JPS58160843A - Centrifugal measuring method of particle size distribution - Google Patents
Centrifugal measuring method of particle size distributionInfo
- Publication number
- JPS58160843A JPS58160843A JP4486782A JP4486782A JPS58160843A JP S58160843 A JPS58160843 A JP S58160843A JP 4486782 A JP4486782 A JP 4486782A JP 4486782 A JP4486782 A JP 4486782A JP S58160843 A JPS58160843 A JP S58160843A
- Authority
- JP
- Japan
- Prior art keywords
- particle size
- time
- function
- size distribution
- turns
- 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
- 239000002245 particle Substances 0.000 title claims abstract description 54
- 238000009826 distribution Methods 0.000 title claims abstract description 23
- 238000000034 method Methods 0.000 title claims description 21
- 238000001514 detection method Methods 0.000 claims abstract description 11
- 230000005484 gravity Effects 0.000 claims description 9
- 238000012545 processing Methods 0.000 claims description 5
- 238000005259 measurement Methods 0.000 abstract description 9
- 238000004062 sedimentation Methods 0.000 description 12
- 230000002123 temporal effect Effects 0.000 description 4
- 230000005540 biological transmission Effects 0.000 description 3
- 238000012937 correction Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000000691 measurement method Methods 0.000 description 2
- 238000011017 operating method Methods 0.000 description 2
- 239000008280 blood Substances 0.000 description 1
- 210000004369 blood Anatomy 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000002920 convulsive effect Effects 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
- G01N15/04—Investigating sedimentation of particle suspensions
- G01N15/042—Investigating sedimentation of particle suspensions by centrifuging and investigating centrifugates
Landscapes
- Chemical & Material Sciences (AREA)
- Dispersion Chemistry (AREA)
- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Sampling And Sample Adjustment (AREA)
- Investigating Or Analysing Materials By Optical Means (AREA)
Abstract
Description
【発明の詳細な説明】 本発明は遠心式粒度分布測定方法に関する、。[Detailed description of the invention] The present invention relates to a centrifugal particle size distribution measuring method.
一般に密度ｐｏ （１／ｄ ） 、粘性係数η０をもつ
溶媒中に存在する直径Ｄ （Ｃ１ｌ） 、密度Ｐ（＃／
ｃｊ）の粒子は重力の影響によって沈降するが、一定距
離沈降するのに要する時間はストークスの沈降式Ｋｍう
ことが知られている。ここにストークスの沈降式は、自
然重力沈降のときは、
で表わされ、また遠心重力沈降のときはで表わされる０
但し、ｔは沈降時間（ｓｅｃ） 、 Ｈは沈降Ｗｅｌｌ
ｌｉ （ｃｍ） 、 Ｉハ自ｇｌ力加４Ｆｌ （ａｖ’
８” ） 、 Ｘｌは１転中心より沈降＃壜での距離（
ｃｍ） 、 Ｘ２ は回転中心より＃ｌ定向までの距離
（１）、−は回転角速度（ｒａｄ／減）である。In general, the density po (1/d), the diameter D (C1l) present in a solvent with a viscosity coefficient η0, and the density P (#/
Particles cj) settle under the influence of gravity, and it is known that the time required for settling a certain distance is equal to the Stokes sedimentation equation Km. Here, Stokes' sedimentation equation is expressed as 0 in the case of natural gravity sedimentation, and 0 in the case of centrifugal gravity sedimentation.
However, t is sedimentation time (sec), H is sedimentation well
li (cm), Igl force applied 4Fl (av'
8”), Xl is the distance from the center of one turn in the #bottle
cm), X2 is the distance (1) from the rotation center to the #l orientation, and - is the rotational angular velocity (rad/decrease).
