JPH0792110A - Sar measuring equipment and measuring method - Google Patents
Sar measuring equipment and measuring methodInfo
- Publication number
- JPH0792110A JPH0792110A JP25641893A JP25641893A JPH0792110A JP H0792110 A JPH0792110 A JP H0792110A JP 25641893 A JP25641893 A JP 25641893A JP 25641893 A JP25641893 A JP 25641893A JP H0792110 A JPH0792110 A JP H0792110A
- Authority
- JP
- Japan
- Prior art keywords
- magnetic field
- sar
- biological model
- detecting means
- pseudo biological
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Landscapes
- Measuring Magnetic Variables (AREA)
- Measurement And Recording Of Electrical Phenomena And Electrical Characteristics Of The Living Body (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明はＳＡＲ測定装置および測
定方法に関し、特に携帯無線機からの電波のＳＡＲを測
定するＳＡＲ測定装置および測定方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a SAR measuring device and a measuring method, and more particularly to a SAR measuring device and a measuring method for measuring SAR of a radio wave from a portable wireless device.
【０００２】[0002]
【従来の技術】ＳＡＲ（Ｓｐｅｃｉｆｉｃ Ａｂｓｏｒ
ｐｔｉｏｎ Ｒａｔｅ、比吸収率）は、生体が電波の照
射を受けたことにより生じる単位質量当たりの吸収電力
を示すものであり、生体を電波の影響から防護する郵政
省の電波防護指針の基礎指針として用いられている。2. Description of the Related Art SAR (Specific Absor)
(ption rate, specific absorption rate) indicates the absorbed power per unit mass generated when the living body is irradiated with radio waves, and serves as a basic guideline of the Ministry of Posts and Telecommunications's radio wave protection guidelines to protect the living body from the effects of radio waves. It is used.
【０００３】従来、ＳＡＲの測定には、人体などの生体
と誘電率および透磁率を等しくしたファントムと呼ばれ
る擬似生体模型を用い、このファントムに電波を照射す
るとファントムが照射電波のエネルギーを吸収して温度
上昇するので、その温度を測定してＳＡＲを算出する方
法が知られている。Conventionally, for the measurement of SAR, a pseudo-biological model called a phantom having the same permittivity and magnetic permeability as that of a living body such as a human body is used. Since the temperature rises, a method of measuring the temperature and calculating the SAR is known.
【０００４】この場合、ファントムの温度を測定するの
に、たとえば、ファントムの表面の複数カ所に温度測定
用のプローブを取り付け、各プローブから温度を測定す
る方法が知られている。また、特開昭３−７３８３６号
公報には、赤外線サーモグラフィでファントムの温度を
測定する方法が開示されている。In this case, in order to measure the temperature of the phantom, for example, a method is known in which temperature measuring probes are attached to a plurality of points on the surface of the phantom and the temperature is measured from each probe. Further, Japanese Patent Laid-Open No. 3-73836 discloses a method of measuring the temperature of a phantom by infrared thermography.
【０００５】[0005]
【発明が解決しようとする課題】しかし、上述した従来
の方法を用いたＳＡＲ測定装置では、携帯無線機のよう
に照射電波の放射電力が小さい場合にはファントムの温
度上昇が少ないため温度測定に困難が伴い測定誤差が大
きくなってしまうという問題がある。However, in the SAR measuring apparatus using the above-mentioned conventional method, the temperature rise of the phantom is small when the radiated power of the radiated radio wave is small like a portable radio device, so that the temperature measurement is not performed. There is a problem that the measurement error becomes large due to difficulty.
【０００６】そこで、携帯無線機の照射電波と同じ周波
数で放射電力がたとえば１００倍の電波を照射し、この
場合のファントムの温度上昇を測定してＳＡＲを求め、
このＳＡＲを１００で割って携帯無線機からの電波のＳ
ＡＲとして求める方法が考えられるが、この場合では、
携帯無線機から通常の１００倍の放射電力の電波を出力
することができないため、ＳＡＲの測定に携帯無線機の
実物を使用することができず、特別に測定用の電波発生
装置を用意しなければならないという問題がある。Therefore, a radiant power of, for example, 100 times is radiated at the same frequency as the radiated radio wave of the portable radio, and the temperature rise of the phantom in this case is measured to obtain the SAR,
Divide this SAR by 100 to obtain the S of the radio wave from the portable wireless device.
A method of obtaining as AR can be considered, but in this case,
Since it is not possible to output radio waves with radiated power 100 times higher than usual from the portable wireless device, the actual portable wireless device cannot be used for SAR measurement, and a special radio wave generator for measurement must be prepared. There is a problem that it must be.
