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Method for improving terahertz band absorption spectrum measurement accuracy using noncontact sample thickness measurement |
Applied Optics, Vol. 51, Issue 20, pp. 4879-4884 (2012)
http://dx.doi.org/10.1364/AO.51.004879
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Abstract
The terahertz absorption spectrum has a complex nonlinear relationship with sample thickness, which is normally measured mechanically with limited accuracy. As a result, the terahertz absorption spectrum is usually determined incorrectly. In this paper, an iterative algorithm is proposed to accurately determine sample thickness. This algorithm is independent of the initial value used and results in convergent calculations. Precision in sample thickness can be improved up to 0.1 μm. A more precise absorption spectrum can then be extracted. By comparing the proposed method with the traditional method based on mechanical thickness measurements, quantitative analysis experiments on a three-component amino acid mixture shows that the global error decreased from 0.0338 to 0.0301.
© 2012 Optical Society of America
OCIS Codes
(120.4530) Instrumentation, measurement, and metrology : Optical constants
(300.1030) Spectroscopy : Absorption
(300.6495) Spectroscopy : Spectroscopy, teraherz
ToC Category:
Instrumentation, Measurement, and Metrology
History
Original Manuscript: April 10, 2012
Revised Manuscript: May 28, 2012
Manuscript Accepted: June 5, 2012
Published: July 9, 2012
Virtual Issues
Vol. 7, Iss. 9 Virtual Journal for Biomedical Optics
Citation
Zhi Li, Zhaohui Zhang, Xiaoyan Zhao, Haixia Su, Fang Yan, and Han Zhang, "Method for improving terahertz band absorption spectrum measurement accuracy using noncontact sample thickness measurement," Appl. Opt. 51, 4879-4884 (2012)
http://www.opticsinfobase.org/vjbo/abstract.cfm?URI=ao-51-20-4879
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