Dual-Frequency Sensor for Thick Rind Fruit Quality Assessment

Kittiyanpunya, Chainarong; Phongcharoenpanich, Chuwong; Krairiksh, M.

doi:10.1109/tim.2020.2986143

Cited by 4 publications

(6 citation statements)

References 23 publications

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“…In addition, our research has been previously published as cited in Kittiyanpunya et al. (2020), whose results indicated that the single‐frequency scheme achieved lower accuracy in the classification of pomelo. Therefore, many citations confirmed that the dual‐frequency antenna is compatible with the sensor application and has higher accuracy than using single‐frequency antennas.…”

Section: Introductionsupporting

confidence: 61%

“…In this paper, the dual‐frequency band of the printed directional antenna is based on using a 1‐GHz/2.3‐GHz dual‐frequency sensor system as cited in Kittiyanpunya et al. (2020). The printed dipole with a different shape is used as a radiating element to replace two single‐resonance straight dipoles.…”

Section: Introductionmentioning

confidence: 99%

“…Recently, 1‐GHz/2.3‐GHz dual‐frequency antennas have been deployed in pomelo quality assessment as referred to (Kittiyanpunya et al., 2020) for radiating and capturing signals. However, the dual‐frequency sensor system shows a massive size and discomfort when installing adjacent antennas.…”

Section: Introductionmentioning

confidence: 99%

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Printed Dual‐Frequency Directional Antenna Loaded With Dual‐Parasitic Strip

Kittiyanpunya,

Chomdee

2023

Radio Science

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In this paper, the directional antenna is developed to construct the printed dual‐frequency directional antenna for a 1‐GHz/2.3‐GHz dual‐frequency sensor application. An auxiliary dipole element generating the higher resonant mode is set on a primary dipole element introducing the lower resonant mode. The feed balance is also designed to cover the desired frequency between two resonance frequencies, which is based on the microstrip line (MS) to coplanar stripline (CPS) transition. To realize the directional antenna, two reflector elements are utilized, and one of them is a stepped‐width reflector on reducing the size of the antenna. In addition, the parasitic strip works as the lumped element used to obtain good impedance matching. A series of simulations are performed on the MS‐to‐CPS transition, the dual dipole element, the reflectors, and the parasitic strip to determine the optimal antenna design. A prototype is fabricated based on the optimal results of the simulation. Concerning the measured results, the proposed antenna has well unidirectional radiations, good radiation efficiencies, and low cross‐polarization levels at any operating frequencies.

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Section: Introductionsupporting

confidence: 61%

Section: Introductionmentioning

confidence: 99%

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Printed Dual‐Frequency Directional Antenna Loaded With Dual‐Parasitic Strip

Kittiyanpunya,

Chomdee

2023

Radio Science

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“…The large number of reports published in the past two decades, show an active, and highly motivated research concerning the development of various nondestructive technologies for the assessment of quality and ripening parameters of a wide variety of fruit, including citrus [16,[33][34][35][36][37]. These techniques are used on inline sorting systems, on the bench or in the field and come in many forms, prices and commercial brands.…”

Section: Introductionmentioning

confidence: 99%

Nondestructive Assessment of Citrus Fruit Quality and Ripening by Visible–Near Infrared Reflectance Spectroscopy

Cavaco¹,

Passos²,

Pires³

et al. 2021

Citrus - Research, Development and Biotechnology

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As non-climacteric, citrus fruit are only harvested at their optimal edible ripening stage. The usual approach followed by producers and packinghouses to establish the internal quality and ripening of citrus fruit is to collect fruit sets throughout ripening and use them to determine the quality attributes (QA) by standard and, in many cases, destructive and time-consuming methods. However, due to the large variability within and between orchards, the number of measured fruits is seldom statistically representative of the batch, resulting in a fallible assessment of their internal QA (IQA) and a weak traceability in the citrus supply chain. Visible/near-infrared reflectance spectroscopy (Vis–NIRS) is a nondestructive method that addresses this problem, and has proved to predict many IQA of a wide number of fruit including citrus. Yet, its application on a daily basis is not straightforward, and there are still several questions to address by researchers in order to implement it routinely in the crop supply chain. This chapter reviews the application of Vis–NIRS in the assessment of the quality and ripening of citrus fruit, and makes a critical evaluation on the technique’s limiting issues that need further attention by researchers.

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“…Microwave devices including antennas and split-ring resonators (SRRs) can be used as planar sensors to detect changes in permittivity, loss tangent, and conductivity on or around their surface. − These sensors have been developed in recent years to be extremely sensitive to small changes in the near-field environment. − When the dielectric properties, around the resonator change, the resonant frequency, resonant amplitude, and quality factor also change accordingly . These variations can be measured, analyzed, and used to characterize the material on the sensor to determine its dielectric properties, as well as the rates of change for any transient processes (freezing, melting, heating, chemical reactions, etc.).…”

Section: Introductionmentioning

confidence: 99%

Modified Microwave Sensor with a Patterned Ground Heater for Detection and Prevention of Ice Accumulation

Kozak

Wiltshire

Khandoker

et al. 2020

ACS Appl. Mater. Interfaces

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Ice accumulation on aircraft is known to negatively impact the aerodynamic and mechanical operation, sometimes resulting in catastrophic failure. Recently, microwave resonators have gained interest as durable and reliable frost and ice detectors. Here, a microwave resonator sensor with built-in heating capability patterned into the ground plane was designed, fabricated, and tested to investigate real-time ice and frost growth. Sensing was performed on surfaces with anti-icing coatings to quantitatively analyze the effectiveness of these materials. The sensor was also tested to determine its ability to evaluate different deicing methods. The sensor itself was a split-ring resonator (SRR) operating at 5.82 GHz, which could effectively distinguish between water and ice by detecting changes in the dielectric properties on or around its surface. This application was particularly suited for an SRR due to the extreme difference between the relative permittivity of water (ε = 90) and ice (ε = 3.2) at 5 GHz and 0 °C. The results from this sensor can be used to determine the holdover time of various coatings to resist ice formation. This study validates the use of SRRs as ice detection sensors for applications where ice and frost are of great interest, such as on aircraft, roads, or walkways.

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Dual-Frequency Sensor for Thick Rind Fruit Quality Assessment

Cited by 4 publications

References 23 publications

Printed Dual‐Frequency Directional Antenna Loaded With Dual‐Parasitic Strip

Printed Dual‐Frequency Directional Antenna Loaded With Dual‐Parasitic Strip

Nondestructive Assessment of Citrus Fruit Quality and Ripening by Visible–Near Infrared Reflectance Spectroscopy

Modified Microwave Sensor with a Patterned Ground Heater for Detection and Prevention of Ice Accumulation

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