【０００７】ところで、近年ファントムの外部磁界を測
定することによりＳＡＲを求める方法が提案されてお
り、たとえば、電子情報通信学会技術研究報告「ＥＭＣ
Ｊ９３−５、マイクロ波被曝の近傍磁界を用いた顔面Ｓ
ＡＲの推定」には、ファントムの外部磁界の磁界強度の
二乗値がＳＡＲに比例することが報告されている。この
方法によるとファントムの温度測定が不要なため、簡易
な測定手法で且つ小さな測定誤差でＳＡＲを測定するこ
とが可能となる。By the way, in recent years, a method of obtaining the SAR by measuring the external magnetic field of the phantom has been proposed.
J93-5, Face S using near magnetic field of microwave exposure
It has been reported in "estimation of AR" that the square value of the magnetic field strength of the external magnetic field of the phantom is proportional to SAR. According to this method, since it is not necessary to measure the temperature of the phantom, it is possible to measure the SAR with a simple measurement method and with a small measurement error.
【０００８】本発明は上記の点にかんがみてなされたも
ので、ファントムの外部磁界を測定する方法を用い、携
帯無線機からの電波のＳＡＲの測定を容易に行えるＳＡ
Ｒ測定装置を提供することを目的とする。The present invention has been made in view of the above points, and SA which can easily measure the SAR of the radio wave from the portable radio device by using the method of measuring the external magnetic field of the phantom.
An object is to provide an R measuring device.
【０００９】[0009]
【課題を解決するための手段】本発明は上記の目的を達
成するために、人体などの生体と誘電率および透磁率が
等しい擬似生体模型と、この擬似生体模型に固定された
電磁波発生手段と、前記擬似生体模型の周囲における前
記電磁波発生手段による磁界のうち互いに平行でない３
以上の方向の磁界の強度を測定する磁界検出手段と、前
記擬似生体模型と前記磁界検出手段との相対位置を互い
に平行でない３以上の方向に移動する移動手段と、前記
磁界検出手段により得られた磁界強度に基づいて前記擬
似生体模型の電磁波の吸収量を算出するＳＡＲ算出手段
とからＳＡＲ測定装置を構成した。In order to achieve the above object, the present invention provides a pseudo biological model having the same permittivity and magnetic permeability as that of a living body such as a human body, and an electromagnetic wave generating means fixed to the pseudo biological model. , The magnetic fields generated by the electromagnetic wave generating means around the pseudo biological model are not parallel to each other 3
The magnetic field detecting means for measuring the strength of the magnetic field in the above directions, the moving means for moving the relative positions of the pseudo biological model and the magnetic field detecting means in three or more directions which are not parallel to each other, and the magnetic field detecting means are provided. The SAR measuring device is composed of the SAR calculating means for calculating the electromagnetic wave absorption amount of the pseudo biological model based on the magnetic field strength.
【００１０】[0010]
【作用】本発明は以上の構成によって、移動手段で擬似
生体模型と磁界検出手段との相対位置を互いに平行でな
い３以上の方向に移動しながら、擬似生体模型に固定さ
れた電磁波発生手段からの電磁波による磁界の強度を磁
界検出手段により検出し、この磁界強度に基づきＳＡＲ
算出手段が擬似生体模型の電磁波の吸収量を算出する。According to the present invention, the moving means moves the relative positions of the pseudo biological model and the magnetic field detecting means in three or more directions which are not parallel to each other, and the electromagnetic wave generating means fixed to the pseudo biological model is used. The magnetic field strength due to the electromagnetic wave is detected by the magnetic field detecting means, and based on this magnetic field strength, the SAR
The calculation means calculates the amount of electromagnetic waves absorbed by the pseudo biological model.
【００１１】[0011]
【実施例】以下本発明を図面に基づいて説明する。DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the drawings.
【００１２】図１は本発明によるＳＡＲ測定装置の一実
施例の斜視図である。FIG. 1 is a perspective view of an embodiment of the SAR measuring apparatus according to the present invention.
【００１３】１は、人体の頭部と誘電率および透磁率を
等しくしたファントムであり、人体の頭部を模した形状
にしテーブル１０上で円柱形枠８の中央に固定されてい
る。２は携帯無線機であり、ファントム１の近傍の携帯
無線機２を使用する場合の位置に取付けられている。本
実施例において、ファントム１は人体の頭部を模した形
状にしたが、より簡易な測定を行う場合には円柱形や球
形などのファントムを用いてもよい。３は磁界検出プロ
ーブであり、合成樹脂等の絶縁体で覆われて球形になっ
ており、棒状のアーム４の先端に固定されている。Reference numeral 1 denotes a phantom having a permittivity and magnetic permeability equal to those of the human body head, which is shaped like the human head and is fixed to the center of a cylindrical frame 8 on a table 10. Reference numeral 2 denotes a portable wireless device, which is mounted in a position near the phantom 1 when using the portable wireless device 2. In this embodiment, the phantom 1 has a shape imitating the head of a human body, but a columnar or spherical phantom may be used for more simple measurement. A magnetic field detection probe 3 is covered with an insulating material such as synthetic resin and has a spherical shape, and is fixed to the tip of a rod-shaped arm 4.
