[특허]Apparatus for measuring surface movement of an object that is subjected to external vibrations

Apparatus for measuring surface movement of an object that is subjected to external vibrations 원문보기

IPC분류정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	G01B-009/02
출원번호	US-0381201 (1995-01-31)
발명자 / 주소	Kotidis Petros A. (Waban MA) Woodroffe Jaime A. (North Reading MA) Rostler Peter S. (Newton MA)
출원인 / 주소	Textron Defense Systems, Division of Avco Corporation (Wilmington MA 02)
인용정보	피인용 횟수 : 17 인용 특허 : 0

초록 ▼

A system for non-destructively measuring an object and controlling industrial processes in response to the measurement is disclosed in which an impulse laser generates a plurality of sound waves over timed increments in an object. A polarizing interferometer is used to measure surface movement of the object caused by the sound waves and sensed by phase shifts in the signal beam. A photon multiplier senses the phase shift and develops an electrical signal. A signal conditioning arrangement modifies the electrical signals to generate an average signal correlated to the sound waves which in turn is correlated to a physical or metallurgical property of the object, such as temperature, which property may then be used to control the process. External, random vibrations of the workpiece are utilized to develop discernible signals which can be sensed in the interferometer by only one photon multiplier. In addition the interferometer includes an arrangement for optimizing its sensitivity so that movement attributed to various waves can be detected in opaque objects. The interferometer also includes a mechanism for sensing objects with rough surfaces which produce speckle light patterns. Finally the interferometer per se, with the addition of a second photon multiplier is capable of accurately recording beam length distance differences with only one reading.

대표청구항 ▼

Apparatus for measuring surface movement of an object in response to a plurality of periodically spaced externally generated sound waves traveling in said object, said object subjected to externally generated vibrations of a lower frequency than said sound waves, said apparatus comprising; optical homodyne interferometer means that comprises, a) a source of light which is linearly polarized; b) means for splitting said light from said source into a signal beam directed to and from said object and a reference beam; c) means for generally elliptically polarizing at least one of said signal beam and said reference beam; d) means for combining said signal beam and said reference beam into a resultant beam to produce an interference light pattern; e) means for periodically measuring the intensity of said resultant beam and generating a plurality of signals, each signal indicative of the phase of said signal beam in said resultant beam; and f) signal conditioning means for squaring, summing and averaging said signals to produce a signal indicative of the speed of said sound waves in said object and to also compensate for a variation in an operating point of said optical homodyne interferometer means due to said externally generated vibrations.

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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 for measuring surface movement of an object that is subjected to external vibrations 원문보기

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Apparatus for measuring surface movement of an object that is subjected to external vibrations 원문보기

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이 특허를 인용한 특허 (17)

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