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首页> 外文期刊>International journal of hyperthermia: The official journal of European Society for Hyperthermic Oncology, North American Hyperthermia Group >Accuracy of electrical field measurement using the flexible Schottky diode sheet at 433 MHz.
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Accuracy of electrical field measurement using the flexible Schottky diode sheet at 433 MHz.

机译：使用柔性肖特基二极管片在433 MHz下进行电场测量的精度。

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摘要

In this study, the accuracy of Schottky diode sensors mounted as a two-dimensional array on a flexible 125 micro m thick polyester foil has been studied. The diodes are placed at a distance of 2.5 x 2.5 cm, resulting in a measuring area of 20 x 20 cm. The diodes are placed across the gap between both arms (3 x 5 mm) of a dipole, total length 12 mm. High resistance (1 M Omega/m) carbon transmission lines printed on the sheet are used to connect each electrical (E) field sensor to the read-out electronics and a data-acquisition system. It is demonstrated that the flexible Schottky diode sheet can quantitatively measure E-field distributions at 433 MHz with an overall accuracy of approximately 6% (1 SD). The largest contribution to the inaccuracy is related to the phantom heterogeneity. The absolute sensitivity of this electrical field sensor is 0.71 V/m per V/m of the applied external electromagnetic field. The DC-voltage signal of the diodes shows a more or less square root relation to the RF-power applied to the applicator over a 15-fold range. An important feature of the system is that it provides the ability to perform on-line monitoring of the E-field, i.e. the SAR distribution of 433 MHz applicators. Further, it enables the introduction of fast and easy quality control protocols for superficial hyperthermia applicators.
机译：在这项研究中，已研究了以二维阵列形式安装在125微米厚的柔性聚酯箔片上的肖特基二极管传感器的精度。二极管之间的距离为2.5 x 2.5 cm，测量面积为20 x 20 cm。二极管跨过偶极子的两个臂之间的间隙（3 x 5毫米），总长度为12毫米。印在纸上的高电阻（1 M Omega / m）碳传输线用于将每个电（E）场传感器连接到读出电子设备和数据采集系统。结果表明，柔性肖特基二极管片可以定量测量433 MHz处的电场分布，总体精度约为6％（1 SD）。对不准确性的最大贡献与幻像异质性有关。该电场传感器的绝对灵敏度为每施加的外部电磁场V / m 0.71 V / m。二极管的DC电压信号在15倍范围内与施加到施加器的RF功率或多或少呈平方根关系。该系统的重要特征是它提供了对电场进行在线监视的能力，即433 MHz施加器的SAR分布。此外，它能够为浅层热敷药器引入快速简便的质量控制方案。

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