[특허]Apparatus and method for ice detection

Apparatus and method for ice detection 원문보기

IPC분류정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	G02F-001/01
출원번호	US-0922873 (1992-07-31)
발명자 / 주소	Blackwood Carl I. R. (Campbell CA)
출원인 / 주소	Loral Aerospace Corp. (New York NY 02)
인용정보	피인용 횟수 : 35 인용 특허 : 0

초록 ▼

An apparatus and method that accurately and reliably detects ice on a target surface (20). Intrinsic birefringent properties of hexagonal ice crystals are used to detect ice by analyzing elliptically-polarized reflection of linearly-polarized radiation from ice. A linearly-polarized radiation beam (15) is focused on the target surface (20), and returned radiation (25) is filtered (30) as a function of its elliptical polarization. Filtered radiation (35) is directed to a sensor (40) and quantified according to the intensity of radiation received at various points (411-41n) on the filter (30), and an output signal for each point is produced (451-45n). The presence or formation of ice is determined by a signal processor (50) that detects the variance among the output signals (451-45n)－a variance (55) reaching a threshold value being indicative of ice. Filtering unit (30) may be composed of two polarizing filters (31 and 33), rotatable with respect to each other on a common axis and disposed in a parallel plane therewith. A reading is taken from all the output signals (451-45n), and an output signal variance (55) is calculated. The filters (31 and 33) are then rotated with respect to each other (e.g., several degrees), another reading is taken, and another variance (55) is calculated. This read-calculate-rotate cycle is repeated continuously. Thus, this embodiment is more accurate since it relies on a greater number of samples, and such samples are taken over numerous time periods. Also, because the output from the filter (33) is dynamically changing as the two filters (31 and 33) are rotated, the presence of ice is easier to detect visually.

대표청구항 ▼

An apparatus for detecting the presence of ice on a target, said apparatus comprising: a transmitter for transmitting linearly-polarized radiation toward the target; a filter for filtering said radiation returned from the target, wherein the filter outputs filtered radiation that is a function of the elliptical polarization of said returned radiation; a sensor for receiving the filtered radiation, comprising a plurality of elemental sensors that each produce an output signal that is a function of the filtered radiation received by the elemental sensor; and, coupled to the sensor, a signal processor for determining the variance among the output signals, wherein the signal processor declares the presence of ice when the variance reaches a threshold value.

이 특허를 인용한 특허 (35)

Pernick Benjamin J., Aircraft ice detecting system.
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Gagnon Robert E. (St. John\s CAX), Apparatus and method for remote detection of ice or other birefringent material on a surface.
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Reams, William, Apparatus and methods for snow and ice detection and removal on a communication antenna.
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Schoeffler Daniel ; Stern Howard ; Costa Pat V., Apparatus for detecting a polarization altering substance on a surface.
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Greene, Leonard M., Automatic recycling ice detector.
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Greene, Leonard M., Automatic recycling ice detector.
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Fridthjof, Jack, Device for detection of surface condition data.
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Olsen,Ronald F.; Breer,Marlin D., Flow restrictors for aircraft inlet acoustic treatments, and associated systems and methods.
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Hackmeister Richard, Icing detector for aircraft.
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Zhao,Dong; Andel,Paul Cameron; McGuire,Brian, Inflight ice detection system.
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Shah, Anil D.; Gupta, Alankar, Method and apparatus for detecting conditions conducive to ice formation.
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Shah,Anil D.; Gupta,Alankar, Method and apparatus for detecting conditions conducive to ice formation.
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Friddell,Stephen D.; Prichard,Alan K., Method and apparatus for liquid containment, such as for aircraft fuel vessels.
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Ray, Mark; Anderson, Kaare Josef, Method of estimating cloud particle sizes using LIDAR ratio.
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Cook, Donald E.; Feider, Michael P., Methods and systems for detecting icing conditions.
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Hayden, Chris; Jurczyszak, Eric R.; Hankins, Jeff, Next generation bare wire water heater.
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Hayden, Chris; Jurczyszak, Eric R.; Hankins, Jeff, Next generation bare wire water heater.
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Hartman, Michael James; Barnett, Bruce Gordon; Hershey, John Erik; Dell'Anno, Michael Joseph; Soro, Stanislava, Street lighting control, monitoring, and data transportation system and method.
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Burns Joseph D. ; Anderson Mark V., Substance detection system and method.
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Hartman, Michael James; Hershey, John Erik; Dell'Anno, Michael Joseph; Soro, Stanislava; Barnett, Bruce Gordon, System and method for monitoring street lighting luminaires.
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Anderson Roger D. ; Woytassek Mark A., System for detecting ice on an aircraft.
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Stern Howard (Greenlawn NY), System for detecting ice or snow on surface which specularly reflects light.
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Stern Howard ; Schaefer John ; Maali Fereydoun, System for detecting ice or snow on surface which specularly reflects light.
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Stern Howard ; Schaefer John ; Maali Fereydoun, System for detecting ice or snow on surface which specularly reflects light.
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Hayden, Christopher Mark; Jurczyszak, Eric Robert; Mihu, Sergiu Gabriel; Corcoran, Richard Joseph; Bolleyer, Jens; Hankins, Jeffrey Dean, Tankless electric water heater.
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IPC	Description
A	생활필수품
A62	인명구조; 소방(사다리 E06C)
A62B	인명구조용의 기구, 장치 또는 방법(특히 의료용에 사용되는 밸브 A61M 39/00; 특히 물에서 쓰이는 인명구조 장치 또는 방법 B63C 9/00; 잠수장비 B63C 11/00; 특히 항공기에 쓰는 것, 예. 낙하산, 투출좌석 B64D; 특히 광산에서 쓰이는 구조장치 E21F 11/00)
A62B-1/08	.. 윈치 또는 풀리에 제동기구가 있는 것

내보내기 구분	파일저장 인쇄 메일전송
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Apparatus and method for ice detection 원문보기

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Apparatus and method for ice detection 원문보기

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