About Optical Calibration Standards
Optical calibration standards are used to calibrate the optical properties of optical detectors and optical instruments. Photometric and radiometric light measurement applications use optical calibration standards for values such as illuminance or irradiance, luminance or radiance, luminous flux or radiant power, and luminous intensity or radiant intensity. Examples of optical calibration standards include light sources and lamps, light detectors, and reflectance plates. In the United States, certification laboratories such as the National Institute of Standards and Technology (NIST) define the primary optical calibration standards. Transfer standards are used to compare or transfer these primary values to secondary calibration facilities. Reference standards or working standards are then used to calibrate, test, and inspect optical components and instruments.
There are many different types of optical calibration standards. Categories include lamp calibration standards, spectroscopy standards, and photometer standards. There are two basic types of lamp calibration standards: calibrated irradiance sources and spectral calibration lamps. Calibrated irradiance sources are used to irradiate a sample with a known power density. Spectral calibration lamps produce narrow spectral lines and are used to calibrate monochromators, spectrographs, spectral radiometers, and other optical instruments. There are many types of spectroscopy standards. Examples include mass spectroscopy standards, alpha spectroscopy standards, and X-ray spectroscopy standards. Atomic absorption spectroscopy standards are available for elements such as aluminum, barium and cobalt in various sources (matrices) and sizes.
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Engineering Web: Optical Calibration Standards
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Agilent | United States Home Reagents, Standards & Kits Cloning & Competent Cells Instrument Standards & Kits Mutagenesis See Agilent Technologies, Inc. / Electronic Measurement Group Information |
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Thermometry home page Research, calibration services, and national standards in the field of radiation thermometry are the responsibility of a separate group at NIST: the |
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NIST: Time and Frequency Division - Division 847 Standards The division develops and maintains the primary standards for frequency and time interval in the United States. |
