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相关概念视频

Standing Waves in a Cavity01:28

Standing Waves in a Cavity

A household microwave and lasers are examples of standing electromagnetic waves in a cavity. When two conducting metal plates are placed parallel at the nodal planes, it creates a cavity where standing waves are formed. The cavity between the two planes is analogous to a stretched string held at the points x = 0 and x = L. Here, the distance 'L' between the two planes must be an integer multiple of half of the wavelength. The wavelengths that satisfy this condition are given by:

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相关实验视频

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Assembly, Tuning and Use of an Apertureless Near Field Infrared Microscope for Protein Imaging
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一个简单的微波成像系统用于通过基于对称的微波成像方法检查食品产品.

Gennaro Bellizzi1, Alessio Buzzin2, Lorenzo Crocco3

  • 1Department of Electrical Engineering and Information Technology, University of Naples Federico II, 80125 Naples, Italy.

Sensors (Basel, Switzerland)
|January 11, 2024
PubMed
概括

本研究介绍了一种具有成本效益的微波成像系统,用于非侵入性食品检查. 该系统有效地检测各种食品中的小异物,为线内质量控制提供了有希望的解决方案.

关键词:
对立方位的维瓦尔迪天线食品检查 食品检查 食品检查微波成像技术的微波成像这是一种非侵入性诊断.

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科学领域:

  • 食品科学与技术 食品科学与技术
  • 电磁学和应用物理学
  • 非侵入式传感技术的技术

背景情况:

  • 在食品工业中,对成本效益高,非侵入性直线检查方法的需求日益增长.
  • 需要能够检测食品中低密度异物体的技术.
  • 对各种食品的现有检查技术的局限性.

研究的目的:

  • 介绍一种简单的微波成像系统,用于各种食品的线内检查.
  • 为了证明系统在非侵入性检测小外体方面的能力.
  • 通过设计规格和模拟来验证系统的性能.

主要方法:

  • 开发一个微波成像系统,使用两个循环加载的反足Vivaldi天线.
  • 使用宽操作频段 (1-15 GHz) 来实现可适应的空间分辨率.
  • 实时微波成像策略的应用,利用食品对称性.

主要成果:

  • 微波成像系统的实验性表征.
  • 取得的结果与设计规格和数值模拟的有利比较.
  • 实验证明了该系统在检测污染物的有效性.

结论:

  • 开发的微波成像系统是有效的在线食品检查.
  • 该系统展示了在广泛的食品中检测低密度污染物的潜力.
  • 该技术为食品质量控制提供了一个可行的,具有成本效益的替代方案.