Quantitative measurement of AMS and orange mixtures by terahertz time-domain spectroscopy

Qiang Wang; Yehao Ma; Xiaowei Wang

doi:10.1117/12.924299

9 May 2012 Quantitative measurement of AMS and orange mixtures by terahertz time-domain spectroscopy

Qiang Wang, Yehao Ma, Xiaowei Wang

Proceedings Volume 8366, Advanced Environmental, Chemical, and Biological Sensing Technologies IX; 83660U (2012) https://doi.org/10.1117/12.924299
Event: SPIE Defense, Security, and Sensing, 2012, Baltimore, Maryland, United States

Abstract

Terahertz time domain spectroscopy (THz-TDS) is a new kind of nondestructive detection method, frequency of terahertz wave spans from a few tens of GHz to several THz, which is used to detect material because of its strong identification, it can supply rich vibration information caused by intermolecular and large intra-molecular. Ammonium sulfamate (AMS) is a kind of herbicide, it has special value for many woody plants, which can prevent annual weeds. The excess use of pesticide is a huge threaten for human health in recent years, thus the research on detection of pesticide has absolutely important meaning, in this paper, pure AMS and mixture samples of AMS and orange are measured using THz-TDS, and their absorption coefficient are calculated by the model, which is put forward based on Fresnel equation. We qualitatively analyze the absorption coefficient spectra of pure AMS, which is useful for us to identify the pesticide in agriculture products. Meanwhile, we measured 14 mixture samples of AMS and orange, the weight ratio of mixtures are from 0% to 59.9%. Nine samples are considered as calibration set and the other five samples are regarded as prediction set, to quantitatively analyze the concentration of AMS by the partial least squares (PLS), the result shows that the prediction error is less then 4.5%, in addition, the relationship of the average absorption and weight ratio are absolutely linear. The experiment demonstrates that THz-TDS is promising and efficient to quantitatively detect the component of mixtures, and it has important reference value for the detection of pesticide in agriculture food.

Citation Download Citation

Qiang Wang, Yehao Ma, and Xiaowei Wang "Quantitative measurement of AMS and orange mixtures by terahertz time-domain spectroscopy", Proc. SPIE 8366, Advanced Environmental, Chemical, and Biological Sensing Technologies IX, 83660U (9 May 2012); https://doi.org/10.1117/12.924299

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