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US 7,649,627 B2Granted
Wavelength calibration method and wavelength calibration apparatus
AssigneeYokogawa Electric Corporation
InventorToshikazu Yamamoto
Life of this patent
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Abstract
In a wavelength calibration method, an observed spectrum of a light that has a wavelength band is obtained, wherein the light has at least an attenuated wavelength component that corresponds to at least a predetermined absorption wavelength that is included in the wavelength band. A corrected spectrum is then obtained from the observed spectrum, wherein the corrected spectrum has reduced dependencies upon the full width at half maximum of an emission band of the light and upon an intensity ripple period of the light.
Claims16
A wavelength calibration method comprising:
- obtaining an observed spectrum of a light that has a wavelength band, the light having at least an attenuated wavelength component that corresponds to at least a predetermined absorption wavelength that is included in the wavelength band;
- obtaining a corrected spectrum from the observed spectrum, the corrected spectrum having reduced dependencies upon the full width at half maximum of an emission band of the light and upon the intensity ripple period of the light;
- and
- performing a wavelength calibration with reference to the corrected spectrum.
1 more element
A wavelength calibration apparatus comprising:
- an optical system configured to obtain a wavelength-separated light from a light, the light has a wavelength band, the light having at least an attenuated wavelength component that corresponds to at least a predetermined absorption wavelength that is included in the wavelength band;
- and
- a control system configured to obtain an observed spectrum of the light from the wavelength-separated light, the control system being configured to obtain a corrected spectrum from the observed spectrum, the corrected spectrum having reduced dependencies upon the full width at half maximum of an emission band of the light and upon an intensity ripple period of the light, the control system being configured to perform a wavelength calibration with reference to the corrected spectrum.
Dependencies are inferred from the claim text.