JPS63133042A - Dynamic visco-elasticity measuring apparatus - Google Patents
Dynamic visco-elasticity measuring apparatusInfo
- Publication number
- JPS63133042A JPS63133042A JP27874186A JP27874186A JPS63133042A JP S63133042 A JPS63133042 A JP S63133042A JP 27874186 A JP27874186 A JP 27874186A JP 27874186 A JP27874186 A JP 27874186A JP S63133042 A JPS63133042 A JP S63133042A
- Authority
- JP
- Japan
- Prior art keywords
- displacement
- sample
- signal
- converter
- distortion
- 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.)
- Pending
Links
- 238000006073 displacement reaction Methods 0.000 claims abstract description 48
- 238000005259 measurement Methods 0.000 claims abstract description 12
- 230000005284 excitation Effects 0.000 claims description 4
- 238000001514 detection method Methods 0.000 claims description 2
- 238000004458 analytical method Methods 0.000 abstract description 4
- 238000012545 processing Methods 0.000 abstract description 4
- 239000000758 substrate Substances 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 5
- 238000006243 chemical reaction Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 238000005070 sampling Methods 0.000 description 2
- 240000007594 Oryza sativa Species 0.000 description 1
- 235000007164 Oryza sativa Nutrition 0.000 description 1
- 230000003321 amplification Effects 0.000 description 1
- 235000013339 cereals Nutrition 0.000 description 1
- 235000013351 cheese Nutrition 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000000284 extract Substances 0.000 description 1
- 235000013305 food Nutrition 0.000 description 1
- 150000004676 glycans Chemical class 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
- 229920001282 polysaccharide Polymers 0.000 description 1
- 239000005017 polysaccharide Substances 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 235000009566 rice Nutrition 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
Landscapes
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は動的粘弾性測定装置に関し、詳しくはセンサー
として２つの歪変換器を用い、２つのセンサーからの信
号を演算し、差を求めて試料に加わる変位を正確にとら
え、かつ一方のセンサーからその時の力を求め、これら
時系列データから試料の粘弾性定数を正確かつ迅速に求
めることができる装置に関する。この装置は、特に微小
ゲル等の試料の動的粘弾性の測定に適している。[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a dynamic viscoelasticity measurement device, and more specifically, it uses two strain transducers as sensors, calculates the signals from the two sensors, and calculates the difference. The present invention relates to a device that can accurately capture the displacement applied to a sample by using one sensor, determine the force at that time from one sensor, and accurately and quickly determine the viscoelastic constant of the sample from these time-series data. This device is particularly suitable for measuring dynamic viscoelasticity of samples such as microgels.
試料の粘弾性定数の測定は、従来第１図に示したように
して行われている。まず、装置の加振器１が発振器（図
示せず）により所定周波数で駆動され、このときの加振
器の振動軸の変位を片持ち梁方式の歪変換器２により変
位信号ａとして検出する。一方、試料３の下端につなが
れた振動軸から試料に正弦波が加えられ、該試料内を伝
わった振動は試料上端の歪変換器４により力（Ｆｏｒｃ
ｅ）信号すとして検出される。次いで、２つの信号（変
位信号と力信号）は歪増幅器（図示せず）により増幅さ
れ、それら正弦波の位相差と振幅比より粘弾性定数が求
められる。これは、実際にはそれぞれの正弦波を記録計
のＸ軸とＹ軸に入力し、リサジュー図形を書かせて解析
することにより行なわれる。Measurement of the viscoelastic constant of a sample has conventionally been carried out as shown in FIG. First, the vibrator 1 of the device is driven at a predetermined frequency by an oscillator (not shown), and the displacement of the vibration axis of the vibrator at this time is detected as a displacement signal a by the cantilever type strain transducer 2. . On the other hand, a sine wave is applied to the sample from a vibration shaft connected to the lower end of the sample 3, and the vibration transmitted within the sample is converted into a force (Force) by the strain transducer 4 at the upper end of the sample.
e) Detected as a signal. Next, the two signals (displacement signal and force signal) are amplified by a strain amplifier (not shown), and a viscoelastic constant is determined from the phase difference and amplitude ratio of these sine waves. This is actually done by inputting each sine wave to the X and Y axes of the recorder, drawing a Lissajous figure, and analyzing it.
