Light collecting arrangement in combination with a light scannin

Details Light collecting arrangement in combination with a light scannin Light collecting arrangement in combination with a light scannin

1981-02-17

1984-07-10

Arnold, Bruce Y.

Optics: measuring and testing

Range or remote distance finding

With photodetection

356431, G03H 100, G01N 2101

Patent

active

044589794

ABSTRACT:
A light collecting arrangement particularly for use with beam scanning apparatus for monitoring for faults in web material has a diffraction grating 11 and a light collecting surface usually in the form of photoelectric converter 19 arranged at right angles to the diffraction grating 11. The characteristics of the diffraction grating 11 are so selected that only light incident within a predetermined range is deflected to the light collecting surface. A number of different arrangements are disclosed. The light collecting arrangement can, for example, be used with a scanning light beam which is continuously displaced parallel to itself to effect point by point line by line scanning of the web material 17 or can take the form of a scanning light beam which executes a sector-like scanning movement. In the former case the diffraction grating should have a fixed grating constant in the latter case the grating constant should change along the length of the diffraction grating to compensate for the different angles of incidence which arise as a result of the sector-like movement of a scanning light beam. The diffraction grating 11 is conveniently in the form of a hologram and can conveniently be incorporated in a light conducting rod 14.

REFERENCES:
patent: 3728117 (1973-04-01), Heidenhain et al.
patent: 3743376 (1973-07-01), Russell
Sincerbox, G. T., IBM Technical Disclosure Bulletin, "Formation of Optical Elements by Holography", vol. 10, No. 3, Aug. 1967.

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