Spectrophotometer

Details Spectrophotometer Spectrophotometer

2006-04-11

2006-04-11

Evans, F. L. (Department: 2877)

Optics: measuring and testing

By dispersed light spectroscopy

Utilizing a spectrophotometer

C356S328000, C356S334000

Reexamination Certificate

active

07027151

ABSTRACT:
In a spectrophotometer, the following formula is stored in advance as a correction formula of a rotation angle in a correction formula storing portion; θ′=θ+A•sin (C1•θ+θa)+B•sin (C2•θ+θb)+θc, wherein C1, C2represent coefficients theoretically determined in advance by a structure of a reduction mechanism, and A, B, θa, θb, θc are coefficients specific to the reduction device which are calculated based on measurement results of a plurality of bright line spectrums through fittings by a coefficient determining portion. In case a sample is measured actually, when a desired wavelength is set, a rotation angle correcting portion corrects a rotation angle θ corresponding to the desired wavelength to calculate θ′ by applying the above-stated correction formula, and then, controls a motor so that a diffraction grid is rotated by the angle θ′.

REFERENCES:
patent: 5096295 (1992-03-01), Krupa et al.
patent: 1-221627 (1989-09-01), None

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