Terahertz time-domain spectroscopy and application on peanut oils

Jiusheng Li; Jianquan Yao; Jianrui Li

doi:10.1117/12.819782

16 February 2009 Terahertz time-domain spectroscopy and application on peanut oils

Jiusheng Li, Jianquan Yao, Jianrui Li

Proceedings Volume 7277, Photonics and Optoelectronics Meetings (POEM) 2008: Terahertz Science and Technology; 727705 (2009) https://doi.org/10.1117/12.819782
Event: Photonics and Optoelectronics Meetings, 2008, Wuhan, China

Abstract

Many materials were previously studied using far-infrared Fourier transform spectroscopy (FTS) in transmission and reflection modes. Recently, there has been a remarkable effort in employing terahertz time-domain spectroscopy (THz-TDS) for investigating material properties, including environment pollutants, semiconductors, polymers, explosive materials, and gases, etc. Since the absorption coefficient and the refractive index of the material studied are directly related to the amplitude and phase respectively of the transmitted field, both parts of the complex permittivity can be obtained by THz-TDS. In this letter, the optical properties of peanut oils in the frequency range from 0.2 to 2.5 THz were studied by employing terahertz time-domain spectroscopy. Several peanut oils, such as clean unused peanut oil, peanut oil after five minutes of boiling, and peanut oil after ten minutes of boiling were tested. The time delays of clean unused peanut oil, peanut oil after five minutes of boiling, and peanut oil after ten minutes of boiling are 8.33ps, 8.46ps and 8.46ps, respectively. The refractive indices of the three oil samples show slow a decrease as the terahertz wave frequency increases. The power absorption coefficients increase as the frequency increases within the investigated terahertz wave frequency range.

Citation Download Citation

Jiusheng Li, Jianquan Yao, and Jianrui Li "Terahertz time-domain spectroscopy and application on peanut oils", Proc. SPIE 7277, Photonics and Optoelectronics Meetings (POEM) 2008: Terahertz Science and Technology, 727705 (16 February 2009); https://doi.org/10.1117/12.819782

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