[특허]Upconverting and time-gated two-dimensional infrared transillumination imaging

Upconverting and time-gated two-dimensional infrared transillumination imaging 원문보기

IPC분류정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	G01N-021/25 G01N-021/47 A61B-006/00
출원번호	US-0215123 (1994-03-18)
발명자 / 주소	Faris Gregory W. (Menlo Park CA)
출원인 / 주소	SRI International (Menlo Park CA 02)
인용정보	피인용 횟수 : 55 인용 특허 : 0

초록 ▼

A method and apparatus for direct two-dimensional transillumination imaging of a sample immersed in or including a scattering medium at infrared to near-infrared wavelengths. Frequency conversion and time-gating techniques in the infrared and near-infrared range are used to enhance two-dimensional image collection and detection. The apparatus includes a probe radiation source for applying a probe beam in the infrared to near-infrared frequency range to the sample. The probe beam is spread to cover a two-dimensionally extending area of the sample to be imaged. After interacting with the sample, the probe beam is representative of a two-dimensional image of the covered sample area. In one embodiment the apparatus includes a time-gating arrangement for selecting a temporal portion of the probe beam in a narrow time window representative of early arriving photons transmitted through the scattering medium and providing a time-gated beam representative of the two-dimensional image of the sample area. A reference beam interacts with a nonlinear medium to shift the frequency of the probe beam to a different frequency, which may lie outside the infrared to near-infrared range. In many applications of the apparatus the frequency will be shifted upward to a frequency higher than near-infrared. The nonlinear interaction occurs in such a manner so as not to destroy the two-dimensional image carrier by the time-gated beam. A detector operative at the shifted frequency detects the time-gated and frequency-shifted beam to directly record the two-dimensional image.

대표청구항 ▼

Transillumination imaging apparatus for obtaining a two-dimensional image of a sample through a scattering medium, comprising: a probe radiation source for applying a probe beam of radiation to the sample, said probe beam having a frequency in the infrared to near-infrared range; optical means for spreading said probe beam to cover an area of said sample extending in two dimension, wherein said probe beam is representative of a two-dimensional image of said area after interaction with said sample; time-gate means for selecting a temporal portion of said probe beam in a narrow time window representative of early arriving photons transmitted through said scattering medium and providing a time-gated beam representative of a two-dimensional image of said sample area; wherein said time-gate means comprises: a reference radiation source providing a reference beam of radiation at a reference frequency directed along an optical path that avoids said sample and said scattering medium, said reference frequency being higher than said infrared to near-infrared range; and coupling means for collinearly mixing said reference beam and said probe beam after interaction with said sample to provide said time-gated beam; means for adjusting the length of said reference beam optical path so as to adjust the length of the narrow time window of the selected temporal portion of said probe beam; upconversion means for shifting said time-gated beam to an upcoversion frequency higher than said probe beam frequency without destroying said two-dimensional image; and a detector operative at said upconversion frequency for detecting said upconverted time-gated beam representative of said two-dimensional image at said upconversion frequency.

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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

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연합인증

Upconverting and time-gated two-dimensional infrared transillumination imaging 원문보기

초록 ▼

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Upconverting and time-gated two-dimensional infrared transillumination imaging 원문보기

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연구과제 타임라인

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이 특허를 인용한 특허 (55)

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