【００１４】アーム４は、歯車５を回転させることによ
り上下方向（ｚ軸方向）に動かすことができるようにな
っている。また、アーム４と歯車５とは、歯車６を回転
させることにより円柱形枠８の上面の円の直径方向（ｒ
軸方向）に張り渡されたレール７に沿って動かすことが
できるようになっている。歯車９はその回転軸がテーブ
ル１０に固定されており、歯車９を回転させることによ
り円柱形枠８をファントム１のまわり（θ軸方向）で回
転させられるようになっている。The arm 4 can be moved in the vertical direction (z-axis direction) by rotating the gear 5. Further, the arm 4 and the gear 5 are arranged such that when the gear 6 is rotated, a diameter direction (r
It can be moved along the rail 7 stretched in the axial direction). The rotation axis of the gear 9 is fixed to the table 10, and by rotating the gear 9, the cylindrical frame 8 can be rotated around the phantom 1 (in the θ axis direction).
【００１５】図２は本発明によるＳＡＲ測定装置のブロ
ック図である。FIG. 2 is a block diagram of the SAR measuring apparatus according to the present invention.
【００１６】磁界検出プローブ３はファントム１の周囲
の磁界強度に応じて起電力を生じる。１１は、磁界検出
プローブ３に接続された電圧測定手段であり、たとえば
スペクトラムアナライザが用いられる。ＳＡＲ算出手段
１２は、電圧測定手段１１で測定した電圧に基づいて磁
界強度を算出し、この磁界強度に基づいてＳＡＲを算出
する。このＳＡＲ算出手段１２はたとえばマイクロコン
ピュータで構成される。The magnetic field detection probe 3 produces an electromotive force according to the magnetic field strength around the phantom 1. Reference numeral 11 is a voltage measuring means connected to the magnetic field detection probe 3, and for example, a spectrum analyzer is used. The SAR calculating means 12 calculates the magnetic field strength based on the voltage measured by the voltage measuring means 11, and calculates the SAR based on the magnetic field strength. The SAR calculating means 12 is composed of, for example, a microcomputer.
【００１７】磁界検出プローブ３は、互いに直交する３
方向の磁界強度を検出するために３つの磁界検出素子か
ら成る。The magnetic field detection probes 3 are orthogonal to each other 3
It is composed of three magnetic field detecting elements for detecting the magnetic field strength in the direction.
【００１８】図３は、図１に示した磁界検出プローブ３
内の磁界検出素子を示し、（ａ）は１つの磁界検出素子
の断面図であり、（ｂ）は磁界検出素子の（ａ）に示し
たＣ−Ｃ′断面図である。FIG. 3 shows the magnetic field detection probe 3 shown in FIG.
2A is a cross-sectional view of one magnetic field detection element, and FIG. 6B is a cross-sectional view taken along line CC ′ of FIG.
【００１９】磁界検出素子３０は、銅線などの導線３１
と、導線３１のまわりを円柱状に覆う絶縁体３４と、銅
線などをメッシュにして絶縁体３４の周囲を覆った導体
３２と、円筒状の導体３２の円の部分の直径と同じ太さ
の銅棒などの導体３３とから成り、導線３１と導体３３
とは点Ｇで接続され全体が円形に形成されおり、磁界検
出素子３０のＣ−Ｃ′断面は、図３（ｂ）に示すよう
に、導線３１のまわりに絶縁体３４が設けられ、そのま
わりを導体３２が覆うように構成されている。The magnetic field detecting element 30 includes a conducting wire 31 such as a copper wire.
And an insulator 34 that covers the conductor 31 in a cylindrical shape, a conductor 32 that covers the periphery of the insulator 34 with a mesh of copper wire, and the same thickness as the diameter of the circle portion of the cylindrical conductor 32. And a conductor 33 such as a copper rod of
Are connected to each other at a point G and are formed in a circular shape as a whole. In the CC ′ cross section of the magnetic field detecting element 30, as shown in FIG. The conductor 32 is configured to cover the surroundings.
