bisects the angle between the separate arms, but at different distances from the center of rotation of the pendulum means, and wherein a deflecting mirror (21") is provided to direct radiation to the second retroreflector (12").
Claim 9
Dependent Claim
45 words
An interferometer according to any one of claims 1 to 7, wherein the pendulum means has an auxiliary arm with a balance weight mounted thereon such that the center of gravity of the pendulum means coincides with the center of rotation of the pendulum means.
Claim 10
Dependent Claim
30 words
An interferometer according to claim 8, wherein the pendulum means axis of rotation is vertically oriented, is fastened to a support by a thread, and is journaled in ball bearings.
References Cited (Backward Citations)
GB1010277A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-05-16 | 1986-11-15 | 1987-05-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-05-16 | 1990-11-15 | 1991-05-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-05-16 | 1994-11-15 | 1995-05-17 | $7700.00 | Window Closed / Lapsed |