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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Editor: James C. Wyant
  • Vol. 47, Iss. 30 — Oct. 20, 2008
  • pp: 5604–5615

Aqueous blackbody calibration source for millimeter-wave/terahertz metrology

Charles Dietlein, Zoya Popović, and Erich N. Grossman  »View Author Affiliations


Applied Optics, Vol. 47, Issue 30, pp. 5604-5615 (2008)
http://dx.doi.org/10.1364/AO.47.005604


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Abstract

This paper describes a calibrated broadband emitter for the millimeter-wave through terahertz frequency regime, called the aqueous blackbody calibration source. Due to its extremely high absorption, liquid water is chosen as the emitter on the basis of reciprocity. The water is constrained to a specific shape (an optical trap geometry) in an expanded polystyrene (EPS) container and maintained at a selected, uniform temperature. Uncertainty in the selected radiometric temperature due to the undesirable reflectance present at a water interface is minimized by the trap geometry, ensuring that radiation incident on the entrance aperture encounters a pair of s and a pair of p reflections at 45 ° . For water reflectance R w of 40% at 45 ° in the the W-band, this implies a theoretical effective aperture emissivity of ( 1 R w s 2 R w p 2 ) > 98.8 % . From the the W-band to 450 GHz , the maximum radiometric temperature uncertainty is ± 0.40 K , independent of water temperature. Uncertainty from 450 GHz to 1 THz is increased due to EPS scattering and absorption, resulting in a maximum uncertainty of 3 K at 1 THz .

OCIS Codes
(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

ToC Category:
Instrumentation, Measurement, and Metrology

History
Original Manuscript: May 16, 2008
Manuscript Accepted: June 25, 2008
Published: October 15, 2008

Citation
Charles Dietlein, Zoya Popović, and Erich N. Grossman, "Aqueous blackbody calibration source for millimeter-wave/terahertz metrology," Appl. Opt. 47, 5604-5615 (2008)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-47-30-5604

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