JP2015212715A - Magnetic field measurement device, magnetic field measurement system, and magnetic field measurement method - Google Patents

Magnetic field measurement device, magnetic field measurement system, and magnetic field measurement method Download PDF

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JP2015212715A
JP2015212715A JP2015167070A JP2015167070A JP2015212715A JP 2015212715 A JP2015212715 A JP 2015212715A JP 2015167070 A JP2015167070 A JP 2015167070A JP 2015167070 A JP2015167070 A JP 2015167070A JP 2015212715 A JP2015212715 A JP 2015212715A
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gas cell
magnetic field
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龍治 保刈
Ryuji Hokari
龍治 保刈
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Seiko Epson Corp
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PROBLEM TO BE SOLVED: To measure magnetic fields of objects to be measured without being influenced by disturbance exceeding a range that a measurement part which irradiates gas cells to measure their magnetic fields can measure even when there is the disturbance to the measurement part.SOLUTION: A magnetic field measurement device includes: a first gas cell 10 arranged in the +z direction viewed from an object 50 to be measured; a second gas cell 20 arranged in the +z direction viewed from the first gas cell 10; a first measurement part 11 which emits light to measure a component in the +z direction of a magnetic field in the first gas cell 10; a second measurement part 21 which emits light to measure a component in the +z direction of a magnetic field in the second gas cell 20; magnetic field generation means (coils 31, 32) for sandwiching the object 50 to be measured, the first gas cell 10, the second gas cell 20 along the +z direction to generate a magnetic field toward the second gas cell 20 so that the component measured by the second measurement part 21 becomes small; and an output part 40 which outputs a signal according to difference in the components measured by the first measurement part 11 and the second measurement part 21, respectively.

Description

本発明は、磁場測定装置、磁場測定システムおよび磁場測定方法の技術に関する。   The present invention relates to a magnetic field measurement apparatus, a magnetic field measurement system, and a magnetic field measurement method.

光ポンピングを利用した磁気センサーが、生体内から発生する磁場を測定する磁場測定装置などに用いられている。この磁気センサーは、アルカリ金属などの原子を気体の状態で封入したセルを有する。このセルに対して、円偏光成分を有するポンプ光を照射すると、封入された原子が励起する。そして、このポンプ光に交差するように、直線偏光成分を有するプローブ光を照射すると、励起した原子は、外部から印加された磁場に応じてそのプローブ光に含まれる直線偏光の偏光面を回転させる。磁気センサーは、このセルを透過したプローブ光の偏光面の回転角を計測することで、磁場を測定する。   A magnetic sensor using optical pumping is used in a magnetic field measuring apparatus that measures a magnetic field generated from a living body. This magnetic sensor has a cell in which atoms such as alkali metals are enclosed in a gaseous state. When this cell is irradiated with pump light having a circularly polarized component, the encapsulated atoms are excited. When the probe light having a linearly polarized component is irradiated so as to intersect the pump light, the excited atoms rotate the polarization plane of the linearly polarized light included in the probe light in accordance with the magnetic field applied from the outside. . The magnetic sensor measures the magnetic field by measuring the rotation angle of the polarization plane of the probe light transmitted through the cell.

ところで、特に生体内から発生する磁場のように微弱な磁場を磁場測定装置により測定する場合、生体外部の磁場が測定に影響することが問題となる。
外部の磁場をキャンセルする技術として、特許文献１〜３には、磁場センサーを用いて測定した磁場の量を基に外乱磁場を推測してキャンセルする技術が記載されている。また特許文献４、５には、複数のコイルを用いてそれらの勾配磁場成分を測定することで、ノイズとなる測定対象外の磁場の影響をキャンセルするグラジオ型の磁気センサーが記載されている。 By the way, in particular, when measuring a weak magnetic field such as a magnetic field generated in a living body with a magnetic field measuring apparatus, a problem arises that the magnetic field outside the living body affects the measurement.
As techniques for canceling an external magnetic field, Patent Documents 1 to 3 describe techniques for estimating and canceling a disturbance magnetic field based on the amount of a magnetic field measured using a magnetic field sensor. Patent Documents 4 and 5 describe a gradio-type magnetic sensor that cancels the influence of a magnetic field outside the measurement target that becomes noise by measuring the gradient magnetic field components using a plurality of coils.

特開２００８−２８２９８３号公報JP 2008-282893 A 特開２００３−３３２７８１号公報JP 2003-332781 A 特開２０００−３２９８３６号公報JP 2000-329836 A 特開２００７−１７０８８０号公報JP 2007-170880 A 特開２００１−５１０３５号公報JP 2001-51035 A

本発明は、ガスセルに光を照射してそのガスセルにおける磁場の予め決められた方向の成分を測定する測定部に対し、その測定部が測定可能な範囲を超えた外乱がある場合でも、その外乱に影響されずに被測定物の磁場を測定することを目的とする。   The present invention relates to a measurement unit that irradiates light to a gas cell and measures a component in a predetermined direction of a magnetic field in the gas cell, even if there is a disturbance that exceeds the range that the measurement unit can measure. The object is to measure the magnetic field of the object to be measured without being affected by the above.

