硫熏中药材快速检测装置设计研究

发布时间：2018-02-25 10:10

本文关键词： 硫磺熏蒸中药材微型光谱仪便携现场检测　出处：《河北大学》2016年硕士论文　论文类型：学位论文

【摘要】：目前硫磺熏蒸中药材的加工处理方法仍然屡禁不止,市售个别中药材存在硫磺残留量超标的现象,但应用在现场测试的便携式硫熏中药材快速检测仪器鲜有报道。本文基于可见-近红外光谱技术研制了一种便携式硫熏中药材快速检测装置。首先验证了本课题组前期工作得出的硫熏中药材在715 nm和835 nm有特征吸收峰存在。通过PLASUS SPELINE软件辨识硫元素特征吸收峰谱线波长,发现716 nm及839nm也可认定为特征吸收谱线,样品浸出液制备时间也由2 h缩短为45 min。在前期搭建的测试平台基础上,完成了优化方案的设计。方案对装置的光源及恒流驱动电路、供电电源等进行了优化设计,构成了一台完整的测试装置。主要工作体现在:通过设置光路汇聚透镜,提高了卤钨灯光源的利用率,使卤钨灯的功率由原来35 W降低至20 W,延长了锂电池组的续航工作时间;设置了比色皿进光口光阑,降低了杂散光干扰;电源部分通过增加DC/DC转换模块,使得电池端电压在大范围变化时仍能保持供电电压的恒定,提高了电池组电能的利用率。设计研制了50 mA~1.6 A可调式恒流驱动电源,其负载和电压调整率均优于0.1%。完成了装置的机箱的设计,最终研制出了一台完整的测试装置样机。同时本文还初步讨论了选取LED作为装置光源的可行性,实际测试验证了峰值波长为700 nm,半峰宽波长范围为680 nm~720 nm的LED光源可以用于硫熏中药材715 nm处吸收峰的判断。对研制的硫熏中药材快速检测装置进行了实际测试,共测试了10个中药材样品,检测结果显示其中5个为硫熏样品,1个为未硫熏样品,4个样品特征不明显。测试结果表明,该装置可以用于硫熏中药材现场初筛检测。
[Abstract]:At present, the processing and treatment methods of sulfur fumigation of Chinese medicinal materials are still not prohibited. Some Chinese medicinal materials sold on the market have the phenomenon of sulphur residue exceeding the standard. However, there are few reports on portable apparatus for rapid detection of sulfur fumigated Chinese medicinal materials. Based on visible and near infrared spectroscopy, a portable apparatus for rapid detection of sulfur fumigated Chinese medicinal materials has been developed in this paper. Firstly, the subject of this paper has been verified. There were characteristic absorption peaks at 715 nm and 835 nm in the Chinese medicinal herbs obtained from the preliminary work of the group. The wavelength of the characteristic absorption peaks of sulfur elements was identified by PLASUS SPELINE software. It is found that 716 nm and 839 nm can also be identified as characteristic absorption lines, and the preparation time of the sample leaching solution is shortened from 2 h to 45 min. On the basis of the test platform built in the previous period, the design of the optimized scheme has been completed. The light source and the constant current drive circuit of the device have been designed by the scheme. The power supply has been optimized and a complete testing device has been constructed. The main work is to improve the utilization ratio of halogen tungsten lamp light source by setting the light path convergent lens. The power of halogen tungsten lamp is reduced from 35W to 20W, and the working time of lithium battery pack is prolonged. The battery terminal voltage can keep constant supply voltage when it changes in a wide range, and the utilization ratio of battery pack energy is improved. A 50 mA~1.6 A adjustable constant current drive power supply is designed and developed. The load and voltage adjustment rate are better than 0.1. The design of the chassis of the device is completed, and a complete prototype of the test device is developed. At the same time, the feasibility of selecting LED as the light source of the device is discussed preliminarily. The LED light source with a peak wavelength of 700nm and a half peak wavelength of 680nm can be used to judge the absorption peak at 715nm of sulfur fumigated Chinese medicinal materials. A total of 10 samples of Chinese medicinal materials were tested. The results showed that 5 samples were sulfur fumigation samples, 1 sample was not sulfur smoked samples, and 4 samples had not obvious characteristics. The test results showed that the device could be used for the primary screening detection of sulfur fumigating Chinese medicinal materials in the field.
【学位授予单位】：河北大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：TH77;R284.1

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