試料の粒度分布調定方法は、このような粒子径りと沈降
時間ｔの相間々係を利用したもので、測定ＫＪ！Ｉして
は、先ず試料をセル内で均一に＠濁した後自然重力或い
は遠心重力が作用する状態におき、沈Ｐｌ＃面から一定
距離はなれた位置の粒子濃度の時間的変化を光透過法等
にて観処し、それによって得られた粒子濃度の時間的変
化特性曲線と−Ｆ１第（１）式若しくは第（２）式とを
演算処理することによって行なう。つまり試料を均−Ｋ
ｌ！ｉ’ｍＬ、た時点からの経過時間がわかれば、その
時間内にいくらの径以上の粒子が測定位置を完全に通過
したかが上記第（１）式若しくは第１２１式によって定
性的に求められるから、この（１）式若しくは（２）式
と前記粒子幽度の時間的変化特性曲線とから粒度分布を
求めることができるのである。The method for adjusting the particle size distribution of the sample utilizes the relationship between the particle size and sedimentation time t, and the measurement KJ! First, the sample is uniformly turbid in a cell, then placed under natural gravity or centrifugal gravity, and the temporal change in particle concentration at a position a certain distance from the Pl# surface is measured using the light transmission method. etc., and then performs arithmetic processing on the obtained temporal change characteristic curve of particle concentration and -F1 equation (1) or (2). In other words, the sample is uniformly −K
l! If the elapsed time from the time i'mL is known, the number of particles of which diameter or larger completely passed through the measurement position within that time can be qualitatively determined using equation (1) or equation 121 above. Therefore, the particle size distribution can be determined from equation (1) or equation (2) and the temporal change characteristic curve of particle density.
丸だこの場合、自然重力によって沈降させる方式ではｇ
が一定であるが、遠心重力によって沈降させる方式では
回転数を為く保つことによつ−（ｔ。In the case of a round oval, in the method of settling by natural gravity, g
is constant, but in the method of settling by centrifugal gravity, by keeping the rotation speed constant -(t).
をいくらで４萬めることができ、従って微小な粒子の粒
度分布でも短時間に測定できるという利点がある。この
ため現行の粒度分布測定方法ｔｉ、遠心式のものが多く
採用されている。40,000 at a time, and therefore has the advantage that even the particle size distribution of minute particles can be measured in a short time. For this reason, the current particle size distribution measurement method ti, centrifugal type, is often employed.
しかしながら現行の遠心式粒度分布＃Ｉ定方法は回転数
を一定に保った状態で行なうものであるために次のよう
な欠点がある。However, the current centrifugal particle size distribution #I determination method is carried out while keeping the rotational speed constant, and therefore has the following drawbacks.
即ち、回転ディスクの回転数を比較的低速（例えばｔｏ
ｏｏ ｒｐｍ ＞にすると粒度分布の広い試料を測定す
る場合、遠心式であるにも拘らず非常に長時間を要する
っ一方、これを改善するために回転数を＾く（例えばｓ
ｏｏｏｒｐｍ）すると粒子径の大きい粒子の沈吟速度が
速くて＠短時間が短か過ぎ、そのため大粒子については
大きな誤差を含んだものとなる。That is, the rotation speed of the rotating disk is set to a relatively low speed (for example, to
If you set oo rpm >, it will take a very long time to measure a sample with a wide particle size distribution, even though it is a centrifugal type.
ooorpm), the settling speed of particles with large particle diameters is fast and @the short time is too short, and therefore, large particles contain a large error.
従つ王１粒度分布の広い試料を測定するに際してｌよ、
＃１足目的とする粒子の大きさ−に１転数を段階的に変
えて行なう必要がある。Therefore, when measuring samples with a wide particle size distribution,
#1 It is necessary to change the number of rotations step by step according to the target particle size.
ところがこのように回転数を段階的に変えると、Ｉｌ！
１足の自動化がＩＡ４雌であるし、測定準備操作に時間
がかかるという欠点がある。斐にそれ以上に、ｔＩ４１
も回転と停止とを繰返すことになるので、試料に補正し
雌い繍影響を及はすという欠点がある。However, if you change the rotation speed step by step like this, Il!
One step of automation is IA4 female, and there is a drawback that it takes time to prepare for measurement. More than that, tI41
Since the method also repeats rotation and stopping, there is a drawback that corrections and embossment effects are exerted on the sample.
つまり、１転と停止とを繰返すと試料は所定の回転数に
達するまでの間、及びその回転数から停止゛するまでの
間も沈降を行なっているので、それの補正が非常に蝋し
いのである。In other words, when one revolution and a stop are repeated, the sample continues to settle until it reaches a predetermined number of revolutions, and also from that number of revolutions until it stops, so the correction for this is very slow. be.
