JPH0585849B2 - - Google Patents
Info
- Publication number
- JPH0585849B2 JPH0585849B2 JP2105221A JP10522190A JPH0585849B2 JP H0585849 B2 JPH0585849 B2 JP H0585849B2 JP 2105221 A JP2105221 A JP 2105221A JP 10522190 A JP10522190 A JP 10522190A JP H0585849 B2 JPH0585849 B2 JP H0585849B2
- Authority
- JP
- Japan
- Prior art keywords
- magnetostriction
- gauges
- relative displacement
- laser beam
- sample
- 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.)
- Expired - Lifetime
Links
- 238000006073 displacement reaction Methods 0.000 claims description 15
- 238000000034 method Methods 0.000 claims description 13
- 238000005259 measurement Methods 0.000 claims description 11
- 239000000463 material Substances 0.000 claims description 10
- 230000000694 effects Effects 0.000 claims description 7
- 238000000691 measurement method Methods 0.000 claims description 7
- 238000012545 processing Methods 0.000 claims description 4
- 230000000737 periodic effect Effects 0.000 claims 2
- 238000001514 detection method Methods 0.000 description 13
- 230000004907 flux Effects 0.000 description 12
- 230000005284 excitation Effects 0.000 description 9
- 239000000696 magnetic material Substances 0.000 description 8
- 229910001224 Grain-oriented electrical steel Inorganic materials 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 230000003287 optical effect Effects 0.000 description 3
- 230000010354 integration Effects 0.000 description 2
- 229920001342 Bakelite® Polymers 0.000 description 1
- 238000005773 Enders reaction Methods 0.000 description 1
- 229910000565 Non-oriented electrical steel Inorganic materials 0.000 description 1
- 239000004637 bakelite Substances 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000005415 magnetization Effects 0.000 description 1
- 239000013307 optical fiber Substances 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
Landscapes
- Measuring Magnetic Variables (AREA)
- Measurement Of Mechanical Vibrations Or Ultrasonic Waves (AREA)
Description
【発明の詳細な説明】
［産業上の利用分野］
本発明は、方向性電磁鋼板、無方向性電磁鋼板
等の磁性材料の磁歪特性を高精度に測定する方法
に関する。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for measuring magnetostrictive properties of magnetic materials such as grain-oriented electrical steel sheets and non-oriented electrical steel sheets with high precision.
［従来の技術］
磁界中に磁性材料が置かれ磁化されると伸びあ
るいは縮む磁歪現象がおこる。特に、磁性材料が
交流磁界中におかれ磁化される場合には磁化の変
化と共に伸縮するため磁界周波数に同期した磁歪
振動となり、振動ノズル源あるいは騒音の原因と
なることがある。近年、環境問題の高揚とともに
トランス、モーター、電磁弁等の磁気応用機器の
騒音を減少させることが社会的な要請となり、鉄
心に用いられる方向性電磁鋼板、無方向性電磁鋼
板等の鋼板材料、あるいはその他の磁性材料の磁
歪特性を改善することがひとつの開発課題となつ
ている。しかし、一般に磁歪による長さの変化率
は非常に小さく10-5程度であり、これらの磁歪特
性を精度よく測定することは従来困難であつた。[Prior Art] When a magnetic material is placed in a magnetic field and magnetized, a magnetostriction phenomenon occurs in which it expands or contracts. In particular, when a magnetic material is placed in an alternating current magnetic field and magnetized, it expands and contracts as the magnetization changes, resulting in magnetostrictive vibrations that are synchronized with the magnetic field frequency, which may cause a vibrating nozzle source or noise. In recent years, with the rise of environmental issues, there has been a social demand for reducing noise from magnetic equipment such as transformers, motors, and solenoid valves. Another development challenge is to improve the magnetostrictive properties of other magnetic materials. However, the rate of change in length due to magnetostriction is generally very small, on the order of 10 -5 , and it has traditionally been difficult to accurately measure these magnetostrictive properties.
