JPH0465333B2 - - Google Patents
Info
- Publication number
- JPH0465333B2 JPH0465333B2 JP58096700A JP9670083A JPH0465333B2 JP H0465333 B2 JPH0465333 B2 JP H0465333B2 JP 58096700 A JP58096700 A JP 58096700A JP 9670083 A JP9670083 A JP 9670083A JP H0465333 B2 JPH0465333 B2 JP H0465333B2
- Authority
- JP
- Japan
- Prior art keywords
- detector
- moving piece
- measuring device
- displacement measuring
- magnetic force
- 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
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Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N11/00—Investigating flow properties of materials, e.g. viscosity, plasticity; Analysing materials by determining flow properties
- G01N11/10—Investigating flow properties of materials, e.g. viscosity, plasticity; Analysing materials by determining flow properties by moving a body within the material
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- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Length Measuring Devices With Unspecified Measuring Means (AREA)
- Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)
Description
【発明の詳細な説明】
(イ) 発明の目的
本発明は運動片型の粘度計のうちで、検知子で
ある運動片を支持機構を介さずに浮揚、運動させ
る粘度計に関するものである。DETAILED DESCRIPTION OF THE INVENTION (A) Object of the Invention The present invention relates to a moving piece type viscometer in which a moving piece serving as a detector is levitated and moved without a support mechanism.
運動片型の粘度計では検知子である運動片の一
部または全体が被測定流体中に埋没して運動す
る。この運動片は被測定流体からその粘弾性特性
に応じた抗力を受ける。被測定流体の粘性や粘弾
性の測定は一般には運動片に加わる力と運動片の
変位との関係に基づいて行われる。従来より検知
子である運動片を支持するための機構としては、
ばねやピボツト軸や摺動型軸受が用いられてい
る。ゲル状の高粘弾性の物質では運動片を被測定
物中に圧入することもある。しかし、ばねやピボ
ツド軸や摺動型軸受の場合には、機械的構造が複
雑となるし、運動片も小型化が困難である。また
圧入する場合には測定中に運動片が偏位して容器
壁と接触しやすい。 In a moving piece type viscometer, a part or whole of the moving piece serving as a detector moves while being buried in the fluid to be measured. This moving piece receives a drag force from the fluid to be measured depending on its viscoelastic properties. The viscosity or viscoelasticity of a fluid to be measured is generally measured based on the relationship between the force applied to a moving piece and the displacement of the moving piece. Conventionally, the mechanism for supporting the moving piece that is the detector is as follows:
Springs, pivot shafts, and sliding bearings are used. In the case of a gel-like highly viscoelastic substance, the moving piece may be forced into the object to be measured. However, in the case of springs, pivot shafts, and sliding type bearings, the mechanical structure is complicated, and it is difficult to miniaturize the moving pieces. In addition, when press-fitting, the moving piece is likely to be deflected and come into contact with the container wall during measurement.
本発明の目的はこれらの重大な欠点を解決する
もので、本発明は次のような効果、利点を有す
る。 The purpose of the present invention is to solve these serious drawbacks, and the present invention has the following effects and advantages.
検知子の機械的支持機構が無い。したがつて
極く微小な検知子が使用可能で、支持機構の調
整と手間が不要である。試料を検知子とともに
容器内に密封したまま測定でき、試料容器とと
もに検知子も使い捨て可能で、試料の交換が容
易で、残留試料による汚染が無い。支持機構に
起因する故障がなく耐久性がある。 There is no mechanical support mechanism for the detector. Therefore, an extremely small detector can be used, and adjustment and effort of a support mechanism are unnecessary. The sample can be measured while being sealed in the container together with the detector, the detector can be disposable together with the sample container, the sample can be easily replaced, and there is no contamination from residual sample. It is durable with no failures caused by the support mechanism.
微小な検知子が使用できる。したがつて高い
周波数まで検知子たる運動片の質量の影響によ
る誤差が少なく、微量の試料でも測定できる。 Small detectors can be used. Therefore, up to high frequencies, there is little error due to the influence of the mass of the moving piece that is the detector, and even a minute amount of sample can be measured.