【００２０】導線３１、導体３２および導体３３の材質
は導電率が互いに等しいものであればよく、銅の代りに
すべての導体の材質をたとえば真鍮にしてもよい。ま
た、導体３２の長さｎと導体３３の長さｍとは等しくな
るように構成されている。The materials of the conductor 31, the conductor 32 and the conductor 33 may be those having the same conductivity, and all the conductors may be made of brass instead of copper. Further, the length n of the conductor 32 and the length m of the conductor 33 are configured to be equal.
【００２１】この磁界検出素子３０は、導線３１、導体
３２および導体３３が形成する円に対して垂直方向の磁
束の変化が生じると、それに応じて導線３１と導体３３
に電流が発生し、端子Ｄと端子Ｆとの間に電位差を生じ
る。In the magnetic field detecting element 30, when the magnetic flux changes in the direction perpendicular to the circle formed by the conductor 31, the conductor 32, and the conductor 33, the conductor 31 and the conductor 33 respond accordingly.
An electric current is generated in the terminal, and a potential difference is generated between the terminals D and F.
【００２２】図４は磁界検出素子３０の導線３１、導体
３２および導体３３が形成する円に対して電界が垂直方
向に存在する場合の電界による影響を説明する図であ
る。FIG. 4 is a diagram for explaining the influence of the electric field when the electric field exists in the direction perpendicular to the circle formed by the conductor 31, the conductor 32 and the conductor 33 of the magnetic field detecting element 30.
【００２３】図５は磁界検出素子３０の導線３１、導体
３２および導体３３が形成する円に対して磁界が垂直方
向に存在する場合の磁界による影響を説明する図であ
る。FIG. 5 is a view for explaining the influence of the magnetic field when the magnetic field exists in the direction perpendicular to the circle formed by the conductor 31, the conductor 32 and the conductor 33 of the magnetic field detecting element 30.
【００２４】図４に示すように、紙面の表から裏に向か
って電界Ｅが生じた場合には、導線３１には電流Ｉ3 が
矢印の方向に流れ、導体３２には電流Ｉ2 が矢印の方向
に流れ、導体３３には電流Ｉ1 が矢印の方向に流れる。
この場合には、電流Ｉ1 の大きさと電流Ｉ3 の大きさと
が等しいため、互いに打ち消しあって端子Ｄと端子Ｆと
の間には電位差を生じない。As shown in FIG. 4, when an electric field E is generated from the front side to the back side of the paper, a current I 3 flows in the conductor 31 in the direction of the arrow, and a current I 2 flows in the conductor 32 in the arrow direction. , And a current I 1 flows through the conductor 33 in the direction of the arrow.
In this case, since the magnitude of the current I 1 and the magnitude of the current I 3 are equal to each other, they cancel each other out and no potential difference is generated between the terminals D and F.
【００２５】一方、図５に示すように、紙面の表から裏
に向かって磁界Ｈが生じた場合には、導線３１には電流
Ｉ6 が矢印の方向に流れ、導体３２には電流Ｉ5 が矢印
の方向に流れ、導体３３には電流Ｉ4 が矢印の方向に流
れる。この場合には、端子Ｄと端子Ｆとの間に磁界Ｈの
強度に応じた電位差を生じる。On the other hand, as shown in FIG. 5, when a magnetic field H is generated from the front side to the back side of the paper, a current I 6 flows in the conductor 31 in the direction of the arrow and a current I 5 flows in the conductor 32. Flows in the direction of the arrow, and a current I 4 flows in the conductor 33 in the direction of the arrow. In this case, a potential difference corresponding to the strength of the magnetic field H is generated between the terminals D and F.
【００２６】すなわち、磁界検出素子３０を図３（ａ）
に示すように構成することにより、電界を検出すること
なく磁界のみを検出することができる。That is, the magnetic field detecting element 30 is shown in FIG.
With the configuration as shown in, it is possible to detect only the magnetic field without detecting the electric field.
【００２７】図６は、磁界検出プローブ３内の磁界検出
素子の配置を説明する図である。FIG. 6 is a diagram for explaining the arrangement of the magnetic field detecting elements in the magnetic field detecting probe 3.
【００２８】本実施例では、磁界検出プローブ３は３つ
の磁界検出素子から成り、３０ａ、３０ｂ、３０ｃが、
それぞれ図３（ａ）に示した磁界検出素子３０と同様の
磁界検出素子である。磁界検出素子３０ａ、３０ｂ、３
０ｃは、それぞれの導体が形成する円の面どうしが互い
に直交し、それぞれの円の中心どうしがほぼ一致するよ
うに配置され、図６に示すように球形の骨格を形成す
る。In this embodiment, the magnetic field detection probe 3 is composed of three magnetic field detection elements, and 30a, 30b and 30c are
Each is a magnetic field detection element similar to the magnetic field detection element 30 shown in FIG. Magnetic field detection elements 30a, 30b, 3
0c is arranged so that the planes of the circles formed by the conductors are orthogonal to each other and the centers of the circles are substantially coincident with each other, forming a spherical skeleton as shown in FIG.