従来、方向性電磁鋼板等の磁性材料の磁歪特性
測定には、交流磁界中に置いた材料の一端を固定
しておき、他端に取り付けられた検出機構を介し
て差動トランスにより振動変位量を検出する方法
の装置が用いられてきた。しかし、この方法の装
置では、材料と差動トランスの間の検出機構の振
動伝達特性により検出される振動変位量が変化す
る現象や、検出機構の振動共振モード特性によつ
ては磁歪振動に検出機構自身の振動が重畳する現
象が起こる。このため、同一材料であつても検出
機構の材料への取付方法の微妙な違いにより測定
される磁歪特性結果が異なり、再現性を得ること
が困難であつた。 Conventionally, to measure the magnetostrictive characteristics of magnetic materials such as grain-oriented electrical steel sheets, one end of the material placed in an alternating magnetic field is fixed, and a differential transformer is used to detect the amount of vibration displacement via a detection mechanism attached to the other end. Devices have been used to detect . However, with this method, the amount of vibration displacement detected changes due to the vibration transfer characteristics of the detection mechanism between the material and the differential transformer, and magnetostrictive vibrations may be detected depending on the vibration resonance mode characteristics of the detection mechanism. A phenomenon occurs in which the vibrations of the mechanism itself are superimposed. For this reason, even if the materials are the same, the results of the measured magnetostriction characteristics differ due to subtle differences in the method of attaching the detection mechanism to the material, making it difficult to obtain reproducibility.
［発明が解決しようとする課題］
本発明は、従来の交流磁歪測定装置の磁歪振動
を精度よく検出するのが困難という問題点を解決
し、磁性材料の磁歪特性を高精度かつ再現性よく
測定可能な方法を提供することにある。[Problems to be Solved by the Invention] The present invention solves the problem that it is difficult to accurately detect magnetostrictive vibrations in conventional AC magnetostriction measuring devices, and measures the magnetostrictive properties of magnetic materials with high precision and reproducibility. The goal is to provide a possible method.
［課題を解決するための手段］
本発明に先立ち、従来の交流磁歪測定装置の測
定誤差要因を詳細に検討した。主な誤差要因とし
て、装置の外部からの振動ノイズの影響、装置構
造物の共振現象、材料からの漏れ磁束が材料近傍
の他の磁性材料に流れることによる磁気吸引力に
よる振動、検出機構による振動伝達障害、等な考
えられた。個々の要因について測定へに影響を調
べた結果、検出機構による誤差要因がもつとも影
響が大きいことがわかつた。材料の磁歪振動を正
確に差動トランスに伝達するためには検出機構
に、剛性の強さ、軽量さ、抵抗のない支持方法、
共振を起こさない形状、材料に歪を与えない取り
付け方法、等が要求されるが、これらを同時に満
足することは非常に困難であつた。[Means for Solving the Problems] Prior to the present invention, measurement error factors of conventional AC magnetostriction measurement devices were studied in detail. The main error factors are the influence of vibration noise from outside the device, resonance phenomena of the device structure, vibrations due to magnetic attraction force caused by magnetic flux leaking from the material flowing into other magnetic materials near the material, and vibrations caused by the detection mechanism. It was thought that there was a transmission disorder, etc. As a result of examining the influence of each factor on measurement, it was found that the error factor caused by the detection mechanism had a large influence. In order to accurately transmit the magnetostrictive vibrations of the material to the differential transformer, the detection mechanism must have high rigidity, light weight, a support method that eliminates resistance,
A shape that does not cause resonance, a mounting method that does not distort the material, etc. are required, but it has been extremely difficult to satisfy these requirements at the same time.