検知子が容器と接触せず支持機構の影響を受
けない。したがつて低い粘弾性の試料でも測定
誤差が少ない。 The detector does not come into contact with the container and is not affected by the support mechanism. Therefore, even samples with low viscoelasticity have little measurement error.
(ロ) 発明の構成
本発明に係る粘度計あるいは粘弾性計またはレ
オメーターは、検知子運動片に作用する力とその
変位との関係から試料の流体または粘弾性体の粘
性や粘弾性を測定するものであるが、特に検知子
と相対運動する被測定流体または粘弾性体に対し
て、機械的支持構造によらずサーボ機構を介して
磁力により、検知子を非接触無支持で浮揚させ目
標の位置または運動に制御することを特徴として
いる。以下、本発明に係る一実施例について図面
を参照しながら説明する。(B) Structure of the Invention The viscometer, viscoelasticity meter, or rheometer according to the present invention measures the viscosity or viscoelasticity of a sample fluid or viscoelastic body from the relationship between the force acting on a moving detector piece and its displacement. However, in particular, for fluids to be measured or viscoelastic bodies that move relative to the detector, the detector is levitated by magnetic force through a servo mechanism without using a mechanical support structure, in a non-contact and unsupported manner. It is characterized by controlling the position or movement of. Hereinafter, one embodiment of the present invention will be described with reference to the drawings.
第１図は装置主要部の機構説明図である。磁極
１，２は円柱体の一端が円錐台状に細くなつた強
磁性体例えば軟鉄製でコイル３，４が円柱の部分
に巻かれ鉛直方向、上下に向かい合う一対の電磁
石を構成する。両磁極に挟まれて合成樹脂製の透
明箱型の試料容器７が固定され置かれている。試
料容器７の中には試料である被測定流体５ととも
に検知子運動片６としての微小鉄球が密封されて
いる。検知子運動片６は磁極１，２により駆動さ
れる。光源８は白熱電球で検知子運動片６を照明
する。変位測定装置９としての光学的変位測定装
置は、検知子運動片６である鉄球の像を捕らえ、
像の辺縁の明暗の境界の位置を検知し位置に比例
した信号電圧を出力する。 FIG. 1 is a mechanical explanatory diagram of the main parts of the device. The magnetic poles 1 and 2 are made of a ferromagnetic material, such as soft iron, with one end of a cylindrical body tapered into a truncated cone shape, and coils 3 and 4 are wound around the cylindrical part to form a pair of electromagnets facing each other in the vertical direction. A transparent box-shaped sample container 7 made of synthetic resin is fixed and placed between both magnetic poles. In the sample container 7, a micro iron ball as a moving detector piece 6 is sealed together with a fluid to be measured 5 as a sample. The detector moving piece 6 is driven by the magnetic poles 1 and 2. A light source 8 illuminates the detector moving piece 6 with an incandescent bulb. The optical displacement measuring device as the displacement measuring device 9 captures an image of the iron ball which is the detector moving piece 6,
It detects the position of the boundary between brightness and darkness at the edge of the image and outputs a signal voltage proportional to the position.
第２図は装置の電気回路の主要構成図である。
検知子運動片６を駆動し浮揚させる吸引磁力はコ
イル３，４それぞれに接続された線形的特性を持
つ直流電力増幅器１７，１８から供給される駆動
電流により生じる。磁力は駆動電流の大小により
調節される。直流電力増幅器１７，１８として
は、予め設定した一定のバイアス電流と入力信号
電圧に比例した電流とを重畳した電流が出力とな
るような通常の直流電力増幅器を用いればよい。
バイアス電流を重畳する目的はコイル３，４それ
ぞれを流れる電流の向きを固定し、駆動磁力を駆
動電流に比例させるためである。目標位置を示す
波形発生装置１４からの信号電圧に追随して、検
知子運動片６を浮揚させ目標の運動をさせるため
のサーボ機構は次のような構成である。変位測定
装置９の出力信号電圧の極性は例えば検知子運動
片６の上向き変位に対して正の信号電圧を出力す
るように選んでおく。この検知子運動片６の位置
信号の電圧と波形発生器１４からの目標位置信号
である比較基準電圧とを演算増幅器１５が比較
し、両者の差である偏差電圧に比例した信号電圧
を出力する。この偏差信号電圧は補償回路１６を
経て直流電力増幅器１７に逆位相、直流電力増幅
器１８には正位相で入力される。直流電力増幅器
１７と１８とは入力信号の位相が逆なのでコイル
３とコイル４とでは流れる電流に差を生じ、検知
子運動片６の位置を修正して目標位置に近づけ偏
差電圧をゼロにしようとする向きに磁力が働く。
補償回路１６は例えば比例、微分、積分演算回路
からなりサーボ系の応答性、安定性を向上させ
る。 FIG. 2 is a main configuration diagram of the electric circuit of the device.