本発明に係るひとつの磁場測定装置は、被測定物が設置される位置に対して第１方向に配置された第１ガスセルと、前記第１ガスセルに対して前記第１方向に設置された第２ガスセルと、前記第１ガスセルを通過した第１の光を用いて磁場の前記第１方向の成分を測定する第１測定部と、前記第２ガスセルを通過した第２の光を用いて磁場の前記第１方向の成分を測定する第２測定部と、前記被測定物、前記第１ガスセル、および前記第２ガスセルを、前記第１方向において挟むように対向して配置された一対の磁場発生部と、前記第１測定部及び前記第２測定部における前記第１方向の成分の測定結果を基にして生成された所定の信号を出力する出力部と、を含み、前記磁場発生部は、前記第２の測定部で計測される前記第１方向の成分の測定値が、小さくなる磁場を前記第２ガスセルに向けて発生させることを特徴とする。
本発明に係るひとつの磁場測定システムは、上記のひとつの磁場測定装置を、互いに異なる方向ごとに複数備えることが好ましい。
上記のひとつの磁場測定システムにおいて、前記互いに異なる方向は、前記第１方向に平行な方向と前記第１方向に直角に交わる方向であるが好ましい。
本発明に係るひとつの磁場測定方法は、第１測定部が、被測定物の設置される位置からみて予め決められた第１方向に配置された第１ガスセルに光を照射して、当該第１ガスセルにおける磁場の前記第１方向の成分を測定し、第２測定部が、前記第１ガスセルからみて前記第１方向に配置された第２ガスセルに光を照射して、当該第２ガスセルにおける磁場の前記第１方向の成分を測定し、磁場発生手段が、前記被測定物、前記第１ガスセル、および前記第２ガスセルを前記第１方向に沿って挟み、前記第２測定部により測定された前記第１方向の成分が小さくなるように、前記第２ガスセルに向けて磁場を発生させ、出力部が、前記第１測定部と前記第２測定部とがそれぞれ測定した前記第１方向の成分の差に応じた信号を出力することを特徴とする。
本発明は、被測定物が設置される位置からみて予め決められた方向に配置された第１ガスセルと、前記第１ガスセルからみて前記方向に配置された第２ガスセルと、前記第１ガスセルに光を照射して、当該第１ガスセルにおける磁場の前記方向の成分を測定する第１測定部と、前記第２ガスセルに光を照射して、当該第２ガスセルにおける磁場の前記方向の成分を測定する第２測定部と、前記被測定物、前記第１ガスセル、および前記第２ガスセルを前記方向に沿って挟み、前記第２測定部により測定された前記成分が小さくなるように、前記第２ガスセルに向けて磁場を発生させる磁場発生手段と、前記第１測定部と前記第２測定部とがそれぞれ測定した前記成分の差に応じた信号を出力する出力部とを備えることを特徴とする磁場測定装置を提供する。この構成によれば、ガスセルに光を照射してそのガスセルにおける磁場の予め決められた方向の成分を測定する測定部に対し、その測定部が測定可能な範囲を超えた外乱がある場合でも、その外乱に影響されずに被測定物の磁場を測定することができる。 One magnetic field measurement apparatus according to the present invention includes a first gas cell disposed in a first direction with respect to a position where an object to be measured is disposed, and a first gas cell disposed in the first direction with respect to the first gas cell. A two-gas cell, a first measurement unit that measures a component of the magnetic field in the first direction using the first light that has passed through the first gas cell, and a magnetic field that uses the second light that has passed through the second gas cell. A pair of magnetic fields disposed opposite to each other so as to sandwich the second object to be measured, the first gas cell, and the second gas cell in the first direction. A generating unit; and an output unit that outputs a predetermined signal generated based on a measurement result of the component in the first direction in the first measuring unit and the second measuring unit, and the magnetic field generating unit includes: , Component of the first direction measured by the second measuring unit Value is, the smaller the magnetic field and wherein the generating toward the second gas cell.
One magnetic field measurement system according to the present invention preferably includes a plurality of the single magnetic field measurement devices in different directions.
In the one magnetic field measurement system, the different directions are preferably a direction parallel to the first direction and a direction perpendicular to the first direction.
In one magnetic field measurement method according to the present invention, the first measurement unit irradiates light to the first gas cell arranged in the first direction determined in advance from the position where the object to be measured is installed. The component in the first direction of the magnetic field in one gas cell is measured, and the second measurement unit irradiates light to the second gas cell arranged in the first direction as viewed from the first gas cell, and in the second gas cell A component of the magnetic field in the first direction is measured, and the magnetic field generation unit sandwiches the object to be measured, the first gas cell, and the second gas cell along the first direction, and is measured by the second measurement unit. In addition, a magnetic field is generated toward the second gas cell so that the component in the first direction becomes small, and the output unit measures the first direction measured by the first measurement unit and the second measurement unit, respectively. To output a signal corresponding to the difference in components. And butterflies.
The present invention provides a first gas cell disposed in a predetermined direction as viewed from a position where an object to be measured is installed, a second gas cell disposed in the direction as viewed from the first gas cell, and the first gas cell. A first measurement unit that irradiates light and measures the component in the direction of the magnetic field in the first gas cell; and irradiates the second gas cell with light and measures the component in the direction of the magnetic field in the second gas cell. The second measurement unit, the object to be measured, the first gas cell, and the second gas cell are sandwiched along the direction so that the component measured by the second measurement unit is small. Magnetic field generating means for generating a magnetic field toward the gas cell, and an output unit that outputs a signal corresponding to the difference between the components measured by the first measuring unit and the second measuring unit, respectively. Magnetic field measurement equipment To provide. According to this configuration, for a measurement unit that irradiates light to a gas cell and measures a component in a predetermined direction of the magnetic field in the gas cell, even when there is a disturbance that exceeds the range that the measurement unit can measure, The magnetic field of the object to be measured can be measured without being affected by the disturbance.

また本発明は、上述の磁場測定装置を、互いに異なる前記方向ごとに複数備えることを特徴とする磁場測定システムを提供する。この構成によれば、上述の外乱がある場合でも、その外乱に影響されずに被測定物の磁場の複数方向の成分を測定することができる。
また本発明は、上述の磁場測定システムにおいて、前記複数の方向は、互いに直角に交わる方向であることを特徴とする磁場測定システムを提供する。この構成によれば、上述の外乱がある場合でも、その外乱に影響されずに被測定物の磁場の直交座標系における各成分を測定することができる。
また本発明は、被測定物の設置される位置からみて予め決められた方向に配置された、第１測定部が、第１ガスセルに光を照射して、当該第１ガスセルにおける磁場の前記方向の成分を測定し、第２測定部が、前記第１ガスセルからみて前記方向に配置された第２ガスセルに光を照射して、当該第２ガスセルにおける磁場の前記方向の成分を測定し、磁場発生手段が、前記被測定物、前記第１ガスセル、および前記第２ガスセルを前記方向に沿って挟み、前記第２測定部により測定された前記成分が小さくなるように、前記第２ガスセルに向けて磁場を発生させ、出力部が、前記第１測定部と前記第２測定部とがそれぞれ測定した前記成分の差に応じた信号を出力することを特徴とする磁場測定方法を提供する。この構成によれば、ガスセルに光を照射してそのガスセルにおける磁場の予め決められた方向の成分を測定する測定部に対し、その測定部が測定可能な範囲を超えた外乱がある場合でも、その外乱に影響されずに被測定物の磁場を測定することができる。 The present invention also provides a magnetic field measurement system comprising a plurality of the magnetic field measurement devices described above in different directions. According to this configuration, even when there is the above-described disturbance, it is possible to measure components in a plurality of directions of the magnetic field of the object to be measured without being affected by the disturbance.
The present invention also provides the magnetic field measurement system according to the magnetic field measurement system, wherein the plurality of directions intersect each other at right angles. According to this configuration, even when there is the above-described disturbance, each component in the orthogonal coordinate system of the magnetic field of the object to be measured can be measured without being affected by the disturbance.
In the present invention, the first measurement unit arranged in a predetermined direction as viewed from the position where the object to be measured is installed irradiates the first gas cell with light, and the direction of the magnetic field in the first gas cell is determined. The second measurement unit irradiates light to the second gas cell arranged in the direction as viewed from the first gas cell, measures the component in the direction of the magnetic field in the second gas cell, and The generation means sandwiches the object to be measured, the first gas cell, and the second gas cell along the direction, and directs the component to the second gas cell so that the component measured by the second measurement unit becomes small. A magnetic field is generated, and the output unit outputs a signal corresponding to the difference between the components measured by the first measurement unit and the second measurement unit, respectively. According to this configuration, for a measurement unit that irradiates light to a gas cell and measures a component in a predetermined direction of the magnetic field in the gas cell, even when there is a disturbance that exceeds the range that the measurement unit can measure, The magnetic field of the object to be measured can be measured without being affected by the disturbance.

