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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 16, Iss. 12 — Jun. 9, 2008
  • pp: 9060–9066

Diagnosing water content in paper by terahertz radiation

D. Banerjee, W. von Spiegel, M. D. Thomson, S. Schabel, and H. G. Roskos  »View Author Affiliations


Optics Express, Vol. 16, Issue 12, pp. 9060-9066 (2008)
http://dx.doi.org/10.1364/OE.16.009060


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Abstract

We explore the application of terahertz spectroscopic techniques for the remote determination of the water content of paper. The aim is the development of a rapid diagnostic imaging tool applicable in paper fabrication processes. THz radiation offers a high sensitivity for water, a good spatial resolution, and insensitivity to scattering at the paper surface. The advent of THz cameras makes fast large-area image detectors feasible. In this paper, we show for the case of a 0.6-THz fixed-frequency system, that the water content of paper can be determined with high accuracy. We demonstrate a quantitative (calibrated) method for determining the moisture content in paper based on extinction and phase measurements in the lower THz range with a spatial resolution in the mm-range and scanning times below two minutes.

© 2008 Optical Society of America

OCIS Codes
(120.0120) Instrumentation, measurement, and metrology : Instrumentation, measurement, and metrology
(120.7000) Instrumentation, measurement, and metrology : Transmission
(300.6495) Spectroscopy : Spectroscopy, teraherz
(110.6795) Imaging systems : Terahertz imaging

ToC Category:
Instrumentation, Measurement, and Metrology

History
Original Manuscript: March 13, 2008
Revised Manuscript: April 25, 2008
Manuscript Accepted: April 25, 2008
Published: June 4, 2008

Citation
D. Banerjee, W. von Spiegel, M. D. Thomson, S. Schabel, and H. G. Roskos, "Diagnosing water content in paper by terahertz radiation," Opt. Express 16, 9060-9066 (2008)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-16-12-9060


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References

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