کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
6879117 | 1443108 | 2018 | 4 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Electronic technique and circuit topology for accurate distance-independent contactless readout of passive LC sensors
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موضوعات مرتبط
مهندسی و علوم پایه
مهندسی کامپیوتر
شبکه های کامپیوتری و ارتباطات
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
Contactless readout of passive LC sensors composed of a capacitance sensor connected to a coil can be performed through a readout coil electromagnetically coupled with the sensor coil. Resonant frequency and quality factor can be extracted from the impedance measured at the readout coil by a technique which results theoretically independent of the coupling, and, therefore, the distance between the readout and the sensor coils. However, the effect of the unavoidable parasitic capacitance connected to the readout coil introduces in practice an undesired dependence of the measured values on the distance between the coils, resulting in a decreased accuracy. In this paper, such dependence is predicted by the results of a numerical analysis and experimentally verified. To overcome this limitation, a novel electronic technique and circuit topology for the compensation of the readout parasitic capacitance is proposed. The experimental results show that the compensation technique allows to read the resonant frequency of a LC pair at around 5.3â¯MHz with a variation of less than 200â¯ppm across an interrogation distance between 2 and 24â¯mm.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: AEU - International Journal of Electronics and Communications - Volume 92, August 2018, Pages 82-85
Journal: AEU - International Journal of Electronics and Communications - Volume 92, August 2018, Pages 82-85
نویسندگان
Marco Demori, Marco Baù, Marco Ferrari, Vittorio Ferrari,