[특허]Particle path determination system

Particle path determination system 원문보기

IPC분류정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	G01B-011/00
출원번호	US-0682752 (1991-04-08)
발명자 / 주소	Batchelder John S. (Somers NY) DeCain Donald M. (New York NY) Hobbs Philip C. D. (Briarcliff Manor NY) Taubenblatt Marc A. (Pleasantville NY)
출원인 / 주소	International Business Machines Corporation (Armonk NY 02)
인용정보	피인용 횟수 : 26 인용 특허 : 0

초록 ▼

A bright-field, particle position determining optical system is disclosed that uses both phase shift and extinction signals to determine particle trajectories. In a first embodiment, a pair of orthogonally polarized beams are positioned along an axis that intersects a particle\s flow path at an acute angle. An optical system recombines the beams after they exit the flow path, the combined beams manifesting an elliptical polarization if a particle intersects one of the beams. Bright field detectors detect polarization components of the combined beam, provide a phase shift signal between the beam\s orthogonal components and provide corresponding signals to a processor. The processor determines a signal asymmetry from the phase shift signal that is indicative of a particle\s position in the flow path. Another embodiment of the invention examines a signal resulting from the beam\s phase shift and determines a correction factor that is dependent upon the distance of the particle from the focal plane of the beams. Another embodiment employs a dithering system for cyclically moving one or more optical beams across a particle to further enable its trajectory or position to be determined.

대표청구항 ▼

An apparatus for determining a particle\s position in a flow path having a determinable direction comprising: means for transmitting to a flow path, first and second substantially parallel optical beams, said beams being initially mutually coherent but of different polarizations, said second beam offset from said first beam along an axis that intersects said determinable direction at an acute twist angle, a particle that passes through a beam inducing a phase shift in said beam that decreases as the distance increases of the particle from said beam\s optical axis; recombining means positioned in a path which said beams take after departing from said flow path, for combining said beams, a phase shift in a said beam causing said combined beam to manifest an elliptical polarization exhibiting first and second polarization axes; detector means for sensing an intensity of one of said elliptical polarization axes to provide a phase shift signal; and processing means for accumulating phase shift signals resulting from a particle\s travel in said flow path past said first and second beams, and subtracting a phase shift signal derived from said first beam from a phase shift signal derived from said second beam to determine an asymmetry value indicative of said particle\s position in said flow path.

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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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Particle path determination system 원문보기

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Particle path determination system 원문보기

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이 특허를 인용한 특허 (26)

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