We use the magnetic control sensor,which composed by dry reed pipe and magnetic floater,to achieve this function.

In order to solve the problem of the mechanical arc sensor for seam-tracking,a new type of magnetic-control arc sensor was developed,and its mechanical structure and the correlative circuit diagram were given.

Aimed at some problems of the mechanical arc sensor for seam-tracking,the magnetic-control welding arc technology is applied to seam tracleking,a new type magnetic-control arc sensor and a system structure with two sets of crossed slides are designed.

In order to solve some problems of the sensor for seam-tracking,applied the magnetic-control welding arc technology,developed a new type magnetic-control arc sensor,it s basic principle was analyzed,and mathematic model was built,the main parameters were analyzed,that provided academic foundation for the application of the magnetic-control arc sensor.

Reasons of imaging excursion of two rotating mirror high speed cameras used simultaneously are discussed,and the influence to images are analysed according to the theories and experiments,such as the signal drift of the magnetoelectric sensor and improperly operating etc.

This paper introduces the differential connecting temperature compensation magnetoelastic transducer, a temperature compensating method that can greatly improve the measure precision, i, e, a self correcting method,Kegwords: magneto-elastic transduce, temperature compensation, self correction