Current-output mode of PCB fluxgate sensors is presented. As the short-circuited output current sensitivity is inversely proportional to the number of turns of the pickup coil, PCB fluxgates should perform well in this mode. In order to avoid serial tuning of the sensor's output, sufficiently large series capacitor must be used mainly for pickup-coils with very low impedance. The sensitivities (with sinewave excitation and 2nd harmonic detection) have been found as 32 and 86 A/T for sensor IIIA and IIB, respectively. The noise values remain the same as in the voltage mode; however the linearity of the uncompensated sensor shows differences from the voltage mode. Sensor IIB with pickup-coil covering only one third of racetrack length (centred) showed improvement from 0.5% linearity error in voltage mode to 0.23% in the current-output mode. Sensor IIIA with long pickup-coil covering also the core ends has good linearity in the voltage mode (0.3%), however in the current-output regime it was worsened down to 3.5% nonlinearity of 100 T full-scale.
The growing interest and activity in the field of sensor technologies requires a forum for rapid dissemination of important results: Sensor Letters is that forum. Sensor Letters offers scientists, engineers and medical experts timely, peer-reviewed research on sensor science and technology of the highest quality. Sensor Letters publish original rapid communications, full papers and timely state-of-the-art reviews encompassing the fundamental and applied research on sensor science and technology in all fields of science, engineering, and medicine. Highest priority will be given to short communications reporting important new scientific and technological findings.