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A portable device for detecting fruit quality by diffuse reflectance Vis/NIR spectroscopy

机译：通过漫反射可见/近红外光谱检测水果质量的便携式设备

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摘要

Soluble solid content (SSC) is a major quality parameter to fruit, which has influence on its flavor or texture. Some researches on the on-line non-invasion detection of fruit quality were published. However, consumers desire portable devices currently. This study aimed to develop a portable device for accurate, real-time and nondestructive determination of quality factors of fruit based on diffuse reflectance Vis/NIR spectroscopy (520-950 nm). The hardware of the device consisted of four units: light source unit, spectral acquisition unit, central processing unit, display unit. Halogen lamp was chosen as light source. When working, its hand-held probe was in contact with the surface of fruit samples thus forming dark environment to shield the interferential light outside. Diffuse reflectance light was collected and measured by spectrometer (USB4000). ARM (Advanced RISC Machines), as central processing unit, controlled all parts in device and analyzed spectral data. Liquid Crystal Display (LCD) touch screen was used to interface with users. To validate its reliability and stability, 63 apples were tested in experiment, 47 of which were chosen as calibration set, while others as prediction set. Their SSC reference values were measured by refractometer. At the same time, samples' spectral data acquired by portable device were processed by standard normalized variables (SNV) and Savitzky-Golay filter (S-G) to eliminate the spectra noise. Then partial least squares regression (PLSR) was applied to build prediction models, and the best predictions results was achieved with correlation coefficient (r) of 0.855 and standard error of 0.6033' Brix. The results demonstrated that this device was feasible to quantitatively analyze soluble solid content of apple.
机译：可溶性固形物（SSC）是水果的主要质量参数，它影响其味道或质地。公开了对果实品质在线非入侵检测的一些研究。然而，消费者当前需要便携式设备。这项研究旨在开发一种便携式设备，用于基于漫反射可见光/近红外光谱（520-950 nm）准确，实时且无损地确定水果的品质因子。该设备的硬件包括四个单元：光源单元，光谱采集单元，中央处理单元，显示单元。选择卤素灯作为光源。工作时，其手持式探头与水果样品的表面接触，从而形成了黑暗的环境，以屏蔽外界的干扰光。收集漫反射光并通过光谱仪（USB4000）测量。 ARM（高级RISC机器）作为中央处理单元，控制设备中的所有零件并分析光谱数据。液晶显示（LCD）触摸屏用于与用户进行交互。为了验证其可靠性和稳定性，在实验中测试了63个苹果，其中47个被选作校准集，其他被选为预测集。它们的SSC参考值通过折光仪测量。同时，通过标准归一化变量（SNV）和Savitzky-Golay滤波器（S-G）处理便携式设备采集的样品光谱数据，以消除光谱噪声。然后应用偏最小二乘回归（PLSR）建立预测模型，并以0.855的相关系数（r）和0.6033'Brix的标准误获得最佳的预测结果。结果表明该装置可用于定量分析苹果中可溶性固形物。

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  • 来源
  • 会议地点 Anaheim(US)
  • 作者

    Hongwei Sun; Yankun Peng; Peng Li; Wenxiu Wang;

  • 作者单位

    College of Engineering, National RD Center for Agro-processing Equipment, China Agricultural University, 17 Qinghua East Road, Haidian, Beijing 100083, China;

    College of Engineering, National RD Center for Agro-processing Equipment, China Agricultural University, 17 Qinghua East Road, Haidian, Beijing 100083, China;

    College of Engineering, National RD Center for Agro-processing Equipment, China Agricultural University, 17 Qinghua East Road, Haidian, Beijing 100083, China;

    College of Engineering, National RD Center for Agro-processing Equipment, China Agricultural University, 17 Qinghua East Road, Haidian, Beijing 100083, China;

  • 会议组织
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    diffuse reflectance spectroscopy; apple; soluble solid content; portable device;

    机译：漫反射光谱苹果;可溶性固形物；便携式设备;

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