General |
- Spectrometer Calibration
Beamline
- Beamline 2 (BL-2) at SURF III is dedicated to spectrometer calibrations,
and provides a standard source of irradiance from 4 nm to 400 nm.
- The XUV Detector Calibration
Beamline at SURF III
- One of the beamlines (BL-9) at SURF III is dedicated to the calibration
of transfer standard detectors in the XUV spectral region from
5 nm to 50 nm.
- Nuclear Power Industry NEI/NIST Measurement
Assurance Program
- Nuclear Energy Institute (NEI) established a Measurement Assurance
Program at NIST to provide sponsoring nuclear utilities, commercial
suppliers of radioactive sources, and service laboratories independent
verifications, traceable to NIST.
- Radiopharmaceutical Industry NEI/NIST Measurement
Assurance Program
- Nuclear Energy Institute (NEI) and the National Institute of Standards
and Technology have cooperated in a measurements assurance program
in the field of nuclear medicine. Participation in the program
allows sponsors an independent verification, traceability to NIST,
of their capability to make accurate radioactivity measurements.
- Mammographic X-Ray
Instrument Calibration Range
- The Ionizing Radiation Division in the Physics Laboratory has
established new national standards for radiation exposure from
x-ray beams used in mammography and has completed new facilities
for calibration of exposure meters in these beams.
- Frequency
Measurement and Analysis Service
- The NIST Frequency Measurement and Analysis Service makes it easy
to measure and calibrate any quartz, rubidium, or cesium frequency
standard. All measurements are made automatically, and are traceable
to NIST at an uncertainty level of ±5 × 10-13
per day. Subscribers to the NIST service receive a complete frequency
measurement system which includes everything needed to make state-of-the-art
frequency measurements that are traceable to NIST.
- NIST
Global Positioning System (GPS) Data Archive
- NIST continuously monitors the Global Positioning System (GPS) satellite
signals from Boulder, Colorado and compares the frequency standard on each
satellite to the NIST frequency standard. The results are published in the
NIST GPS Data Archive. The archived data can be used to support claims of
frequency traceability to NIST through the use of GPS, since the frequency
uncertainty of each satellite is listed. You can use the archive to quickly
check the status of the GPS constellation on any given date. New GPS data
(from the previous day) are added to the archive daily at about 1600 UTC.
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NIST Time Services |
- NIST Web Clock
- See a display of what time it is anywhere in the country. The reference
for the clock is the NIST Time Scale in Boulder, CO.
- Automated
Computer Time Service (ACTS)
- NIST's Automated Computer Time Service (ACTS) has been provided
since 1988 to those users who need to synchronize computer clocks
to the correct time. Using ACTS requires only a computer, a modem,
and some simple software. When a computer connects to ACTS by
telephone, it receives an ASCII time code. The information in
the time code is then used to set the computer's clock.
- NIST Internet
Time Service
- The NIST Internet Time Service allows users to synchronize computer
clocks via the Internet. The time information provided by the
service is directly traceable to UTC(NIST). The service responds
to time requests from any Internet client in several formats including
the DAYTIME, TIME, and NTP protocols.
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Optical Technology
Calibration Services |
- Low Background
Infrared Measurements
- The LBIR Facility is available to service the user community to
characterize infrared radiometric sources, detectors and optical
components in a low background environment. The scientists at
the facility will collaborate for special tests to measure infrared
optical properties of materials, to characterize sources and detectors
and to perform other experiments at cryogenic temperatures.
- Photodetector
Measurements
- This service provides characterized silicon detectors and special
tests of customer supplied detectors. Spectral responsivity and
uniformity measurements are made on photodiodes, detectors, and
radiometers from 200 nm to 1.8 µm.
- Photometric
Measurements
- Various calibration services are now available for luminous intensity,
total luminous flux, illuminance, luminance, and color temperature.
- Radiance
Temperature Measurements
- Measurement of Radiance Temperature of Disappearing Optical Pyrometers,
Ribbon Filament Lamps, and Radiation Thermometers provide access to the
International Temperature Scale of 1990 (ITS-90). NIST disseminates the
radiance temperature scale from 800 °C to 2700 °C
by issuing ribbon filament lamp standards of radiance temperature
and by calibrating customer supplied pyrometers and radiation thermometers.
- Spectral
Radiance and Irradiance Source Measurements
- Spectral radiometric measurements of radiance and irradiance standards
in the spectral region of 200 nm to 2400 nm are performed. Spectral
irradiance standards are supplied by NIST in two forms: tungsten filament lamps
and deuterium lamps. Special tests are available.
- Spectrophotometry
- Measurements of regular transmittance and specular or diffuse spectral
reflectance from 250 nm to 2500 nm on submitted text items.
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Inquiries or comments:
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Online: March 1996 - Last update: August 2003
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