Optical transducers with wavelength coding

Details Optical transducers with wavelength coding Optical transducers with wavelength coding

1987-03-12

1988-04-26

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

250227, 250231SE, G01J 350

Patent

active

047406887

ABSTRACT:
An optical transducer has an optical head mounted above an optically encoded reflective disc. Broad band radiation is supplied to the head via a single fibre cable. This head is a solid glass block with a curved reflecting surface that collimates and reflects radiation onto a diffraction grating. Radiation is dispersed by the grating and reflected back onto the curved reflecting surface. This causes the radiation to be focussed onto the disc as a spectrum. The head combines radiation reflected from the disc and focusses it onto the end of an output fibre. A wavelength decoder at the other end of the output fibre disperses the received radiation so that an array of photodiodes provides an output representing the location of the reflective parts of the disc from which the position of the disc is determined. By measuring the separation between two reflective tracks concentricity errors can be removed and displacement of an encoder in two coordinate directions can be measured by measuring the separation and absolute positions of reflected wavelengths.

REFERENCES:
patent: 3482105 (1969-12-01), Hutzler
patent: 4045667 (1977-08-01), Hanson
patent: 4223216 (1980-09-01), Quick et al.
patent: 4334152 (1982-06-01), Dakin et al.
patent: 4517456 (1985-05-01), Halsall et al.

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