Abstract
A model of the fluxgate magnetometer based on the field
interactions in the fluxgate core has been derived. The
non-linearity of the ringcore sensors due to large uncompensated
fields transverse to the measuring axis are calculated and
compared with measurements. Measurements of the non-linearity are
made with a spectrum analyser, measuring the higher harmonics of
an applied sinusoidal field. For a sensor with a permalloy
ringcore of 1" in diameter the deviation from linearity is
measured to about 15 nTp-p in the earth's field and the
measurements are shown to fit well the calculations. Further, the
measurements and the calculations are also compared with a
calibration model of the fluxgate sensor onboard the "MAGSAT"
satellite. The later has a deviation from linearity of about 50
nTp-p but shows basically the same form of non-linearity as the
measurements.
| Original language | English |
|---|---|
| Journal | Sensors and Actuators A: Physical |
| Volume | 59 |
| Pages (from-to) | 70-74 |
| ISSN | 0924-4247 |
| Publication status | Published - 1997 |