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Automatic Reading of Spectrum Lines

IP.com Disclosure Number: IPCOM000096198D
Original Publication Date: 1963-Jan-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 36K

Publishing Venue

IBM

Related People

Cooney, JO: AUTHOR [+3]

Abstract

Light emitted from a source, the spectral pattern of which is to be examined, is indicated as being directed along path 10 for impingement upon diffraction grating 11. The spectral light pattern emitted by grating 11 is directed towards special light sensor 12. This comprises a plurality of individual light responsive elements arranged in an equally spaced manner longitudinal to the extent of the spectral pattern. Thus, when a given spectral pattern, composed of light and dark lines, impinges upon the active surface of sensor 12, the bright line portions stimulate certain of the individual light responsive elements. Such provide a plurality of individual signals collectively forming a coded representation of the spectrum pattern.

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Automatic Reading of Spectrum Lines

Light emitted from a source, the spectral pattern of which is to be examined, is indicated as being directed along path 10 for impingement upon diffraction grating 11. The spectral light pattern emitted by grating 11 is directed towards special light sensor 12. This comprises a plurality of individual light responsive elements arranged in an equally spaced manner longitudinal to the extent of the spectral pattern. Thus, when a given spectral pattern, composed of light and dark lines, impinges upon the active surface of sensor 12, the bright line portions stimulate certain of the individual light responsive elements. Such provide a plurality of individual signals collectively forming a coded representation of the spectrum pattern. Interpreter 13 operates on the coded signals for decoding and identifying the material, or materials, giving rise to the particular spectral pattern.

Sensor 12 has its individual light sensing elements 14 arranged in a stair-step manner with adjacent slanted columns fitted closely together. The individual slanted columns S of elements 14 are sequentially activated during operation. That is, all elements in a given slant column are activated simultaneously. Common readout is provided for each horizontal line of elements H. Interpretation of those particular elements which are irradiated by the spectral pattern is provided through logic circuitry of devices 13. This distribution provides a highly accurate in...