The attractive magnetic force that drives and levitates the detector moving piece 6 is generated by drive currents supplied from DC power amplifiers 17 and 18 having linear characteristics connected to the coils 3 and 4, respectively. The magnetic force is adjusted by the magnitude of the drive current. As the DC power amplifiers 17 and 18, normal DC power amplifiers whose output is a current obtained by superimposing a preset constant bias current and a current proportional to the input signal voltage may be used.
The purpose of superimposing the bias current is to fix the direction of the current flowing through each of the coils 3 and 4, and to make the driving magnetic force proportional to the driving current. The servo mechanism for levitating the detector moving piece 6 and causing it to move in a targeted manner following the signal voltage from the waveform generator 14 indicating the target position has the following configuration. The polarity of the output signal voltage of the displacement measuring device 9 is selected so as to output a positive signal voltage in response to upward displacement of the detector moving piece 6, for example. The operational amplifier 15 compares the voltage of the position signal of the detector moving piece 6 with a comparison reference voltage which is the target position signal from the waveform generator 14, and outputs a signal voltage proportional to the deviation voltage which is the difference between the two. . This deviation signal voltage is input to the DC power amplifier 17 with an opposite phase through the compensation circuit 16, and is input into the DC power amplifier 18 with a positive phase. Since the phases of the input signals of the DC power amplifiers 17 and 18 are opposite, a difference occurs in the current flowing between the coils 3 and 4, and the position of the detector moving piece 6 is corrected to bring it closer to the target position and make the deviation voltage zero. Magnetic force acts in the direction.
The compensation circuit 16 includes, for example, a proportional, differential, and integral calculation circuit, and improves the responsiveness and stability of the servo system.
実際の測定時に検知子運動片６が無支持で被測
定流体５中に浮揚している状態について本実施例
で説明する。ある瞬間の検知子運動片６の目標位
置を設定するには波形発生器１４の比較基準電圧
を検知子運動片６の位置に相当する値に設定す
る。例えばある正弦振動をさせたいならば、その
目標とする周波数、振幅の正弦波形信号電圧を波
形発生装置１４で発生させればよい。そして今仮
に検知子運動片６の位置が目標位置にあり変位測
定装置９の出力電圧と波形発生器１４からの信号
電圧との差がゼロならば、予め直流電力増幅器１
７，１８内に等しい値で設定されたバイアス電流
が駆動電流としてコイル３，４に流れて検知子運
動片６には上下磁極１，２双方から等しい吸引磁
力が作用する。したがつて運動片は静止したまま
である。次に検知子運動片６の位置が目標の位置
より下方にあつて変位測定装置９からの信号電圧
が目標値よりも低く、したがつて波形発生装置１
４の信号電圧との偏差が負であつたとしよう。こ
のときは演算増幅器１５から直流電力増幅器１
７，１８へ負の信号電圧が印加され、直流電力増
幅器１７の出力電流は増加し直流電力増幅器１８
の出力電流は減少して、上側にある磁極１の吸引
力が増加し下側にある磁極２の吸引力は減少して
検知子運動片６は上昇する。逆に検知子運動片６
が目標位置より上方にあれば上側の磁極１の吸引
力は弱まり下方の磁極２の吸引力が強まつて検知
子運動片６は下降する。通常の駆動状態では常に
検知子運動片６に下向きの重力が作用しているの
で下の磁極２の吸引力は重力分だけ弱い状態で上
の磁極１の吸引力と平衡する。測定中は通常、検
知子運動片６は変位測定装置９の測定範囲の中央
位置付近で浮揚、運動させるが、非測定中には検
知子運動片６は重量のみが作用するので試料容器
の底に沈んでいて目標の位置よりも下方にある。
