A three‐dimensional magnetic field mapping system for deflection yoke of cathode‐ray tube

Abstract

In this paper, we introduce an efficient three-dimensional magnetic field mapping system for a Deflection Yoke (DY) in Cathode-Ray Tube (CRT). A three-axis Hall probe mounted in a small cylindrical bar and three-stepping motors placed in a non-magnetic frame were utilized for the mapping. Prior to the mapping starts, the inner contour of DY was measured by a laser sensor to make a look-up table for inner shape of DY. Three-axis magnetic fields are then digitized by a threedimensional Hall probe. The results of the mapping can be transformed into various output formats such as multipole harmonics of magnetic fields. Field shape in one, two and three-dimensional spaces can also be displayed. In this paper, we present the features of this mapping device and some analysis results.

Design of the Stable Homogeneous Magnetic Field Calibration Device Generated by the Circular Coils

“…The Earth's magnetic field can be utilized to locate and control satellites [6]- [8]. The cathode ray tubes are used in many applications such as televisions, computer monitors, and oscilloscopes, where the coils are used for the magnetic deflection of electrons in cathode ray tubes [9]- [11].…”