Online fruit weighing using a 500 MHz waveguide cavity

Waal, A. de; Mercer, Susan; Downing, B.J.

doi:10.1049/el:19880142

Cited by 5 publications

(3 citation statements)

References 5 publications

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“…De Waal et al (1988) used microwave technology for on-line weight estimation of apples and oranges. Their approach was based on the effect of fruit water content on the resonant frequency of a resonant waveguide cavity.…”

Section: Other Techniquesmentioning

confidence: 99%

See 1 more Smart Citation

Non-destructive technologies for fruit and vegetable size determination – A review

Moreda

Ortiz-Cañavate

García-Ramos

et al. 2009

Journal of Food Engineering

138

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Here, we review different methods for non-destructive horticultural produce size determination, focusing on electronic technologies capable of measuring fruit volume.The usefulness of produce size estimation is justified and a comprehensive classification system of the existing electronic techniques to determine dimensional size is proposed.The different systems identified are compared in terms of their versatility, precision and throughput. There is general agreement in considering that online measurement of axes, perimeter and projected area has now been achieved. Nevertheless, rapid and accurate volume determination of irregular-shaped produce, as needed for density sorting, has only become available in the past few years. An important application of density measurement is soluble solids content (SSC) sorting. If the range of SSC in the batch is narrow and a large number of classes are desired, accurate volume determination becomes important. A good alternative for fruit three-dimensional surface reconstruction, from which volume and surface area can be computed, is the combination of height profiles from a range sensor with a two-dimensional object image boundary from a solid-state camera (brightness image) or from the range sensor itself (intensity image). However, one of the most promising technologies in this field is 3-D multispectral scanning, which combines multispectral data with 3-D surface reconstruction.

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Section: Other Techniquesmentioning

confidence: 99%

“…The waveguide cavity concept reported by De Waal et al (1988) is likely to have been associated with some technical or cost problems because there have been no additional reports on this system. Although interesting, the artificial retina machine-vision system of Kanali et al (1998) has the disadvantage of being a desktop system.…”

Section: Tablementioning

confidence: 99%

Non-destructive technologies for fruit and vegetable size determination – A review

Moreda

Ortiz-Cañavate

García-Ramos

et al. 2009

Journal of Food Engineering

138

View full text Add to dashboard Cite

show abstract

“…The vision sensors are used for tracking and identifying an object moving on a conveyor belt [2][3][4], and range sensors are used for volume measurement [5]. The automatic weighing and sorting system is used in food and pharmaceutical industry where continuous and precise mass measurement of small objects is required [6,7]. The belt conveyor is used for automatic weighing to continuously feed products under measurement [8][9][10][11][12].…”

Section: Introductionmentioning

confidence: 99%

Noise in Load Cell Signal in an Automatic Weighing System Based on a Belt Conveyor

Choi

2017

Journal of Sensors

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Noise in load cell signal in an automatic weighing system based on a belt conveyor has been examined experimentally in time and frequency domains to enhance signal quality. The noise frequency spectrum showed nonlinearly increasing multiple resonance peaks as speed increased. The noise reduction process using noise reduction algorithm, by sharply rejecting peak noise frequency component and afterward forming optimum pulse width ratio through filter slope control using selective switching of 6 LPF stages, was used for enhanced accuracy. The effectiveness of proposed method, controlling both cutoff frequency and slope of LPF, was evaluated by feeding 50 g test mass, and this noise reduction process showed better noise filtering with enhanced accuracy than fixed cutoff frequency control method. The ratio of top to bottom pulse width showed that LPF cutoff frequency above 5 Hz had the ratio above 50% up to 80 m/min speed range.

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Estimation of oxygen uptake rate of tomato (Lycopersicon esculentum Mill.) fruits by artificial neural networks modelled using near-infrared spectral absorbance and fruit mass

et al. 2010

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Online fruit weighing using a 500 MHz waveguide cavity

Cited by 5 publications

References 5 publications

Non-destructive technologies for fruit and vegetable size determination – A review

Non-destructive technologies for fruit and vegetable size determination – A review

Noise in Load Cell Signal in an Automatic Weighing System Based on a Belt Conveyor

Estimation of oxygen uptake rate of tomato (Lycopersicon esculentum Mill.) fruits by artificial neural networks modelled using near-infrared spectral absorbance and fruit mass

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