したがつて測定開始時、電源を接続した瞬間には
検知子運動片６を上方へ引き上げるような磁力が
働く。そして検知子運動片６が目標の位置近くま
で上昇したら、定常的な浮揚、運動状態を開始す
る。被測定流体の粘弾性値は磁力と検知子の変位
との関係から算出する。磁力の直接測定は難しい
ので磁力はコイル３の電圧測定端子１０，１１間
の電圧から求めた電流とコイル４の電圧測定端子
１３，１２間の電圧から求めた電流とから推定さ
れる。検知子運動片６の変位は変位測定器９で測
定される。電流からの磁力算出比例式の校正は検
知子運動片６を被測定流体５中で磁極１，２間の
中央の位置に静止浮揚させたときの検知子運動片
６に作用する重力加速度を基準にして行う。粘弾
性の算出は、検知子運動片６が球形で上下方向に
正弦振動する場合にはストークスの法則を近似的
に適用し、蓄積弾性率（storage modulus）G′、
動的損失（loss modulus）G″を求める。 In this embodiment, a state in which the detector moving piece 6 is floating unsupported in the fluid 5 to be measured during actual measurement will be described. To set the target position of the detector moving piece 6 at a certain moment, the comparison reference voltage of the waveform generator 14 is set to a value corresponding to the position of the detector moving piece 6. For example, if a certain sine vibration is desired, the waveform generator 14 may generate a sine waveform signal voltage having the target frequency and amplitude. Now, if the position of the detector moving piece 6 is at the target position and the difference between the output voltage of the displacement measuring device 9 and the signal voltage from the waveform generator 14 is zero, then the DC power amplifier 1
Bias currents set at equal values in 7 and 18 flow as drive currents to coils 3 and 4, and equal attractive magnetic force acts on detector moving piece 6 from both upper and lower magnetic poles 1 and 2. The moving piece therefore remains stationary. Next, when the position of the detector moving piece 6 is below the target position, the signal voltage from the displacement measuring device 9 is lower than the target value, and therefore the waveform generator 1
Suppose that the deviation from the signal voltage of 4 is negative. At this time, from the operational amplifier 15 to the DC power amplifier 1
7 and 18, the output current of the DC power amplifier 17 increases, and the output current of the DC power amplifier 18 increases.
The output current decreases, the attractive force of the upper magnetic pole 1 increases, the attractive force of the lower magnetic pole 2 decreases, and the detector moving piece 6 rises. Conversely, detector movement piece 6
If it is above the target position, the attractive force of the upper magnetic pole 1 becomes weaker, the attractive force of the lower magnetic pole 2 becomes stronger, and the detector moving piece 6 descends. In the normal driving state, downward gravity always acts on the detector moving piece 6, so the attractive force of the lower magnetic pole 2 is weak by the gravity and balanced with the attractive force of the upper magnetic pole 1. During measurement, the detector moving piece 6 is normally floated and moved near the center position of the measurement range of the displacement measuring device 9, but during non-measurement, only the weight acts on the detector moving piece 6, so it is placed at the bottom of the sample container. It is below the target position.
