JPWO2013150926A1 - 磁場計測装置 - Google Patents
磁場計測装置 Download PDFInfo
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R33/00—Arrangements or instruments for measuring magnetic variables
- G01R33/20—Arrangements or instruments for measuring magnetic variables involving magnetic resonance
- G01R33/24—Arrangements or instruments for measuring magnetic variables involving magnetic resonance for measuring direction or magnitude of magnetic fields or magnetic flux
- G01R33/26—Arrangements or instruments for measuring magnetic variables involving magnetic resonance for measuring direction or magnitude of magnetic fields or magnetic flux using optical pumping
Abstract
Description
λ=2dsinθ ・・・(数1)
で決定される。ここで、dは回折格子のピッチを、θは回折角を表す。回折格子の角度調整は、回折格子もしくは回折格子にレーザー光を導くミラーに取り付けられた圧電素子によって行う。さらに、温度変化によるレーザー発振周波数のドリフトを最小限に抑えるために、半導体レーザー素子の近傍に配置したサーミスターで温度をモニターし、半導体レーザー素子のマウント下に設置したペルチェ素子で温度安定化を行う。
献3(Appl. Opt.37 (1998) 3295)に示されるゼーマン分裂生じさせたアルカリ金属蒸気に対する右円偏光と左円偏光の差分信号を用いた周波数安定化方法(Dichroic-Atomic-Vapor-Laser-Lock)などの手法を用いてもよい。上記記載の光ポンピング磁気センサーの動作に必要なレーザー条件を満たせば、レーザー素子の制御温度とレーザー素子への注入電流の調整のみの最もシンプルな周波数安定化も使用できる。また、上記説明でレーザーとして安価かつコンパクトな構成を考慮して半導体レーザーを述べたが、使用する磁気センサー用ガラスセル126内のアルカリ金属の吸収波長を含めば半導体レーザー以外のレーザーでもあっても使用できる。実際に高い周波数安定度は外部共振器型半導体レーザーが得られやすいが、半導体内部に回折格子機構を搭載した分布帰還型半導体レーザーは音響ノイズや振動ノイズに強い構造であるため、実用面でより使いやすい。
101 レーザー制御回路
102 周波数安定化制御部
103 光強度調節部
104 偏波調節部
105 光源部
106 偏波保持光ファイバー
107 光検出器を内蔵した磁気センサー部
108 コイル部
109 静磁場コイル
110 RFコイル
111 磁気シールド
112 信号制御処理部
113 カレントアンプ回路
114 アンプフィルタ回路
115 位相検波回路
116 AD変換回路
117 PC
118 安定化電源
119 ループフィルタ回路
120 発振回路
121 電磁シールド線
122、152 非磁性ファイバーコネクタ
123 コリメートレンズ
124 偏光子
125 λ/4波長板
126 ガラスセル
127 集光レンズ128 光検出器
129 非磁性筐体
130 マルチモード光ファイバー
131 光検出器を内蔵していない磁気センサー部
132 光検出器装備の信号制御処理部
133 マルチモード光ファイバー接続用光検出器
134 保温機構を備えた磁気センサー部
135 温水用流入口
136 温水用流出口
137 温水流入接続部
138、139 温水用チャンバー
140 恒温水循環装置
141、142 断熱チューブ
143 保温機構を備えた磁気センサー部
Claims (4)
- アルカリ金属ガスが封入されたガラスセルを有し、スピン偏極したアルカリ金属の磁気光学特性を利用して磁場を検出する磁気センサー部と、
前記磁気センサー部に導入する周波数安定化した励起光を発生する光源部と、
前記磁気センサー部と同一の磁気シールド空間に設けられ、前記磁気センサー部に静磁場及びRF磁場を印加するコイル部と、
前記磁気センサー部のガラスセルを透過した光の検出信号をロックイン検波し、そのロックイン検波出力により前記コイル部から発生する前記静磁場の強度と前記RF磁場の周波数を制御するとともに、前記磁気シールド空間に設置された計測対象の磁場強度を反映した計測信号を得る信号処理装置を有し、
前記磁気センサー部は、前記光源部からの前記周波数安定化した励起光が偏波保持光ファイバーを介して導入されるコリメートレンズと、前記コリメートレンズを通した励起光を前記ガラスセルに伝達する偏光光学素子と、前記ガラスセルとが被磁性筐体に一体で収められて成ることを特徴とする磁場計測装置。 - 前記磁気センサー部は、前記ガラスセルを透過した光量を検出して電気信号を発する光検出素子を更に有し、当該光検出素子は前記非磁性筐体の中に収められることを特徴とする請求項1に記載の磁場計測装置。
- 前記磁気センサー部は、前記ガラスセルを透過した光を集光してマルチモード光ファイバーの端面に集光するように前記非磁性筐体の中に収められた集光レンズを更に有し、前記磁気シールドの外部に設けた光検出器に前記マルチモード光ファイバーを介して光を伝達するように構成したことを特徴とする請求項1に記載の磁場計測装置。
- 請求項1乃至3何れかに記載の磁場計測装置において、前記磁気センサー部のガラスセルの励起光が通過しない側面に温水を循環させる保温機構を更に有する事を特徴とする磁場計測装置。
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JP2012086954 | 2012-04-06 | ||
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