本発明では、上述した検出機構による磁歪測定
誤差を基本的に取り除くため、磁歪振動を伝達す
る検出機構を省略した磁歪測定方法を検討し、振
動測定に従来の差動トランス法に代わり、非接触
振動測定法を採用することが最も効果的であるこ
とを見いだした。非接触による振動測定法には、
電極間の距離による電気容量の変化に着目し、静
電容量法、反射面に斜め入射させたレーザ光の反
射光の位置の距離による変化に着目したレーザ変
位計法、反射面の移動速度によりレーザ反射光の
波長が変化するドツプラー効果に着目したレーザ
ドツプラー振動計法がある。これらの非接触振動
測定法の磁歪測定への適用を検討した結果、微小
振動の検出感度の高さ、高速応答性、計測周波数
範囲の広さ、相対振動が計測可能なことから、レ
ーザドツプラー振動計を用いることが最適である
ことを見いだした。 In the present invention, in order to basically eliminate the magnetostriction measurement error caused by the above-mentioned detection mechanism, we investigated a magnetostriction measurement method that omitted the detection mechanism that transmits magnetostriction vibrations, and used a non-contact method for vibration measurement instead of the conventional differential transformer method. We found that adopting the vibration measurement method was the most effective. Non-contact vibration measurement methods include:
The capacitance method focuses on the change in capacitance due to the distance between the electrodes, the laser displacement meter method focuses on the change in the position of the reflected light of the laser beam obliquely incident on the reflective surface, and the moving speed of the reflective surface. There is a laser Doppler vibrometer method that focuses on the Doppler effect in which the wavelength of laser reflected light changes. As a result of considering the application of these non-contact vibration measurement methods to magnetostriction measurement, we found that laser Doppler has high detection sensitivity for minute vibrations, high speed response, wide measurement frequency range, and ability to measure relative vibrations. We found that using a vibration meter is optimal.
本発明の基本的構成の一例を第１図に示す。図
中の１はサンプルを示し、サンプル１の一端は固
定端であり、サンプル固定治具１０でベースプレ
ート１１に固定されている。サンプル１の他の一
端は自由端であり、レーザドツプラー振動計のセ
ンサーヘツド２からレーザ光束１３がサンプルの
両端を結ぶ軸に平行に入射する。一方、センサー
ヘツド３からはレーザ光束１４がベースプレート
１１に固定された反射器１２に入射している。レ
ーザドツプラー振動計シグナルプロセツサ４はセ
ンサーヘツド２およびセンサーヘツド３で検出さ
れたレーザ反射光のドツプラー効果による周波数
変位差を検出し、サンプルの自由端と固定端との
相対変位速度を検出する。相対変位速度信号は積
分器５で積分処理により磁歪振動信号に変換さ
れ、オシロスコープ７のＹ軸に入力される。一
方、サンプル１は励磁コイル１５に接続された励
磁電源９により励磁され、磁束検出コイル１６の
起電力をプリアンプ８で増幅し積分器６で積分処
理することのよりサンプル１を通る磁束量信号と
して、オシロスコープのＸ軸に入力される。オシ
ロスコープ７のデイスプレイには、磁歪信号と磁
束信号のリサージユ図形が出力される。第２図は
レーザドツプラー振動計の光学系の一例を示す。
図中、２１はレーザ発振器、２２，２３はビーム
スプリツタ、２４，２５は偏光ビームスプリツ
タ、２６はブラツグセル、２７，２８は光検出
器、２９，３０は偏光面保存光フアイバーであ
る。第２図はデユアルビームタイプのマツハツエ
ンダー干渉計を原理とした振動計の例であるが、
レーザドツプラー効果を用いた振動計であれば他
の光学系であつてもよい。 An example of the basic configuration of the present invention is shown in FIG. 1 in the figure indicates a sample, and one end of the sample 1 is a fixed end, and is fixed to a base plate 11 with a sample fixing jig 10. The other end of the sample 1 is a free end, and a laser beam 13 from the sensor head 2 of the laser Doppler vibrometer is incident parallel to the axis connecting both ends of the sample. On the other hand, a laser beam 14 from the sensor head 3 is incident on a reflector 12 fixed to a base plate 11. The laser Doppler vibrometer signal processor 4 detects the frequency displacement difference due to the Doppler effect of the laser reflected light detected by the sensor head 2 and the sensor head 3, and detects the relative displacement speed between the free end and fixed end of the sample. . The relative displacement velocity signal is converted into a magnetostrictive vibration signal by an integrator 5 through integration processing, and is input to the Y axis of an oscilloscope 7. On the other hand, the sample 1 is excited by the excitation power supply 9 connected to the excitation coil 15, and the electromotive force of the magnetic flux detection coil 16 is amplified by the preamplifier 8 and integrated by the integrator 6, thereby generating a magnetic flux amount signal passing through the sample 1. , is input to the X-axis of the oscilloscope. A Lissage figure of the magnetostrictive signal and the magnetic flux signal is output on the display of the oscilloscope 7. FIG. 2 shows an example of the optical system of a laser Doppler vibrometer.