本発明の実施形態に係る磁場測定装置の概要を示すブロック図である。It is a block diagram which shows the outline | summary of the magnetic field measuring apparatus which concerns on embodiment of this invention. 本発明の実施形態に係る磁場測定装置における構成要素の配置を示す図である。It is a figure which shows arrangement | positioning of the component in the magnetic field measuring apparatus which concerns on embodiment of this invention. 磁場測定装置を２つ備えた磁場測定システムの構成要素の配置を示す図である。It is a figure which shows arrangement | positioning of the component of the magnetic field measurement system provided with two magnetic field measurement apparatuses.

図１は、本発明の実施形態に係る磁場測定装置９０の概要を示すブロック図である。図２は、本発明の実施形態に係る磁場測定装置９０における構成要素の配置を示す図である。磁場測定装置９０の各構成の配置などを説明するため、磁場測定装置９０が配置される空間をｘｙｚ右手系座標空間として表す。この座標空間においてｘ成分が増加する方向を＋ｘ方向といい、ｘ成分が減少する方向を−ｘ方向という。同様に、ｙ、ｚ成分についても、＋ｙ方向、−ｙ方向、＋ｚ方向、−ｚ方向を定義する。   FIG. 1 is a block diagram showing an outline of a magnetic field measuring apparatus 90 according to an embodiment of the present invention. FIG. 2 is a diagram showing the arrangement of components in the magnetic field measurement apparatus 90 according to the embodiment of the present invention. In order to describe the arrangement of the components of the magnetic field measurement device 90, the space in which the magnetic field measurement device 90 is arranged is represented as an xyz right-handed coordinate space. The direction in which the x component increases in this coordinate space is referred to as the + x direction, and the direction in which the x component decreases is referred to as the −x direction. Similarly, for the y and z components, + y direction, -y direction, + z direction, and -z direction are defined.

図１に示す破線の枠内は、磁場測定装置９０を示している。この磁場測定装置９０は、第１ガスセル１０、第１測定部１１、第２ガスセル２０、第２測定部２１、コイル３１、３２、コントローラー３３、および出力部４０を備える。   A magnetic field measuring device 90 is shown in a broken-line frame shown in FIG. The magnetic field measurement apparatus 90 includes a first gas cell 10, a first measurement unit 11, a second gas cell 20, a second measurement unit 21, coils 31 and 32, a controller 33, and an output unit 40.

被測定物５０は、磁場の測定対象となる物体であり、例えば人体である。第１ガスセル１０および第２ガスセル２０は、いずれも、ガラスなどの透明部材によって仕切られた内部空間にアルカリ金属原子などのガスを封入したセルである。   The DUT 50 is an object to be measured for a magnetic field, for example, a human body. Each of the first gas cell 10 and the second gas cell 20 is a cell in which a gas such as an alkali metal atom is sealed in an internal space partitioned by a transparent member such as glass.

図２に示すように、第１ガスセル１０は、被測定物５０が設置される位置からみて予め決められた方向である＋ｚ方向に配置される。第２ガスセル２０は、第１ガスセル１０からみて予め決められた方向である＋ｚ方向に配置される。すなわち、これらは、＋ｚ方向に沿って、被測定物５０→第１ガスセル１０→第２ガスセル２０の順に並べられている。したがって第１ガスセル１０は、被測定物が設置される位置からみて予め決められた方向に配置された第１ガスセルの一例である。また第２ガスセル２０は、第１ガスセルからみて予め決められた方向に配置された第２ガスセルの一例である。   As shown in FIG. 2, the first gas cell 10 is arranged in the + z direction, which is a predetermined direction when viewed from the position where the DUT 50 is installed. The second gas cell 20 is arranged in the + z direction, which is a predetermined direction when viewed from the first gas cell 10. That is, they are arranged in the order of the device under test 50 → the first gas cell 10 → the second gas cell 20 along the + z direction. Therefore, the first gas cell 10 is an example of a first gas cell arranged in a predetermined direction as viewed from the position where the object to be measured is installed. The second gas cell 20 is an example of a second gas cell disposed in a predetermined direction as viewed from the first gas cell.

第１測定部１１は、第１ガスセル１０に向けて円偏光成分を有するポンプ光と、直線偏光成分を有するプローブ光とをそれぞれ照射する照射部と、第１ガスセル１０を透過したプローブ光を検出する検出部を備える。照射部は、ポンプ光とプローブ光とを互いに交差するように、望ましくは直交するように照射する。検出部は、検出したプローブ光のうち、直線偏光成分を抽出して、その偏光面が第１ガスセル１０を経て回転させられた角度を特定し、その角度に基づいて第１ガスセル１０における磁場の＋ｚ方向の成分を測定する。したがって第１測定部１１は、第１ガスセルに光を照射して、第１ガスセルにおける磁場の予め決められた方向の成分を測定する第１測定部の一例である。   The first measurement unit 11 detects an irradiation unit that irradiates pump light having a circularly polarized component and probe light having a linearly polarized component toward the first gas cell 10, and probe light that has passed through the first gas cell 10. The detection part to perform is provided. The irradiating unit irradiates the pump light and the probe light so as to cross each other, preferably orthogonally. The detection unit extracts a linearly polarized light component from the detected probe light, specifies an angle at which the polarization plane is rotated through the first gas cell 10, and based on the angle, the magnetic field in the first gas cell 10 is detected. The component in the + z direction is measured. Therefore, the 1st measurement part 11 is an example of the 1st measurement part which irradiates light to a 1st gas cell and measures the component of the predetermined direction of the magnetic field in a 1st gas cell.

第２測定部２１は、第１ガスセル１０に対する第１測定部１１の構成と共通する構成を、第２ガスセル２０に対する構成として備えており、第１測定部１１と同様に、第２ガスセル２０における磁場の＋ｚ方向の成分を測定する。したがって第２測定部２１は、第２ガスセルに光を照射して、第２ガスセルにおける磁場の予め決められた方向の成分を測定する第２測定部の一例である。   The second measurement unit 21 includes a configuration common to the configuration of the first measurement unit 11 for the first gas cell 10 as a configuration for the second gas cell 20, and similarly to the first measurement unit 11, The component in the + z direction of the magnetic field is measured. Therefore, the second measurement unit 21 is an example of a second measurement unit that irradiates the second gas cell with light and measures a component in a predetermined direction of the magnetic field in the second gas cell.