【００２９】磁界検出プローブ３は、各磁界検出素子の
導体どうしが接触することがないように球形の骨格の周
囲を絶縁体で全体が球形となるように包んで形成され
る。磁界検出素子３０ａ、３０ｂ、３０ｃの各端子（図
３（ａ）の端子ＤおよびＦに相当する端子）からは信号
線が出ており、これらの信号線は一束にして信号線Ｊと
して引き出される。この信号線Ｊは、図１に示したアー
ム４に沿って引き出され電圧測定手段１１に接続され
る。The magnetic field detection probe 3 is formed by wrapping a spherical skeleton with an insulating material so that the conductors of the respective magnetic field detection elements are not in contact with each other. Signal lines are output from the respective terminals of the magnetic field detection elements 30a, 30b, 30c (terminals corresponding to the terminals D and F in FIG. 3A), and these signal lines are bundled and led out as a signal line J. Be done. The signal line J is drawn out along the arm 4 shown in FIG. 1 and connected to the voltage measuring means 11.
【００３０】図７は、図３（ａ）に示した磁界検出プロ
ーブ３を用いて図１に示したファントム１の外部磁界を
測定する様子を説明する図である。図１および図６と同
じ構成部分には同じ参照番号を付してある。FIG. 7 is a diagram for explaining how to measure the external magnetic field of the phantom 1 shown in FIG. 1 using the magnetic field detection probe 3 shown in FIG. 3 (a). The same components as those in FIGS. 1 and 6 are designated by the same reference numerals.
【００３１】３ａは、図６に示したように球形の骨格を
形成する磁界検出素子３０ａ、３０ｂ、３０ｃの周囲を
包む絶縁体である。Reference numeral 3a is an insulator which surrounds the magnetic field detecting elements 30a, 30b and 30c forming a spherical skeleton as shown in FIG.
【００３２】ファントム１の表面の磁界の測定は、磁界
検出プローブ３をファントム１の表面に接するように表
面に沿って移動させながら行う。この移動は、図１に示
した歯車５、６、９を回転させることにより行う。The magnetic field on the surface of the phantom 1 is measured while moving the magnetic field detecting probe 3 along the surface of the phantom 1 so as to be in contact with the surface of the phantom 1. This movement is performed by rotating the gears 5, 6, 9 shown in FIG.
【００３３】このとき、ファントム１の存在による電磁
場の信号線Ｊへの影響があるので、ファントム１と磁界
検出プローブ３の接する点の反対側の対向する位置に信
号線Ｊが常にくるようにすることが望ましい。こうする
ことで、ファントム１の存在による電磁場の影響を少な
くするとともにこの影響を常に一定にすることができ
る。このように、常にファントム１と磁界検出プローブ
３の接する点の反対側に信号線Ｊがくるようにするため
にはアーム４に可撓性があることが望ましい。At this time, the presence of the phantom 1 affects the signal line J of the electromagnetic field, so that the signal line J is always located at the opposite position on the opposite side of the contact point between the phantom 1 and the magnetic field detection probe 3. Is desirable. By doing so, the influence of the electromagnetic field due to the existence of the phantom 1 can be reduced and the influence can be made constant at all times. In this way, it is desirable that the arm 4 be flexible so that the signal line J always comes to the opposite side of the point where the phantom 1 and the magnetic field detection probe 3 are in contact with each other.
【００３４】磁界検出プローブ３は、磁界検出素子３０
ａ、３０ｂ、３０ｃのそれぞれの導体が形成する円の中
心から表面までの長さが一定値ｄとなるように半径ｄの
球形になっているので、磁界検出プローブ３をファント
ム１の表面に沿って移動させることにより、磁界強度測
定点をファントム１から等距離ｄに保持することが容易
になる。The magnetic field detection probe 3 includes a magnetic field detection element 30.
Since the lengths from the center of the circle formed by the conductors a, 30b, and 30c to the surface have a constant value d, they are spherical with a radius d, so that the magnetic field detection probe 3 is placed along the surface of the phantom 1. By moving the phantom 1 with the phantom 1, it becomes easy to hold the magnetic field strength measurement point at an equal distance d.
【００３５】磁界検出素子３０ａ、３０ｂ、３０ｃは３
方向の磁界強度に応じた起電力を生じる。この起電力は
信号線Ｊを介して図１に示した電圧測定手段１１で測定
され、ＳＡＲ算出手段１２に入力される。The magnetic field detecting elements 30a, 30b, 30c are 3
An electromotive force corresponding to the magnetic field strength in the direction is generated. This electromotive force is measured by the voltage measuring means 11 shown in FIG. 1 via the signal line J and input to the SAR calculating means 12.
