Patent EP0311148A2 successfully refreshed from Google Patents.
EP0311148A2
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Apparatus for monitoring infra-red emissions
Assignee: United Kingdom Atomic Energy Authority
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Filing: 1986-02-05
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Granted: —
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Expires: 2006-02-05
Abstract
Abstract The apparatus has an infra-red sensor (88) which by means of a rotary scanning head (74) is provided in continuously repeated cycles with an overall field of view encompassing an area under surveillance. Included in an optical system (90 to 94) associated with the scanning head is an anamorphic lens (90) by which to enlarge, with a ratio of its wide and narrow angles of view of up to as much as 220:1, the field of view in a direction perpendicular to the plane of rotation of the scanning head.
Inventors
- 👤 Stanley Alfred Edwards
- 👤 Robert Hunt
- 👤 Daniel Richard Lobb
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-10 02:21
CPC Classifications
G; G08; G08B; G08B13/00; G08B13/18; G08B13/181; B; B23; B23K; B23K26/00; B23K26/70; B23K26/702; B23K26/706; F; F16; F16P; F16P1/00; F16P1/06; F16P3/00; F16P3/12; F16P3/14; F16P3/144; G01; G01J; G01J5/00; G01J5/02; G01J5/04; G01J5/047; G01J5/08; G01J5/0806; G01J5/0808; G01J5/0813; G01J1/00; G01J1/02; G01J2001/0276; G01J2001/0285
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
149 words
Apparatus for monitoring infra-red emissions comprising sensor means responsive to infra-red radiation for producing an electrical output related to the intensity of infra-red radiation incident thereon, scanning means for effecting a cyclical scan to provide the sensor means, in use of the apparatus, repeatedly with an overall field of view encompassing an area under surveillance, said scanning means including an anamorphic lens for providing said sensor means with a refracted instantaneous field of view which is scanned in a direction generally orthogonal to its wide angle of view to provide the sensor means with said overall field of view, means for analysing the outputs of the sensor means with reference to a predetermined threshold value or values to detect within said overall field of view arising sources of infra-red radiation representing potentially hazardous conditions, and means for generating an actuating signal in the event of detection of such sources.
Claim 2
Dependent Claim
149 words
Apparatus for monitoring infra-red emissions comprising sensor means responsive to infra-red radiation for producing an electrical output related to the intensity of infra-red radiation incident thereon, scanning means for effecting a cyclical scan to provide the sensor means, in use of the apparatus, repeatedly with an overall field of view encompassing an area under surveillance, said scanning means including an anamorphic lens for providing said sensor means with a refracted instantaneous field of view which is scanned in a direction generally orthogonal to its wide angle of view to provide the sensor means with said overall field of view, means for analysing the outputs of the sensor means with reference to a predetermined threshold value or values to detect within said overall field of view arising sources of infra-red radiation representing potentially hazardous conditions, and means for generating an actuating signal in the event of detection of such sources.
Claim 3
Dependent Claim
65 words
Apparatus as claimed in Claim 1 including means for testing said sensor means, said testing means being operable to suppress said actuating signal only in response to detection of a source(s) by said analysing means within a predetermined zone or zones of the scanned field of view whereby said actuating signal is generated only in response to potentially hazardous sources lying outside said predetermined zone(s).
Claim 4
Dependent Claim
22 words
Apparatus as claimed in Claim 1 or 2 in which the scanning means is operable selectively to effect scanning at different speeds.
Claim 5
Dependent Claim
53 words
Apparatus as claimed in any one of Claims 1-3 in which said analysing means is arranged to derive from the sensor means a series of output signals corresponding to successive instantaneous fields of view and is operable to analyse said output signals both individually and groupwise to provide different degrees of temperature resolution.
Claim 6
Dependent Claim
112 words
Apparatus as claimed in any one of Claims 1-4 in which said analysing means includes means for repeatedly sampling the output of the sensor means in the course of each scanning cycle to produce a predetermined number of sampled signals each corresponding to successive instantaneous fields of view, store means storing a number of reference signals each corresponding to a respective one of said successive instantaneous fields of view and collectively forming a reference radiation profile for the overall field of view, and means for comparing each sampled signal with the associated stored reference signal to determine whether or not the difference therebetween exceeds the threshold value or a respective threshold value.
Claim 7
Dependent Claim
26 words
Apparatus as claimed in Claim 5 in which the stored reference profile is periodically updated using the profile obtained in the course of a scanning cycle.
Claim 8
Dependent Claim
41 words
Apparatus as claimed in Claim 6 in which said updating is effected after each set of N scanning cycles, where N is an integer greater than or equal to 1, by substituting the stored reference signals by respective sampled output signals.
Claim 9
Dependent Claim
36 words
Apparatus as claimed in any one of Claims 1-7 in which the ratio of the wide and narrow angles of the instantaneous field of view subtended by said anamorphic lens is at least 50 : 1.
Claim 10
Dependent Claim
22 words
Apparatus as claimed in Claim 8 in which said ratio is in the range from 120 : 1 to 220 : 1.
Claim 11
Dependent Claim
32 words
Apparatus as claimed in Claim 8 or 9 in which the wide angle of the instantaneous field of view subtended by said anamorphic lens is in the range of 90° to 220°.
References Cited (Backward Citations)
No citation records indexed.
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