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Ultraviolet Radiation Group

Welcome

The Ultraviolet Radiation Group provides the basis for high accuracy radiometry and for a variety of other specialized measurements in the ultraviolet and soft x-ray spectral range from 2 nm to 400 nm.

Radiometric Standards

  • Detector responsivity scale realization traceable to the International System of Units (SI) standards through electrical substitution radiometry to maintain the National radiometric standard in the ultraviolet wavelength region
  • Dissemination of ultraviolet radiometric standards through calibrated detectors
  • Maintenance and operation of the NIST Synchrotron Ultraviolet Radiation Facility (SURF III) as an absolutely calibrated irradiance standard source

Activities

Programs/Projects

Use of a laser-driven plasma source in ultraviolet-detector calibrations—The National Institute of Standards and Technology operates two spectral comparator facilities, both of which are used to provide detector calibrations from the ultraviolet to the near-infrared …

Quantum Dot coated CMOS CID arrays for the UV and VUV—A technique has been developed for coating commercial off the shelf (COTS) detector arrays with a thin, uniform layer of quantum dots. The quantum deposition is accomplished using an Optomec …

EUV Detector Calibrations—Transfer standard photodiodes may be purchased with a calibration in the range from 5 nm to 254 nm. Other detectors supplied by the customer may be calibrated if they are suitable for use as …

Geostationary Operations Environment Satellite R-Series Program (GOES-R) Extreme UV/X-ray Irradiance Sensor (EXIS) Calibration—Calibrations of the The Extreme ultraviolet/X-ray Irradiance Sensor (EXIS), which will be installed on the Geostationary Operations Environment Satellite R-Series (GOES-R) are performed using …

Photodetector Analysis for Biological Agent Detection—Photomultiplier tube (PMT) analysis with respect to PMT sensitivity and long-term stability using synchrotron radiation.

NIST Lyman-Alpha Neutron Detector (LAND)—The well-known interaction of low-energy neutrons and 3He produces a proton and a triton with 764 keV of kinetic energy shared between the two particles. For many years, this reaction has been used …

Synchrotron Radiation-Based Calibrations for Space Weather Prediction—Orbital ultraviolet and extreme-ultraviolet spectrometers are calibrated on beamline 2, taking advantage of the calculability of synchrotron radiation.

Bilateral Comparison of Spectral Responsivity in the Vacuum-Ultraviolet—To compare the calibration capabilities for the spectral responsivity in the vacuum-ultraviolet spectral region between 135 nm and 250 nm, PTB and NIST agreed on a bilateral comparison. …

Long-Term Monitoring of the Ultraviolet Irradiance Scale—In 2004, the National Institute of Standards and Technology NIST established the ultraviolet spectral irradiance scale from 200 nm to 400 nm using the calculable irradiance of the Synchrotron …

Vacuum-Ultraviolet Optical Properties of Cryogenic Water Ices—The optical properties of cryogenic water ices in the vacuum-ultraviolet spectral range are studied.

Synchrotron Radiation-based Ultraviolet Source Calibrations—Bilateral comparison of synchrotron radiation-based deuterium lamp calibrations between the Physikalisch-Technische Bundesanstalt PTB and NIST.

NIST Calibration of SDO/EVE/ESP Rocket Instrument—NASA launched the Solar Dynamics Observatory (SDO) satellite on 11 Feb 2010 on a mission to study the sun. The EUV Variability Experiment (EVE) on SDO contains the Extreme Ultraviolet …

Highlights
A compilation of solar data from various instruments on SDO recording a flare on May 5, 2010.

Images and Spectra of a solar flare taken from the Solar Dynamics Observatory (SDO) Mission launched in February 2010. Top three panels (l to r): Images showing magnetic loops of the solar flare taken at 9.4 nm, 33.5 nm, and 17.1 nm, respectively, taken by the Atmospheric Imaging Assembly (AIA) aboard the SDO; Fourth panel: graphic related to magnetic field strength at the flare taken by the Helioseismic and Magnetic Imager (HMI). Bottom: Time history of flare emission at 9.4 nm and 33.5 nm taken by the Extreme-Ultraviolet Variability Experiment (EVE) instrument. The initial calibration of EVE and the periodic recalibrations through a duplicate EVE on rocket underflights were done at SURF III. The AIA is periodically cross calibrated against EVE.

 
Products and Services
Contact

Ultraviolet Radiation Group:
Thomas Lucatorto, Group Leader
301-975-3734 Telephone

Christina Brown, Secretary
301-975-3727 Telephone

100 Bureau Drive, M/S 8411
Gaithersburg, MD 20899-8411