Sensitive measurement of water content in dry material based on low-frequency terahertz time-domain spectroscopy

Takeshi Yasui; Tsutomu Araki

doi:10.1117/12.666812

9 December 2005 Sensitive measurement of water content in dry material based on low-frequency terahertz time-domain spectroscopy

Takeshi Yasui, Tsutomu Araki

Author Affiliations +

Proceedings Volume 6024, ICO20: Optical Devices and Instruments; 60240A (2005) https://doi.org/10.1117/12.666812
Event: ICO20:Optical Devices and Instruments, 2005, Changchun, China

Abstract

We proposed sensitive measurement of water content in dry material using low-frequency THz-TDS method. Simultaneous use of bowtie-type photoconductive antennas as a THz emitter and a THz detector achieves specific sensitivity in sub-THz region of ~0.3 THz, in which THz absorption of water is considerably decreased. Effectiveness of the proposed method is demonstrated through water content measurement in instant coffee powder in a glass bottle. The proposed system will be a powerful tool for extract quality control of water content in dry foods.

Citation Download Citation

Takeshi Yasui and Tsutomu Araki "Sensitive measurement of water content in dry material based on low-frequency terahertz time-domain spectroscopy", Proc. SPIE 6024, ICO20: Optical Devices and Instruments, 60240A (9 December 2005); https://doi.org/10.1117/12.666812

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