Simultaneous composition and thickness measurement of paper using terahertz time-domain spectroscopy

Journal Article · Fri Nov 20 00:00:00 EST 2009 · Applied Optics

DOI:https://doi.org/10.1364/AO.48.006541· OSTI ID:22036427

Mousavi, Payam; Haran, Frank; Jez, David; Santosa, Fadil; Dodge, John Steven

We present a noncontact method for quantitative composition and thickness monitoring of flat sheet products using terahertz time-domain spectroscopy. We apply the method to obtain simultaneous measurement of thickness and moisture content of paper sheets. The paper is modeled as an effective medium of water mixed with fibers, and model parameters are estimated from fits to the measured transmission amplitude. We demonstrate the method on two different paper samples and obtain uncertainties that are comparable with existing sensor technology. Monte Carlo simulations indicate that these uncertainties can be reduced further by at least an order of magnitude.

• OSTI ID: 22036427
• Journal Information: Applied Optics, Vol. 48, Issue 33; Other Information: (c) 2009 Optical Society of America; Country of input: International Atomic Energy Agency (IAEA); ISSN 0003-6935
• Country of Publication: United States
• Language: English

Related Subjects

46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY
ABSORPTION SPECTROSCOPY
AMPLITUDES
COMPUTERIZED SIMULATION
INFRARED SPECTRA
MONTE CARLO METHOD
THICKNESS
THZ RANGE
TRANSMISSION
WATER