本発明はこのような欠点を悉く解消し、広い粒度分布を
有する試料であっても短時間に測定を行なうことのでき
る巧みな一方法を提供するものである。The present invention eliminates all of these drawbacks and provides an ingenious method that allows measurement even for samples with a wide particle size distribution in a short time.
而して本発明に係る遠心式粒度分布測定方法は、試料セ
ルを設置した回転ディスクの回転を時間的に連続して増
大させて試料セル内の試料粒子ｋｂｕ速度的に増大する
遠心重力によって沈降させるようにし、もって各瞬時に
おける回転ディスクの１転数及び回転開始時からその瞬
時までに賛した時間並びに沈′ＰＩ＃面から一定距離は
なれた粒子濃度を検出する検出器の各瞬時における検出
データの３者を演算処理して試料粒子の粒度分布を求め
るようにしたことを要旨とする。ここに回転ディスクの
回転数を時間的に連続して増大させるｗ４ａ！としては
一次関数的或いは二次関数的に増大させる等各種の態様
で行なうことができる。このように回転数を経時的に増
大させると上記第（２）式中のωが時間の関数となるの
で、目減の分母にあるｗ２Ｌは各瞬時ΔＬにおけるω′
の値を全ての時間にばって加算した値、換イすればω２
の時間積分値（ｓｏω’ｄｔ）であられされる。この丸
め、＃ｉ定に際しては各瞬時における−の値と、回転開
始時から各瞬時までの時間とを測抄、それを演算処理の
段階で加痒或いは４１１１算処理する必要がある。そし
て、この処理の結果優られた値を検出器からの？−夕と
共に第（２）式に基づいて演算処理すれば粒度分布を求
めることができる。上鮎各瞬時のωの値と回転開始から
各一時までの時間との加算、積算処理及びその処理によ
って得られた値と検出器からのデータの演痒処−は論理
回路によって行なうことができるが、ｉ！！ｌ路が複雑
になるし、組立に手数を要するので、４常コンピユータ
によって行なうのが望ましい、尚、検出データの検出方
法としては一般に光透過法を用いるのが望ましい、１
ＣＪＦＶＣ本発明の一実施例を図面に基づいて説明する
。＠Ｌ図は検出データを光透−法によって得るように１
７た遠心式粒度分布／ＩＮ＋定方法全方法するだめの構
成を示し、（１）は回転ディスク、＋２） 、１２１は
回転ディスクトに設けられた試料セル、（３）は回転デ
ィスク１を回転するモータである。このモータＣよ１回
転ディスク（１）の回転数を経時的に増大させる必要が
ある関係り、回転数制御のできるモータを用いるのが良
い。According to the centrifugal particle size distribution measuring method according to the present invention, the rotation of a rotating disk in which a sample cell is installed is continuously increased over time, and the sample particles in the sample cell are sedimented by centrifugal gravity, which increases in kbu velocity. Thus, the number of rotations of the rotating disk at each instant, the time from the start of rotation to that instant, and the detection data at each instant of the detector that detects the particle concentration at a certain distance from the PI surface. The gist is that the particle size distribution of sample particles is obtained by calculating the three factors. Here, the number of rotations of the rotating disk is increased continuously over time w4a! This can be done in various ways, such as increasing linearly or quadratically. When the rotational speed is increased over time in this way, ω in the above equation (2) becomes a function of time, so w2L in the denominator of the reduction is ω' at each instant ΔL.
The value obtained by adding the values of
It is calculated by the time integral value (soω'dt). In this rounding and determination of #i, it is necessary to measure the - value at each instant and the time from the start of rotation to each instant, and then add it or perform 4111 calculations at the calculation stage. And does this process result in superior values from the detector? - Particle size distribution can be obtained by performing arithmetic processing based on Equation (2) together with -. A logic circuit can perform the addition of the value of ω at each instant and the time from the start of rotation to each hour, the integration process, and the operation of the value obtained by this process and the data from the detector. But, i! ! Since the L path becomes complicated and the assembly requires time, it is preferable to use a four-way computer. Furthermore, it is generally preferable to use a light transmission method as a method of detecting detection data. 1 CJFVC One implementation of the present invention An example will be explained based on the drawings. @L diagram shows detection data obtained by optical transmission method.
