MAGNETIC FIELD MEASURING INSTRUMENT AND MAGNETIC FIELD MEASURING METHOD

• Main Authors: MIZUOCHI NORIKAZU, YOSHII YOSHIHARU
• Format: Patent
• Language: English; Japanese
• Published: 16.01.2020
• Subjects: INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIRCHEMICAL OR PHYSICAL PROPERTIES; MEASURING; MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES; PHYSICS; TESTING

To provide a magnetic field measuring instrument and a magnetic field measuring method which utilize ODMR to accurately measure a low-frequency AC magnetic field.SOLUTION: A coil 2 applies a microwave magnetic field to an optically detected magnetic resonance member 1 disposed within an AC magnetic field to be measured. A high-frequency power source 3 causes a microwave current to flow to the coil 2. An irradiator 4 irradiates the optically detected magnetic resonance member 1 with light. A light receiver 5 detects light emitted from the optically detected magnetic resonance member 1. Then, a measurement controller 21 executes a prescribed DC magnetic field measurement sequence for a prescribed phase of the AC magnetic field to be measured and controls the high-frequency power source 3 and the irradiator 4 in the DC magnetic field measurement sequence to specify an amount of detected light detected by the light receiver 5. A magnetic field calculator 22 calculates an intensity of the AC magnetic field to be measured on the basis of the prescribed phase and the amount of detected light.SELECTED DRAWING: Figure 1 【課題】 ＯＤＭＲを利用して低周波の交流磁場を正確に測定する磁場測定装置および磁場測定方法を得る。【解決手段】 コイル２は、被測定交流磁場内に配置される光検出磁気共鳴部材１にマイクロ波の磁場を印加する。高周波電源３は、コイル２にマイクロ波の電流を導通させる。照射装置４は、光検出磁気共鳴部材１に光を照射する。受光装置５は、光検出磁気共鳴部材１から発せられる光を検出する。そして、測定制御部２１は、被測定交流磁場の所定位相に対する所定の直流磁場測定シーケンスを実行し、その直流磁場測定シーケンスにおいて、高周波電源３および照射装置４を制御し、受光装置５により検出された光の検出光量を特定する。磁場演算部２２は、その所定位相および検出光量に基づいて、被測定交流磁場の強度を演算する。【選択図】 図１