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The wavelength calibration of spectrographs is an essential but challengingtask in many disciplines. Calibration is traditionally accomplished by imagingthe spectrum of a light source containing features that are known to appear atcertain wavelengths and mapping them to their location on the sensor. This istypically required in conjunction with each scientific observation to accountfor mechanical and optical variations of the instrument over time, which mayspan years for certain projects. The method presented here investigates theusage of color itself instead of spectral features to calibrate a spectrograph.The primary advantage of such a calibration is that any broad-spectrum lightsource such as the sky or an incandescent bulb is suitable. This method allowsfor calibration using the full optical pathway of the instrument instead ofincorporating separate calibration equipment that may introduce errors. Thispaper focuses on the potential for color calibration in the field of radialvelocity astronomy, in which instruments must be finely calibrated for longperiods of time to detect tiny Doppler wavelength shifts. This method is notrestricted to radial velocity, however, and may find application in any fieldrequiring calibrated spectrometers such as sea water analysis, cellularbiology, chemistry, atmospheric studies, and so on. This paper demonstratesthat color sensors have the potential to provide calibration with greatlyreduced complexity.

The Use of Color Sensors for Spectrographic Calibration