Optics: measuring and testing – Fiducial instruments
Patent
1973-02-08
1978-09-05
McGraw, Vincent P.
Optics: measuring and testing
Fiducial instruments
356153, 356172, G01C 500, G01B 1126
Patent
active
041115643
ABSTRACT:
A reference plane producing method and system wherein a substantially collimated beam of electromagnetic radiation, for example, a laser beam, is reflected to simultaneously disperse the beam in different directions to form a thin plane of such radiation which can be used, for example, as a construction reference line. In a preferred embodiment a primary cone having its apex projecting towards the incident beam and its optical axis coaxial with the incident beam is used to reflect the beam of light. Various embodiments of a basic apparatus having integral or separate collimating and leveling devices are described. The preferred source of radiant energy is a laser, most preferably a second-mode laser having a donut or annular shaped beam and is projected against an axially aligned conical reflecting surface. The conical surface can be a female cone formed by axially drilling into a transparent transmission tube, such as the emission end of a fiber-optic transmission system.
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patent: 3189744 (1965-06-01), Ogland
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patent: 3393321 (1968-07-01), Frungel
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patent: 3609584 (1971-09-01), Stitch
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patent: 3820903 (1974-06-01), Kindl et al.
"Progress in Optics, vol. I" edited by Wolf; North Holland Pub. Co., Amsterdam; 1961, pp. 316-318.
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