【００３６】ＳＡＲ算出手段１２では、入力された３方
向の磁界に応じた起電力から磁界強度を算出した後、磁
界強度平均値を算出し、磁界強度平均値の二乗値がＳＡ
Ｒに比例するということに基づいてＳＡＲを算出する。The SAR calculating means 12 calculates the magnetic field strength from the electromotive forces corresponding to the input magnetic fields in the three directions, then calculates the magnetic field strength average value, and the square value of the magnetic field strength average value is SA.
SAR is calculated based on being proportional to R.
【００３７】図８は本発明によるＳＡＲ測定装置の別の
実施例の斜視図である。図１と同じ構成部分には同じ参
照番号を付してある。FIG. 8 is a perspective view of another embodiment of the SAR measuring device according to the present invention. The same components as those in FIG. 1 are designated by the same reference numerals.
【００３８】磁界検出プローブ３とアーム４とは歯車５
を回転させることにより上下方向（ｚ軸方向）に動かす
ことができる。支柱１３と支柱１４とにはレール１５が
渡してあり、歯車６を回転させることにより磁界検出プ
ローブ３とアーム４と歯車５とを左右方向（ｒ軸方向）
に動かすことができる。支柱１３と支柱１４との間には
ターンテーブル１６が設けられており、その上にファン
トム１が固定されており、このターンテーブル１６が回
転することによりファントム１が回転（θ軸方向）でき
るようになっている。The magnetic field detection probe 3 and the arm 4 have a gear 5
Can be moved in the vertical direction (z-axis direction) by rotating. A rail 15 is passed between the columns 13 and 14, and the magnetic field detection probe 3, the arm 4, and the gear 5 are moved in the left-right direction (r-axis direction) by rotating the gear 6.
Can be moved to. A turntable 16 is provided between the columns 13 and 14, and the phantom 1 is fixed on the turntable 16 so that the phantom 1 can rotate (in the θ-axis direction) by rotating the turntable 16. It has become.
【００３９】本実施例においてＳＡＲを測定する手順
は、図１および図２に示した実施例の場合と同様なので
説明は省略する。The procedure for measuring the SAR in this embodiment is the same as that in the embodiment shown in FIGS. 1 and 2, and the description thereof is omitted.
【００４０】ところで、上記の実施例では磁界検出手段
として図３（ａ）に示した磁界検出素子を用いたが、本
発明はこれに限らず、ホール素子等の半導体素子を用い
て互いに直交する３方向の磁界強度を検出するようにし
てもよい。By the way, in the above embodiment, the magnetic field detecting element shown in FIG. 3A was used as the magnetic field detecting means, but the present invention is not limited to this, and semiconductor elements such as Hall elements are used to make them orthogonal to each other. The magnetic field strength in three directions may be detected.
【００４１】また、上記の実施例ではファントム１を固
定して磁界検出プローブ３を移動させたが、磁界検出プ
ローブ３を固定し、ファントム１を移動させてもよい。Although the phantom 1 is fixed and the magnetic field detection probe 3 is moved in the above embodiment, the magnetic field detection probe 3 may be fixed and the phantom 1 may be moved.
【００４２】[0042]
【発明の効果】以上説明したように、本発明によれば、
ファントムの上昇温度ではなく外部磁界の強度からＳＡ
Ｒを算出するので、携帯無線機の何倍もの放射電力の電
波を出力する測定用の電波発生装置などを特別に設ける
必要もなく、簡易な測定手法で且つ小さな測定誤差でＳ
ＡＲを測定することが可能となる。As described above, according to the present invention,
SA from the strength of the external magnetic field rather than the rising temperature of the phantom
Since R is calculated, there is no need to specially install a radio wave generator for measurement that outputs radio waves with radiated power many times that of a portable wireless device, and a simple measurement method with a small measurement error is used.
It becomes possible to measure AR.
【００４３】また、本発明によれば、互いに直交する３
方向の磁界強度を同時に測定することができるので、磁
界の測定を１回ですますことができ、測定が容易になる
とともに測定にかかる時間を短縮することができる。Further, according to the present invention, the three orthogonal
Since the magnetic field strengths in the directions can be measured at the same time, the magnetic field can be measured only once, facilitating the measurement and reducing the time required for the measurement.