In the figure, 21 is a laser oscillator, 22 and 23 are beam splitters, 24 and 25 are polarizing beam splitters, 26 is a Bragg cell, 27 and 28 are photodetectors, and 29 and 30 are polarization-maintaining optical fibers. Figure 2 is an example of a vibration meter based on the dual beam type Matsuhatsu Ender interferometer.
Other optical systems may be used as long as the vibration meter uses the laser Doppler effect.
第３図は本発明の基本的構成のもうひとつの例
を示す。レーザドツプラー振動計センサーヘツド
２，３はベースプレート４６に支持されているサ
ンプル１の２標点上にレーザ光反射器４０，４１
が設置されている。レーザ光反射器４０，４１の
反射面の振動がサンプル１の設置点の振動と線形
的な関係となるよう、レーザ光反射器４０，４１
をサンプル１へ設置する。レーザドツプラー振動
計のセンサーヘツド２，３からレーザ光反射器４
０，４１へ入射するレーザ光束１３，１４は、前
述の２標点間を結ぶ軸に平行でかつ同じ方向から
入射する必要がある。レーザ光反射器４０，４１
からの反射光は、ミラー４２，４３を経てレーザ
ドツプラー振動計センサーヘツド２，３に入射す
る。レーザドツプラー振動計シグナルプロセツサ
４はセンサーヘツド２およびセンサーヘツド３で
検出されたレーザ反射光のドツプラー効果による
周波数変位差を検出し、サンプル１の２標点間の
相対変位速度を検出する。相対変位速度信号は積
分器５で積分処理により磁歪振動信号に変換さ
れ、オシロスコープ７のＹ軸に入力される。一
方、サンプル１は励磁コイル１５に接続された励
磁電源９により励磁され、磁束検出コイル１６の
起電力をプリアンプ８で増幅し積分器６で積分処
理することによりサンプル１を通る磁束量信号と
して、オシロスコープのＸ軸に入力される。オシ
ロスコープ７のデイスプレイには、磁歪信号と磁
束信号のリサージユ図形が出力される。 FIG. 3 shows another example of the basic configuration of the present invention. The laser Doppler vibrometer sensor heads 2 and 3 have laser light reflectors 40 and 41 on two gauge points of the sample 1 supported on a base plate 46.
is installed. The laser beam reflectors 40, 41 are arranged so that the vibrations of the reflecting surfaces of the laser beam reflectors 40, 41 have a linear relationship with the vibrations of the installation point of the sample 1.
is installed on sample 1. From the sensor heads 2 and 3 of the laser Doppler vibrometer to the laser light reflector 4
The laser beams 13 and 14 that are incident on the points 0 and 41 need to be parallel to the axis connecting the two gauge points mentioned above and should be incident from the same direction. Laser light reflector 40, 41
The reflected light from the laser beam passes through mirrors 42 and 43 and enters the laser Doppler vibrometer sensor heads 2 and 3. The laser Doppler vibrometer signal processor 4 detects the frequency displacement difference due to the Doppler effect of the laser reflected light detected by the sensor head 2 and the sensor head 3, and detects the relative displacement speed between the two gauge points of the sample 1. The relative displacement velocity signal is converted into a magnetostrictive vibration signal by an integrator 5 through integration processing, and is input to the Y axis of an oscilloscope 7. On the other hand, the sample 1 is excited by the excitation power supply 9 connected to the excitation coil 15, and the electromotive force of the magnetic flux detection coil 16 is amplified by the preamplifier 8 and integrated by the integrator 6, thereby generating a magnetic flux amount signal passing through the sample 1. Input to the X axis of the oscilloscope. A Lissage figure of the magnetostrictive signal and the magnetic flux signal is output on the display of the oscilloscope 7.
