[특허]Optical electronic distance measuring apparatus with movable mirror

Optical electronic distance measuring apparatus with movable mirror 원문보기

IPC분류정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	G01C-003/08 G01C-003/00 G01B-011/26 G01B-011/24
출원번호	US-0068543 (1993-05-27)
발명자 / 주소	Payne John M. (Tucson AZ) Parker David H. (Arborvale WV) Bradley Richard F. (Stanardsville VA)
출원인 / 주소	Associated Universities, Inc. (Washington DC 02)
인용정보	피인용 횟수 : 108 인용 특허 : 0

초록 ▼

A rangefinder system employs three laser rangefinders for determining three dimensional coordinates, each rangefinder using a steerable mirror for aiming the rangefinder beams at a series of retroreflectors. The beams are modulated at 1.5 GHz. The system includes a signal at an offset frequency of 1 kHz for phase detection. A digital phase detector under control of a local computer, as is the mirror, computes phase difference which is used to measure the distances to the retroreflectors. Correction is made for zero point phase drift of the circuit of each rangefinder and a benchmark reference to a distant retroreflector corrects for atmospheric effects on the measurements. A central computer directs the implementation of the tasks of the local computers of each rangefinder and computes and displays trilateration computation results made from the three rangefinders. The system can measure the distance to five different points per second with ranges up to 120 m at all accuracy of about 50 m

대표청구항 ▼

An electronic optical distance measuring apparatus comprising: a plurality of targets mounted on a support frame, said support frame being mounted to ground; three rangefinders arranged in a triangle and mounted on said support frame for measuring distance between said rangefinders and each of said targets, each of said rangefinders including: means for generating a modulated optical signal at a given modulation frequency; means for automatically successively transmitting the optical signal from a reference location to said plurality of targets each of which reflects the received transmitted signal; means for receiving the successively reflected signals from each of said targets at said reference location and for detecting the received signals wherein the detected signals each have a phase difference with the transmitted signal manifesting the distance between the target corresponding to that detected signal and the reference location; means for determining the phase difference between said detected signals and said transmitted signal and generating a phase difference signal for each said detected signals; and means responsive to each of said phase difference signals for automatically determining the distance from said reference location to each said targets from said determined phase difference; and at least two of said rangefinders also being aimable at each of the other rangefinders for measuring respective distances between all said rangefinders to measure said triangle thereof; and a central computer for controlling said rangefinders and effective for computing by trilateration coordinates of each of said targets based on said measured distances between said rangefinders and said targets, and based also upon coordinates of each of said rangefinders to a reference point relative to said ground.

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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

Optical electronic distance measuring apparatus with movable mirror 원문보기

초록 ▼

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연구과제 타임라인

이 특허를 인용한 특허 (108)

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Optical electronic distance measuring apparatus with movable mirror 원문보기

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연구과제 타임라인

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이 특허를 인용한 특허 (108)

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