Ultra-low DC Magnetic Field Detection Using Ceramic Superconductors

Design and performance analysis of three superconducting magnetic sensors for the measurement of small fields

“…The magnetic measurements were carried out on samples having a slab geometry to ignore the contribution of the demagnetization factor to the parameters, such as H c1J and H * . The experimental set-up for the second harmonic measurements was described in detail in [16]. The coil configurations (pick-up and excitation coils) are shown in figure 1.…”

“…The influence of inherent properties of superconducting (SC) cores (such as T c , the transition width, critical field, grain couplings and relative permeability of the SC cores) on the sensor performance has not been investigated. In our recent study many different parameters, such as the coil configuration, environmental conditions, sensor geometry and the strength of grain couplings, have been improved and the effects of those parameters on the sensor's sensitivity have been reported [16][17][18]. As a result of these experiments we, for instance, reached a judgment that stronger grain couplings provide a better dcfield sensitivity down to 1 nT.…”

Measurements of ultra-low DC fields by high- T c superconducting cores: The effect of calcination temperature

“…[12,13] in detail. YBa2Cu3O7−x (Y-123) ceramic superconductors, used as sensing elements, were prepared by the solid state reaction method.…”

“…[13]). The DC-field was applied by a calibrated solenoid with coil constant of 15.61 Oe/A, which is traceable to primary standards of dimensional and time and frequency over NMR teslameter.…”