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Sensors 2017, 17(10), 2325; doi:10.3390/s17102325

A High Stability Time Difference Readout Technique of RTD-Fluxgate Sensors

1
College of Instrumentation & Electrical Engineering, Jilin University, No. 938 Ximinzhu Street, Changchun 130026, China
2
College of Information Technology and Media, Beihua University, No. 3999 East Binjiang Road, Jilin 132013, China
*
Author to whom correspondence should be addressed.
Received: 4 September 2017 / Revised: 28 September 2017 / Accepted: 9 October 2017 / Published: 12 October 2017
(This article belongs to the Section Physical Sensors)
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Abstract

The performance of Residence Times Difference (RTD)-fluxgate sensors is closely related to the time difference readout technique. The noise of the induction signal affects the quality of the output signal of the following circuit and the time difference detection, so the stability of the sensor is limited. Based on the analysis of the uncertainty of the RTD-fluxgate using the Bidirectional Magnetic Saturation Time Difference (BMSTD) readout scheme, the relationship between the saturation state of the magnetic core and the target (DC) magnetic field is studied in this article. It is proposed that combining the excitation and induction signals can provide the Negative Magnetic Saturation Time (NMST), which is a detection quantity used to measure the target magnetic field. Also, a mathematical model of output response between NMST and the target magnetic field is established, which analyzes the output NMST and sensitivity of the RTD-fluxgate sensor under different excitation conditions and is compared to the BMSTD readout scheme. The experiment results indicate that this technique can effectively reduce the noise influence. The fluctuation of time difference is less than ±0.1 μs in a target magnetic field range of ±5 × 104 nT. The accuracy and stability of the sensor are improved, so the RTD-fluxgate using the readout technique of high stability time difference is suitable for detecting weak magnetic fields. View Full-Text
Keywords: RTD-fluxgate; negative magnetic saturation time; readout scheme; time difference RTD-fluxgate; negative magnetic saturation time; readout scheme; time difference
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Pang, N.; Cheng, D.; Wang, Y. A High Stability Time Difference Readout Technique of RTD-Fluxgate Sensors. Sensors 2017, 17, 2325.

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