Title :
Responsivity calibration methods for 365-nm irradiance meters
Author :
Larason, Thomas C. ; Brown, Steven W. ; Eppeldauer, George P. ; Lykke, Keith R.
Author_Institution :
Div. of Opt. Technol., Nat. Inst. of Stand. & Technol., Gaithersburg, MD, USA
fDate :
4/1/2001 12:00:00 AM
Abstract :
Two detector-based responsivity calibration methods have been compared at the National Institute of Standards and Technology for ultraviolet irradiance meters in the 365-nm spectral region. Both methods are based on an electrical substitution high-accuracy cryogenic radiometer, but utilize different facilities and transfer standards. One facility is a monochromator-based spectral-power responsivity measuring system utilizing an aperture-scanning method, while the second is a tunable-laser and integrating-sphere source system using a light-trapping silicon transfer detector with a known aperture area. The first reported comparison of these two fundamentally different methods agreed to 1%-2% near the peak and long wavelength side of the bandpass curves which is comparable to their expanded (k=2) uncertainties
Keywords :
calibration; photodetectors; photometers; photometry; transfer standards; 365 nm; SIRCUS facility; aperture-scanning method; bandpass curves; detector-based methods; electrical substitution radiometer; expanded uncertainties; high-accuracy cryogenic radiometer; integrating-sphere source; light-trapping silicon transfer detector; monochromator-based system; photodetectors; responsivity calibration methods; spectral-power responsivity measuring system; transfer standards; tunable-laser; ultraviolet irradiance meters; Area measurement; Argon; Calibration; Cryogenics; Mirrors; NIST; Optical filters; Particle measurements; Photodetectors; Radiometry;
Journal_Title :
Instrumentation and Measurement, IEEE Transactions on
