研究目的
Describing recent technological progress in the field of high accuracy fluxgate current transducers, including innovative waveforms for fluxgate excitation and their digital signal processing.
研究成果
The innovations described, including digital signal processing and a ripple compensation coil, result in a transducer with very high accuracy and low noise over a wide temperature range. After calibration, the remaining peak-to-peak ripple is less than 50 ppm, relative to the full scale transducer output, over the full -40 °C to 85 °C operating temperature range.
研究不足
The voltage drive which excites the fluxgate may couple into the secondary current and add an unwanted signal, or ripple, at the excitation frequency. The electronics in the control loop is quite complex and if implemented in the analog domain, there are many blocks which have the potential to contribute offset, noise from the supplies, and so on.