【００４４】さらに、本発明によれば、磁界検出手段と
しての磁界検出プローブは、磁界検出素子の導体が形成
する円の中心、すなわち磁界測定点から磁界検出プロー
ブの表面までの長さが一定になるように、絶縁体で覆わ
れているので、ファントムからの距離が一定の点におけ
る磁界強度の測定が容易に行える。Further, according to the present invention, in the magnetic field detecting probe as the magnetic field detecting means, the center of the circle formed by the conductor of the magnetic field detecting element, that is, the length from the magnetic field measuring point to the surface of the magnetic field detecting probe is constant. As described above, since it is covered with an insulator, it is possible to easily measure the magnetic field strength at a point where the distance from the phantom is constant.
【００４５】さらにまた、本発明によれば、磁界検出プ
ローブからの信号線が常にファントムと磁界検出プロー
ブの接する点の反対側の対向する位置にくるように磁界
検出プローブを移動させることができるので、ファント
ムの存在による電磁場の磁界検出プローブからの信号線
への影響を少なくするとともに、この影響を常に一定に
することができ、測定値のばらつきを少なくすることが
できる。Furthermore, according to the present invention, the magnetic field detection probe can be moved so that the signal line from the magnetic field detection probe is always located at the opposite position on the opposite side of the contact point between the phantom and the magnetic field detection probe. The influence of the electromagnetic field on the signal line from the magnetic field detection probe due to the presence of the phantom can be reduced, and this influence can be made constant at all times, and the dispersion of the measured values can be reduced.
【図１】本発明によるＳＡＲ測定装置の一実施例の斜視
図である。FIG. 1 is a perspective view of an embodiment of a SAR measuring device according to the present invention.
【図２】本発明によるＳＡＲ測定装置のブロック図であ
る。FIG. 2 is a block diagram of a SAR measurement device according to the present invention.
【図３】図１に示した磁界検出プローブ内の磁界検出素
子を示し、（ａ）は１つの磁界検出素子の断面図であ
り、（ｂ）は磁界検出素子の（ａ）に示したＣ−Ｃ′断
面図である。3 shows a magnetic field detecting element in the magnetic field detecting probe shown in FIG. 1, (a) is a sectional view of one magnetic field detecting element, and (b) is a C shown in (a) of the magnetic field detecting element. It is a C'cross section.
【図４】磁界検出素子の導体が形成する円に対して垂直
方向に存在する電界の影響の説明図である。FIG. 4 is an explanatory diagram of an influence of an electric field existing in a direction perpendicular to a circle formed by a conductor of a magnetic field detection element.
【図５】磁界検出素子の導体が形成する円に対して垂直
方向に存在する磁界の影響の説明図である。FIG. 5 is an explanatory diagram of an influence of a magnetic field existing in a direction perpendicular to a circle formed by a conductor of a magnetic field detection element.
【図６】磁界検出プローブ内の磁界検出素子の配置の説
明図である。FIG. 6 is an explanatory diagram of the arrangement of magnetic field detection elements in the magnetic field detection probe.
【図７】図３（ａ）に示した磁界検出プローブを用いて
図１に示したファントムの外部磁界を測定する様子の説
明図である。7 is an explanatory diagram showing how the external magnetic field of the phantom shown in FIG. 1 is measured using the magnetic field detection probe shown in FIG.
【図８】本発明によるＳＡＲ測定装置の別の実施例の斜
視図である。FIG. 8 is a perspective view of another embodiment of the SAR measuring device according to the present invention.
１ ファントム ２ 携帯無線機 ３ 磁界検出プローブ ４ アーム ５、６、９ 歯車 ７ レール ８ 円柱形枠 １０ テーブル １１ 電圧測定手段 １２ ＳＡＲ算出手段 1 Phantom 2 Portable Radio Device 3 Magnetic Field Detection Probe 4 Arms 5, 6, 9 Gears 7 Rails 8 Cylindrical Frame 10 Table 11 Voltage Measuring Means 12 SAR Calculating Means
Claims (12)
等しい擬似生体模型と、 該擬似生体模型に固定された電磁波発生手段と、 前記擬似生体模型の周囲における前記電磁波発生手段に
よる磁界のうち互いに平行でない３以上の方向の磁界の
強度を測定する磁界検出手段と、 前記擬似生体模型と前記磁界検出手段との相対位置を互
いに平行でない３以上の方向に移動する移動手段とを備
えたことを特徴とするＳＡＲ測定装置。1. A pseudo biological model having the same permittivity and magnetic permeability as that of a living body such as a human body, an electromagnetic wave generating means fixed to the pseudo biological model, and a magnetic field generated by the electromagnetic wave generating means around the pseudo biological model. Magnetic field detecting means for measuring magnetic field strength in three or more directions not parallel to each other; and moving means for moving relative positions of the pseudo biological model and the magnetic field detecting means in three or more directions not parallel to each other. A SAR measuring device characterized by:
度に基づいて前記擬似生体模型の電磁波の吸収量を算出
するＳＡＲ算出手段をさらに備えたことを特徴とする請
求項１に記載のＳＡＲ測定装置。2. The SAR measurement device according to claim 1, further comprising SAR calculation means for calculating an electromagnetic wave absorption amount of the pseudo biological model based on the magnetic field strength obtained by the magnetic field detection means. apparatus.
