期刊
IEEE SENSORS JOURNAL
卷 19, 期 18, 页码 8000-8008出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/JSEN.2019.2914965
关键词
Delay line sensor; frequency detection; magnetic field detection; open-loop vs. closed-loop; phase detection; phase noise; readout systems; surface acoustic wave sensor
资金
- German Research Foundation Deutsche Forschungsgemeinschaft (DFG) through the Collaborative Research Centre [CRC 1261]
- ANR Programme d'Investissement d'Avenir (PIA) under the Oscillator IMP Project [11-EQPX-0033]
- FIRST-TF Network [10-LABX-0048]
- Region Bourgogne Franche-Comte
Transmission surface acoustic wave (SAW) sensors are widely used in various fields of application. In order to improve the limit of detection (LOD) of such sensor systems, it is essential to understand and quantify the relevant noise sources. Only then, strategies for noise reduction can he developed. In this paper, low noise readout systems for the application with SAW sensors in open-loop and closed-loop configurations are presented and experimentally investigated with regard to their phase noise on the example of a SAW delay line magnetic field sensor. Besides a comprehensive analysis of the phase- and frequency modulated signals, respectively, previously derived equations in a theoretic study for describing the LOD of both readout structures are utilized in the experimental context. According to the theory, the same LOD is also obtained in the experiment for all frequencies for which the noise contributions of the readout electronics are negligible. To the best of our knowledge, this is the first experimental study that directly compares both operating modes for the same sensor and in terms of the overall achievable LOD. The results are applicable to all kinds of phase-sensitive delay-line sensors.
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