Optical wavelength division multiplexing of digital encoder trac

Details Optical wavelength division multiplexing of digital encoder trac Optical wavelength division multiplexing of digital encoder trac

1988-06-24

1989-07-18

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

250231SE, 250237G, 341 13, G01J 350, H01J 314, G01D 534

Patent

active

048496243

ABSTRACT:
An optical sensor comprising an encoder having a plurality of tracks, and illumination means for illuminating each track with an optical input signal that includes a plurality of wavelength components. Each wavelength component comprises light in a wavelength range different from the wavelength ranges of the other components. Each track includes means for modulating the input signal, and for dispersing the input signal to produce a plurality of spatially dispersed output signals. Each output signal comprises one of the wavelength components. Output signals having different wavelength components from different tracks are combined to produce a composite output signal, such that each wavelength component in the composite output signal is modulated by a different track. The output signal may therefore be demultiplexed to produce information indicating the position of the encoder. The encoder preferably comprises a masked diffraction grating. A second embodiment in which the encoder comprises a prism is also described.

REFERENCES:
patent: 3587063 (1971-06-01), Lamberts et al.
patent: 3609010 (1971-09-01), Mueller
patent: 3702725 (1972-11-01), Macovski
patent: 3703640 (1972-11-01), Broussaud et al.
patent: 3929398 (1975-12-01), Bates
patent: 4007989 (1977-02-01), Wajda
patent: 4111524 (1978-09-01), Tomlinson III
patent: 4146783 (1979-03-01), Desbois et al.
patent: 4148556 (1979-04-01), Sauter et al.
patent: 4153330 (1979-05-01), Tomlinson III
patent: 4155627 (1979-05-01), Gale et al.
patent: 4198117 (1980-04-01), Kobayashi
patent: 4211918 (1980-07-01), Nyfeler et al.
patent: 4223216 (1980-09-01), Quick et al.
patent: 4303341 (1981-12-01), Kleinknecht et al.
patent: 4334152 (1982-06-01), Dakin et al.
patent: 4362359 (1982-12-01), Dammann et al.
patent: 4408123 (1983-10-01), Sichling et al.
patent: 4441181 (1984-04-01), Winzer et al.
patent: 4470688 (1988-04-01), Edwards
patent: 4517456 (1985-05-01), Halsall et al.
patent: 4528448 (1985-07-01), Doggett
patent: 4546466 (1985-10-01), Lopiccolo
patent: 4622663 (1986-11-01), Ishikawa et al.
patent: 4643519 (1987-02-01), Bussard et al.
patent: 4652080 (1987-03-01), Carter et al.
patent: 4740688 (1988-04-01), Edwards
patent: 4778273 (1988-10-01), Michel

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