図２に示す配置では、第１ガスセル１０からみて−ｘ方向からその第１ガスセル１０に向けてポンプ光Ｌａ１が照射され、第２ガスセル２０からみて−ｘ方向からその第２ガスセル２０に向けてポンプ光Ｌａ２が照射される。これらポンプ光により、第１ガスセル１０および第２ガスセル２０に封入されたアルカリ金属などの原子は励起する。   In the arrangement shown in FIG. 2, the pump light La <b> 1 is irradiated from the −x direction toward the first gas cell 10 as viewed from the first gas cell 10, and from the −x direction toward the second gas cell 20 as viewed from the second gas cell 20. Pump light La2 is irradiated. By these pump lights, atoms such as alkali metals enclosed in the first gas cell 10 and the second gas cell 20 are excited.

また、第１ガスセル１０からみて−ｙ方向からその第１ガスセル１０に向けてプローブ光Ｌｂ１が照射され、第２ガスセル２０からみて−ｙ方向からその第２ガスセル２０に向けてプローブ光Ｌｂ２が照射される。そして、第１ガスセル１０を透過して第１ガスセル１０からみて＋ｙ方向に進むプローブ光Ｌｃ１を第１測定部１１の検出部が検出し、第２ガスセル２０を透過して第２ガスセル２０からみて＋ｙ方向に進むプローブ光Ｌｃ２を第２測定部２１の検出部が検出する。   Further, the probe light Lb1 is irradiated from the −y direction toward the first gas cell 10 as viewed from the first gas cell 10, and the probe light Lb2 is irradiated from the −y direction toward the second gas cell 20 as viewed from the second gas cell 20. Is done. Then, the detection unit of the first measurement unit 11 detects the probe light Lc1 that passes through the first gas cell 10 and travels in the + y direction as viewed from the first gas cell 10, and passes through the second gas cell 20 and viewed from the second gas cell 20. The detection unit of the second measurement unit 21 detects the probe light Lc2 traveling in the + y direction.

コイル３１は、被測定物５０の設置位置からみて−ｚ方向に配置され、コイル３２は、第２ガスセル２０からみて＋ｚ方向に配置されている。すなわち、コイル３１とコイル３２とは、被測定物５０、第１ガスセル１０、および第２ガスセル２０を＋ｚ方向に沿って挟む。   The coil 31 is disposed in the −z direction as viewed from the installation position of the DUT 50, and the coil 32 is disposed in the + z direction as viewed from the second gas cell 20. That is, the coil 31 and the coil 32 sandwich the DUT 50, the first gas cell 10, and the second gas cell 20 along the + z direction.

また、コントローラー３３は、第２測定部２１の出力と接続されている。コントローラー３３は、第２測定部２１による測定結果に応じた信号を生成して出力する手段であり、例えば、第２測定部２１により測定された信号を増幅する増幅部や、決められた帯域の信号を抽出するフィルタ部、信号の位相を調整する調整回路部などを有する。コントローラー３３の出力はコイル３１およびコイル３２に接続されている。コイル３１およびコイル３２は、コントローラー３３によって出力された信号に応じて、被測定物５０、第１ガスセル１０、および第２ガスセル２０が配置された測定空間Ａに向けて磁場を発生させる。より具体的には、第２測定部２１が測定した成分を小さくするように、第２ガスセル２０が配置された測定空間Ａに向けて、第２測定部２１による測定結果に応じた信号と逆位相の磁場を発生させる。この逆位相の磁場を受けて、磁場測定装置９０の外部から第２ガスセル２０が受ける磁場は打ち消される。また第１ガスセル１０がこの逆位相の磁場を受けるため、第２ガスセル２０との配置の差による磁場、すなわち第２ガスセル２０に比べて被測定物５０に近くに配置されていることに由来する磁場が第１ガスセル１０に残る。したがってコイル３１およびコイル３２は、被測定物、第１ガスセル、および第２ガスセルを予め決められた方向に沿って挟み、第２測定部により測定された成分が小さくなるように、第２ガスセルに向けて磁場を発生させる磁場発生手段の一例である。   The controller 33 is connected to the output of the second measurement unit 21. The controller 33 is a means for generating and outputting a signal according to the measurement result by the second measurement unit 21, for example, an amplification unit for amplifying the signal measured by the second measurement unit 21, or a predetermined band It has a filter part for extracting a signal, an adjustment circuit part for adjusting the phase of the signal, and the like. The output of the controller 33 is connected to the coil 31 and the coil 32. The coil 31 and the coil 32 generate a magnetic field toward the measurement space A in which the DUT 50, the first gas cell 10, and the second gas cell 20 are arranged according to the signal output by the controller 33. More specifically, in order to reduce the component measured by the second measurement unit 21, it is opposite to the signal corresponding to the measurement result by the second measurement unit 21 toward the measurement space A in which the second gas cell 20 is arranged. Generate a phase magnetic field. The magnetic field received by the second gas cell 20 from the outside of the magnetic field measuring apparatus 90 is canceled by receiving the magnetic field having the opposite phase. Further, since the first gas cell 10 receives the magnetic field having the opposite phase, it is derived from the magnetic field due to the difference in arrangement with the second gas cell 20, that is, closer to the object to be measured 50 than the second gas cell 20. A magnetic field remains in the first gas cell 10. Therefore, the coil 31 and the coil 32 sandwich the object to be measured, the first gas cell, and the second gas cell along a predetermined direction, so that the component measured by the second measurement unit becomes small. It is an example of the magnetic field generation means which generates a magnetic field toward.

出力部４０は、第１測定部１１が測定した第１ガスセル１０における磁場の＋ｚ方向の成分と、第２測定部２１が測定した第２ガスセル２０における磁場の＋ｚ方向の成分との差に応じた信号を出力する。したがって出力部４０は、第１測定部と第２測定部とがそれぞれ測定した成分の差に応じた信号を出力する出力部の一例である。磁場測定装置９０は、出力部４０が出力した信号に基づいて、被測定物５０における磁場の＋ｚ方向の成分を表す値を利用者に提示する。   The output unit 40 responds to the difference between the + z direction component of the magnetic field in the first gas cell 10 measured by the first measurement unit 11 and the + z direction component of the magnetic field in the second gas cell 20 measured by the second measurement unit 21. Output the signal. Therefore, the output unit 40 is an example of an output unit that outputs a signal corresponding to a difference between components measured by the first measurement unit and the second measurement unit. The magnetic field measuring device 90 presents a value representing the + z direction component of the magnetic field in the DUT 50 based on the signal output from the output unit 40 to the user.