7 Centrifugal Particle Size Distribution/IN+Identification Method The structure of the entire method is shown, (1) is a rotating disk, +2), 121 is a sample cell provided on a rotating disk, and (3) is a rotating disk that rotates the rotating disk 1. It is a motor that Since it is necessary to increase the number of revolutions of the one-rotation disk (1) over time by the motor C, it is preferable to use a motor that can control the number of revolutions.
（４）は光源、（５）は光源用′ｔｊＬ源、（６）は検
出器と１２、（例えばフォトダイオード、 （７１ｔ；
ｊ増幅器である、っ前ｄピ光源（４）と検出器１６）と
は試料ヒル（２）の沈降向（２ｄ）から一定距ｌｉ、ｌ
隔てた地点（２ｂ）を照準、規準するように配設されて
いる。１８）は演痙装置として例えばコンピュータＣ１
このコンピュータ＃Ｊ上述し、ゲ閲県機能の（ｌｆｘに
モータ（３）を駆動する璽圧をコントロールする機能、
モータの回転数を経時的に酌める機能、及び各瞬時にお
けるモータの回転数を測定する機能並びに回転開始時か
ら各瞬時までの時１１ｊ１を測定する機能を有している
。このコンピュータｆ８＋１（接続された入力装置（９
）には、モータ躯動用の電圧を一次関数的あるいは二次
関数的等いかなる態様で上昇させるかのプログジムや、
その回転数から角速度ωを算出するための係数及びスト
ークスの沈降式ＣＭ１２１式）中のηＧ、ρ＋ｐｏ等演
算に必要な情報が記憶され、コンピュータｆ８１にそれ
らの情報を入力している、このコンピュータ（８）にて
演算処理された結果は、出力装＊ＱＯで表示さ７するー
）ｉｌｊ力Ｍ［ｔＱｌ）！： Ｌ、テｉｊＣＲＴ、或い
はべ’４＠Ａ”ログラフ等が適用できる０
尚、回転ディスクｔ１）の回転数の絞入は試料中に誰ま
れる最小粒子径によって適配定めることができるが、一
般には５００ｒｐ（Ｕ程度とすれば良い。(4) is a light source, (5) is a 'tjL source for the light source, (6) is a detector and 12 (for example, a photodiode, (71t);
The front dpi light source (4) and the detector 16), which are j amplifiers, are located at a certain distance li, l from the sedimentation direction (2d) of the sample hill (2).
It is arranged to aim and standardize a distant point (2b). 18) is, for example, a computer C1 as a convulsive device.
As mentioned above, this computer #J has the game control function (the function to control the pressure that drives the motor (3) to lfx,
It has a function of considering the rotation speed of the motor over time, a function of measuring the rotation speed of the motor at each instant, and a function of measuring time 11j1 from the start of rotation to each instant. This computer f8+1 (connected input device (9)
) includes programs on how to increase the voltage for motor rotation in a linear or quadratic manner,
This computer stores the coefficients for calculating the angular velocity ω from the rotational speed and the information necessary to calculate ηG, ρ+po, etc. in the Stokes sedimentation equation CM121), and inputs this information to the computer f81 ( The result of the arithmetic processing in 8) is displayed on the output device *QO7) ilj force M[tQl)! :L, TEijCRT, or Be'4@A'' loggraph, etc. can be applied.The number of revolutions of the rotating disk t1) can be appropriately determined depending on the minimum particle diameter that is dispersed in the sample. In general, it may be approximately 500 rp (U).