しかし、従来の装置では、特に微小試料を対象とする場
合、試料の高さが低いため、加振の変位量は線形性に保
つためにさらに小さくしなければならない。ところが、
片持ち梁方式の歪変換器では、このように小さくした信
号を検出するためにゲイン（増幅率）を上げると、Ｓ−
Ｎ比（信号雑音比）が小さくなり、精度が低下する。ま
た、変位量が小さいと、それに対して力を検出する歪変
換器４の変位が無視できなくなる。それ故、特に微小試
料の正確な粘弾性測定は不可能である。However, in the conventional apparatus, especially when a micro sample is targeted, the height of the sample is low, so the amount of excitation displacement must be further reduced in order to maintain linearity. However,
In a cantilever type strain converter, when the gain (amplification factor) is increased to detect such a reduced signal, the S-
The N ratio (signal-to-noise ratio) becomes small, and the accuracy decreases. Furthermore, if the amount of displacement is small, the displacement of the strain transducer 4 that detects the force cannot be ignored. Therefore, accurate viscoelastic measurements of particularly small samples are not possible.
本発明者らは、このような問題点を解決すべく検討を重
ね、動的粘弾性測定装置において、試料に加振する歪変
換器を特定し、かつ検知された変位の誤差を補償する演
算装置を設けることにより、試料の正確な粘弾性測定を
行なえることを見出し、本発明を完成したのである。In order to solve these problems, the inventors of the present invention have conducted repeated studies to identify the strain transducer that vibrates the sample in a dynamic viscoelasticity measuring device, and to develop an operation that compensates for errors in the detected displacement. They discovered that by providing a device, it was possible to accurately measure the viscoelasticity of a sample, and completed the present invention.
すなわち本発明は、動的粘弾性測定装置において、試料
に変位を与える加振側の変位検知手段として軸方向変位
型歪変換器を用い、かつ試料を通過した振動を力として
検知する軸方向変位型歪変換器の変位による誤差を補償
する演算装置を備えたことを特徴とする動的粘弾性測定
装置を提供するものである。That is, the present invention uses an axial displacement type strain transducer as a displacement detection means on the excitation side that applies displacement to a sample in a dynamic viscoelasticity measurement device, and uses an axial displacement type strain transducer to detect vibrations passing through the sample as force. The present invention provides a dynamic viscoelasticity measurement device characterized by being equipped with an arithmetic device that compensates for errors caused by displacement of a mold strain converter.
第２図は、本発明の装置の実施例を示す説明図である。FIG. 2 is an explanatory diagram showing an embodiment of the apparatus of the present invention.
この図面により本発明を説明する。The present invention will be explained with reference to this drawing.
まず、試料３に対して加振器１より正弦波を加えるが、
試料が微小体であるときは非常に小さな変位を与えるだ
けで十分である。この変位は軸方向変位型の歪変換器（
非接触、直線偏位形ストレインゲージ）５により変位信
号Ｃとして検出される。この歪変換器は変位量が少ない
ため、小さな変位で大きな出力を得ることができる。First, a sine wave is applied to sample 3 from vibrator 1,
When the sample is minute, it is sufficient to apply a very small displacement. This displacement is measured by an axial displacement type strain transducer (
It is detected as a displacement signal C by a non-contact, linear displacement strain gauge) 5. Since this strain converter has a small amount of displacement, it is possible to obtain a large output with a small displacement.
一方、試料内を通過した振動は同じ型の歪変換器４によ
り力信号すとして検出する。この場合、歪変換器４の変
位を無視すると測定値が不正確となる。すなわち、試料
に歪変換器５で検出された大きさで変位を与えていなが
ら、歪変換器４の変位により実際に加わった変位はより
小さい値となり、正確な粘弾性定数を測定することがで
きなくなる。On the other hand, vibrations passing through the sample are detected as force signals by a strain transducer 4 of the same type. In this case, if the displacement of the strain transducer 4 is ignored, the measured value will be inaccurate. In other words, even though a displacement is applied to the sample with the magnitude detected by the strain transducer 5, the actual displacement due to the displacement of the strain transducer 4 becomes a smaller value, making it possible to accurately measure the viscoelastic constant. It disappears.
