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Table 6

Suitable CPP operating ranges that guarantee the best performance of the device.

Code Critical Process Parameters (CPP) Suitable operating ranges Prototype device
CPP1 Primary magnetic field frequency 6.7–10.9 kHz 7.7 Hz
CPP2 Current intensity (solenoid excitation) 1.6–2.09 mA 1.8–2.0 mA
CPP3 Current intensity (circuit) 129.3–387.9 mA ∼100 mA
CPP4 Circuit supply voltage (V) ±15 V
CPP5 Sensor sensitivity (mV/nT) 5 mV/nT
CPP6 Solenoid dimensions (N/L* ratio) 505–1 000 turns/m ∼514.3 turns/m
CPP7 GMI supply voltage (V) 15 V
CPP8 Oscillator supply voltage (V) ∼5 V
CPP9 Sensor characteristics (intrinsic noise) (fT/√Hz) 10 fT/√Hz
CPP10 AC in the GMI sensor (intensity) (mA) ∼15 mA
CPP11 AC frequency of the current in the sensor (oscillator frequency) (MHz) 1 MHz
CPP12 Sensor size (length) (cm) 1.35 cm
CPP13 Heterogeneity of sensors (difference in sensitivity) (%) <1 %
CPP14 Gradiometer baseline 3.8–7.2 cm ∼5.65 cm
CPP17 Superposition of baseline lengths between sensor centers and solenoid axis (% of solenoid's length) up to 6.6 % cm up to 2 % cm
CPP18 Circuit noise (intrinsic noise) up to 37.4 pT 25 pT
CPP19 Filter (order) fourth-order

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