例えば、第１測定部１１や第２測定部２１によって測定可能な範囲、すなわちダイナミックレンジを超える外部からの磁場ノイズを受けた場合に、磁場測定装置９０が備えるコイル３１、３２がないと、第１測定部１１または第２測定部２１のいずれか、あるいはその両方が測定不能となるため、第１測定部１１と第２測定部２１とがそれぞれ測定した成分の差に応じた信号を出力部４０が出力しても、その信号に基づいて、被測定物５０の磁場を表す正確な値を提示することは困難である。   For example, when receiving the magnetic field noise from the outside exceeding the range measurable by the first measuring unit 11 and the second measuring unit 21, that is, the dynamic range, if the coils 31, 32 included in the magnetic field measuring device 90 are not provided, Since either one or both of the first measurement unit 11 and the second measurement unit 21 cannot be measured, a signal corresponding to the difference between the components measured by the first measurement unit 11 and the second measurement unit 21 is output. Even if 40 is output, it is difficult to present an accurate value representing the magnetic field of the DUT 50 based on the signal.

磁場測定装置９０は、第２測定部２１により測定された成分が小さくなるように、コイル３１とコイル３２とが測定空間Ａに向けて磁場を発生させるので、ダイナミックレンジを超える磁場ノイズを受けた場合であっても、測定空間Ａの内側でその磁場ノイズが減衰し、被測定物５０の磁場の測定に対する磁場ノイズの影響が抑えられる。   Since the coil 31 and the coil 32 generate a magnetic field toward the measurement space A so that the component measured by the second measuring unit 21 becomes small, the magnetic field measuring device 90 receives magnetic field noise exceeding the dynamic range. Even in this case, the magnetic field noise is attenuated inside the measurement space A, and the influence of the magnetic field noise on the measurement of the magnetic field of the device under test 50 is suppressed.

また、コイル３１とコイル３２とが測定空間Ａに向けて発生させる磁場は、第２測定部２１により測定された成分を小さくさせるものであるが、第２測定部２１の測定対象である第２ガスセル２０は、被測定物５０とは異なる位置に置かれているので、この磁場によって、測定空間Ａにおいて被測定物５０そのものが受ける磁場ノイズの影響は完全に取り除き得ない場合もある。しかし、第１ガスセル１０は、被測定物５０との間に他のガスセルが配置されていないため、第２ガスセル２０に比べて被測定物５０の近くに配置されている。一方、第２ガスセル２０は、被測定物５０との間に第１ガスセル１０が配置されているため、第１ガスセル１０に比べて被測定物５０から遠くに配置されている。つまり、被測定物５０が生成する磁場の強さは被測定物５０からの距離の二乗に反比例するため、第２ガスセル２０は、第１ガスセル１０に比べて被測定物５０の磁場を検出しづらい。そして、磁場測定装置９０の出力部４０は、この第２ガスセル２０の第２測定部２１による測定結果と、第１ガスセル１０の第１測定部１１による測定結果との差に応じた信号を出力するので、第１ガスセル１０と第２ガスセル２０との両方が受ける磁場ノイズの影響が相殺され、被測定物５０に由来する磁場の影響が抽出される。したがって、この点においても、被測定物５０の磁場の測定に対する磁場ノイズの影響は抑えられる。   In addition, the magnetic field generated by the coil 31 and the coil 32 toward the measurement space A causes the component measured by the second measurement unit 21 to be small, but the second measurement target of the second measurement unit 21 is the second. Since the gas cell 20 is placed at a position different from the object to be measured 50, the magnetic field noise that the object to be measured 50 itself receives in the measurement space A may not be completely removed by this magnetic field. However, the first gas cell 10 is arranged closer to the measurement object 50 than the second gas cell 20 because no other gas cell is arranged between the first gas cell 10 and the measurement object 50. On the other hand, since the first gas cell 10 is disposed between the second gas cell 20 and the measurement object 50, the second gas cell 20 is disposed farther from the measurement object 50 than the first gas cell 10. That is, since the strength of the magnetic field generated by the device under test 50 is inversely proportional to the square of the distance from the device under test 50, the second gas cell 20 detects the magnetic field of the device under test 50 compared to the first gas cell 10. It ’s hard. Then, the output unit 40 of the magnetic field measuring device 90 outputs a signal corresponding to the difference between the measurement result by the second measurement unit 21 of the second gas cell 20 and the measurement result by the first measurement unit 11 of the first gas cell 10. Therefore, the influence of the magnetic field noise received by both the first gas cell 10 and the second gas cell 20 is canceled, and the influence of the magnetic field derived from the device under test 50 is extracted. Therefore, also in this respect, the influence of magnetic field noise on the measurement of the magnetic field of the DUT 50 can be suppressed.

なお、上述した実施形態において磁場測定装置９０は、出力部４０が第１ガスセル１０と第２ガスセル２０における測定結果の差に応じた信号を出力する、いわゆる一次微分型グラジオメーターとして機能していたが、二次微分型グラジオメーターや、より高次のグラジオメーターとして機能するように複数段に構成されていてもよい。   In the above-described embodiment, the magnetic field measurement device 90 functions as a so-called primary differential type gradiometer in which the output unit 40 outputs a signal corresponding to the difference between the measurement results in the first gas cell 10 and the second gas cell 20. However, it may be configured in a plurality of stages so as to function as a second-order differential type gradiometer or a higher-order gradiometer.

また、上述した実施形態において磁場測定装置９０は、磁場のうち１方向、すなわち＋ｚ方向の成分のみを測定対象としていたが、互いに異なる方向ごとに複数の磁場測定装置９０を設けることにより、例えば二次元空間や三次元空間の磁場を測定する磁場測定システムを構成してもよい。この磁場測定システムは、互いに異なる複数方向の成分を測定対象とする。したがってこの磁場測定システムは、上述の磁場測定装置を、互いに異なる方向ごとに複数備える磁場測定システムの一例である。   In the above-described embodiment, the magnetic field measurement device 90 measures only a component in one direction of the magnetic field, that is, the + z direction, but by providing a plurality of magnetic field measurement devices 90 in different directions, for example, two You may comprise the magnetic field measurement system which measures the magnetic field of three-dimensional space or three-dimensional space. In this magnetic field measurement system, components in a plurality of different directions are measured. Therefore, this magnetic field measurement system is an example of a magnetic field measurement system including a plurality of the above-described magnetic field measurement apparatuses in different directions.

例えば、図３は、磁場測定装置９０を２つ備えた磁場測定システムにおける、各ガスセルの配置を示す図である。同図に示すように、上述した磁場測定装置９０の構成を＋ｙ方向にも設けて、被測定物５０の磁場のうち、＋ｚ方向の成分に加えて、＋ｙ方向の成分を測定するようにしてもよい。   For example, FIG. 3 is a diagram illustrating an arrangement of each gas cell in a magnetic field measurement system including two magnetic field measurement devices 90. As shown in the figure, the above-described configuration of the magnetic field measuring device 90 is also provided in the + y direction, and in addition to the + z direction component, the + y direction component of the magnetic field of the object to be measured 50 is measured. Also good.

