牧草种子的太赫兹时域光谱测试中影响因素的探究

STUDY OF INFLUENCING FACTORS ON THZ-TIME DOMAIN SPECTROMETER TEST OF FORAGE SEEDS

本文选择肇东苜蓿草种为研究对象,测试分析了牧草种子在进行太赫兹时域光谱(THz-TDS)测试时的影响因素。具体地,量化研究确定了牧草种子制备时烘干去水的时间为8h。此外,在有效太赫兹频段(0～2THz)内的研究结果表明,牧草种子样品的颗粒大小对测试结果产生显著影响:粒径越小,样品的折射率也随之减小。同时,随着样品厚度的增加,透射光谱的强度也依次衰减。不仅如此,样品中不同质量比的聚乙烯不会影响样品的吸收系数,但是在测试的有效频段内对折射率的影响保持一定的规律性。这项研究不仅可以优化太赫兹实验测试,减少实验的偶然误差,提高测试的精度。更重要的是,为太赫兹牧草品种鉴定的批量测试奠定基础,为草种鉴别数据库建立提供准确的实验基础。

In this paper,the alfalfa forage seeds are selected as the research objects,and tested in a terahertz time-domain spectroscopy system to analyze the influencing factors.Specifically,quantitative experiment determines that the drying time for forage seeds is 8 hours.The results in the effective terahertz 0~2 THz band show that the grain size of the forage seed samples has a significant effect on the test results.The smaller the particle size,the smaller the refractive index of the sample.As the thickness of the sample increases,the intensity of the transmission spectrum also decays in turn.Not only that,the different mass ratios of polyethylene in the sample does not affect the absorption coefficient of the sample,but its effect onthe refractive index maintains certain regularity.This study can not only optimize the terahertz test,but also reduce the accidental error and improve the accuracy of the test.More importantly,it lays the foundation for batch testing of the forage seeds,and provides an accurate experimental basis for the establishment of grass species identification database.