FAST DETERMINATION OF OPTICAL CONSTANTS AND SAMPLE THICKNESS OF THIN LIQUID SAMPLES IN TERAHERTZ TIME-DOMAIN SPECTROSCOPY
Abstract
The accuracy of the extracted optical constants by terahertz time domain spectroscopy critically depends on the accuracy of the sample thickness. However, due to the large number of optimization steps, it is time consuming to extract the optical constants over a broad frequency range and determine the sample thickness simultaneously using conventional algorithms. With particular emphasis on thin liquid samples, a three-dimensional optimization algorithm was used to obtain the optical constants and sample thickness simultaneously , significantly reducing the calculation time. In the experiments, the THz signals of 200-mm-thick water in a known cuvette were measured, and its accurate thickness and optical constants were determined by the algorithm, validating the effectiveness of the approach.
About the Authors
F. . Yang
Guizhou Institute of Metrology
Russian Federation
Russian Federation
L. -P. Liu
School of Pharmacy Engineering, Guizhou Institute of Technology
Russian Federation
Russian Federation
M. -J. Song
Guizhou Institute of Metrology
Russian Federation
Russian Federation
F. . Zhang
Guiyang Vocational and Technical College
Russian Federation
Russian Federation
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Review
For citations:
Yang F., Liu L.-., Song M.-., Zhang F. FAST DETERMINATION OF OPTICAL CONSTANTS AND SAMPLE THICKNESS OF THIN LIQUID SAMPLES IN TERAHERTZ TIME-DOMAIN SPECTROSCOPY. Zhurnal Prikladnoii Spektroskopii. 2018;85(5):790-795. (In Russ.)
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