US3753619A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Interference spectroscopy
Assignee: BECKMAN R I I C LTD GB
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Filing: 1971-10-26
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Granted: 1973-08-21
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Expires: 1991-10-26
Abstract
Abstract Spectroscopic apparatus for obtaining spectral information about a sample including means for producing two parallel beams of radiation adapted to selectively pass through the sample. Spectroscopic apparatus comprising means for producing two parallel beams of radiation adapted to selectively pass through a sample; means upon which each of the beams is incident for dividing said beams into partially reflected and partially transmitted components; means for superimposing the reflected and transmitted components of each beam upon each other to recombine the respective beams, said superimposing means including at least one reflecting means for reflecting one of the components of each beam which is movable in a direction parallel to the direction of incidence of the beam components; means for modulating the intensity of each beam at a different frequency; detector means adapted to receive radiation from each of said modulated beams; and means for measuring the amplitudes of the components of the detector output produced by each of the respective beams.
Inventors
- 👤 L Thorpe
- 👤 G Hayward
- 👤 J Waters
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:26
CPC Classifications
G; G01; G01J; G01J3/00; G01J3/28; G01J3/45; G01J3/453
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
93 words
A method for obtaining spectral information about a sample including the steps of: providing from a single source two parallel beams of radiation; dividing each beam into partially reflected and partially transmitted components; recombining the respective beams by superimposing the reflected and transmitted components of each beam upon each other; modulating the intensity of the beams at different frequencies; monitoring the intensity of each of the recombined beams with a radiation responsive detector; and measuring the amplitude of the components of the detector output with a sample positioned in one of the beams.
Claim 2
Independent Claim
93 words
A method for obtaining spectral information about a sample including the steps of: providing from a single source two parallel beams of radiation; dividing each beam into partially reflected and partially transmitted components; recombining the respective beams by superimposing the reflected and transmitted components of each beam upon each other; modulating the intensity of the beams at different frequencies; monitoring the intensity of each of the recombined beams with a radiation responsive detector; and measuring the amplitude of the components of the detector output with a sample positioned in one of the beams.
Claim 3
Dependent Claim
145 words
Spectroscopic apparatus comprising means for producing two parallel beams of radiation from a single source; means upon which each of the beams is incident for dividing said beams into partially reflected and partially transmitted components; means for superimposing the reflected and transmitted components of each beam upon each other to recombine the respective beams, said superimposing means including at least one reflecting means for reflecting one of the components of each beam which is movable in a direction parallel to the direction of incidence of the beam components; means for modulating the intensity of each beam at a different frequency; means for positioning a sample in the path of one of said beams; detector means adapted to receive radiation from each of said modulated beams; and means for measuring the amplitudes of the components of the detector output produced by each of the respective beams.
Claim 4
Dependent Claim
145 words
Spectroscopic apparatus comprising means for producing two parallel beams of radiation from a single source; means upon which each of the beams is incident for dividing said beams into partially reflected and partially transmitted components; means for superimposing the reflected and transmitted components of each beam upon each other to recombine the respective beams, said superimposing means including at least one reflecting means for reflecting one of the components of each beam which is movable in a direction parallel to the direction of incidence of the beam components; means for modulating the intensity of each beam at a different frequency; means for positioning a sample in the path of one of said beams; detector means adapted to receive radiation from each of said modulated beams; and means for measuring the amplitudes of the components of the detector output produced by each of the respective beams.
Claim 5
Dependent Claim
25 words
Spectroscopic apparatus as defined in claim 2 wherein said sample is positioned in the path of one of said beams after modulation of said beams.
Claim 6
Dependent Claim
30 words
Spectroscopic apparatus as defined in claim 2 wherein said superimposing means comprise at least part of a Michelson-type interferometer, with said reflecting means comprising a scanning mirror of said interferometer.
Claim 7
Dependent Claim
40 words
Spectroscopic apparatus as defined in claim 2 wherein said modulation means comprise a separate rotatable member for each beam, with said rotatable members being positioned to introduce into and withdraw from each beam an opaque object at a predetermined frequency.
Claim 8
Dependent Claim
22 words
Spectroscopic apparatus as defined in claim 5 wherein said rotatable members each comprise a rotatable fan driven by a constant speed motor.
Claim 9
Dependent Claim
50 words
Spectroscopic apparatus as defined in claim 2 wherein said means for measuring the amplitude of the components of the detector output includes a phase-sensitive detector tuned to the frequencies at which said beams are modulated, and a filter circuit adapted to receive each of the respective signals after phase-sensitive detection.
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) | 1976-08-20 | 1977-02-19 | 1977-08-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-20 | 1981-02-19 | 1981-08-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-20 | 1985-02-19 | 1985-08-21 | $7700.00 | Window Closed / Lapsed |