Danisense DCCT Ultra-Precision DC Current Sensors: How They Work
A fluxgate works by using an excited coil of soft magnetic material as the probe; saturation/desaturation cycling and signal processing let the coil measure the magnetic field proportionally. This opens up several current-sensor designs: it can simply replace an air-gap Hall probe, and the coil can take a split form.
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MRI: High-Precision DC Measurement
In an MRI system the gradient amplifier comprises all circuitry associated with the gradient magnetic field. It supplies a fast-switching gradient field with the required linearity, determining slice position and thickness; gradient-coil linearity is the yardstick of field uniformity.
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PPM-Level Current Accuracy with Fluxgate Sensors
A fluxgate sensor measures weak magnetic fields through the nonlinear B-H relationship of a high-permeability core driven into saturation by an alternating field. The core acts as a 'gate' through which the flux is modulated, inducing a voltage. Measuring the field produced by a current gives an indirect current measurement.
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