Development of a compact sub-terahertz gyrotron and its application to t-ray real-time imaging for food inspection

Han, Sang‐Min; Park, Wook Ki; Ahn, Young-Hwan; Lee, Wangjoo; Chun, Hyang Sook

doi:10.1109/irmmw-thz.2012.6380390

Cited by 8 publications

(6 citation statements)

References 6 publications

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“…Han, Park, and Chun () used a sub‐THz gyrotron as a radiation source to produce a CW at 408 GHz for real‐time inspection of foreign bodies (Han et al., ). Using the first version of their gyrotron system, that is, KG1, they detected metallic and soft objects in a cracker (Han, Park, Ahn, Lee, & Chun, ). They also showed that their system can perform real‐time inspection for in‐shell peanuts and distinguish between full and empty peanut shells.…”

Section: Food Applications Of Thz Spectroscopy and Imagingmentioning

confidence: 99%

A Comprehensive Review on Food Applications of Terahertz Spectroscopy and Imaging

Afsah‐Hejri

Hajeb

Ara

et al. 2019

Comp Rev Food Sci Food Safe

224

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Food product safety is a public health concern. Most of the food safety analytical and detection methods are expensive, labor intensive, and time consuming. A safe, rapid, reliable, and nondestructive detection method is needed to assure consumers that food products are safe to consume. Terahertz (THz) radiation, which has properties of both microwave and infrared, can penetrate and interact with many commonly used materials. Owing to the technological developments in sources and detectors, THz spectroscopic imaging has transitioned from a laboratory‐scale technique into a versatile imaging tool with many practical applications. In recent years, THz imaging has been shown to have great potential as an emerging nondestructive tool for food inspection. THz spectroscopy provides qualitative and quantitative information about food samples. The main applications of THz in food industries include detection of moisture, foreign bodies, inspection, and quality control. Other applications of THz technology in the food industry include detection of harmful compounds, antibiotics, and microorganisms. THz spectroscopy is a great tool for characterization of carbohydrates, amino acids, fatty acids, and vitamins. Despite its potential applications, THz technology has some limitations, such as limited penetration, scattering effect, limited sensitivity, and low limit of detection. THz technology is still expensive, and there is no available THz database library for food compounds. The scanning speed needs to be improved in the future generations of THz systems. Although many technological aspects need to be improved, THz technology has already been established in the food industry as a powerful tool with great detection and quantification ability. This paper reviews various applications of THz spectroscopy and imaging in the food industry.

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Section: Food Applications Of Thz Spectroscopy and Imagingmentioning

confidence: 99%

A Comprehensive Review on Food Applications of Terahertz Spectroscopy and Imaging

Afsah‐Hejri

Hajeb

Ara

et al. 2019

Comp Rev Food Sci Food Safe

224

View full text Add to dashboard Cite

show abstract

“…In this respect, the gyrotron radiation (with its sub-THz and THz frequencies and several orders of magnitude higher output powers) offers complementary/alternative solutions. Although these advantages have not been fully realized so far, a series of recent investigations have demonstrated the potential of the systems for food inspection and control based on imaging with gyrotrons [12,[92][93][94][95][96].…”

Section: Imaging Food Inspection and Quality Control Using Gyrotronmentioning

confidence: 99%

“…In a series of works by S.-T. Han et al (see, e.g., [92][93][94][95][96]) the capabilities of a non-invasive real-time imaging system that uses a gyrotron as a radiation source have been investigated in detail and demonstrated successfully. For instance, in [92], an active real-time imaging system employing a CW 460-GHz gyrotron and a pyroelectric array camera with 124 × 124 pixels has been presented.…”

Section: Imaging Food Inspection and Quality Control Using Gyrotronmentioning

confidence: 99%

The Gyrotrons as Promising Radiation Sources for THz Sensing and Imaging

et al. 2020

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The gyrotrons are powerful sources of coherent radiation that can operate in both pulsed and CW (continuous wave) regimes. Their recent advancement toward higher frequencies reached the terahertz (THz) region and opened the road to many new applications in the broad fields of high-power terahertz science and technologies. Among them are advanced spectroscopic techniques, most notably NMR-DNP (nuclear magnetic resonance with signal enhancement through dynamic nuclear polarization, ESR (electron spin resonance) spectroscopy, precise spectroscopy for measuring the HFS (hyperfine splitting) of positronium, etc. Other prominent applications include materials processing (e.g., thermal treatment as well as the sintering of advanced ceramics), remote detection of concealed radioactive materials, radars, and biological and medical research, just to name a few. Among prospective and emerging applications that utilize the gyrotrons as radiation sources are imaging and sensing for inspection and control in various technological processes (for example, food production, security, etc). In this paper, we overview the current status of the research in this field and show that the gyrotrons are promising radiation sources for THz sensing and imaging based on both the existent and anticipated novel techniques and methods.

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“…A sub‐terahertz electron cyclotron resonance maser (gyrotron) was developed by Han, Park, Ahn, Lee, and Chun () to visualize foreign bodies in a cracker product. The gyrotron is selected as it can generate a high output power with good spatial patterns in a sub‐THz region.…”

Section: Noninvasive Techniquesmentioning

confidence: 99%

“…Several sizes of high and low-density materials were inserted into a powdered instant noodle to contaminate the product. For high density materials, an A sub-terahertz electron cyclotron resonance maser (gyrotron) was developed by Han, Park, Ahn, Lee, and Chun (2012) to visualize foreign bodies in a cracker product. The gyrotron is selected as it can generate a high output power with good spatial patterns in a sub-THz region.…”

Section: Terahertzmentioning

confidence: 99%

Noninvasive techniques for detection of foreign bodies in food: A review

Khairi

Ibrahim

Yunus

et al. 2018

J Food Process Engineering

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Foreign body in food is a matter of concern in food industry as it determines the safety and quality of the product. This issue leads to anxiety as it is hazardous if it is accidentally being consumed. Therefore, foreign body detection is urgently needed. Noninvasive techniques are attractive as they can be used to evaluate without altering the originality of the food products in terms of ingredient and structure. With the growing interest in this subject, this article reviews the development of noninvasive techniques including X‐ray, thermal imaging, near‐infrared spectroscopy, hyperspectral imaging, ultrasonic, and terahertz. The principle and application of each technique are elaborated. The performances and limitations from previous studies in several types of food applications are analyzed. In addition, future trends and challenges encountered with these techniques are highlighted. It is envisaged that the information gathered in this article will be a valuable source of information for researchers working in this topic. Practical applications The existence of foreign bodies in food causes degradation of their quality and safety. The implementation of the noninvasive technique as a monitoring tool have received an encouraging response from the manufacturers which endeavors to maintain their credibility and reputation. This review serves to provide an up‐to‐date development on the noninvasive technique for detecting foreign bodies which is useful for academicians and researchers especially from the food processing industries.

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Development of a compact sub-terahertz gyrotron and its application to t-ray real-time imaging for food inspection

Cited by 8 publications

References 6 publications

A Comprehensive Review on Food Applications of Terahertz Spectroscopy and Imaging

A Comprehensive Review on Food Applications of Terahertz Spectroscopy and Imaging

The Gyrotrons as Promising Radiation Sources for THz Sensing and Imaging

Noninvasive techniques for detection of foreign bodies in food: A review

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