Detection and Imaging of Magnetic Field in the Microwave Regime With a Combination of Magnetic Losses Material and Thermofluorescent Molecules

Ragazzo, Hugo; Faure, Stéphane; Carrey, Julian; Issac, F.; Prost, D.; Bobo, Jean-François

doi:10.1109/tmag.2018.2860520

Cited by 9 publications

(9 citation statements)

References 4 publications

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“…This law can then be implemented in the demodulation algorithm to convert the fluorescence relative variation into heat for other experiments using the same film. The visiblethermography image with 470-nm LED array excitation obtained on a seven-digit ZOR antenna shows similar results [18]. A comparison of the image profiles collected by the EMIR and EMVI methods in Ref.…”

Section: -8supporting

confidence: 54%

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Electromagnetic Field Intensity Imaging by Thermofluorescence in the Visible Range

et al. 2019

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Methods to measure the electromagnetic field intensity on a large scale should be improved to meet the growing demand in civil and military applications. The recent development and an application of a microwave electromagnetic field imaging method using a thermofluorescent device and detection in the visible-light range are described. The sensor is a flexible film sensitive to either an electric field (slightly conductive film) or a magnetic field (insulating film with ferromagnetic particles) coated with a polymer doped with fluorescent molecules displaying temperature-dependent emission. We use a lock-in thermography protocol consisting of modulation of the field at low frequency, which allows us to suppress the noise due to heat-transfer phenomena and the part of the signal not directly related to field absorption. Two applications of the method are presented: (i) imaging the microwave magnetic field emitted by a resonator antenna and (ii) the local probe measurement of the electric field inside a multibeam antenna. The process to develop the sensitive film, its detailed characterization, and the thermofluorescence-image demodulation postprocessing are presented in detail. This approach is much cheaper than one based on infrared thermometry and could permit democratization of microwave-and radio-frequency electromagnetic field imaging.

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Section: -8supporting

confidence: 54%

“…We recently designed such sensitive films and successfully demonstrated the possibility to image in the visible range the microwave magnetic field emitted in the near field of a zeroth-order resonator (ZOR) antenna in the visible range [18].…”

Section: Introductionmentioning

confidence: 99%

Electromagnetic Field Intensity Imaging by Thermofluorescence in the Visible Range

et al. 2019

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“…Finally, the obtained fluorophore layer thickness is roughly 100 µm on this sample (Figure 3). Figure 4 represents the schematics of the EMVI setup [7]. The microwave emitter is modulated (typically at 0.2 Hz).…”

Section: B Fluorescence Loadingmentioning

confidence: 99%

“…It can also be noticed that the film is relatively non-intrusive in so far as the resonance peaks are almost not affected. Figure 6: S12 measurement of the HIS, with and without the thermoemissive film [7] IV. IMAGING NEAR FIELD OF HIS…”

Section: High Impedance Surface (His)mentioning

confidence: 99%

“…The fluorescence variation is extracted from the signal by demodulation at the magnetic field modulation frequency deduced from the fit of one pixel. The amplitude of magnetic and electric field is proportional to the square root of the heating according to equations (4) and (7). Figure 9, 10, 11 and 12 are images of the magnetic and electric fields, for two frequencies.…”

Section: B Measurementmentioning

confidence: 99%

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Thermo-fluorescent images of electric and magnetic near-fields of a High Impedance Surface

Ragazzo

Prost

Issac

et al. 2019

2019 International Symposium on Electromagnetic Compatibility - EMC EUROPE

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The characterization of the electromagnetic field emitted by various sources (antenna, radar...) is an important issue, either for civil or defense applications. The measurement of the electromagnetic field may be performed by a local probe, but the infrared thermography imaging is an alternative way. The latter method, called EMIR [1] (ElectroMagnetic InfraRed) has been used for years in particular at ONERA where it had been developed. We have recently successfully implemented this technique in the domain of visible light, named as EMVI [2]. As in the EMIR method, a thin film (sensitive to either electric field or magnetic field) is heated by the emitted field. But here the film is coated with a polymer doped with fluorescent molecules. As the fluorescent emission depends on the temperature of the film, we get a thermofluorescent sensor. The results presented here illustrate that new method: both magnetic and electric field imaging of a High Impedance Surface (HIS) has thus been obtained.

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A recent survey on zeroth-order resonant (ZOR) antennas

Roy

Sinha

Das

et al. 2022

Analog Integr Circ Sig Process

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Detection and Imaging of Magnetic Field in the Microwave Regime With a Combination of Magnetic Losses Material and Thermofluorescent Molecules

Cited by 9 publications

References 4 publications

Electromagnetic Field Intensity Imaging by Thermofluorescence in the Visible Range

Electromagnetic Field Intensity Imaging by Thermofluorescence in the Visible Range

Thermo-fluorescent images of electric and magnetic near-fields of a High Impedance Surface

A recent survey on zeroth-order resonant (ZOR) antennas

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