この磁場測定システムは、被測定物５０からみて＋ｚ方向に配置された第１ガスセル１０および第２ガスセル２０のほかに、被測定物５０からみて＋ｙ方向に配置された第３ガスセル６０と、その第３ガスセル６０からみて＋ｙ方向に配置された第４ガスセル７０とを有する。   This magnetic field measurement system includes, in addition to the first gas cell 10 and the second gas cell 20 disposed in the + z direction as viewed from the object to be measured 50, a third gas cell 60 disposed in the + y direction as viewed from the object to be measured 50, and its And a fourth gas cell 70 arranged in the + y direction when viewed from the third gas cell 60.

図３に示す配置では、第３ガスセル６０からみて−ｚ方向からその第３ガスセル６０に向けてポンプ光Ｌａ６が照射され、第４ガスセル７０からみて−ｚ方向からその第４ガスセル７０に向けてポンプ光Ｌａ７が照射される。これらポンプ光により、第３ガスセル６０および第４ガスセル７０に封入されたアルカリ金属などの原子は励起する。   In the arrangement shown in FIG. 3, the pump light La <b> 6 is irradiated from the −z direction toward the third gas cell 60 as viewed from the third gas cell 60, and from the −z direction toward the fourth gas cell 70 as viewed from the fourth gas cell 70. Pump light La7 is irradiated. By these pump lights, atoms such as alkali metals sealed in the third gas cell 60 and the fourth gas cell 70 are excited.

また、第３ガスセル６０からみて−ｘ方向からその第３ガスセル６０に向けてプローブ光Ｌｂ６が照射され、第４ガスセル７０からみて−ｘ方向からその第４ガスセル７０に向けてプローブ光Ｌｂ７が照射される。そして、第３ガスセル６０を透過して第３ガスセル６０からみて＋ｘ方向に進むプローブ光Ｌｃ６と、第４ガスセル７０を透過して第４ガスセル７０からみて＋ｘ方向に進むプローブ光Ｌｃ７とが、それぞれ検出され、それぞれの偏光面の回転角が計測されることにより、第３ガスセル６０および第４ガスセル７０の各磁場が測定される。   Also, the probe light Lb6 is irradiated from the −x direction toward the third gas cell 60 as viewed from the third gas cell 60, and the probe light Lb7 is irradiated from the −x direction toward the fourth gas cell 70 as viewed from the fourth gas cell 70. Is done. Then, the probe light Lc6 that passes through the third gas cell 60 and travels in the + x direction as viewed from the third gas cell 60, and the probe light Lc7 that passes through the fourth gas cell 70 and travels in the + x direction as viewed from the fourth gas cell 70, respectively. The magnetic fields of the third gas cell 60 and the fourth gas cell 70 are measured by detecting the rotation angles of the respective polarization planes.

被測定物５０、第３ガスセル６０、および第４ガスセル７０は、図示しない２つのコイルにより＋ｙ方向に沿って挟まれている。この２つのコイルは、第４ガスセル７０における磁場の測定結果に応じた信号と逆位相の磁場を、被測定物５０、第３ガスセル６０、および第４ガスセル７０が配置された測定空間に向けて発生させる。この逆位相の磁場を受けて、この磁場測定システムの外部から第４ガスセル７０が受ける磁場は打ち消される。また第３ガスセル６０がこの逆位相の磁場を受けるため、第３ガスセル６０が受けていて、且つ、第４ガスセル７０が受けていない磁場が第３ガスセル６０に残る。   The DUT 50, the third gas cell 60, and the fourth gas cell 70 are sandwiched along the + y direction by two coils (not shown). These two coils direct the magnetic field having the opposite phase to the signal corresponding to the measurement result of the magnetic field in the fourth gas cell 70 toward the measurement space in which the DUT 50, the third gas cell 60, and the fourth gas cell 70 are arranged. generate. In response to the magnetic field having the opposite phase, the magnetic field received by the fourth gas cell 70 from the outside of the magnetic field measurement system is canceled. Further, since the third gas cell 60 receives the magnetic field having the opposite phase, the magnetic field which is received by the third gas cell 60 and which is not received by the fourth gas cell 70 remains in the third gas cell 60.

その結果、第１ガスセル１０および第２ガスセル２０を透過したプローブ光からは、被測定物５０における磁場の＋ｚ方向の成分が測定され、第３ガスセル６０および第４ガスセル７０を透過したプローブ光からは、被測定物５０における磁場の＋ｙ方向の成分が測定される。なお、上述したポンプ光およびプローブ光の照射方向は単なる一例であり、磁場測定システムにおけるこれら光の照射の態様は、この例に限るものではない。   As a result, from the probe light transmitted through the first gas cell 10 and the second gas cell 20, the component in the + z direction of the magnetic field in the object to be measured 50 is measured, and from the probe light transmitted through the third gas cell 60 and the fourth gas cell 70. The component in the + y direction of the magnetic field in the DUT 50 is measured. Note that the above-described irradiation directions of the pump light and the probe light are merely examples, and the mode of irradiation of these lights in the magnetic field measurement system is not limited to this example.

１０…第１ガスセル、１１…第１測定部、２０…第２ガスセル、２１…第２測定部、３１…コイル、３２…コイル、３３…コントローラー、４０…出力部、５０…被測定物、６０…第３ガスセル、７０…第４ガスセル、９０…磁場測定装置、Ａ…測定空間、Ｌａ１，Ｌａ２，Ｌａ６，Ｌａ７…ポンプ光、Ｌｂ１，Ｌｂ２，Ｌｂ６，Ｌｂ７…プローブ光、Ｌｃ１，Ｌｃ２，Ｌｃ６，Ｌｃ７…プローブ光 DESCRIPTION OF SYMBOLS 10 ... 1st gas cell, 11 ... 1st measurement part, 20 ... 2nd gas cell, 21 ... 2nd measurement part, 31 ... Coil, 32 ... Coil, 33 ... Controller, 40 ... Output part, 50 ... Device under test, 60 ... 3rd gas cell, 70 ... 4th gas cell, 90 ... Magnetic field measuring device, A ... Measurement space, La1, La2, La6, La7 ... Pump light, Lb1, Lb2, Lb6, Lb7 ... Probe light, Lc1, Lc2, Lc6 Lc7: Probe light

