US4677294A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Self-calibrating radiation sensors and control for radiation sensors
Assignee: Spectronix Ltd
•
Filing: 1980-09-04
•
Granted: 1987-06-30
•
Expires: 2000-09-04
Abstract
Abstract Self-calibrating radiation detection apparatus comprising a detector element and calibration apparatus for maintaining a generally constant response of the detector element to a predetermined radiation input notwithstanding changes in the level of background radiation sensed by the detector element. There is also provided control apparatus for operating a plurality of radiation detectors including apparatus for disabling the output of the detectors in response to a continuing radiation input of predetermined duration.
Inventors
- 👤 Yechiel Spector
- 👤 Amiram Peleg
- 👤 Ilan Cohen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 19:42
CPC Classifications
G; G08; G08B; G08B17/00; G08B17/12; G08B29/00; G08B29/02; G08B29/04; G08B29/043
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
171 words
For use in fire and explosion suppression apparatus, a self calibrating radiation detection apparatus comprising: (a) a combination of detector elements comprising: a first detector element for detection of radiation within a first range of wave-lengths; a second detector element for detection of radiation within a second range of wave-lengths different from said first range; and means for combining the outputs of said first and second detector elements; and (b) calibration apparatus for maintaining a generally constant response of said first detector element to a predetermined radiation input notwithstanding changes in the level of background radiation sensed by said first detector element and comprising: a calibrator for said first detector element comprising a timer which provides an output for a calibrating filament disposed in rigid spaced relationship with said first detector element, the timer receiving an input which is effective to terminate calibration upon detection of radiation by said second detector element and which is effective also to initiate calibration upon termination of receipt of radiation by said second detector element.
Claim 2
Dependent Claim
171 words
For use in fire and explosion suppression apparatus, a self calibrating radiation detection apparatus comprising: (a) a combination of detector elements comprising: a first detector element for detection of radiation within a first range of wave-lengths; a second detector element for detection of radiation within a second range of wave-lengths different from said first range; and means for combining the outputs of said first and second detector elements; and (b) calibration apparatus for maintaining a generally constant response of said first detector element to a predetermined radiation input notwithstanding changes in the level of background radiation sensed by said first detector element and comprising: a calibrator for said first detector element comprising a timer which provides an output for a calibrating filament disposed in rigid spaced relationship with said first detector element, the timer receiving an input which is effective to terminate calibration upon detection of radiation by said second detector element and which is effective also to initiate calibration upon termination of receipt of radiation by said second detector element.
Claim 3
Dependent Claim
17 words
Apparatus according to claim 1 and wherein said calibrating filament when energized represents a predetermined standard fire.
Claim 4
Dependent Claim
18 words
Apparatus according to claim 1 and wherein said detection apparatus is incorporated into fire and explosion detection apparatus.
Claim 5
Dependent Claim
15 words
Apparatus according to claim 1 and wherein said first detector element comprises an IR detector.
Claim 6
Dependent Claim
15 words
Apparatus according to claim 1 and wherein said second detector element comprises a UV detector.
Claim 7
Dependent Claim
15 words
Apparatus according to claim 4 and wherein said second detector element comprises a UV detector.
Claim 8
Dependent Claim
34 words
Apparatus according to claim 1 and wherein said rigid spaced relationship of said first detector element and said calibrating filament is achieved by disposing them in a rigid medium which permits radiation communication therebetween.
Claim 9
Dependent Claim
13 words
Apparatus according to claim 7 and wherein said medium is an epoxy resin.
Claim 10
Dependent Claim
102 words
Control apparatus for operating a plurality of detector elements which comprise: a first detector element for detection of radiation within a first range of wave-lengths; a second detector element for detection of radiation within a second range of wave-lengths different from said first range; and means for producing a combined output of said first and second detector elements; and said control apparatus comprising: means for periodically calibrating one of said first and second detector elements; and means for disabling said combined output in response to a continuing radiation input of predetermined duration at the other of said first and second detector elements.
Claim 11
Dependent Claim
102 words
Control apparatus for operating a plurality of detector elements which comprise: a first detector element for detection of radiation within a first range of wave-lengths; a second detector element for detection of radiation within a second range of wave-lengths different from said first range; and means for producing a combined output of said first and second detector elements; and said control apparatus comprising: means for periodically calibrating one of said first and second detector elements; and means for disabling said combined output in response to a continuing radiation input of predetermined duration at the other of said first and second detector elements.
Claim 12
Dependent Claim
46 words
Apparatus according to claim 9 and wherein said first detector element is an IR detector which is periodically calibrated, said second detector element is a UV detector and said means for disabling is responsive to a UV radiation input at said UV detector of predetermined duration.
Claim 13
Dependent Claim
150 words
For use in fire and explosion suppression apparatus, a self calibrating radiation detection apparatus comprising: (a) a combination of detector elements comprising: an infrared detector element; an ultraviolet detector element; and means for combining the outputs of said infrared detector element and said ultraviolet detector element; and (b) calibration apparatus for maintaining a generally constant response of said infrared detector element to a predetermined radiation input notwithstanding changes in the level of background radiation sensed by said infrared detector element and comprising: a calibrator for said infrared detector element comprising a timer which provides an output for an infrared emitter element disposed in rigid spaced relationship with said infrared detector element, the timer receiving an input which is effective to terminate calibration upon detection of radiation by said ultraviolet detector element and which is effective also to initiate calibration upon termination of receipt of radiation by said ultraviolet detector element.
Claim 14
Dependent Claim
150 words
For use in fire and explosion suppression apparatus, a self calibrating radiation detection apparatus comprising: (a) a combination of detector elements comprising: an infrared detector element; an ultraviolet detector element; and means for combining the outputs of said infrared detector element and said ultraviolet detector element; and (b) calibration apparatus for maintaining a generally constant response of said infrared detector element to a predetermined radiation input notwithstanding changes in the level of background radiation sensed by said infrared detector element and comprising: a calibrator for said infrared detector element comprising a timer which provides an output for an infrared emitter element disposed in rigid spaced relationship with said infrared detector element, the timer receiving an input which is effective to terminate calibration upon detection of radiation by said ultraviolet detector element and which is effective also to initiate calibration upon termination of receipt of radiation by said ultraviolet detector element.
Claim 15
Dependent Claim
18 words
Apparatus according to claim 11 and wherein said detection apparatus is incorporated into fire and explosion detection apparatus.
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) | 1990-06-29 | 1990-12-29 | 1991-06-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-06-29 | 1994-12-29 | 1995-06-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-06-29 | 1998-12-29 | 1999-06-30 | $7700.00 | Window Closed / Lapsed |