Controlling light beam spectrum

Optics: measuring and testing – By dispersed light spectroscopy – With synchronized spectrum repetitive scanning

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356326, 356332, G01J 306, G01J 332

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active

046609750

ABSTRACT:
A method and apparatus for controlling the spectral components of a light beam are described. The apparatus comprises means (3-7) for generating a collimated light beam; means (9) for dispersing the collimated beam; a mask (1) including an aperture (2) the size of which is such that a portion of the dispersed beam passes through the aperture in use; and movement means (not shown) for causing relative transverse movement between the light beam and the aperture. A memory (not shown) is provided for storing in use a profile of the relative transverse movement between the light beam and the aperture (2) required to obtain a desired spectral response in the transmitted light beam, the movement means being responsive to the stored profile to cause relative transverse movement in accordance with the predetermined profile.

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patent: 3907430 (1975-09-01), Mann
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Lipsett et al, "Variolluminator (Substrative Double Monochromator with Variable Bandpass)" Applied Optics, vol. 12#4, Apr. 1973, pp. 818-821.
Burch, "Adjustable Bandpass Filter Employing a Prism" Applied Optics, Mar. 1969, vol. 8#3, pp. 649-651.
Talmi, "Applicability of T.V. Type Multichannel Detectors to Spectroscopy" Analyical Chemistry, vol. 47#7, Jun. 1975, pp. 658A-670A.
Greynolds, "Computer-Assisted Design of Well-Baffled Axially Symmetric Optical Systems" SPIE, vol. 193, Optical Systems Engineering (1979), pp. 129-140.

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