Ring-core flux-gate magnetometer with microprocessor

Kilić, Tomislav; Boršić, Mladen; Milun, Stanko

doi:10.1016/s0263-2241(98)00066-9

Cited by 4 publications

(2 citation statements)

References 5 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…T . Kilić et al reported that the sensitivity of the fluxgate sensor depends on the relative permeability and the cross-sectional area of the core, the excitation frequency, the turn number of detection coil, and the ratio of the saturation magnetic field value (H s ) and the maximum excitation magnetic field value (H m ) [7] . As the saturation magnetization of the Fe-Ni-Co ring core is much higher than that of the Fe-Ni one, the H s of the Fe-Ni-Co ring core is larger than that of the Fe-Ni one .…”

mentioning

confidence: 99%

Temperature characteristics of a fluxgate current sensor with Fe-Ni-Co ring core

Watanabe

Otsubo

Yanai

et al. 2015

2015 IEEE Magnetics Conference (INTERMAG)

View full text Add to dashboard Cite

I. INTRODUCTIONFluxgate sensors are widely used in many facilities as a current sensor with high sensitivity, and a Co-based amorphous ribbon or an Fe-Ni-based alloy is commonly used as a core material for them . Although the sensors using these materials have high sensitivity, the temperature variation of the sensitivity is large due to their low Curie temperatures (200 -400 o C) [1][2][3] . Therefore, development of fluxgate current sensors with high robustness against the variation of temperature is required, and we focused on soft magnetic Fe-Ni-Co alloys with high Curie temperature . In this study, we fabricated a fluxgate current sensor with Fe-Ni-Co ring core, and evaluated the effect of temperature on the sensitivity . II. EXPERIMANTAL PROCEDURESSince the fluxgate current sensor needs to be driven at high frequency, we need to reduce the eddy current loss in the Fe-Ni-Co ring core . One of effective methods to reduce the eddy current loss is reduction in the thickness of the core . In order to fabricate the thin ring core, we used an electroplating method in this study . The electroplating conditions were decided based on our previous studies for the electroplated Fe-Ni films [4][5][6] . The Fe-Ni-Co films were plated on the Cu ring (ID: φ36 .7 mm, OD: φ44 .1 mm), and we obtained approx . 20 μm-thick Fe 15 Ni 46 Co 39 ring core . A fluxgate current sensor was fabricated using the ring core and a resin case . The turn number of excitation coil and detection coil were 100 and 300 turns, respectively . The excitation current in all cases was fixed a 1 kHz triangle wave, and the excitation current varied in the range between 220 mA and 430 mA . In order to compare the temperature characteristics of the sensitivity, we also fabricated a fluxgate current sensor with approx . 20 μm-thick Fe 21 Ni 79 ring core . The sensor was placed in a constant temperature bath, and the measurement temperature varied from -10 to +125 o C . We applied dc current from -3 A to +3 A to a conducting wire passed through the center of the sensor . We carried out a FFT signal processing for the sensor output, and detected the applied current values using the second harmonic voltage in the output . We obtained a plot data consisting of a total of 55 points, and calculated the sensor sensitivity by using the least squares approximation method . Figure 1(a) shows the sensor output as a function of the measurement current in two sensor comprising each Fe-Ni and Fe-Ni-Co ring core, respectively . As shown in Fig . 1(a), the sensitivity of a sensor with the Fe-Ni-Co core is superior to that for a sensor with the Fe-Ni one under the same excitation conditions . The measurement in the induced voltage waveform of the detection coil indicated that the saturation magnetic field of the Fe-Ni core is less than that for the Fe-Ni-Co core . T . Kilić et al. reported that the sensitivity of the fluxgate sensor depends on the relative permeability and the cross-sectional area of the core, the excitation frequency, the turn number of detection coil, an...

show abstract

mentioning

confidence: 99%

Temperature characteristics of a fluxgate current sensor with Fe-Ni-Co ring core

Watanabe

Otsubo

Yanai

et al. 2015

2015 IEEE Magnetics Conference (INTERMAG)

View full text Add to dashboard Cite

show abstract

“…Due to the mentioned virtues ring-core based sensors have found wide application. However, optimal design solutions are still sought for [4,5]. For example, sensors based on oval cores may be found in use [6].…”

Section: Introductionmentioning

confidence: 99%