ON THE CALIBRATION OF POSITION SENSORS BASED ON MAGNETIC DELAY-LINES

Results on the characteristics of three position sensors based on magn etic delay line techniques are illustrated in this paper. These sensor s are based on the linear motion of coils or magnets along the length of a magnetic delay line. The uncertainty of the first sensor has been improved up to 40 mu m m(-1) by applying bias field along its length, while the second cordless sensor has the worst accuracy of 100 mu m m (-1). The sensitivity of the third position sensor has been determined to be better than 1 mu m, provided that it is firmly shielded against ambient magnetic fields. The simplicity of these arrangements makes t hem interesting for industrial applications, where corded or cordless linear motion position sensors of relatively low cost are required. (C ) 1997 Elsevier Science S.A.