基于高温DC-SQUID弱磁场探测系统设计

Firstly, based on DC-SQUID the principle of detection of weak magnetic field was described in this paper; Lock-in amplifier and other circuits were introduced, by using the coupled coil after through the lock-in amplifier and other circuits, weak magnetic field signal was converted to a high SNR voltage signal; Then sent to PC to process through data acquisition card; Besides, in this paper, data acquisition and processing Procedures were programmed based on LabVIEW, the voltage waveform and weak magnetic variation were showed; The simulation proves the feasibility and accuracy of the system..