US3877812A
Expired / Lapsed
US
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Multiple wavelength spectrometer
Assignee: Schneider Electric Systems USA Inc
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Filing: 1973-01-31
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Granted: 1975-04-15
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Expires: 1993-01-31
Abstract
Abstract There is disclosed a multiple wavelength infrared spectrometer. It includes an optical chopper and a pendulum-like filter carrier which inserts a plurality of filters sequentially into the radiation beam. Filter changes occur during an opaque period of the chopper and each filter remains in place for a predetermined number of radiation pulses. The radiation passes through the sample and onto a detector which produces an electrical signal. An electronic circuit operates upon the signal so produced to provide an output proportional to sample absorbance.
Inventors
- 👤 Duane T Thompson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 09:50
CPC Classifications
G; G01; G01J; G01J3/00; G01J3/02; G01J3/0205; G01J3/0232; G01N; G01N21/00; G01N21/17; G01N21/25; G01N21/31; G01N21/314; G01J3/12; G01J2003/1213
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
100 words
A multiple wavelength radiation analyzer which comprises: means for detecting electromagnetic radiation from a radiation source; a chopper intermediate said source and detecting means positioned to chop said radiation at a first frequency; means for supporting a plurality of filters is close spatial relationship to said chopper; and means driven by said chopper for positioning said supporting means to periodically, repetitively, and alternatively insert each of said filters into the path of said radiation between said source and detecting means for a preselected observation period greater than the chopping period and keeping each filter stationary during its respective observation period.
Claim 2
Dependent Claim
100 words
A multiple wavelength radiation analyzer which comprises: means for detecting electromagnetic radiation from a radiation source; a chopper intermediate said source and detecting means positioned to chop said radiation at a first frequency; means for supporting a plurality of filters is close spatial relationship to said chopper; and means driven by said chopper for positioning said supporting means to periodically, repetitively, and alternatively insert each of said filters into the path of said radiation between said source and detecting means for a preselected observation period greater than the chopping period and keeping each filter stationary during its respective observation period.
Claim 3
Dependent Claim
17 words
The analyzer of claim 1 wherein said supporting means comprises an oscillatory member having said filters thereon.
Claim 4
Dependent Claim
21 words
The analyzer of claim 1 wherein said chopper comprises a rotatable wheel having a plurality of opaque blades about its periphery.
Claim 5
Dependent Claim
42 words
The analyzer of claim 3 wherein said supporting means comprises an oscillatory member having said filters thereon; and said positioning means comprises camming means driven by said wheel for positioning said oscillatory member in response to the rotational position of said wheel.
Claim 6
Dependent Claim
24 words
The analyzer of claim 4 wherein said wheel includes a substantially cup-shaped central portion having said blades extending radially outward from its rim portion.
Claim 7
Dependent Claim
24 words
The analyzer of claim 5 wherein said oscillatory member is a relatively thin flag supporting said filters in close spatial relationship to said blades.
Claim 8
Dependent Claim
19 words
The analyzer of claim 6 wherein said camming means are substantially enclosed within the cup-shaped portion of said wheel.
Claim 9
Dependent Claim
113 words
A multiple wavelength spectrometer which comprises: a source of electromagnetic radiation; means for directing said radiation to a sample to be analyzed; means for detecting radiation leaving said sample; a chopper intermediate said source and detecting means positioned to chop said radiation at a first frequency; means for supporting a plurality of filters in close spatial relationship to said chopper; and means driven by said chopper for positioning said supporting means to periodically, repetitively, and alternatively insert each of said filters into the path of said radiation between said source and detecting means for a preselected observation period greater than the chopping period and keeping each filter stationary driving its respective observation period.
Claim 10
Dependent Claim
113 words
A multiple wavelength spectrometer which comprises: a source of electromagnetic radiation; means for directing said radiation to a sample to be analyzed; means for detecting radiation leaving said sample; a chopper intermediate said source and detecting means positioned to chop said radiation at a first frequency; means for supporting a plurality of filters in close spatial relationship to said chopper; and means driven by said chopper for positioning said supporting means to periodically, repetitively, and alternatively insert each of said filters into the path of said radiation between said source and detecting means for a preselected observation period greater than the chopping period and keeping each filter stationary driving its respective observation period.
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) | 1978-04-14 | 1978-10-14 | 1979-04-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-04-14 | 1982-10-14 | 1983-04-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-04-14 | 1986-10-14 | 1987-04-15 | $7700.00 | Window Closed / Lapsed |