Through the flaw analysis of a winding distorting transformer,it gives the reasons of the distortion of winding,problems during the manufacturig,running and checking are presented.

Optimization for the circular coil of magnetic stimulation;

Aimed at drawback of low sensitivity of frequency divided method used in traditional vehicle detector,we present a novel inductive vehicle detector design method based on the basic operating principle of loop coil vehicle detector.

This paper introduces the theory of vehicle speed detection based on loop coil,analyzes the present speed estimation methods using the basic outputs of single loop detectors.