Therefore, at the moment when the power source is connected at the start of measurement, a magnetic force acts to pull the detector moving piece 6 upward. When the detector moving piece 6 rises close to the target position, it starts a steady floating and moving state. The viscoelastic value of the fluid to be measured is calculated from the relationship between the magnetic force and the displacement of the detector. Since it is difficult to directly measure the magnetic force, the magnetic force is estimated from the current obtained from the voltage between the voltage measurement terminals 10 and 11 of the coil 3 and the current obtained from the voltage between the voltage measurement terminals 13 and 12 of the coil 4. The displacement of the detector moving piece 6 is measured by a displacement measuring device 9. Calibration of the proportional formula for calculating magnetic force from current is based on the gravitational acceleration that acts on the detector moving piece 6 when the detector moving piece 6 is suspended statically at the center position between the magnetic poles 1 and 2 in the fluid 5 to be measured. Do it. To calculate the viscoelasticity, when the detector moving piece 6 is spherical and vibrates sinusoidally in the vertical direction, Stokes' law is approximately applied, and the storage modulus G′,
Find the dynamic loss (loss modulus) G″.
G′＝F0cosδ／6πrX0
G″＝F0sinδ／6πrX0
ただし、X0は検知子運動片６の振幅（cm）、F0
は磁力の振幅（dyn）、ｒは球の半径（cm）δは
磁力に対する球の変位の位相差（rad）である。
なお弾性率σはσ＝G′、粘性率ηはη＝G″／ω
である。ここにωは振動の角速度（rad／sec）で
ある。以上の説明から明らかなように、本発明に
係る粘度計においては測定のための検知子である
運動片がサーボ機構により制御された吸引磁力で
浮揚、運動させられるという新規な方法を用いて
いるため検知子の機械的支持機構を必要としな
い。したがつて装置の機械的構造が単純化され微
小な検知子が使用でき、さらに機械的支持機構に
起因する誤差が少ない。なお以上の実施例の説明
のうち検知子運動片６の形状については、球の他
に矩形平板や円板、円柱でも可能であり測定値計
算のモデルとして解析し易いものを選択すればよ
い。変位測定装置９については非接触的変位測定
装置９については非接触的変位測定方式であれば
よく、透光性試料では光学的変位測定装置の代わ
りに従来から用いられているフオトセル、フオト
ダイオードも使用可能であり、不透光性試料では
細小Ｘ線ビームを用いるＸ線変位測定装置または
ドツプラー型超音波変位測定装置を使用すればよ
いことは勿論である。また、本発明に係る粘度計
は検知子運動片の変位波形を任意に設定できるた
め動的粘弾性計あるいはレオメーターとしても使
用可能である。 G′＝F 0 cosδ／6πrX 0 G″＝F 0 sinδ／6πrX 0However , X 0 is the amplitude (cm) of the detector moving piece 6, F 0
is the amplitude of the magnetic force (dyn), r is the radius of the sphere (cm), and δ is the phase difference (rad) of the displacement of the sphere with respect to the magnetic force.
The elastic modulus σ is σ=G′, and the viscosity modulus η is η=G″/ω
It is. Here, ω is the angular velocity of vibration (rad/sec). As is clear from the above explanation, the viscometer according to the present invention uses a novel method in which a moving piece, which is a detector for measurement, is levitated and moved by an attractive magnetic force controlled by a servo mechanism. Therefore, no mechanical support mechanism for the detector is required. Therefore, the mechanical structure of the device is simplified, a small detector can be used, and errors caused by the mechanical support mechanism are reduced. In the above embodiments, the shape of the detector moving piece 6 may be a rectangular plate, a disk, or a cylinder in addition to a sphere, and any shape that can be easily analyzed as a model for calculating measured values may be selected. As for the displacement measuring device 9, any non-contact displacement measuring method is sufficient for the non-contact displacement measuring device 9, and for translucent samples, photocells and photodiodes, which are conventionally used instead of optical displacement measuring devices, can also be used. Of course, for non-transparent samples, an X-ray displacement measurement device using a narrow X-ray beam or a Doppler type ultrasonic displacement measurement device may be used. Further, the viscometer according to the present invention can be used as a dynamic viscoelasticity meter or a rheometer since the displacement waveform of the detector moving piece can be arbitrarily set.