そこで、本発明では演算装置６を設置し、歪変換器５の
変位量から歪変換器４の変位量を差し刊１き、実際の変
位量を求める。次いで、このようにして得た変位差信号
ｄと歪変換器４の力信号すを信号Ｃと振幅や位相差が異
なっても周波数が同じであるから、正弦波になり従来と
同じ解析が可能である。しかし、歪変換器の信号を変位
あるいは力に直すには、それぞれに較正係数があるので
単に極性を変えて並列につなぐことはできない。そ゛こ
で、本発明の装置では一連のアルゴリズムをデジタル信
号処理により行なうことにより解析するのである。Therefore, in the present invention, an arithmetic device 6 is installed, and the amount of displacement of the strain converter 4 is calculated from the amount of displacement of the strain converter 5 to obtain the actual amount of displacement. Next, the displacement difference signal d obtained in this way and the force signal S of the strain converter 4 are the same as the signal C even if the amplitude and phase difference are different, so they become sine waves and can be analyzed in the same way as before. It is. However, in order to convert the signal from the strain transducer into displacement or force, it is not possible to simply change the polarity and connect them in parallel because each has a calibration coefficient. Therefore, the apparatus of the present invention performs analysis by performing a series of algorithms through digital signal processing.
第３図は微小試料の粘弾性測定システムを示す。FIG. 3 shows a system for measuring viscoelasticity of micro samples.
図中ｌｌは発振器、１２は増幅器、１３は歪増幅器、１
４はＡＤ変換器、１５は記憶装置、１６はＣＲＴディス
プレイ、１７はプリンタ、１８は記憶媒体、１９はキー
ボードである。また、試料の性状を考慮して第４．５図
に示した如きセルを使用することにより固体のみならず
ゾル、液体、シート、フィルム等の様々な試料について
測定が可能となる。図中、２０はセル、２１はブレード
である。In the figure, 11 is an oscillator, 12 is an amplifier, 13 is a distortion amplifier, 1
4 is an AD converter, 15 is a storage device, 16 is a CRT display, 17 is a printer, 18 is a storage medium, and 19 is a keyboard. Furthermore, by using a cell as shown in FIG. 4.5 in consideration of the properties of the sample, it becomes possible to measure not only solids but also various samples such as sol, liquid, sheet, and film. In the figure, 20 is a cell and 21 is a blade.
本発明の対象となる試料には制限はなく、各種試料につ
いて粘弾性定数を測定できるが、特に米飯粒、Ｉチーズ
片等の微小試料についても正確に測定することが可能で
ある。そのほか生体、農産物等から微量抽出物、多糖類
、さらには生体や農産物等の組織切片等についてもセル
を使用することにより測定することができる。なお、上
記の説明では試料への変位は加振器により行なったが、
モーターと接続した偏心カム等も使用できる。また、試
料と２つの歪変換器は同一軸上にあればよ（、第２図、
第３図の態様に制限されるものではない。There is no limit to the samples to which the present invention can be applied, and the viscoelastic constants can be measured for various samples, but it is also possible to accurately measure particularly minute samples such as cooked rice grains and pieces of I-cheese. In addition, trace amounts of extracts from living organisms, agricultural products, etc., polysaccharides, tissue sections of living organisms, agricultural products, etc. can also be measured by using the cell. In addition, in the above explanation, the displacement to the sample was performed using a vibrator, but
Eccentric cams connected to a motor can also be used. Also, the sample and the two strain transducers should be on the same axis (Fig. 2,
The embodiment is not limited to the embodiment shown in FIG.
〔作用２発明の効果〕
次に、本発明の装置の作用について第３図に示したシス
テムに基いて説明する。[Operation 2: Effects of the Invention] Next, the operation of the apparatus of the present invention will be explained based on the system shown in FIG.
キーボード１９より任意の周波数を入力することにより
、ＣＰＵ （中央演算装置）６を通じて発振器１１をそ
の周波数で発振させる。この発振器の信号は増幅器１２
を通して加振器１を駆動する。By inputting an arbitrary frequency from the keyboard 19, the oscillator 11 is caused to oscillate at that frequency through the CPU (central processing unit) 6. The signal of this oscillator is transmitted to the amplifier 12
The vibrator 1 is driven through.
加振器の振動軸は試料下端につながれており、試料に正
弦波が加えられる。この加振側の正弦波振動は振動軸の
下方に付けられた歪変換器（ストレインゲージ）５にて
信号Ｃとして取り出し歪４幡器（ストレイン丁ンブ）１
３を通して増幅され、ＡＤ変換器（アナログ−デジタル
変換器）１４のチャンネル１に人力される。一方、試料
内を伝わった振動は、試料上端の歪変換器４にて信号す
として取り出し歪増幅器１３を通して増幅され、ＡＤ変
換器１４のチャンネル２に入力される。The vibration axis of the vibrator is connected to the lower end of the sample, and a sine wave is applied to the sample. This sine wave vibration on the excitation side is extracted as a signal C by a strain transducer (strain gauge) 5 attached below the vibration axis.