この構成にしいて試料粒子−のれ度分４を求めるための
操作手順は、単−回だけ１１転デイスクを一定回転数で
回転させて＃ｌ′ｉＥする従来の方法と全く同じである
０、ただ回転？イスクの回転が経時的に増大するので粒
子の沈降速度が刻ン異なＬそのためこの沈降速度の変化
を演ギ処理の段階で加味するに！°き′ない。しかし、
この演算処理もコンピュータ（８）内でｈなわれるので
、操作手順としては従来と１１ＩＪら異ならない〇
即し、セル内の試料を均一に懸濁して後、回転ディスク
を回転さするだけで↓いｏ’ｆｂ回転ディスク（１）の
回転数Ｎが第２図に破線で示を如く直線的に増大され、
その羨−足回転数（例えば５θ０Ｏｒｐ山）に維持され
るという変化を辿った場合において各瞬時における検出
器（６）にて検出されるデータＤが同図に実線で示す如
く変化したとするっこの検出データＤは透過光量であり
、それは粒子濃度を意味している。この場合、各瞬時に
おける回転数Ｎ１四転開始から各瞬時までの時間ｔＩ、
ｔＩ・・・、その他第（２）式中のη０．ρ、ρＯ、ｘ
、 、 Ｘｔは既知であるから、コンピュータ侶）が、
これら既知−をストークスの沈降式に基づいて演算処理
することによって時間ｔ１秒においてはある一定の径以
り。With this configuration, the operating procedure for determining the sample particle drift degree 4 is exactly the same as the conventional method of #l'iE by rotating the 11-turn disk at a constant rotation speed only once. Just rotate? As the rotation of the disk increases over time, the sedimentation speed of the particles varies from time to time. Therefore, this change in sedimentation speed must be taken into account at the stage of the process. I don't like it. but,
This arithmetic processing is also done in the computer (8), so the operating procedure is no different from that of the conventional 11IJ.In other words, after uniformly suspending the sample in the cell, simply rotate the rotating disk↓ The rotation speed N of the o'fb rotating disk (1) is increased linearly as shown by the broken line in FIG.
Suppose that the data D detected by the detector (6) at each instant changes as shown by the solid line in the figure when following the change in which the rotation speed is maintained at the desired foot rotation speed (for example, 5θ0 Orp peak). This detection data D is the amount of transmitted light, which means the particle concentration. In this case, the time tI from the start of rotation N1 at each instant to each instant,
tI..., and other η0 in formula (2). ρ, ρO, x
, , Since Xt is known, the computer expert)
By calculating these known values based on Stokes' sedimentation equation, the diameter becomes a certain value at time t1 seconds.
例えばｌＯミクロン以上の粒子は測定面を通過してしま
っており時間１．秒においては例えば９ミクロン以上の
粒子ｔよ測定面を通過してしまっていることが針鼻され
る。従って回転開始時よりし１秒までの間における検出
データの減装置り。１（＝ｌ）１゜Ｄ、）からｌθミク
ロン以上の粒子の占める割合がわかシ、ｔＩ秒からｔ□
秒までの時間における検出データＤＩ、＋（＝ Ｄ＋
−Ｄｊｌ ）から９ミクロン以上１０ミクロン未膚の粒
子の占める割合がわかる。このようにして検出データの
減小履を各瞬時において次々と針痒してゆくことにより
粒度分布を求めることができる。For example, particles larger than 10 microns have passed through the measurement surface, and the time 1. It is clear that in seconds, for example, particles t of 9 microns or more have passed through the measurement surface. Therefore, it is possible to reduce the detection data for up to 1 second from the start of rotation. 1 (=l) 1°D, ) to the ratio of particles larger than lθ microns, from tI seconds to t□
Detection data DI, + (= D+
-Djl), the proportion of particles with a diameter of 9 microns or more and a diameter of 10 microns or less can be determined. In this way, the particle size distribution can be determined by sequentially increasing the decrease in detection data at each instant.
本＠明に係る遠心式粒度分布測定方法は以上述べた如く
、回転ディスクの回転数を時間的に連続して増大させて
セル内の試料粒子を加速度的に増大する遠心血力により
て沈降さぜるようにして遂行されるものであるから５次
の如き優れた効果がある、
中 回転数を大粒子の測定に適した低速から小粒子の測
定に適した高速まで増大させるので幅広い粒度分布をも
つ試料の測定が単−回の操作でイ１なうことができる。As described above, the centrifugal particle size distribution measurement method according to the present invention involves increasing the number of rotations of a rotating disk continuously over time to cause sample particles in a cell to settle due to centrifugal blood force that increases at an accelerating rate. Because it is carried out in a continuous manner, it has excellent effects such as 5th order.Middle Since the rotation speed is increased from low speed suitable for measuring large particles to high speed suitable for measuring small particles, a wide range of particle size distribution can be achieved. It is possible to measure samples with 100% by single operation in a single operation.
