US4087690A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Spurious radiation compensation in infrared analyzers
Assignee: EIDP Inc
•
Filing: 1976-06-22
•
Granted: 1978-05-02
•
Expires: 1996-06-22
Abstract
Abstract Method and apparatus for compensating spurious radiation detector signal output variations during operation of an infrared (IR) analyzer.
Inventors
- 👤 James Merrill Prober
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 00:32
CPC Classifications
G; G01; G01N; G01N21/00; G01N21/17; G01N21/25; G01N21/31; G01N21/314; G06; G06G; G06G7/00; G06G7/12; G06G7/16; G06G7/161
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
107 words
The method of compensating infrared radiation photometric analyzers for extraneous infrared radiation contributed by apparatus elements, as distinguished from the analytical and reference radiation signals per se, comprising providing a movable filter support structure interposing individual filters sequentially across the infrared radiation beam with radiation non-transmitting dummy ports of the same size, type and composition as their transmitting counterparts blocked with an opaque material on the analyzer source side, and electrically cancelling the effects of said extraneous infrared radiation from the individual measured signals of the analytical and reference filters with outputs contributed by their dummy counterparts during each operating cycle of said movable filter support structure.
Claim 2
Independent Claim
107 words
The method of compensating infrared radiation photometric analyzers for extraneous infrared radiation contributed by apparatus elements, as distinguished from the analytical and reference radiation signals per se, comprising providing a movable filter support structure interposing individual filters sequentially across the infrared radiation beam with radiation non-transmitting dummy ports of the same size, type and composition as their transmitting counterparts blocked with an opaque material on the analyzer source side, and electrically cancelling the effects of said extraneous infrared radiation from the individual measured signals of the analytical and reference filters with outputs contributed by their dummy counterparts during each operating cycle of said movable filter support structure.
Claim 3
Dependent Claim
109 words
In an infrared radiation photometric analyzer compensated for extraneous infrared radiation contributed by apparatus elements, as distinguished from the analytical and reference radiation signals per se, the provision of a movable filter support structure interposing individual filters sequentially across the infrared radiation beam having radiation non-transmitting dummy ports of the same size, type and composition as their transmitting counterparts blocked with an opaque material on the analyzer source side, and means electrically cancelling the effects of said extraneous infrared radiation from the individual measured signals of the analytical and reference filters with the outputs contributed by their dummy counterparts during each operating cycle of said movable filter support structure.
Claim 4
Dependent Claim
109 words
In an infrared radiation photometric analyzer compensated for extraneous infrared radiation contributed by apparatus elements, as distinguished from the analytical and reference radiation signals per se, the provision of a movable filter support structure interposing individual filters sequentially across the infrared radiation beam having radiation non-transmitting dummy ports of the same size, type and composition as their transmitting counterparts blocked with an opaque material on the analyzer source side, and means electrically cancelling the effects of said extraneous infrared radiation from the individual measured signals of the analytical and reference filters with the outputs contributed by their dummy counterparts during each operating cycle of said movable filter support structure.
Claim 5
Independent Claim
111 words
The method of compensating rotary filter wheel type infrared radiation photometric analyzers for extraneous infrared radiation contributed by apparatus elements, as distinguished from the analytical and reference radiation signals per se, comprising, providing said rotary filter wheel with radiation non-transmitting dummy ports of the same size, type and composition as their transmitting counterparts disposed generally co-radially of said filter wheel, blocked with an opaque material on the analyzer source side, and electrically inverting and opposing individual measured signals of successive analytical and reference filters with the outputs contributed by their dummy counterparts during each full rotation of said rotary filter wheel to thereby cancel the effects of said extraneous infrared radiation.
Claim 6
Independent Claim
111 words
The method of compensating rotary filter wheel type infrared radiation photometric analyzers for extraneous infrared radiation contributed by apparatus elements, as distinguished from the analytical and reference radiation signals per se, comprising, providing said rotary filter wheel with radiation non-transmitting dummy ports of the same size, type and composition as their transmitting counterparts disposed generally co-radially of said filter wheel, blocked with an opaque material on the analyzer source side, and electrically inverting and opposing individual measured signals of successive analytical and reference filters with the outputs contributed by their dummy counterparts during each full rotation of said rotary filter wheel to thereby cancel the effects of said extraneous infrared radiation.
Claim 7
Dependent Claim
109 words
In a rotary filter wheel type infrared radiation photometric analyzer compensated for extraneous infrared radiation contributed by apparatus elements, as distinguished from the analytical and reference radiation signals per se, the provision in said rotary filter wheel of radiation non-transmitting dummy ports of the same size, type and composition as their transmitting counterparts disposed generally co-radially of said filter wheel, blocked with an opaque material on the analyzer source side, and means electrically inverting and opposing signals of successive analytical and reference filters with the outputs contributed by their dummy counterparts during each rotation of said rotary filter wheel to thereby cancel the effects of said extraneous infrared radiation.