本発明に係るひとつの磁場測定装置は、被測定物が設置される位置に対して第１方向に
配置された第１ガスセルと、前記第１ガスセルに対して前記第１方向に設置された第２ガ
スセルと、前記第１ガスセルを通過した第１の光を用いて磁場の前記第１方向の成分を測
定する第１測定部と、前記第２ガスセルを通過した第２の光を用いて磁場の前記第１方向
の成分を測定する第２測定部と、前記被測定物、前記第１ガスセル、および前記第２ガス
セルを、前記第１方向において挟むように対向して配置された一対の磁場発生部と、前記
第１測定部及び前記第２測定部における前記第１方向の成分の測定結果を基にして生成さ
れた所定の信号を出力する出力部と、を含み、前記磁場発生部は、前記第２の測定部で計
測される前記第１方向の成分の測定値が、小さくなる磁場を前記第２ガスセルに向けて発
生させることを特徴とする。
本発明に係るひとつの磁場測定システムは、上記のひとつの磁場測定装置を、互いに異
なる方向ごとに複数備えることが好ましい。
上記のひとつの磁場測定システムにおいて、前記互いに異なる方向は、前記第１方向に
平行な方向と前記第１方向に直角に交わる方向であるが好ましい。
本発明に係るひとつの磁場測定方法は、第１測定部が、被測定物の設置される位置から
みて予め決められた第１方向に配置された第１ガスセルに光を照射して、当該第１ガスセ
ルにおける磁場の前記第１方向の成分を測定し、第２測定部が、前記第１ガスセルからみ
て前記第１方向に配置された第２ガスセルに光を照射して、当該第２ガスセルにおける磁
場の前記第１方向の成分を測定し、磁場発生手段が、前記被測定物、前記第１ガスセル、
および前記第２ガスセルを前記第１方向に沿って挟み、前記第２測定部により測定された
前記第１方向の成分が小さくなるように、前記第２ガスセルに向けて磁場を発生させ、出
力部が、前記第１測定部と前記第２測定部とがそれぞれ測定した前記第１方向の成分の差
に応じた信号を出力することを特徴とする。
本発明は、被測定物が設置される位置からみて予め決められた方向に配置された第１ガ
スセルと、前記第１ガスセルからみて前記方向に配置された第２ガスセルと、前記第１ガ
スセルに光を照射して、当該第１ガスセルにおける磁場の前記方向の成分を測定する第１
測定部と、前記第２ガスセルに光を照射して、当該第２ガスセルにおける磁場の前記方向
の成分を測定する第２測定部と、前記被測定物、前記第１ガスセル、および前記第２ガス
セルを前記方向に沿って挟み、前記第２測定部により測定された前記成分が小さくなるよ
うに、前記第２ガスセルに向けて磁場を発生させる磁場発生手段と、前記第１測定部と前
記第２測定部とがそれぞれ測定した前記成分の差に応じた信号を出力する出力部とを備え
ることを特徴とする磁場測定装置を提供する。この構成によれば、ガスセルに光を照射し
てそのガスセルにおける磁場の予め決められた方向の成分を測定する測定部に対し、その
測定部が測定可能な範囲を超えた外乱がある場合でも、その外乱に影響されずに被測定物
の磁場を測定することができる。
本発明に係るひとつの磁場測定装置は、測定空間に配置された第１ガスセルと、前記測定空間において前記第１ガスセルに対して第１方向に設置された第２ガスセルと、前記第１ガスセルの磁場の前記第１方向の成分を測定する第１測定部と、前記第２ガスセルの磁場の前記第１方向の成分を測定する第２測定部と、前記測定空間に磁場を発生させる磁場発生部と、前記第２測定部と前記磁場発生部とに接続されたコントローラーと、を含み、前記コントローラーは、前記第２ガスセルの磁場の前記第１方向の成分が小さくなるように前記磁場発生部をコントロールすること、を特徴とする。
本発明に係るひとつの磁場測定システムは、上記のひとつの磁場測定装置を、互いに異なる方向ごとに複数備えることを特徴とする。
上記のひとつの磁場測定システムにおいて、前記互いに異なる方向は、前記第１方向に平行な方向と前記第１方向に直角に交わる方向であることが好ましい。
本発明に係るひとつの磁場測定方法は、第１測定部が、測定空間に配置された第１ガスセルに光を照射して、当該第１ガスセルにおける磁場の第１方向の成分を測定し、第２測定部が、前記測定空間において前記第１ガスセルからみて前記第１方向に配置された第２ガスセルに光を照射して、当該第２ガスセルにおける磁場の前記第１方向の成分を測定し、磁場発生手段が、前記第２測定部により測定された前記第２ガスセルにおける磁場の前記第１方向の成分が小さくなるように、前記第２ガスセルに向けて磁場を発生させ、出力部が、前記第１測定部と前記第２測定部とがそれぞれ測定した前記第１方向の成分の差に応じた信号を出力することを特徴とする。 One magnetic field measurement apparatus according to the present invention includes a first gas cell disposed in a first direction with respect to a position where an object to be measured is disposed, and a first gas cell disposed in the first direction with respect to the first gas cell. A two-gas cell, a first measurement unit that measures a component of the magnetic field in the first direction using the first light that has passed through the first gas cell, and a magnetic field that uses the second light that has passed through the second gas cell. A pair of magnetic fields disposed opposite to each other so as to sandwich the second object to be measured, the first gas cell, and the second gas cell in the first direction. A generating unit; and an output unit that outputs a predetermined signal generated based on a measurement result of the component in the first direction in the first measuring unit and the second measuring unit, and the magnetic field generating unit includes: , Component of the first direction measured by the second measuring unit Value is, the smaller the magnetic field and wherein the generating toward the second gas cell.
One magnetic field measurement system according to the present invention preferably includes a plurality of the single magnetic field measurement devices in different directions.
In the one magnetic field measurement system, the different directions are preferably a direction parallel to the first direction and a direction perpendicular to the first direction.
In one magnetic field measurement method according to the present invention, the first measurement unit irradiates light to the first gas cell arranged in the first direction determined in advance from the position where the object to be measured is installed. The component in the first direction of the magnetic field in one gas cell is measured, and the second measurement unit irradiates light to the second gas cell arranged in the first direction as viewed from the first gas cell, and in the second gas cell A component of the magnetic field in the first direction is measured, and a magnetic field generating means includes the object to be measured, the first gas cell,
And the second gas cell is sandwiched along the first direction, and a magnetic field is generated toward the second gas cell so that a component in the first direction measured by the second measurement unit is reduced, and an output unit However, the first measurement unit and the second measurement unit each output a signal corresponding to the difference between the components in the first direction.
The present invention provides a first gas cell disposed in a predetermined direction as viewed from a position where an object to be measured is installed, a second gas cell disposed in the direction as viewed from the first gas cell, and the first gas cell. First to irradiate light and measure a component in the direction of the magnetic field in the first gas cell
A measurement unit; a second measurement unit that irradiates light to the second gas cell to measure a component of the magnetic field in the direction; and the object to be measured, the first gas cell, and the second gas cell. , Along the direction, and a magnetic field generating means for generating a magnetic field toward the second gas cell so that the component measured by the second measuring unit becomes small, the first measuring unit, and the second measuring unit A magnetic field measuring apparatus comprising: an output unit that outputs a signal corresponding to the difference between the components measured by the measuring unit. According to this configuration, for a measurement unit that irradiates light to a gas cell and measures a component in a predetermined direction of the magnetic field in the gas cell, even when there is a disturbance that exceeds the range that the measurement unit can measure, The magnetic field of the object to be measured can be measured without being affected by the disturbance.
One magnetic field measurement apparatus according to the present invention includes a first gas cell arranged in a measurement space, a second gas cell installed in a first direction with respect to the first gas cell in the measurement space, and a first gas cell A first measurement unit that measures a component of the magnetic field in the first direction, a second measurement unit that measures a component of the magnetic field of the second gas cell in the first direction, and a magnetic field generation unit that generates a magnetic field in the measurement space And a controller connected to the second measurement unit and the magnetic field generation unit, wherein the controller controls the magnetic field generation unit to reduce a component in the first direction of the magnetic field of the second gas cell. It is characterized by controlling.
One magnetic field measurement system according to the present invention includes a plurality of the above-described single magnetic field measurement devices in different directions.
In the one magnetic field measurement system, it is preferable that the different directions are a direction parallel to the first direction and a direction perpendicular to the first direction.
In one magnetic field measurement method according to the present invention, the first measurement unit irradiates light to the first gas cell arranged in the measurement space, measures the component in the first direction of the magnetic field in the first gas cell, Two measuring units irradiate light to the second gas cell disposed in the first direction when viewed from the first gas cell in the measurement space, and measure a component in the first direction of the magnetic field in the second gas cell; The magnetic field generation means generates a magnetic field toward the second gas cell so that a component in the first direction of the magnetic field in the second gas cell measured by the second measurement unit is reduced, and an output unit includes the output unit The first measurement unit and the second measurement unit each output a signal corresponding to the difference between the components in the first direction measured.

