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.
Highlights
The fluxgate sensor has been widely used in geomagnetic observation, space magnetic field measurement, and other fields due to its high sensitivity, small size, and low power consumption, etc. [1,2,3,4,5]
The Residence Times Difference (RTD)-fluxgate sensor developed by Bruno Andò, et al, using the hysteresis saturation phenomenon of soft magnetic material, can detect magnetic fields through the corresponding relationship between the residence times difference of the induction pulse signal and the target magnetic field [6,7,8], and has the advantages of a simple detection procedure, strong anti-interference ability, easy miniaturization, and digitization, etc
On the basis of analyzing the working principle of the RTD-fluxgate sensor, in this paper, a new method of time difference reading between the excitation signal passing through the zero point as a reference time and the negative output pulse is proposed, that is, the excitation signal and the output pulse signal are combined to read the negative magnetic saturation time ∆TNMST as the detection quantity to measure the target magnetic field
Summary
The fluxgate sensor has been widely used in geomagnetic observation, space magnetic field measurement, and other fields due to its high sensitivity, small size, and low power consumption, etc. [1,2,3,4,5]. The error of locating the peak points can be avoided, the threshold has to be set Even in this case, the magnetic noise and electrical noise cause the transverse instability of the induction signal, resulting in the uncertainty of the time difference readout. On the basis of analyzing the working principle of the RTD-fluxgate sensor, in this paper, a new method of time difference reading between the excitation signal passing through the zero point as a reference time and the negative output pulse is proposed, that is, the excitation signal and the output pulse signal are combined to read the negative magnetic saturation time ∆TNMST as the detection quantity to measure the target magnetic field.
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