方向の磁界強度を同時に測定するものであることを特徴
とする請求項１に記載のＳＡＲ測定装置。3. The magnetic field detecting means are orthogonal to each other.
The SAR measuring device according to claim 1, wherein the magnetic field strengths in the directions are simultaneously measured.
定されていることを特徴とする請求項１に記載のＳＡＲ
測定装置。4. The SAR according to claim 1, wherein the magnetic field detecting means is fixed to a rod-shaped insulator.
measuring device.
を特徴とする請求項４に記載のＳＡＲ測定装置。5. The SAR measuring device according to claim 4, wherein the rod-shaped insulator has flexibility.
ることを特徴とする請求項１に記載のＳＡＲ測定装置。6. The SAR measuring device according to claim 1, wherein the magnetic field detecting means is covered with an insulator.
号出力端子側が前記擬似生体模型と常に反対の位置にく
るように前記擬似生体模型または前記磁界検出手段を移
動するものであることを特徴とする請求項１に記載のＳ
ＡＲ測定装置。7. The moving means moves the pseudo biological model or the magnetic field detecting means such that a signal output terminal side of the magnetic field detecting means is always at a position opposite to the pseudo biological model. And S according to claim 1.
AR measuring device.
記磁界検出手段との相対位置を互いに直交する３方向に
移動するものであることを特徴とする請求項１に記載の
ＳＡＲ測定装置。8. The SAR measuring device according to claim 1, wherein the moving means moves the relative positions of the pseudo biological model and the magnetic field detecting means in three directions orthogonal to each other.
は人体の頭部を模した形状のいずれかであることを特徴
とする請求項１に記載のＳＡＲ測定装置。9. The SAR measuring device according to claim 1, wherein the pseudo biological model has any one of a cylindrical shape, a spherical shape, and a shape imitating a head of a human body.
載置し回転するターンテーブルを有することを特徴とす
る請求項１に記載のＳＡＲ測定装置。10. The SAR measuring apparatus according to claim 1, wherein the moving unit has a turntable on which the pseudo biological model is placed and rotated.
が等しい擬似生体模型と、 該擬似生体模型に固定された電磁波発生手段と、 前記擬似生体模型の周囲における前記電磁波発生手段に
よる磁界のうち互いに平行でない３以上の方向の磁界の
強度を測定する磁界検出手段と、 前記擬似生体模型と前記磁界検出手段との相対位置を互
いに平行でない３以上の方向に移動する移動手段とを用
いて、 前記磁界検出手段からの磁界強度に基づいて前記擬似生
体模型の電磁波の吸収量を算出するＳＡＲ測定方法。11. A pseudo biological model having the same permittivity and magnetic permeability as that of a living body such as a human body, an electromagnetic wave generating means fixed to the pseudo biological model, and a magnetic field generated by the electromagnetic wave generating means around the pseudo biological model. Using magnetic field detecting means for measuring magnetic field strengths in three or more directions that are not parallel to each other, and moving means for moving relative positions of the pseudo biological model and the magnetic field detecting means in three or more directions that are not parallel to each other, A SAR measuring method for calculating an electromagnetic wave absorption amount of the pseudo biological model based on the magnetic field intensity from the magnetic field detecting means.
３方向の磁界強度を同時に測定するものであることを特
徴とする請求項１１に記載のＳＡＲ測定方法。12. The SAR measuring method according to claim 11, wherein the magnetic field detecting means simultaneously measures magnetic field strengths in three directions orthogonal to each other.
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|---|---|---|---|
| JP5256418A JP2630222B2 (en) | 1993-09-20 | 1993-09-20 | SAR measuring device and measuring method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5256418A JP2630222B2 (en) | 1993-09-20 | 1993-09-20 | SAR measuring device and measuring method |
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| JP2008134218A (en) * | 2006-10-23 | 2008-06-12 | Ntt Docomo Inc | System and method for measuring specific absorption rate |
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| WO2015186160A1 (en) * | 2014-06-06 | 2015-12-10 | 東芝三菱電機産業システム株式会社 | A device for measuring 3d surface potential distribution |
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| CN106461707B (en) * | 2014-06-06 | 2019-03-05 | 东芝三菱电机产业系统株式会社 | Three-dimensional surface Potential distribution measuring device |
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