基于光纤探头的洋葱近红外光谱检测的数值模拟
发布时间：2019-02-13 00:16
【摘要】：利用Monte Carlo方法模拟光在洋葱组织内部的传输特性,并结合采用光纤探头的接触式测量条件,对漫反射检测信号进行仿真计算,分析表皮厚度和光学性质对测量的影响。结果表明,表皮对信号强度有明显的衰减作用,但对平均穿透深度影响不大。在波长800nm处,探测点到入射点的距离(源探距)为0.9~2.0cm时,在保证信号强度的同时可达到0.5~0.8cm的平均穿透深度,并可检测到此深度的颈腐病害(Botrytis allii Munn.);使用直径和数值孔径较大的光纤探头可以在保证测量精度的同时提高探测灵敏度。
[Abstract]:The transmission characteristics of light in onion tissue were simulated by Monte Carlo method, and the influence of the thickness of epidermis and optical properties on the measurement was analyzed by using the contact measurement conditions of optical fiber probe. The results show that the epidermis can attenuate the signal intensity obviously, but has little effect on the average penetration depth. At wavelength 800nm, when the distance from the detection point to the incident point (source probe distance) is 0.9~2.0cm, the average penetration depth of 0.5~0.8cm can be achieved at the same time as the signal intensity is guaranteed, and the neck rot disease (Botrytis allii Munn.); can be detected at this depth. The optical fiber probe with large diameter and numerical aperture can improve the detection sensitivity while ensuring the measurement accuracy.
【作者单位】： 华中农业大学理学院;
【基金】：国家自然科学基金项目(61505063) 中央高校基本科研业务费专项(2662015BQ046)
【分类号】：S663.2;TN215
本文编号：2420955
[Abstract]:The transmission characteristics of light in onion tissue were simulated by Monte Carlo method, and the influence of the thickness of epidermis and optical properties on the measurement was analyzed by using the contact measurement conditions of optical fiber probe. The results show that the epidermis can attenuate the signal intensity obviously, but has little effect on the average penetration depth. At wavelength 800nm, when the distance from the detection point to the incident point (source probe distance) is 0.9~2.0cm, the average penetration depth of 0.5~0.8cm can be achieved at the same time as the signal intensity is guaranteed, and the neck rot disease (Botrytis allii Munn.); can be detected at this depth. The optical fiber probe with large diameter and numerical aperture can improve the detection sensitivity while ensuring the measurement accuracy.
【作者单位】： 华中农业大学理学院;
【基金】：国家自然科学基金项目(61505063) 中央高校基本科研业务费专项(2662015BQ046)
【分类号】：S663.2;TN215
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