3 and input to channel 1 of an AD converter (analog-to-digital converter) 14. On the other hand, the vibrations transmitted within the sample are taken out as a signal by the strain converter 4 at the upper end of the sample, amplified through the strain amplifier 13, and input into channel 2 of the AD converter 14.
ＡＤ変換器は人力された信号Ｃと信号すをデジタル信号
に変換し、記憶装置１５に送り出す。ここにデータを一
時記憶することにより高い周波数の測定も可能になる。The AD converter converts the manually input signals C and S into digital signals and sends them to the storage device 15. By temporarily storing data here, it is also possible to measure high frequencies.
記憶装置には、後述するように■メモリにストレージス
コープを使う場合と■、工六。変換よ−、を使う場合う
、考え、わ、。For storage devices, ■When using storage scope for memory and ■, Kunroku, as described later. When you use conversion yo-, you think, wa,.
ＣＰＵは、このデータを取り出し、以下の演算を行う。The CPU takes out this data and performs the following calculations.
信号Ｃと信号すに、それぞれの変換器の変位較正係数を
乗じて変位量に直し、その差の信号ｄを求める。この信
号ｄが正味の変位信号である。Signals C and S are multiplied by the displacement calibration coefficients of the respective transducers to convert them into displacement amounts, and the difference signal d is obtained. This signal d is the net displacement signal.
また一方で、信号すに力較正係数を乗じ信号す。On the other hand, the signal is multiplied by the force calibration coefficient.
を求める。この２つの正弦波をＣＲＴディスプレイ （
モニタ）１６に再現する。さらに、この２つの正弦波に
ノイズ除去処理を施し、そこから、それぞれの最大値、
最小値（［動比）及び位相差を検出する。それらの解析
結果を基に粘弾性パラメータ（動的弾性率、動的損失、
ｊａｎδ等）が計算される。これらの内容はＣＲＴデ
ィスプレイへの表示、プリンタへの印字、記憶媒体（フ
ロッピーディスケット等）への保存が可能である。seek. These two sine waves are displayed on a CRT display (
Monitor) Reproduced on 16. Furthermore, we perform noise removal processing on these two sine waves, and from there, we calculate the maximum value of each,
Detect the minimum value (dynamic ratio) and phase difference. Based on those analysis results, viscoelastic parameters (dynamic modulus, dynamic loss,
janδ, etc.) are calculated. These contents can be displayed on a CRT display, printed on a printer, or saved on a storage medium (such as a floppy diskette).
■メモリにストレージスコープを使う場合歪増幅器から
の人力信号をストレージオシロスコープに入れ、そこの
メモリに一時記憶させる。■When using a storage scope for memory Input the human input signal from the distortion amplifier into the storage oscilloscope and temporarily store it in its memory.
ＣＰＵとストレージオシロスコープはＣＰ−ＩＢゼイン
ーフェースによりつながれており、入力信号のサンプリ
ング間隔等はＣＰＵにより制御される。一般にストレー
ジオシロスコープは高速サンプリングが可能で周波数の
高い信号も高分解能で記憶できる。このデータをＣＰ−
Ｉ ＢインターフェースバスによりＣＰＵ管理下の主記
憶装置（メインメモリ）に転送し、解析が行われる。The CPU and the storage oscilloscope are connected by a CP-IB interface, and the sampling interval of the input signal and the like are controlled by the CPU. In general, storage oscilloscopes are capable of high-speed sampling and can store high-frequency signals with high resolution. Transfer this data to CP-
The data is transferred to the main memory under the control of the CPU via the IB interface bus and analyzed.
■メモリにＡＤ変換ボードを使う場合
歪増幅器からの入力信号を直接コンピュータのＡＤ変換
ボードに入力し、ＣＰＵの主記憶装置に転送し、解析が
行われる。ＣＰ−ＩＢゼインーフェースのようなハンド
シェイクによるやり取りはないので、測定時間は短い。■When using an AD conversion board for memory The input signal from the distortion amplifier is directly input to the AD conversion board of the computer, transferred to the main memory of the CPU, and analyzed. Since there is no handshake exchange like in the CP-IB interface, the measurement time is short.
