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Applied Optics

Applied Optics


  • Vol. 44, Iss. 6 — Feb. 20, 2005
  • pp: 871–875

ACR II: Improved absolute cryogenic radiometer for low background infrared calibrations

Adriaan C. Carter, Steven R. Lorentz, Timothy M. Jung, and Raju U. Datla  »View Author Affiliations

Applied Optics, Vol. 44, Issue 6, pp. 871-875 (2005)

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A second-generation absolute cryogenic radiometer (ACR II) was developed for use at the Low Background Infrared calibration facility at the National Institute of Standards and Technology. The need for spectral calibrations of very sensitive [D* = 1014 cm (Hz)1/2W−1] infrared detectors necessitated the use of a cryogenic infrared monochromator and a more sensitive radiometer. The improved low-power performance of the ACR II compared with the older absolute cryogenic radiometer (ACR) has also made it useful as the primary standard for the calibration of cryogenic blackbody sources that are used as low-power infrared sources. The responsivity of the new radiometer’s receiver is 210 K/mW with a type A (random component) standard uncertainty of at most 7 pW when making power measurements of less than 10 nW. The original ACR has a responsivity of 29 K/mW and has a type A standard uncertainty of approximately 100 pW when making a similar low-noise-power measurement. Other properties of the radiometers are also described and compared.

© 2005 Optical Society of America

OCIS Codes
(040.3060) Detectors : Infrared
(040.3780) Detectors : Low light level
(120.3930) Instrumentation, measurement, and metrology : Metrological instrumentation
(120.3940) Instrumentation, measurement, and metrology : Metrology
(120.4800) Instrumentation, measurement, and metrology : Optical standards and testing
(120.5630) Instrumentation, measurement, and metrology : Radiometry

Original Manuscript: June 21, 2004
Revised Manuscript: October 13, 2004
Manuscript Accepted: October 14, 2004
Published: February 20, 2005

Adriaan C. Carter, Steven R. Lorentz, Timothy M. Jung, and Raju U. Datla, "ACR II: Improved absolute cryogenic radiometer for low background infrared calibrations," Appl. Opt. 44, 871-875 (2005)

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  5. The identification in this paper of particular commercial items does not imply endorsement by the National Institute of Standards and Technology.
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