従って、これによって測定の自動化４０１能となる（−
１測定時間の大幅なｗｋ１縮が可能となる。Therefore, this provides the ability to automate measurements (-
It is possible to significantly reduce the time required for one measurement.
■ 加えて、従来にあっては回転ディスクの回転と停止
を交互に行なって幅広い粒度分布をもつ試料の測定を行
なっており、そのために一定回転に達するまでの間、一
定回転数から停止するまでの間の夫々の期間における粒
子の沈降という補正の困難な問題に直面せざるを得ない
が本発明におって＃−ｉＭ転ディスクの回転数を経時的
に連続して増大させるのでそのような困難な問題はなく
、正６１１な粒度分布測定が可能となる１゜■ In addition, in the past, samples with a wide range of particle size distributions were measured by rotating and stopping the rotating disk alternately. However, in the present invention, since the number of rotations of the #-iM rotation disk is continuously increased over time, such problems can be avoided. There are no difficult problems and it is possible to measure the particle size distribution with a 1°
第１図番ｊ本発明の方法を実施する装置をボナ図、第２
図は第１図の装置によって得られた検出ビータ及び回転
ディスクの時間的変化を小−ノ゛図である。。
＋１）・・・回転ディスク、（２）・・・試料セル、＋
６１・・快出祷。
１）・・・検出データ、Ｎ・・・回転数。
第１図
第２図
−−一一一−１Fig. 1 No. j The apparatus for implementing the method of the present invention is shown in Fig. 2.
The figure is a small diagram showing the temporal changes of the detection beater and rotating disk obtained by the apparatus of FIG. 1. . +1)...Rotating disk, (2)...Sample cell, +
61. Good luck. 1)...detection data, N...number of revolutions. Figure 1 Figure 2--111-1
Claims (1)
して増大させて試料セル内の試料粒子を加速度的に増大
する遠心重力によって沈降させるようにし、もって各瞬
時における回転ディスクの同転数及び回転開始時からそ
の瞬時までに要した時間並びに沈降面から一定距離はな
れた位置の粒子濃度を検出する検出器の各瞬時における
検出データの３者を演算処理して試料粒子の粒度分布を
求めるようにしたことを特徴とする遠心式粒度分布測定
方法。The rotation of the rotating disk in which the sample cell is installed is increased continuously over time so that the sample particles in the sample cell are sedimented by centrifugal gravity that increases at an accelerating rate. The particle size distribution of the sample particles is calculated by processing three factors: the time required from the start of rotation to that instant, and the detection data at each instant from the detector that detects the particle concentration at a position a certain distance from the settling surface. A centrifugal particle size distribution measuring method characterized by:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4486782A JPS58160843A (en) | 1982-03-18 | 1982-03-18 | Centrifugal measuring method of particle size distribution |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4486782A JPS58160843A (en) | 1982-03-18 | 1982-03-18 | Centrifugal measuring method of particle size distribution |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS58160843A true JPS58160843A (en) | 1983-09-24 |
| JPH0251134B2 JPH0251134B2 (en) | 1990-11-06 |
Family
ID=12703441
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4486782A Granted JPS58160843A (en) | 1982-03-18 | 1982-03-18 | Centrifugal measuring method of particle size distribution |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS58160843A (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS58165040A (en) * | 1982-03-25 | 1983-09-30 | Shimadzu Corp | Apparatus for measuring particle size distribution |
| JPS61175546A (en) * | 1985-01-30 | 1986-08-07 | Shimadzu Corp | Particle distribution measuring apparatus |
| US4671102A (en) * | 1985-06-18 | 1987-06-09 | Shell Oil Company | Method and apparatus for determining distribution of fluids |
| EP0392475A2 (en) * | 1989-04-11 | 1990-10-17 | Idemitsu Petrochemical Co. Ltd. | Analysis apparatus |
| EP0447060A2 (en) * | 1990-03-12 | 1991-09-18 | Beckman Instruments, Inc. | Optimal centrifugal separation |
