Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1978-12-15
1980-10-07
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
356319, 356326, 350 691, G01D 534, G01J 342
Patent
active
042270790
ABSTRACT:
A beam directing device is provided which employs one or more mirrors mounted on a single rotatable shaft. The orientation of the shaft controls the rotational orientation of these directing mirror(s) to direct the beam toward any of a number of sample or reference cells. Behind each cell is a cube corner which reflects the beam back to the directing mirror(s) for reflection toward the detector. In one embodiment, a shaft encoded senses the orientation of the shaft, the encoder output being servoed against a position signal to coarsely rotate the shaft in order to direct the beam to a sample cell and thence to a spectrograph slit. A pair of slit diodes detect the beam overlap on each side of the slit and their output is used to accurately position the beam on the slit to within one second of arc and correct for deviations in beam direction.
REFERENCES:
patent: 2705434 (1955-04-01), Hansen
patent: 3520625 (1970-07-01), Gillieron et al.
patent: 3765742 (1973-10-01), Walles
patent: 3859617 (1975-01-01), Oka et al.
patent: 3892961 (1975-07-01), Bachmann
Bryson, III Charles E.
Dukes John N.
Weber Lynn
Frazzini John A.
Grubman Ronald E.
Hewlett--Packard Company
Nelms David C.
Westin Edward P.
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