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1. 发明公开

EP0861426A1 INFRARED OPTICAL SYSTEM 失效
标题翻译：光学红外系统
公开(公告)号：EP0861426A1
公开(公告)日：1998-09-02
申请号：EP96938333.0
申请日：1996-11-11
申请人： THE SECRETARY OF STATE FOR DEFENCE
发明人： ASHLEY, Timothy , ELLIOTT, Charles, Thomas , GORDON, Neil, Thomson , HALL, Ralph, Stephen
IPC分类号： G01J1 , G01J5 , H01L31 , H01L33
CPC分类号： G01J5/06
摘要： An infrared optical system (100) incorporates a lens (118) imaging a remote scene onto a detector (112) within a cold shield (114). Stray radiation incident on the detector (112) is reduced by an optical stop in the form of a light emitting diode (LED) (126) producing negative luminescence. The LED (126) emits less radiation than background, and contributes less to the detector photon noise than an optical stop not exhibiting negative luminescence.

2. 发明授权

EP0861426B1 INFRARED OPTICAL SYSTEM 失效
标题翻译：光学红外系统
公开(公告)号：EP0861426B1
公开(公告)日：2001-08-29
申请号：EP96938333.0
申请日：1996-11-11
申请人： The Secretary of State for Defence
发明人： ASHLEY, Timothy , ELLIOTT, Charles, Thomas , GORDON, Neil, Thomson , HALL, Ralph, Stephen
IPC分类号： G01J5/06
CPC分类号： G01J5/06
摘要： An infrared optical system (100) incorporates a lens (118) imaging a remote scene onto a detector (112) within a cold shield (114). Stray radiation incident on the detector (112) is reduced by an optical stop in the form of a light emitting diode (LED) (126) producing negative luminescence. The LED (126) emits less radiation than background, and contributes less to the detector photon noise than an optical stop not exhibiting negative luminescence.

3. 发明公开

EP0842581A1 THERMAL SENSING SYSTEM HAVING A FAST RESPONSE CALIBRATION DEVICE 失效
标题翻译：具有快速反应性校准装置热测量DEVICE
公开(公告)号：EP0842581A1
公开(公告)日：1998-05-20
申请号：EP96925850.0
申请日：1996-07-29
申请人： THE SECRETARY OF STATE FOR DEFENCE
发明人： ASHLEY, Timothy , ELLIOTT, Charles, Thomas , GORDON, Neil, Thomson , HALL, Ralph, Stephen
IPC分类号： G01J5 , H04N5
CPC分类号： H04N5/3651 , F41G7/001 , F41G7/2253 , F41G7/2293 , H04N5/33
摘要： A thermal sensing system (10) including an array of photon detectors (14) produces a detector-dependent response to irradiation. Variations in individual detector characteristics produce a fixed pattern noise which degrades an image or other response. A switchable mirror (M1) may at one position (Pcal) direct infrared radiation from a light emitting diode (20) onto the detector array (14). The diode (20) is both a negative and positive luminescent emitter; the flux emitted is current controlled to be equivalent to black body radiation at a range of temperatures both colder and hotter than ambient. Calibration relationships comprising transfer functions relating incident intensity to signal response are derived for each detector. Alternatively the mirror (M1) may be at an observation position (Pobs) and infrared radiation from a remote scene reaches the detector array (14). Resulting detector signals are converted into corrected fluxes using individual calibration relationships previously derived and an image or response with reduced fixed pattern noise is obtained.

4. 发明公开

EP0880853A1 THERMAL IMAGING SYSTEM 失效
标题翻译：热成像系统
公开(公告)号：EP0880853A1
公开(公告)日：1998-12-02
申请号：EP96931886.0
申请日：1996-09-24
申请人： THE SECRETARY OF STATE FOR DEFENCE
发明人： ASHLEY, Timothy , ELLIOTT, Charles, Thomas , GORDON, Neil, Thomson , HALL, Ralph, Stephen
IPC分类号： G01J5 , H04N5
CPC分类号： H04N5/33 , G01J5/522 , H04N5/3651
摘要： A thermal imaging system (10) which is accoupled and operates by scanning recreates a thermal image by superimposing measured variations in infrared emission from a scene (22) onto a reference level supplied by a light emitting diode (28). The diode (28) is both a positive and negative luminescent emitter; emitted flux is current controlled to be equivalent to black body radiation at a range of temperatures which may be colder or hotter than ambient. A signal generated when the system (10) switches between scene and diode observation is a measure of the difference between the mean scene temperature and the diode effective temperature. In response to this digital, control means adjust the bias current through the diode (28) in order to reduce the temperature difference. The reference temperature converges towards the mean scene temperature as this process is repeated. Absolute temperature is thus restored and some image defects removed.

5. 发明公开

EP0852818A1 DYNAMIC INFRARED SCENE PROJECTOR 失效
标题翻译：动态红外场景投射
公开(公告)号：EP0852818A1
公开(公告)日：1998-07-15
申请号：EP96931903.0
申请日：1996-09-26
申请人： THE SECRETARY OF STATE FOR DEFENCE
发明人： ASHLEY, Timothy , ELLIOTT, Charles, Thomas , GORDON, Neil, Thomson
IPC分类号： G01M11 , H01L31 , H01L33
CPC分类号： H01L33/28
摘要： A dynamic infrared scene projector for use infrared detections systems which has particular, although not exclusive, use in thermal imaging or seeker systems. In such systems, a dynamic infrared scene projector is used to simulate the thermal scene for testing and calibration purposes. The device comprises an array of electroluminescent semiconductor diode structures, capable of emitting both positive and negative luminescence, and electronic circuitry for supplying currents of both polarity to each diode independently so that the emission of positive and negative luminescence can be controlled. The diode structures in the array are based on narrow bandegap semiconductor materials, for example, the Hg1-xCdxTe, In1-xAlxSb, Hg1-xZnxTe or In1-xTlxSb materials systems (where x is the composition). In a preferred embodiment, the diodes are capable of emitting infrared radiation in the wavelength regions between 3-5 νm or 8-13 νm. By utilizing the negative luminescence properties of the diode structures, the dynamic infrared scene projector can simulate a wide range of temperatures, and in particular low temperatures, without external cryogenic cooling. The dynamic infrared scene projector also permits the use of faster thermal imager frame rates than are achievable with existing systems.

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