Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1987-06-24
1989-01-17
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
356436, G01N 1506
Patent
active
047989653
ABSTRACT:
An optical autocollimation measuring apparatus has a light transmitter-receiver arranged in a housing (15). An image of the light source (11) is formed in the objective (12) by a condensor (9) through the beam divider (20). The objective (12) in turn forms an image of the exit pupil of the condensor (9) in the plane of the retroreflector via the measuring path (13). The retroreflector (14) reflects the incident light beam substantially back on itself to the housing (15) of the light transmitter-receiver, where the received light beam is deflected by the beam divider (20) to a photoreceiver (21). A deflecting mirror (16) is located between the front objective (12) and the measuring path (13) and consists of two parts which are pivotable relative to one another, about a pivot axis (25) extending perpendicular to the optical axis (17), from an extended position into a position in which they are displaced by 90.degree. relative to one another. A suitable aperture diaphragm prevents the abutting edges of the two parts of the deflecting mirror being struck by the transmitted light beam.
REFERENCES:
patent: 2505505 (1950-04-01), Sachtleber
patent: 2562181 (1951-07-01), Frommer
patent: 3885162 (1975-05-01), Geertz
patent: 4001595 (1977-01-01), Reisman
patent: 4536091 (1985-08-01), Allington
Fetzer Gunter
Smetana Klaus
Erwin Sick GmbH - Optik-Elektronik
Nelms David C.
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