Claims (4)

被測定物が設置される位置に対して第１方向に配置された第１ガスセルと、
前記第１ガスセルに対して前記第１方向に設置された第２ガスセルと、
前記第１ガスセルを通過した第１の光を用いて磁場の前記第１方向の成分を測定する第１測定部と、
前記第２ガスセルを通過した第２の光を用いて磁場の前記第１方向の成分を測定する第２測定部と、
前記被測定物、前記第１ガスセル、および前記第２ガスセルを、前記第１方向において挟むように対向して配置された一対の磁場発生部と、
前記第１測定部及び前記第２測定部における前記第１方向の成分の測定結果を基にして生成された所定の信号を出力する出力部と、を含み、
前記磁場発生部は、前記第２の測定部で計測される前記第１方向の成分の測定値が、小さくなる磁場を前記第２ガスセルに向けて発生させること
を特徴とする磁場測定装置。 A first gas cell arranged in a first direction with respect to a position where the object to be measured is installed;
A second gas cell installed in the first direction with respect to the first gas cell;
A first measurement unit that measures a component of the magnetic field in the first direction using the first light that has passed through the first gas cell;
A second measurement unit that measures a component of the magnetic field in the first direction using the second light that has passed through the second gas cell;
A pair of magnetic field generators arranged to face each other so as to sandwich the object to be measured, the first gas cell, and the second gas cell in the first direction;
An output unit that outputs a predetermined signal generated based on a measurement result of the component in the first direction in the first measurement unit and the second measurement unit;
The magnetic field generation unit generates a magnetic field in which the measurement value of the component in the first direction measured by the second measurement unit is reduced toward the second gas cell. 請求項１に記載の磁場測定装置を、互いに異なる方向ごとに複数備える
ことを特徴とする磁場測定システム。 A magnetic field measurement system comprising a plurality of magnetic field measurement devices according to claim 1 in different directions. 前記互いに異なる方向は、前記第１方向に平行な方向と前記第１方向に直角に交わる方向である
ことを特徴とする請求項２に記載の磁場測定システム。 The magnetic field measurement system according to claim 2, wherein the different directions are a direction parallel to the first direction and a direction perpendicular to the first direction. 第１測定部が、被測定物の設置される位置からみて予め決められた第１方向に配置された第１ガスセルに光を照射して、当該第１ガスセルにおける磁場の前記第１方向の成分を測定し、
第２測定部が、前記第１ガスセルからみて前記第１方向に配置された第２ガスセルに光を照射して、当該第２ガスセルにおける磁場の前記第１方向の成分を測定し、
磁場発生手段が、前記被測定物、前記第１ガスセル、および前記第２ガスセルを前記第１方向に沿って挟み、前記第２測定部により測定された前記第１方向の成分が小さくなるように、前記第２ガスセルに向けて磁場を発生させ、
出力部が、前記第１測定部と前記第２測定部とがそれぞれ測定した前記第１方向の成分の差に応じた信号を出力する
ことを特徴とする磁場測定方法。 The first measurement unit irradiates light to the first gas cell arranged in the first direction determined in advance from the position where the object to be measured is installed, and the magnetic field component in the first gas cell in the first direction Measure and
The second measuring unit irradiates light to the second gas cell disposed in the first direction as viewed from the first gas cell, and measures a component of the magnetic field in the second gas cell in the first direction;
The magnetic field generation means sandwiches the object to be measured, the first gas cell, and the second gas cell along the first direction so that the component in the first direction measured by the second measurement unit becomes small. Generating a magnetic field toward the second gas cell;
The output unit outputs a signal corresponding to a difference in components in the first direction measured by the first measurement unit and the second measurement unit.
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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5925726A (en) * 1982-07-31 1984-02-09 株式会社島津製作所 Diagnostic observation apparatus
JPH04357481A (en) * 1991-05-13 1992-12-10 Hoxan Corp Device for eliminating magnetic noise using squid
JP2011007659A (en) * 2009-06-26 2011-01-13 Seiko Epson Corp Magnetic sensor
JP2011007660A (en) * 2009-06-26 2011-01-13 Seiko Epson Corp Magnetic sensor

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5925726A (en) * 1982-07-31 1984-02-09 株式会社島津製作所 Diagnostic observation apparatus
JPH04357481A (en) * 1991-05-13 1992-12-10 Hoxan Corp Device for eliminating magnetic noise using squid
JP2011007659A (en) * 2009-06-26 2011-01-13 Seiko Epson Corp Magnetic sensor
JP2011007660A (en) * 2009-06-26 2011-01-13 Seiko Epson Corp Magnetic sensor

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