Patent ID: 9588189
Date: 2017-03-07
CPC Classifications: G01R

Claim:
1. A system of detecting magnetic field comprising: a magnetic impedance element surrounded by a detection coil; a stimulus unit generating signal of programmable rise/fall time to drive said magnetic impedance element; and a signal detection module detecting signal on said detection coil, wherein said signal detection module includes a buffer unit having adjustable bandwidth and shaping output signal of said detection coil; a signal amplify unit amplifying buffered signal from said buffer unit; a signal processing unit processing amplified signal from said signal amplify unit by applying a selectable algorithm to output detection result; and a control unit connecting said signal processing unit to generate control parameters of said stimulus unit, said buffer unit, said amplify unit, and said signal processing unit, said selectable algorithm being accomplished by digital signal filtering and said control parameters being optimized by sweeping a standard magnetic field, employing a delay circuit in said control unit to generate timing to sample a full signal waveform, confirming environment readiness of said sweeping, finding a new sampling edge if needed through comparing peak top and bottom values of the sampled signal waveform so as to tune said delay circuit, and optimizing system performance through changing said programmable rise/fall time in said stimulus unit, changing said adjustable bandwidth in said buffer unit, and selecting a digital signal filter for said digital signal filtering.