Novel T-ray Liquid Spectroscopy via Double Modulated Differential Time-Domain Spectroscopy

Liquid water absorption is one of the most enduring problems facing THz imaging and spectroscopy in biomedical applications. The absorption coefficient for liquid water shows a very high THz absorption, 200 cm -1 at 1 THz (Mickan et al., 2004). This strong absorption is a big hurdle for T-ray spectr...

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Bibliographic Details
Main Authors: Balakrishnan, J., Fischer, B., Mickan, S.P., Abbott, D.
Format: Conference Proceeding
Language:English
Subjects:
Absorption
Biomedical imaging
Fluctuations
Laser noise
Liquids
Pollution measurement
Spectroscopy
Spinning
Time domain analysis
Wheels
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Summary:Liquid water absorption is one of the most enduring problems facing THz imaging and spectroscopy in biomedical applications. The absorption coefficient for liquid water shows a very high THz absorption, 200 cm -1 at 1 THz (Mickan et al., 2004). This strong absorption is a big hurdle for T-ray spectroscopy and imaging of liquid or even wet samples (Zhang, 2002). This paper proposes a novel method for parameter extraction of a liquid, using a double modulated differential time-domain spectroscopy (DTDS) technique with dual-thickness measurement. The proposed technique improves on the previous work by replacing the required sample dithering technique (Mickan et al., 2004) with a rotating spinning wheel resulting in an improved noise performance up to two orders of magnitude.
ISSN:2162-2027
DOI:10.1109/ICIMW.2006.368654