Stroboscopic Technique for Measuring Magnetic-Field Waveforms Utilizing Magneto-Optical Effect

• Published in: IEEE transactions on magnetics 2011-10, Vol.47 (10), p.4011-4013
• Main Authors: Nasuno, Hiroshi, Hashi, Shuichiro, Ishiyama, Kazushi
• Format: Article
• Language: English
• Subjects: Cross-disciplinary physics: materials science; rheology; Electromagnetic compatibility; Exact sciences and technology; Frequency measurement; Magnetic noise; Magnetic resonance imaging; Magnetic shielding; magnetic-field measurement; magneto-optical effect; Materials science; Measurement by laser beam; Other topics in materials science; Phase measurement; Physics; Transmission line measurements
• ISSN: 0018-9464; 1941-0069
• DOI: 10.1109/TMAG.2011.2147775

Electromagnetic interference (EMI) is a serious problem in integrated circuits (ICs). Many methods for measuring EMI have been developed. These methods generally use metal probes to measure electromagnetic waves; however, metal probes alter the electromagnetic field. Furthermore, measurement techniques that have very high time resolutions are required because of the high operating frequencies of ICs. Measurements that use the magneto-optical effect can overcome both these problems. Magneto-optical materials affect electromagnetic waves less than metal probes and optical measurements are advantageous for minimally invasive measurements of magnetic fields. To achieve a high resolution, we developed a stroboscopic method that employs short laser pulses. This method can measure a magnetic field in any phase because the laser pulses are synchronized with the magnetic field. Measurements of magnetic-field waveforms demonstrated that this stroboscopic method is effective for measuring magnetic-field waveforms.