From Visual Spectrum to Millimeter Wave: A Broad Spectrum of Solutions for Food Inspection

Becker, Florian; Schwabig, Christopher; Krause, Julius; Leuchs, Sven; Krebs, Christian; Gruna, Robin; Kuter, Andries; Längle, Thomas; Nuessler, Dirk; Beyerer, Jürgen

doi:10.1109/map.2020.3003225

Cited by 14 publications

(10 citation statements)

References 26 publications

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“…In the first experiment, as a low-contrast layered medium, one PTFE Teflon sphere (radius 1.5 cm) is placed inside the foam with the center position of (0 cm, −0.7 cm, 0 cm). In this case, we employ only the transmission part of the Green's function (G (10) ≈ G (10) T ) for image reconstruction. Furthermore, since the measurement response from the background media is known, we can suppress it from the total response using a background subtraction procedure.…”

Section: Resultsmentioning

confidence: 99%

“…As mentioned earlier, Green's function is composed of two parts that are transmission and reflection. Since the contrast between the layers is no longer negligible, both transmitted and reflected components of the EM field are considered in modeling of Green's function, i.e., G (10) = G (10) T + G (10) R . Figure 7 represents the comparison between the analytical model of Green's function and FEM.…”

Section: High-contrast Mediamentioning

confidence: 99%

“…First and second dominant eigenvalues are employed to focus on the first and second targets, respectively. Reconstruction images with updated G (10) are depicted in Figure 8. The reconstructed images show that the two wet spots are properly detected.…”

Section: High-contrast Mediamentioning

confidence: 99%

“…The power level and pulse duration of the magnetrons will be adjusted based on the input information from MWT. Some applications of the MWT in industry for inspection, monitoring purposes, quality control of the goods, and safety issues are listed in [8][9][10]. Designing and integrating an MWT system into an industrial microwave drying system is a challenging task.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

An Electromagnetic Time-Reversal Imaging Algorithm for Moisture Detection in Polymer Foam in an Industrial Microwave Drying System

Omrani

Yadav

Link

et al. 2021

Sensors

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Microwave tomography (MWT) based control is a novel idea in industrial heating systems for drying polymer foam. In this work, an X-band MWT module is designed and developed using a fixed antenna array configuration and integrated with the HEPHAISTOS industrial heating system. A decomposition of the time-reversal operator (DORT) algorithm with a proper Green’s function of multilayered media is utilized to localize the moisture location. The derived Green’s function can be applied to the media with low or high contrast layers. It is shown that the time-reversal imaging (TRI) with the proposed Green’s function can be applied to the multilayered media with a moderately rough surface. Moreover, a single frequency TRI is proposed to decrease the measurement time. Numerical results for different moisture scenarios are presented to demonstrate the efficacy of the proposed method. The developed method is then tested on the experimental data for different moisture scenarios from our developed MWT experimental prototype. Image reconstruction results show promising capabilities of the TRI algorithm in estimating the moisture location in the polymer foam.

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Section: Resultsmentioning

confidence: 99%

Section: High-contrast Mediamentioning

confidence: 99%

Section: High-contrast Mediamentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

An Electromagnetic Time-Reversal Imaging Algorithm for Moisture Detection in Polymer Foam in an Industrial Microwave Drying System

Omrani

Yadav

Link

et al. 2021

Sensors

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“…Microwave sensing and imaging methods for application in multi-phase flow monitoring and metering in the oil and gas industry are given in [ 29 , 30 ]. In the food industry, MWT has been widely applied for inspection and quality control [ 31 , 32 , 33 ]. Sensing of low permittivity materials, such as gaseous substances or foam with high air content, with MWT is reported in [ 34 ].…”

Section: Related Workmentioning

confidence: 99%

Supporting Visualization Analysis in Industrial Process Tomography by Using Augmented Reality—A Case Study of an Industrial Microwave Drying System

Zhang

Omrani

Yadav

et al. 2021

Sensors

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Industrial process tomography (IPT) based process control is an advisable approach in industrial heating processes for improving system efficiency and quality. When using it, appropriate dataflow pipelines and visualizations are key for domain users to implement precise data acquisition and analysis. In this article, we propose a complete data processing and visualizing workflow regarding a specific case—microwave tomography (MWT) controlled industrial microwave drying system. Furthermore, we present the up-to-date augmented reality (AR) technique to support the corresponding data visualization and on-site analysis. As a pioneering study of using AR to benefit IPT systems, the proposed AR module provides straightforward and comprehensible visualizations pertaining to the process data to the related users. Inside the dataflow of the case, a time reversal imaging algorithm, a post-imaging segmentation, and a volumetric visualization module are included. For the time reversal algorithm, we exhaustively introduce each step for MWT image reconstruction and then present the simulated results. For the post-imaging segmentation, an automatic tomographic segmentation algorithm is utilized to reveal the significant information contained in the reconstructed images. For volumetric visualization, the 3D generated information is displayed. Finally, the proposed AR system is integrated with the on-going process data, including reconstructed, segmented, and volumetric images, which are used for facilitating interactive on-site data analysis for domain users. The central part of the AR system is implemented by a mobile app that is currently supported on iOS/Android platforms.

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Compact hand-guided 3D scanning terahertz sensor platforms with 3D-printed aspherical telecentric f-θ lens

Mohammadzadeh

Hussung

Keil

et al. 2023

Int. J. Microw. Wireless Technol.

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We report on the development of a handheld three-dimensional (3D) terahertz scanning system with an aspherical telecentric 3D-printed f-θ lens using selective laser sintering. The lens covers a broader scan line of 50 mm with its larger aperture, compared to the 20 mm range in our initial work, which was presented at the European Microwave Week 2021. In order to evaluate the adaptability of the optomechanical components with different sensor units, two different integrated frequency-modulated continuous wave radar modules based on monolithic microwave integrated circuit technology, operating in W- and D-bands are tested within the measurement scheme. The optomechanical part consists of a galvanometer scanner mirror and the f-θ lens. The optical system enables B-scans perpendicular to the manual translational movement of the sensor unit by its user. An integrated guiding wheel system with rotary encoder makes it possible to correlate the measurement points to their respective locations, enabling complete 3D volumetric inspection of the corresponding structures, which is particularly useful for the inspection along cracks and welds.

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From Visual Spectrum to Millimeter Wave: A Broad Spectrum of Solutions for Food Inspection

Cited by 14 publications

References 26 publications

An Electromagnetic Time-Reversal Imaging Algorithm for Moisture Detection in Polymer Foam in an Industrial Microwave Drying System

An Electromagnetic Time-Reversal Imaging Algorithm for Moisture Detection in Polymer Foam in an Industrial Microwave Drying System

Supporting Visualization Analysis in Industrial Process Tomography by Using Augmented Reality—A Case Study of an Industrial Microwave Drying System

Compact hand-guided 3D scanning terahertz sensor platforms with 3D-printed aspherical telecentric f-θ lens

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