第１図は本発明に係る一実施例の装置主要部の
機構説明図であり、第２図はその装置の電気回路
の主要構成図である。
１，２は磁極、３，４はコイル、５は被測定流
体、６は検知子運動片、７は試料容器、８は光
源、９は変位測定装置、１０，１１，１２，１３
は電圧測定端子、１４は波形発生器、１５は演算
増幅器、１６は補償回路、１７，１８は直流電力
増幅器。
FIG. 1 is a mechanical explanatory view of the main parts of an apparatus according to an embodiment of the present invention, and FIG. 2 is a main configuration diagram of the electric circuit of the apparatus. 1 and 2 are magnetic poles, 3 and 4 are coils, 5 is a fluid to be measured, 6 is a detector moving piece, 7 is a sample container, 8 is a light source, 9 is a displacement measuring device, 10, 11, 12, 13
14 is a voltage measurement terminal, 14 is a waveform generator, 15 is an operational amplifier, 16 is a compensation circuit, and 17 and 18 are DC power amplifiers.
Claims (1)
片と、検知子の位置を検出する変位測定装置と、
検知子の目標位置を示す信号を設定する波形発生
器と、吸引磁力を発生し検知子を非接触的に浮揚
運動させる少なくとも１個の電磁石と、検知子の
位置が設定信号に追随するようにその電磁石の磁
力を制御する電子的サーボ機構からなる、流体の
粘度を測定する粘度計。 ２ 検知子の位置を測定する変位測定装置が、光
学的変位測定装置、Ｘ線変位測定装置または超音
波変位測定装置である前記第１項記載の粘度計。[Claims] 1. A magnetic piece as a detector that contacts a fluid to be measured, a displacement measuring device that detects the position of the detector,
a waveform generator that sets a signal indicating the target position of the detector; at least one electromagnet that generates an attractive magnetic force to levitate the detector in a non-contact manner; and a waveform generator that causes the detector to follow the set signal. A viscometer that measures the viscosity of a fluid and consists of an electronic servomechanism that controls the magnetic force of the electromagnet. 2. The viscometer according to item 1, wherein the displacement measuring device for measuring the position of the detector is an optical displacement measuring device, an X-ray displacement measuring device, or an ultrasonic displacement measuring device.
Priority Applications (6)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9670083A JPS59221639A (en) | 1983-05-31 | 1983-05-31 | Viscometer |
| PCT/JP1984/000241 WO1984004812A1 (en) | 1983-05-31 | 1984-05-14 | Rheometer |
| US06/700,708 US4602501A (en) | 1983-05-31 | 1984-05-14 | Rheometer |
| DE8484902051T DE3473351D1 (en) | 1983-05-31 | 1984-05-14 | Rheometer |
| AT84902051T ATE36412T1 (en) | 1983-05-31 | 1984-05-14 | RHEOMETER. |
| EP84902051A EP0144437B1 (en) | 1983-05-31 | 1984-05-14 | Rheometer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9670083A JPS59221639A (en) | 1983-05-31 | 1983-05-31 | Viscometer |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS59221639A JPS59221639A (en) | 1984-12-13 |
| JPH0465333B2 true JPH0465333B2 (en) | 1992-10-19 |
Family
ID=14172035
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP9670083A Granted JPS59221639A (en) | 1983-05-31 | 1983-05-31 | Viscometer |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS59221639A (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0566188A (en) * | 1991-09-06 | 1993-03-19 | Ntc Kogyo Kk | Measuring method for viscoelasticity |
| JP3923300B2 (en) * | 2001-11-27 | 2007-05-30 | エスアイアイ・ナノテクノロジー株式会社 | Scanning probe microscope |
| JP5093599B2 (en) | 2008-04-25 | 2012-12-12 | 国立大学法人 東京大学 | Viscosity / elasticity measuring apparatus and method |
| JP5263780B2 (en) * | 2009-02-13 | 2013-08-14 | セイコーインスツル株式会社 | Viscosity measuring device |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2908469A1 (en) * | 1979-03-05 | 1980-09-11 | Fresenius Chem Pharm Ind | METHOD AND DEVICE FOR DETERMINING THE VISCO-ELASTIC PROPERTIES OF FLUIDS |
-
1983
- 1983-05-31 JP JP9670083A patent/JPS59221639A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS59221639A (en) | 1984-12-13 |
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