A review of sensing techniques which could be used to generate images of agricultural and food materials

Bull, C.R.

doi:10.1016/0168-1699(93)90055-6

Cited by 13 publications

(4 citation statements)

References 36 publications

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“…The variation in reflectance from a material over a wavelength range due to the presence of different absorbing compounds can give an identifying signature that allows it to be distinguished from another material of similar colouration. This is a technique that has found a number of applications in the sorting and identifying of agricultural and food materials (Mohesenin, 1984;Bull, 1993;Bull et al, 1995). We show how observed differences in spectral reflection properties have been used to identify characteristic wavelengths which can be used to discriminate between lice and salmon skin.…”

Section: Introductionmentioning

confidence: 94%

Lepeophtheirus salmonis

2022

CABI Compendium

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Section: Introductionmentioning

confidence: 94%

Lepeophtheirus salmonis

2022

CABI Compendium

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“…Soil moisture plays a key role in the hydrological cycle by controlling processes, such as evapotranspiration, runoff, and recharge of aquifers, just to mention some of them [1][2][3]. Therefore, soil water content data are very useful for the application and evaluation of hydrological models that yield to irrigation programming and optimization [4].…”

Section: Introductionmentioning

confidence: 99%

Comparison between Capacitive and Microstructured Optical Fiber Soil Moisture Sensors

et al. 2018

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Soil moisture content has always been an important parameter to control because it is a deterministic factor for site-specific irrigation, seeding, transplanting, and compaction detection. In this work, a discrete sensor that is based on a SnO2–FP (Fabry-Pérot) cavity is presented and characterized in real soil conditions. As far as authors know, it is the first time that a microstructured optical fiber is used for real soil moisture measurements. Its performance is compared with a commercial capacitive soil moisture sensor in two different soil scenarios for two weeks. The optical sensor shows a great agreement with capacitive sensor’s response and gravimetric measurements, as well as a fast and reversible response; moreover, the interrogation technique allows for several sensors to be potentially multiplexed, which offers the possibility of local measurements instead of volumetric: it constitutes a great tool for real soil moisture monitoring.

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“…Various techniques have been tested and commercially exploited for the detection of FBs, including magnetic field systems (metal detectors) (17), optical techniques (2,11), X-ray systems (9,22,28), electrostatic techniques (9), microwave imaging (3,5), near-infrared imaging (12,20), UV and fluorescence imaging (2,24), nuclear magnetic resonance (19), and ultrasonic imaging (4,8,21,27). Of these techniques, only magnetic systems (metal detectors), optical systems, and X rays have widespread use (3,7,9).…”

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confidence: 99%

Detection of Foreign Bodies in Foods Using Continuous Wave Terahertz Imaging

Lee

Choi

Han

et al. 2012

Journal of Food Protection

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Foreign bodies (FBs) in food are health hazards and quality issues for many food manufacturers and enforcement authorities. In this study, continuous wave (CW) terahertz (THz) imaging at 0.2 THz with an output power of 10 mW was compared with X-ray imaging as techniques for inspection of food for FBs. High-density FBs, i.e., aluminum and granite pieces of various sizes, were embedded in a powdered instant noodle product and detected using THz and X-ray imaging. All aluminum and granite pieces (regular hexahedrons with an edge length of 1 to 5 mm) were visualized by both CW THz and X-ray imaging. THz imaging also detected maggots (length = 8 to 22 mm) and crickets (length = 35 and 50 mm), which were embedded in samples as low density FBs. However, not all sizes of maggot pieces embedded in powdered instant noodle were detected with X-ray imaging, although larger crickets (length = 50 mm and thickness = 10 mm) were detected. These results suggest that CW THz imaging has potential for detecting both high-density and low-density FBs embedded in food.

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A review of sensing techniques which could be used to generate images of agricultural and food materials

Cited by 13 publications

References 36 publications

Lepeophtheirus salmonis

Lepeophtheirus salmonis

Comparison between Capacitive and Microstructured Optical Fiber Soil Moisture Sensors

Detection of Foreign Bodies in Foods Using Continuous Wave Terahertz Imaging

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