A surveying system based on LabWindows/CVI for distributed slow-changing magnetic-field was proposed.The circuit structure of the magnetic picture sensors,measuring principle and multi-error correction technology were emphatically introduced.Based on the LabWindows/CVI,a virtual instrument control interface and flow diagram for the important program were provided.Finally,a group of pyromagnetic effect curves of PVC sheet with defects under extensional load leads to internal temperature gradient field and deformation field,and the magnetic-flux density distri...
