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 2008-06, Vol.16 (12), p.9060-9066
Main Authors: Banerjee, D, von Spiegel, W, Thomson, M D, Schabel, S, Roskos, H G
Format: Article
Language:English
Subjects:
Algorithms
Infrared Rays
Materials Testing - methods
Microwaves
Reproducibility of Results
Sensitivity and Specificity
Spectrum Analysis - methods
Water - analysis
Water - chemistry
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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.
ISSN:1094-4087
1094-4087
DOI:10.1364/OE.16.009060