［実施例］
第３図にブロツク図を示した測定装置を製作
し、方向性電磁鋼板をサンプルとして磁歪特性を
測定した。サンプルの寸法は100mm×500mm×0.23
mmであり、圧延方向が長手方向である。サンプル
の両端は励磁によりサンプル内に発生する反磁界
を減少させるため、ヨークに接触させて帰磁路を
形成させた。励磁コイル両端外側のサンプル上２
標点にレーザ光反射器を設置した。レーザ光反射
器はレーザ反射面にレーザ反射テープを貼つた５
mm立方のベークライトであり、サンプル表面に接
着固定した。サンプルは正弦波電圧出力の交流励
磁電源で励磁した。磁歪信号と磁束信号はデジタ
ルタイプのオシロスコープに入力し、64回の平均
化処理を行い騒音を軽減させた。[Example] A measuring device whose block diagram is shown in FIG. 3 was manufactured, and magnetostriction characteristics were measured using a grain-oriented electrical steel sheet as a sample. Sample dimensions are 100mm x 500mm x 0.23
mm, and the rolling direction is the longitudinal direction. Both ends of the sample were brought into contact with a yoke to form a return path in order to reduce the demagnetizing field generated within the sample due to excitation. Sample top 2 on the outside of both ends of the excitation coil
A laser beam reflector was installed at the gauge point. The laser beam reflector is made by pasting laser reflective tape on the laser reflecting surface5.
It was Bakelite of mm cubic size and was adhesively fixed to the sample surface. The sample was excited by an AC excitation power supply with a sinusoidal voltage output. The magnetostrictive signal and magnetic flux signal were input to a digital oscilloscope and averaged 64 times to reduce noise.
製作した装置による磁歪測定結果の一例を第４
図に示す。図は最大磁束密度1.9Tにおける測定
結果を示すオシロスコープのデイスプレイを写真
撮影したものであり、磁束密度と横軸とし磁歪を
縦軸としたリサージユ図形である。 An example of magnetostriction measurement results using the fabricated device is shown in the fourth section.
As shown in the figure. The figure is a photograph of an oscilloscope display showing the measurement results at a maximum magnetic flux density of 1.9T, and is a Lissage figure with magnetic flux density as the horizontal axis and magnetostriction as the vertical axis.
［発明の効果］
以上説明したように、本発明によれば交流磁界
中で磁化された磁性材料の交流磁歪特性を従来法
に比べ著しく精度よく測定できる。[Effects of the Invention] As described above, according to the present invention, the AC magnetostriction characteristics of a magnetic material magnetized in an AC magnetic field can be measured with significantly higher accuracy than conventional methods.
第１図は本発明の基本的構成の一例を示したブ
ロツク図である。第２図はレーザドツプラー振動
計の光学系の一例を示したものである。第３図は
本発明の基本的構成のもうひとつの例を示したブ
ロツク図である。第４図は実施例における方向性
電磁鋼板の磁歪測定結果の一例を示したものであ
る。
１……サンプル、２，３……レーザドツプラー
振動計センサーヘツド、４……レーザドツプラー
振動計シグナルプロセツサ、５，６……積分器、
７……オシロスコープ、８……プリアンプ、９…
…励磁電源、１０……サンプル固定治具、１１…
…ベースプレート、１２……固定反射器、１３，
１４……レーザ光束、１５……励磁コイル、１６
……磁束検出コイル。
FIG. 1 is a block diagram showing an example of the basic configuration of the present invention. FIG. 2 shows an example of the optical system of a laser Doppler vibrometer. FIG. 3 is a block diagram showing another example of the basic configuration of the present invention. FIG. 4 shows an example of the magnetostriction measurement results of grain-oriented electrical steel sheets in Examples. 1... Sample, 2, 3... Laser Doppler vibrometer sensor head, 4... Laser Doppler vibrometer signal processor, 5, 6... Integrator,
7...Oscilloscope, 8...Preamplifier, 9...
...Excitation power supply, 10...Sample fixing jig, 11...
... Base plate, 12 ... Fixed reflector, 13,
14... Laser beam flux, 15... Excitation coil, 16
...Magnetic flux detection coil.
