rth climate modeling and global impacts of particles and gases in the atmosphere are some of the studies that benefit from the use of spectroradiometers calibrated for spectral irradiance. Spectral irradiance is the optical power incident per unit area of a surface per wavelength interval in typical units of W cm-2 nm-1.Calibrations of the spectroradiometers are performed using spectral irradiance standards traceable to the International System (generally referred to as SI, from the French Le Syst me International d'Unit s) of base units maintained at the National Measurement Institutes (NMI). In the United States the National Institute of Standards and Technology (NIST) is the NMI. NIST issues 1000 W (ANSI designation, FEL) quartz-tungsten halogen lamps as standards of spectral irradiance calibrated from 250 nm to 2400 nm at discrete wavelength intervals.
Citation: Optical Engineering Magazine
Pub Type: Journals
absolute radiometry, radiometer, spectral irradiance, standard lamps