MAGNETIC SENSOR MODULE AND METHOD FOR DETERMINING OPERATION CONDITION OF MAGNETIC SENSOR MODULE

• Main Authors: KITABAYASHI MASATO, TAKEMIYA KOJI, YAMADA MASAKI, KATO MUNEHISA
• Format: Patent
• Language: English; Japanese
• Published: 06.09.2023
• Subjects: MEASURING; MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES; PHYSICS; TESTING

To enhance measurement sensitivity according to a state change of a cell.SOLUTION: A magnetic sensor module 1 comprises: a cell 2; a pump laser light source 4; a photodiode 13 for detecting intensity of pump light; a probe laser light source 5; a photodiode element 9a for detecting intensity of probe light; a differential amplifier 16 for generating a magnetism detection signal on the basis of the probe light passed through the cell 2; and a control circuit 17 that carries out at least one of first determination processing for determining a driving condition of the light source 4 on the basis of the intensity of the pump light as detected by the photodiode 13 while performing wavelength sweeping of the pump light by controlling the light source 4 and second determination processing for determining a driving condition of the light source 5 on the basis of the intensity of the probe light as detected by the photodiode element 9a while performing wavelength sweeping of the probe light by controlling the light source 5.SELECTED DRAWING: Figure 1 【課題】セルの状態変化に応じて計測感度を高めること。【解決手段】磁気センサモジュール１は、セル２と、ポンプレーザ光源４と、ポンプ光の強度を検出するフォトダイオード１３と、プローブレーザ光源５と、プローブ光の強度を検出するフォトダイオード素子９ａと、セル２を通過したプローブ光に基づいて磁気検出信号を生成する差動アンプ１６と、光源４を制御してポンプ光を波長掃引しながら、フォトダイオード１３によって検出されたポンプ光の強度を基に、光源４の駆動条件を決定する第１の決定処理と、光源５を制御してプローブ光を波長掃引しながら、フォトダイオード素子９ａによって検出されたプローブ光の強度を基に、光源５の駆動条件を決定する第２の決定処理と、の少なくともいずれか一方を行う制御回路１７と、を備える。【選択図】図１