Transmission measurements on intact apples moving at high speed
Transmission measurements on intact apples moving at high speed
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DOI：
10.1255/jnirs.406
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发表时间：
2004-01-01
影响因子：
1.8
通讯作者：
Martinsen, PJ
中科院分区：
文献类型：
--
作者：
McGlone, VA;Martinsen, PJ
两种不同的近红外光谱系统，都是基于现成的光学元件，进行了研究，直接传输模式测量完整的苹果（苹果Borkh。）以高速（500 mm s（-1））移动。一个系统是基于时间延迟积分光谱学（TDIS）的原理，其中从移动物体发出的光在移动通过光谱仪的视场时被电子跟踪。另一个系统，大孔径光谱仪（LAS），是一个更传统的设计，其中来自对象的光是积累在一系列的单次测量的水果通过视场的进展。每个系统都经过优化配置，使用相同的核心光学元件，以检测通过苹果漫透射的650至950 nm之间的低水平光。在干物质预测的背景下进行了性能比较，这是苹果质量的一个重要指标。LAS和TDIS系统干物质预测的建模和验证统计（R-2，RMSEP）分别为（0.87，0.43%）和（0.81，0.48%）。这些精度非常出色，与更常见但速度较慢的交互式近红外水果测量系统通常可实现的精度相似。因此，结果表明，使用直接传输模式是高速水果测量的可行选择，即使是像苹果这样非常不透明的水果。
Two different near infared spectrometric systems, both based on readily available optical components, were investigated for direct transmission mode measurements on intact apples (Malus domestica Borkh.) moving at high speed (500 mm s(-1)). One system was based on the principle of time-delayed integration spectroscopy (TDIS) in which light emanating from a moving object was electronically tracked as it moved through the field of view of the spectrometer. The other system, a large aperture spectrometer (LAS), was a more conventional design in which the light from the object is accumulated in a series of one-shot measurements as the fruit progresses through the field of view. The systems were each optimally configured, using the same core optic components, to detect the low levels of light diffusely transmitted through apples between 650 and 950 nm. Performance comparisons were made in the context of dry-matter predictions; an important metric for apple quality. Modelling and validation statistics (R-2, RMSEP) for dry-matter predictions were (0.87, 0.43%) and (0.81, 0.48%) for the LAS and TDIS systems, respectively. These accuracies are excellent and similar to what is normally achievable on the more common but slower interactance-type NIR fruit measurement systems. Hence, the results have demonstrated that use of a direct transmission mode is a viable option for high-speed fruit measurement, even for a very opaque fruit like apples.