Claims (1)
的な相対変位量を測定する交流磁歪測定方法にお
いて、１標点を固定し他の１標点に２標点をむす
ぶ軸と平行にレーザ光束を入射し、反射光のドツ
プラー効果による周波数変化から２標点間の相対
変位速度を検出しさらに積分演算処理により２標
点間の相対変位量を測定することを特徴とする交
流磁歪測定方法。 ２ 交流磁歪中におかれた材料の２標点間の周期
的な相対変位量を測定する交流磁歪測定方法にお
いて、２標点にそれぞれ２標点をむすぶ軸と平行
かつ同じ方向にレーザ光束を入射し、それぞれの
反射光のドツプラー効果による周波数変化差から
２標点間の相対変位速度を検出しさらに積分演算
処理により２標点間の相対変位量を測定すること
を特徴とする交流磁歪測定方法。 ３ 標点位置にレーザ光の反射器を設置し、これ
にレーザ光を入射することを特徴とする、請求項
１または２記載の交流磁歪測定方法。[Claims] 1. In an AC magnetostriction measurement method that measures the periodic relative displacement between two gauge points of a material placed in AC magnetostriction, one gauge point is fixed and two gauge points are set at another gauge point. Injecting a laser beam parallel to the axis connecting the points, detecting the relative displacement speed between the two gauges from the frequency change due to the Doppler effect of the reflected light, and then measuring the relative displacement between the two gauges by integral calculation processing. An AC magnetostriction measurement method characterized by: 2. In the AC magnetostriction measurement method that measures the periodic relative displacement between two gauges of a material placed in AC magnetostriction, a laser beam is applied to each of the two gauges parallel to and in the same direction as the axis connecting the two gauges. AC magnetostriction measurement characterized by detecting the relative displacement speed between two gauges from the frequency change difference due to the Doppler effect of the incident and reflected light, and further measuring the relative displacement between the two gauges by integral calculation processing. Method. 3. The alternating current magnetostriction measuring method according to claim 1 or 2, characterized in that a laser beam reflector is installed at the gauge point position and the laser beam is incident on the reflector.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10522190A JPH045524A (en) | 1990-04-23 | 1990-04-23 | Alternating current magneto-striction measuring method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10522190A JPH045524A (en) | 1990-04-23 | 1990-04-23 | Alternating current magneto-striction measuring method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH045524A JPH045524A (en) | 1992-01-09 |
| JPH0585849B2 true JPH0585849B2 (en) | 1993-12-09 |
Family
ID=14401614
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP10522190A Granted JPH045524A (en) | 1990-04-23 | 1990-04-23 | Alternating current magneto-striction measuring method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH045524A (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5736634B2 (en) * | 2008-03-04 | 2015-06-17 | 新日鐵住金株式会社 | Evaluation method of magnetostriction or noise of magnetic steel sheet for three-phase transformer core excited by sine wave |
| JP5631344B2 (en) * | 2012-02-27 | 2014-11-26 | 大分県 | Magnetostriction measuring method and magnetostriction measuring apparatus |
| EP3770281B1 (en) | 2018-03-22 | 2023-05-10 | Nippon Steel Corporation | Grain-oriented electrical steel sheet and method for producing grain-oriented electrical steel sheet |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4919872A (en) * | 1972-05-26 | 1974-02-21 | ||
| JPS5421112A (en) * | 1977-07-18 | 1979-02-17 | Kee Ii Dei Kk | Information transmission system to running vehicle |
| JPS5924275A (en) * | 1982-08-02 | 1984-02-07 | Sumitomo Special Metals Co Ltd | Method and apparatus for measuring magnetostriction |
| JPS6263802A (en) * | 1985-09-13 | 1987-03-20 | Rikagaku Kenkyusho | Optical measuring method for physical quantity |
-
1990
- 1990-04-23 JP JP10522190A patent/JPH045524A/en active Granted
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4919872A (en) * | 1972-05-26 | 1974-02-21 | ||
| JPS5421112A (en) * | 1977-07-18 | 1979-02-17 | Kee Ii Dei Kk | Information transmission system to running vehicle |
| JPS5924275A (en) * | 1982-08-02 | 1984-02-07 | Sumitomo Special Metals Co Ltd | Method and apparatus for measuring magnetostriction |
| JPS6263802A (en) * | 1985-09-13 | 1987-03-20 | Rikagaku Kenkyusho | Optical measuring method for physical quantity |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH045524A (en) | 1992-01-09 |
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