Diagnosing water content in paper by terahertz radiation

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 reso...

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Bibliographic Details
Published in:	Optics express Vol. 16; no. 12; pp. 9060 - 9066
Main Authors:	Banerjee, D, von Spiegel, W, Thomson, M D, Schabel, S, Roskos, H G
Format:	Journal Article
Language:	English
Published:	United States 09-06-2008
Subjects:	Algorithms Infrared Rays Materials Testing - methods Microwaves Reproducibility of Results Sensitivity and Specificity Spectrum Analysis - methods Water - analysis Water - chemistry
Online Access:	Get full text
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Summary:	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.
Bibliography:	ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23
ISSN:	1094-4087 1094-4087
DOI:	10.1364/OE.16.009060