A low noise stable radiometer front-end for passive microwave tissue thermometry

Ravi, Vidyalakshmi M.; Arunachalam, Kavitha

doi:10.1080/09205071.2019.1576063

Cited by 12 publications

(3 citation statements)

References 19 publications

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“…The measurement principle is to send out microwaves actively and to register the reflected waves or the inherent radiation in the microwave frequency range. In medical applications, radiometry is used for contactless, noninvasive internal body and human tissue temperature measurement (Cresson et al., 2008; Ravi & Arunachalam, 2019).…”

Section: Methods Using Physical Effects To Determine the Samples’ Tem...mentioning

confidence: 99%

Critical assessment of methods for measurement of temperature profiles and heat load history in microwave heating processes—A review

Kalinke

Kubbutat

Dinani

et al. 2022

Comp Rev Food Sci Food Safe

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Limitations of microwave processing due to inhomogeneities of power input and energy absorption have been widely described. Over‐ and underheated product areas influence reproducibility, product quality, and possibly safety. Although a broad range of methods is available for temperature measurement and evaluation of time/temperature effects, none of them is sufficiently able to detect temperature differences and thermally induced effects within the product caused by inhomogeneous heating. The purpose of this review is to critically assess different methods of temperature measurement for their suitability for different microwave applications, namely metallic temperature sensors, thermal imaging, pyrometer measurement, fiber optic sensors, microwave radiometry, magnetic resonance imaging, liquid crystal thermography, thermal paper, and biological and chemical time‐temperature indicators. These methods are evaluated according to their advantages and limitations, method characteristics, and potential interference with the electric field. Special attention is given to spatial resolution, accuracy, handling, and purpose of measurement, that is, development work or online production control. Differences of methods and examples of practical application and failure in microwave‐assisted food processing are discussed with a special focus on microwave pasteurization and microwave‐assisted drying. Based on this assessment, it is suggested that infrared cameras for measuring temperature distribution at the product surface and partially inside the product in combination with a chemical time/temperature indicator (e.g., Maillard reaction, generating heat‐induced color variations, depending on local energy absorption) appear to be the most appropriate system for future practical application in microwave food process control, microwave system development, and product design. Reliable detection of inhomogeneous heating is a prerequisite to counteracte inhomogeneity by a targeted adjustment of process and product parameters in microwave applications.

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Section: Methods Using Physical Effects To Determine the Samples’ Tem...mentioning

confidence: 99%

Critical assessment of methods for measurement of temperature profiles and heat load history in microwave heating processes—A review

Kalinke

Kubbutat

Dinani

et al. 2022

Comp Rev Food Sci Food Safe

View full text Add to dashboard Cite

show abstract

“…The device described in [30][31][32][33] are based on a total-power radiometer and do not contain nonreciprocal elements. So far, there are few experimental data in scientific literature demonstrating how measurement results of such devices change with a change of impedance of the biological object (BO) under study.…”

Section: Literature Review and Problem Statementmentioning

confidence: 99%

Research of a microwave radiometer for monitoring of internal temperature of biological tissues

Vesnin

Sedankin

Leushin

et al. 2019

EEJET

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“…Bolus sizes are usually slightly larger than or equal to the size of the antenna aperture. The following classes of printed antennas can be distinguished: spiral antennas [7][8][9], elliptical antennas [10], patch antennas [11,12], slot antennas [13][14][15][16][17][18] and dipole or vibrator printed antennas [19]. For fig.1 the main types of existing antennas are presented.…”

Section: Introductionmentioning

confidence: 99%

Numerical simulation of miniature antennas applicators of microwave radiometry for diagnostics of the functional state of the brain

et al. 2019

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This paper describes the use of Finite Difference Time Domain technique of numerical modeling for development and simulation symmetrical dipole with triangular shoulders placed in a cylindrical housing and a spiral antenna placed in a cylindrical housing for use in microwave radiometry. The new sensors have been tested and validated on different phantoms and biological tissues. Results suggest sufficient characteristics of broadband antennas for potential use in brain functional diagnostics.

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A low noise stable radiometer front-end for passive microwave tissue thermometry

Cited by 12 publications

References 19 publications

Critical assessment of methods for measurement of temperature profiles and heat load history in microwave heating processes—A review

Critical assessment of methods for measurement of temperature profiles and heat load history in microwave heating processes—A review

Research of a microwave radiometer for monitoring of internal temperature of biological tissues

Numerical simulation of miniature antennas applicators of microwave radiometry for diagnostics of the functional state of the brain

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