| US5279150A (en) * | 1992-03-13 | 1994-01-18 | Katzer Albert E | Automated miniature centrifuge |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS58122447A (en) * | 1982-01-13 | 1983-07-21 | Ricoh Co Ltd | Measuring method of grain size distribution by light transmission type |
-
1982
- 1982-03-18 JP JP4486782A patent/JPS58160843A/en active Granted
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS58122447A (en) * | 1982-01-13 | 1983-07-21 | Ricoh Co Ltd | Measuring method of grain size distribution by light transmission type |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS58165040A (en) * | 1982-03-25 | 1983-09-30 | Shimadzu Corp | Apparatus for measuring particle size distribution |
| JPH0368336B2 (en) * | 1982-03-25 | 1991-10-28 | Shimadzu Corp | |
| JPS61175546A (en) * | 1985-01-30 | 1986-08-07 | Shimadzu Corp | Particle distribution measuring apparatus |
| JPH0797075B2 (en) * | 1985-01-30 | 1995-10-18 | 株式会社島津製作所 | Particle size distribution measuring device |
| US4671102A (en) * | 1985-06-18 | 1987-06-09 | Shell Oil Company | Method and apparatus for determining distribution of fluids |
| EP0392475A2 (en) * | 1989-04-11 | 1990-10-17 | Idemitsu Petrochemical Co. Ltd. | Analysis apparatus |
| EP0447060A2 (en) * | 1990-03-12 | 1991-09-18 | Beckman Instruments, Inc. | Optimal centrifugal separation |
| US5279150A (en) * | 1992-03-13 | 1994-01-18 | Katzer Albert E | Automated miniature centrifuge |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0251134B2 (en) | 1990-11-06 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US6219607B1 (en) | Method for determining an intersection-torque in a driving line of a vehicle with an automatic transmission | |
| CN105738807B (en) | A kind of high speed dynamic pressure gyro machine contacts to earth rotary speed test system | |
| JPS58160843A (en) | Centrifugal measuring method of particle size distribution | |
| FR2495313A1 (en) | LONGITUDINAL INCLINATION CALCULATION CIRCUIT FOR AN AIRCRAFT | |
| EP0160385B1 (en) | Particle size distribution measuring apparatus | |
| CN111089576A (en) | Method for determining actual output value of fiber-optic gyroscope and method for testing threshold value of fiber-optic gyroscope | |
| CN110763399A (en) | CT rotor static balance method | |
| DK2135040T3 (en) | Method and device for determining the value of a datum shift in a rotation speed sensor | |
| JP3349610B2 (en) | Load change measurement method | |
| EP0137317B1 (en) | Ultrasonic wave blood flow meter | |
| FR2500629A1 (en) | Centrifugal granulometric analysis appts. - uses centrifugal discs of which speed increases and measurement distance from axis of disc decreases w.r.t. time | |
| CN101233388B (en) | Abnormality detection device of optical fiber gyroscope | |
| US6215319B1 (en) | High accuracy measuring system | |
| JPS58165040A (en) | Apparatus for measuring particle size distribution | |
| JPH0679199A (en) | Displaying method for remaining time in centrifugal machine | |
| SU624134A1 (en) | Method of detecting different-size balls | |
| JPH0540070A (en) | Device for measuring unbalance of rotor | |
| JPS58160842A (en) | Light transmitting type measuring method of particle size distribution | |
| JPH08170721A (en) | Equipment and method of controlling shift operation of transmission | |
| JPS6010255B2 (en) | Method for detecting agglutination reactions in blood, etc. | |
| JPH08141440A (en) | Operation control device of centrifugal separator | |
| JP3048467B2 (en) | Phase detector | |
| ES483916A1 (en) | Method of and apparatus for rapidly measuring precipitation reaction of red corpuscle | |
| JPS63225173A (en) | Phase detector | |
| JPH0366620B2 (en) |