Claim 8
Dependent Claim
109 words
In a rotary filter wheel type infrared radiation photometric analyzer compensated for extraneous infrared radiation contributed by apparatus elements, as distinguished from the analytical and reference radiation signals per se, the provision in said rotary filter wheel of radiation non-transmitting dummy ports of the same size, type and composition as their transmitting counterparts disposed generally co-radially of said filter wheel, blocked with an opaque material on the analyzer source side, and means electrically inverting and opposing signals of successive analytical and reference filters with the outputs contributed by their dummy counterparts during each rotation of said rotary filter wheel to thereby cancel the effects of said extraneous infrared radiation.
Claim 9
Dependent Claim
39 words
The method of compensating rotary filter type infrared radiation photometric analyzers for extraneous radiation contributed by apparatus elements according to claim 3 wherein preselected modulated reference or analytical radiation signals are also cancelled by electrical inversion and opposition techniques.
Claim 10
Dependent Claim
26 words
Apparatus according to claim 4 provided with means for cancelling a preselected one of the reference and analytical radiation components by electrical inversion and opposition techniques.
Claim 11
Independent Claim
109 words
The method of compensating rotary filter wheel type infrared radiation photometric analyzers for extraneous infrared radiation contributed by apparatus elements, as distinguished from the analytical and reference radiation signals per se, comprising providing said rotary filter wheel with radiation non-transmitting dummy ports of the same size, type and composition as their transmitting counterparts disposed 180° symmetrically opposite thereto, blocked with an opaque material on the analyzer source side, and electrically inverting and opposing individual measured signals of successive analytical and reference filters with the outputs contributed by their dummy counterparts during each full rotation of said rotary filter wheel to thereby cancel the effects of said extraneous infrared radiation.
Claim 12
Independent Claim
109 words
The method of compensating rotary filter wheel type infrared radiation photometric analyzers for extraneous infrared radiation contributed by apparatus elements, as distinguished from the analytical and reference radiation signals per se, comprising providing said rotary filter wheel with radiation non-transmitting dummy ports of the same size, type and composition as their transmitting counterparts disposed 180° symmetrically opposite thereto, blocked with an opaque material on the analyzer source side, and electrically inverting and opposing individual measured signals of successive analytical and reference filters with the outputs contributed by their dummy counterparts during each full rotation of said rotary filter wheel to thereby cancel the effects of said extraneous infrared radiation.
Claim 13
Dependent Claim
107 words
In a rotary filter wheel type infrared radiation photometric analyzer compensated for extraneous infrared radiation contributed by apparatus elements, as distinguished from the analytical and reference radiation signals per se, the provision in said rotary filter wheel of radiation non-transmitting dummy ports of the same size, type and composition as their transmitting counterparts disposed 180° symmetrically opposite thereto, blocked with an opaque material on the analyzer source side, and means electrically inverting and opposing signals of successive analytical and reference filters with the outputs contributed by their dummy counterparts during each rotation of said rotary filter wheel to thereby cancel the effects of said extraneous infrared radiation.
Claim 14
Dependent Claim
107 words
In a rotary filter wheel type infrared radiation photometric analyzer compensated for extraneous infrared radiation contributed by apparatus elements, as distinguished from the analytical and reference radiation signals per se, the provision in said rotary filter wheel of radiation non-transmitting dummy ports of the same size, type and composition as their transmitting counterparts disposed 180° symmetrically opposite thereto, blocked with an opaque material on the analyzer source side, and means electrically inverting and opposing signals of successive analytical and reference filters with the outputs contributed by their dummy counterparts during each rotation of said rotary filter wheel to thereby cancel the effects of said extraneous infrared radiation.
Claim 15
Dependent Claim
40 words
The method of compensating rotary filter type infrared radiation photometric analyzers for extraneous infrared radiation contributed by apparatus elements according to claim 7 wherein preselected modulated reference or analytical radiation signals are also cancelled by electrical inversion and opposition techniques.
Claim 16
Dependent Claim
26 words
Apparatus according to claim 8 provided with means for cancelling a preselected one of the reference and analytical radiation components by electrical inversion and opposition techniques.
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) | 1981-05-01 | 1981-10-31 | 1982-05-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-05-01 | 1985-10-31 | 1986-05-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-05-01 | 1989-10-31 | 1990-05-02 | $7700.00 | Window Closed / Lapsed |