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首页> 外文期刊>IEEE Transactions on Magnetics >Detection and Imaging of Magnetic Field in the Microwave Regime With a Combination of Magnetic Losses Material and Thermofluorescent Molecules
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Detection and Imaging of Magnetic Field in the Microwave Regime With a Combination of Magnetic Losses Material and Thermofluorescent Molecules

机译：结合磁损耗材料和热荧光分子的微波状态下磁场的检测和成像

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摘要

Characterization of the electromagnetic field emitted by various sources (antenna, radar, etc.) is an important issue, either for civil or defense applications. The measurement of electromagnetic field may be performed either by local probes or by thermography imaging, in particular with an infrared camera. The latter method, called electromagnetic infrared (EMIR) has been developed several years ago. We have recently successfully implemented this technique in the domain of visible light thanks to the combination of a film sensitive to either electric field (slightly conductive film) or magnetic field (insulating film with ferromagnetic particles) and a polymer coating doped with fluorescent molecules with an emission depending on temperature, indeed a thermofluorescent sensor. We present our recent results obtained imaging the microwave magnetic field emitted in the near field of a zeroth-order resonator (ZOR) antenna. The sensing film is a stack of FLEX-TOKIN magnetic absorber, already tested by EMIR infrared thermography in our group. A 20 mu m film composed of a mixture of rhodamine B (RhB) in an epoxy matrix is screen printed on the FLEX surface. RhB, in ethanol solution, has a thermofluorescence coefficient of similar to 2%/K at room temperature at its maximum of fluorescence of 595 nm. Excitation light is delivered by an array of blue 470 nm LEDs. The 4.29 GHz microwave excitation of the ZOR device is amplitude modulated at 0.1-0.5 Hz in order to cancel any thermal drift and convection of the thermofluorescence image. Low-frequency excitation modulation also allows noise cancellation via image pixel demodulation postprocessing. We present the deduced temperature mapping of the sensing film placed 2 mm above the ZOR patch antenna.
机译：对于民用或国防应用，表征各种源（天线，雷达等）发出的电磁场是一个重要的问题。电磁场的测量既可以通过局部探头进行，也可以通过热成像进行，特别是使用红外热像仪。几年前已经开发出了后一种方法，称为电磁红外（EMIR）。由于结合了对电场敏感的薄膜（略微导电的薄膜）或对磁场敏感的薄膜（具有铁磁粒子的绝缘薄膜）和掺杂有荧光分子的聚合物涂层，我们最近在可见光领域成功实现了该技术。发射取决于温度，实际上是热荧光传感器。我们提出我们最近的结果获得成像成像在零阶谐振器（ZOR）天线的近场中发射的微波磁场。传感膜是一叠FLEX-TOKIN磁吸收体，已经在我们的小组中通过EMIR红外热像仪进行了测试。由罗丹明B（RhB）在环氧基质中的混合物组成的20微米薄膜丝网印刷在FLEX表面上。乙醇溶液中的RhB在室温下的最大荧光强度为595 nm，其热荧光系数接近2％/ K。激发光由蓝色470 nm蓝色LED阵列发出。 ZOR器件的4.29 GHz微波激发在0.1-0.5 Hz处进行幅度调制，以消除热荧光图像的任何热漂移和对流。低频激励调制还允许通过图像像素解调后处理消除噪声。我们介绍了在ZOR贴片天线上方2 mm处放置的感应膜的推断温度映射。

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