Measuring Dielectric Properties for Sensing Foreign Material in Peanuts

Julrat, Sakol; Trabelsi, Samir

doi:10.1109/jsen.2018.2882367

Cited by 14 publications

(9 citation statements)

References 15 publications

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“…The microwave attenuation of corn is greater than that of rice under similar moisture content. The attenuation A for different samples can be calculated by substituting |E C | maxs into equation (9). When the sample container is empty, |E C | maxe is 2869.2 mv.…”

Section: Attenuation Of the Traveling-standing Microwavementioning

confidence: 99%

“…By substituting equations (9) and (11) into equation (12), the following expression is obtained for c:…”

Section: Ricementioning

confidence: 99%

“…Microwave free-space techniques are known for their safe, non-destructive, and non-contact processes and their lack of special sample preparation requirements. 9 The development of miniaturization and low cost of microwave devices makes microwave moisture content measurement more competitive in industry and agriculture. [10][11][12] At microwave frequencies, water molecules have strong polarization characteristics under the action of external electric field.…”

Section: Introductionmentioning

confidence: 99%

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Free space traveling–standing wave attenuation method for microwave sensing of grain moisture content

Chen

et al. 2020

Measurement and Control

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Moisture content is an important index to assess the grain quality and food processing conditions. A measurement system based on the traveling–standing microwave attenuation method is designed for a fast and nondestructive grain moisture content determination. The proposed system consists of a microwave cavity oscillator, microwave transmitting and receiving horn antennas, microwave detector, slide rail, sample container, weight sensor, temperature sensor, and controller. The traveling–standing wave caused by free space microwave multiple reflection is discussed. The moisture content calibration functions eliminated the interference of bulk density and temperature are proposed based on the attenuation of the maximum field strength of the transmission traveling–standing wave. The moisture content of rice, which ranges from 10.75% to 27.62%, is obtained with a standard error of prediction (SEP) of 0.586% and a coefficient of determination ( R2) of 0.988, whereas the moisture content of corn, which ranges from 7.72% to 24.46%, is obtained with a SEP of 0.340% and R2 of 0.991. The main results might provide technical support for the development of accurate and intelligent grain quality detection equipment.

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Section: Attenuation Of the Traveling-standing Microwavementioning

confidence: 99%

“…By substituting equations (9) and (11) into equation (12), the following expression is obtained for c:…”

Section: Ricementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Free space traveling–standing wave attenuation method for microwave sensing of grain moisture content

Chen

et al. 2020

Measurement and Control

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“…The model has been proven effective for the moisture determination of wheat, corn, soybeans, and peanuts (with a standard error of less than 0.97%) [1]. In particular, a shelled peanut moisture determination device was developed by using free-space method (the standard error less than 0.55%), and successfully applied it in the peanut drying field [18,19,20,21]. The free space method can be used to calculate the complex permittivity of grain by measuring the attenuation and phase change of the microwave propagated through the grain.…”

Section: Introductionmentioning

confidence: 99%

“…To prevent the diffraction at the edges of the sample holder and the multiple reflections in the sample holder, the size of the cross-section and the thickness of the sampler holder must be large enough. The sizes of the sample holder in their studies [20,21] were 22.2 cm × 13.3 cm × 21.9 cm (4.5 L) and 4.4 cm × 4.4 cm × 12 cm (243 mL), respectively. This makes the measuring device bulky and difficult to carry, limiting its scope of application.…”

Section: Introductionmentioning

confidence: 99%

A Novel, Portable and Fast Moisture Content Measuring Method for Grains Based on an Ultra-Wideband (UWB) Radar Module and the Mode Matching Method

Zhang

Shi

Yang

et al. 2019

Sensors

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To perform fast and portable grain moisture measurements under field conditions, a novel moisture sensor was designed, which consisted of a coaxial waveguide, a circular waveguide, and an isolation layer. The electromagnetic characteristics of the sensor were simulated and measured. The analytical model, which represented the relationship between the reflection coefficient of the sensor and the complex permittivity of grain, was established by using the mode matching method. The reflection coefficient of the sensor was measured by using an ultra-wideband (UWB) radar module, and the moisture content of grains was calculated from the complex permittivity by using density-independent model. To verify the performance of the proposed method, wheat, rough rice, and barley were taken as examples. The measured results in the range from 1.0% to 26.0%, wet basis, agreed well with the reference values (R2 was more than 0.99), and the maximum absolute errors for wheat, rough rice, and barley were 1.1%, 1.0%, and 1.4%, respectively. In addition, the effect of isolation layer was discussed. Both the simulation results and the experimental results showed that the isolation layer improved the stability of sensor.

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Use of dielectric mixture equations for the characterization of uncleaned peanuts

Julrat

Trabelsi

2022

Measurement: Food

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Measuring Dielectric Properties for Sensing Foreign Material in Peanuts

Cited by 14 publications

References 15 publications

Free space traveling–standing wave attenuation method for microwave sensing of grain moisture content

Free space traveling–standing wave attenuation method for microwave sensing of grain moisture content

A Novel, Portable and Fast Moisture Content Measuring Method for Grains Based on an Ultra-Wideband (UWB) Radar Module and the Mode Matching Method

Use of dielectric mixture equations for the characterization of uncleaned peanuts

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