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Method for Accurately Calibrating a Spectrometer Using Broadband LightA novel method has been developed for performing very fine calibration of a spectrometer. This process is particularly useful for modern miniature charge-coupled device (CCD) spectrometers where a typical factory wavelength calibration has been performed and a finer, more accurate calibration is desired. Typically, the factory calibration is done with a spectral line source that generates light at known wavelengths, allowing specific pixels in the CCD array to be assigned wavelength values. This method is good to about 1 nm across the spectrometer s wavelength range. This new method appears to be accurate to about 0.1 nm, a factor of ten improvement. White light is passed through an unbalanced Michelson interferometer, producing an optical signal with significant spectral variation. A simple theory can be developed to describe this spectral pattern, so by comparing the actual spectrometer output against this predicted pattern, errors in the wavelength assignment made by the spectrometer can be determined.
Document ID
20120006651
Document Type
Other - NASA Tech Brief
Authors
Simmons, Stephen
(NASA Kennedy Space Center Cocoa Beach, FL, United States)
Youngquist, Robert
(NASA Kennedy Space Center Cocoa Beach, FL, United States)
Date Acquired
August 25, 2013
Publication Date
August 1, 2011
Publication Information
Publication: NASA Tech Briefs, August 2011
Subject Category
Man/System Technology And Life Support
Report/Patent Number
KSC-13331
Distribution Limits
Public
Copyright
Public Use Permitted.

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