次に、同一試料（チーズ片、１０ｘｌＯｘｌＯ龍）につ
いて第１図に示した従来装置による方法と第２図に示し
た本発明装置による方法で測定した結果を第１表および
第６〜７図に示す。Next, the results of measuring the same sample (cheese piece, 10xlOxlO dragon) using the method using the conventional apparatus shown in Fig. 1 and the method using the apparatus of the present invention shown in Fig. 2 are shown in Table 1 and Figs. show.
従来法では加振器より加える歪は見かけ上、２．０８２
Ｘ１０−３ となっているが、この値には力を検出す
る歪変換器の変位も含まれており、試料の粘弾性定数は
実際の値よりも小さい値として求められてしまう。これ
に対して、本発明装置を用いた方法では、この点が改善
され正味の歪による正しい粘弾性定数が求められる。In the conventional method, the apparent strain applied by the vibrator is 2.082
However, this value also includes the displacement of the strain transducer that detects the force, and the viscoelastic constant of the sample is determined to be a smaller value than the actual value. On the other hand, the method using the device of the present invention improves this point and allows correct viscoelastic constants to be determined based on net strain.
第１図は従来の装置による粘弾性測定の態様を示す説明
図、第２図は本発明の装置による粘弾性測定の態様を示
す説明図、第３図は同じく本発明の装置のシステム図の
１例を示す。第４図および第５図は本発明に用いる試料
セルの態様の見取図、第６図は従来の装置による粘弾性
測定結果を示す出力信号図、第７図は本発明の装置によ
る粘弾性測定結果を示す出力信号図である。
１・・・加振器、２・・・歪変換器、３・・・試料。
４・・・歪変換器、５・・・歪変換器、６・・・演算装
置特許出願人 農林水産省食品総合研究所長第４図
第５図
第６図FIG. 1 is an explanatory diagram showing a mode of viscoelasticity measurement using a conventional device, FIG. 2 is an explanatory diagram showing a mode of viscoelasticity measurement using the device of the present invention, and FIG. 3 is a system diagram of the device of the present invention. An example is shown. 4 and 5 are sketches of the sample cell used in the present invention, FIG. 6 is an output signal diagram showing the results of viscoelasticity measurement by the conventional device, and FIG. 7 is the results of viscoelasticity measurement by the device of the present invention. FIG. 1... Vibrator, 2... Strain converter, 3... Sample. 4...Strain converter, 5...Strain converter, 6...Arithmetic device Patent applicant Director, Food Research Institute, Ministry of Agriculture, Forestry and Fisheries Figure 4 Figure 5 Figure 6
Claims (1)
側の変位検知手段として軸方向変位型歪変換器を用い、
かつ試料を通過した振動を力として検知する軸方向変位
型歪変換器の変位による誤差を補償する演算装置を備え
たことを特徴とする動的粘弾性測定装置。In a dynamic viscoelasticity measurement device, an axial displacement strain transducer is used as a displacement detection means on the excitation side that applies displacement to the sample.
A dynamic viscoelasticity measuring device characterized by comprising: a calculation device that compensates for errors caused by displacement of an axial displacement type strain transducer that detects vibrations passing through the sample as force.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP27874186A JPS63133042A (en) | 1986-11-25 | 1986-11-25 | Dynamic visco-elasticity measuring apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP27874186A JPS63133042A (en) | 1986-11-25 | 1986-11-25 | Dynamic visco-elasticity measuring apparatus |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS63133042A true JPS63133042A (en) | 1988-06-04 |
Family
ID=17601557
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP27874186A Pending JPS63133042A (en) | 1986-11-25 | 1986-11-25 | Dynamic visco-elasticity measuring apparatus |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS63133042A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2021135253A (en) * | 2020-02-28 | 2021-09-13 | 株式会社サタケ | Glutinousness evaluation method, display object and map |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS488308U (en) * | 1971-06-15 | 1973-01-30 | ||
| JPS612180A (en) * | 1984-06-14 | 1986-01-08 | Tokyo Electric Co Ltd | Toner recovering device of electrostatic photographing device |
-
1986
- 1986-11-25 JP JP27874186A patent/JPS63133042A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS488308U (en) * | 1971-06-15 | 1973-01-30 | ||
| JPS612180A (en) * | 1984-06-14 | 1986-01-08 | Tokyo Electric Co Ltd | Toner recovering device of electrostatic photographing device |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2021135253A (en) * | 2020-02-28 | 2021-09-13 | 株式会社サタケ | Glutinousness evaluation method, display object and map |
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