JPH023940B2 - - Google Patents
Info
- Publication number
- JPH023940B2 JPH023940B2 JP56156864A JP15686481A JPH023940B2 JP H023940 B2 JPH023940 B2 JP H023940B2 JP 56156864 A JP56156864 A JP 56156864A JP 15686481 A JP15686481 A JP 15686481A JP H023940 B2 JPH023940 B2 JP H023940B2
- Authority
- JP
- Japan
- Prior art keywords
- memory
- blood cells
- particle size
- signal
- blood cell
- 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
Links
- 210000000601 blood cell Anatomy 0.000 claims description 37
- 230000015654 memory Effects 0.000 claims description 33
- 239000002245 particle Substances 0.000 claims description 23
- 238000009826 distribution Methods 0.000 claims description 20
- 230000007274 generation of a signal involved in cell-cell signaling Effects 0.000 claims description 7
- 238000001514 detection method Methods 0.000 claims description 6
- 230000001186 cumulative effect Effects 0.000 claims description 4
- 239000006285 cell suspension Substances 0.000 claims description 3
- 230000003287 optical effect Effects 0.000 claims description 2
- 210000001772 blood platelet Anatomy 0.000 description 30
- 210000003743 erythrocyte Anatomy 0.000 description 8
- 210000004369 blood Anatomy 0.000 description 6
- 239000008280 blood Substances 0.000 description 6
- 238000010586 diagram Methods 0.000 description 5
- 238000005259 measurement Methods 0.000 description 4
- 238000004820 blood count Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 230000009897 systematic effect Effects 0.000 description 2
- 206010027540 Microcytosis Diseases 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 210000000265 leukocyte Anatomy 0.000 description 1
- 239000013049 sediment Substances 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
Classifications
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06M—COUNTING MECHANISMS; COUNTING OF OBJECTS NOT OTHERWISE PROVIDED FOR
- G06M11/00—Counting of objects distributed at random, e.g. on a surface
- G06M11/02—Counting of objects distributed at random, e.g. on a surface using an electron beam scanning a surface line by line, e.g. of blood cells on a substrate
- G06M11/04—Counting of objects distributed at random, e.g. on a surface using an electron beam scanning a surface line by line, e.g. of blood cells on a substrate with provision for distinguishing between different sizes of objects
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Theoretical Computer Science (AREA)
- Investigating Or Analysing Biological Materials (AREA)
Description
【発明の詳細な説明】
本発明は、血小板数に与える赤血球の誤差また
は血小板自体のサイズの異状による影響を除去
し、より正確な血小板数を与えるようにした血小
板計数装置に関するものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a platelet counting device that eliminates the influence of errors in red blood cells or irregularities in the size of platelets themselves on the platelet count, and provides a more accurate platelet count.
血液中の赤血球、白血球、血小板などの血球の
うち、血小板のみを選び出し、計数測定するには
種々の方法がある。 There are various methods for selecting and counting only platelets from among blood cells such as red blood cells, white blood cells, and platelets in the blood.
従来用いられていた方法としては、血小板を前
処理し血小板を多く含む沈降層を取り出し、これ
を計数測定し前処理前の濃度に換算していた。こ
の方法は前処理段階で赤血球などの他の粒子から
血小板がすでに分離されているために、簡単な血
球計数装置で測定が可能である反面、前処理が必
要であるために手間と時間が必要であり、さらに
換算を行なわないと血小板数が得られないという
欠点があつた。 In the conventional method, platelets were pretreated, a sediment layer containing many platelets was taken out, counted and measured, and converted to the concentration before pretreatment. In this method, platelets are already separated from other particles such as red blood cells in the pretreatment step, so measurement can be performed using a simple blood cell counter, but the pretreatment required requires time and effort. However, there was a drawback that the platelet count could not be obtained without further conversion.
近年、分析装置の自動化が進み、血液を吸引さ
せるだけで分類計数測定が行なえるようになり、
血小板が赤血球や他の血球粒子よりも小さいとい
うことを利用し、血球粒子の大きさに比例した血
球信号を発生させ、所定の閾電圧を有する閾回路
を設け、閾電圧を越える粒子信号を血小板よりも
大きい血球による信号、閾電圧よりも小さい粒子
信号を血小板と判定し、選択計数を行なつてい
る。さらにノイズ信号と血小板信号とを区別する
ためにもう１つの閾電圧を設け、一般には２つの
閾電圧間の信号を血小板としている。この方法は
予め設定された閾電圧間の信号を通過させるため
に、血球検出装置に何らかの変動を生じたり、感
度が変化したり、あるいは大粒子である赤血球が
血小板にオーバラツプした検体などにおいては、
正確な血小板数を得ることができないという欠点
がある。とくに赤血球のパラメータであるMCV
（平均粒子容積）が70μ3以下の場合においては、
血小板そのものも小球性である場合があり、全体
に大きさが小さい方に片寄るために、血小板数の
値は勿論、赤血球数にも計数誤差を与え、臨床上
重大な影響を与えるという欠点があつた。 In recent years, automation of analyzers has progressed, and it has become possible to classify, count, and measure blood simply by aspirating blood.
Taking advantage of the fact that platelets are smaller than red blood cells and other blood cell particles, a blood cell signal proportional to the size of the blood cell particles is generated, and a threshold circuit with a predetermined threshold voltage is provided, and the particle signal exceeding the threshold voltage is detected as a platelet signal. Signals from blood cells larger than the threshold voltage and particle signals smaller than the threshold voltage are determined to be platelets, and selective counting is performed. Furthermore, another threshold voltage is provided to distinguish between a noise signal and a platelet signal, and generally a signal between the two threshold voltages is considered to be a platelet signal. This method passes signals between preset threshold voltages, so if there are any fluctuations in the blood cell detection device, sensitivity changes, or samples where large red blood cells overlap platelets, etc.
The drawback is that accurate platelet counts cannot be obtained. Especially MCV, which is a parameter of red blood cells.
(average particle volume) is 70μ3 or less,
Platelets themselves may also be microcytic, and their overall size tends to be smaller, which leads to counting errors not only in the platelet count but also in the red blood cell count, which has a serious clinical impact. It was hot.
本発明は上記の諸点に鑑みなされたもので、上
記欠点を解消して操作が明確で、より正確に血小
板数を計数することができる装置を提供せんとす
るものである。 The present invention has been made in view of the above points, and it is an object of the present invention to provide an apparatus which eliminates the above-mentioned drawbacks, is easy to operate, and is capable of more accurately counting the number of platelets.
以下、本発明の構成を図面に示す実施態様に基
づいて説明する。第１図は本発明の血小板計数装
置の一実施態様を示す系統的説明図である。本発
明の血小板計数装置は、血球と血球浮懸液との電
気的差異または光学的差異に基づいて血球を検出
し血球の大きさに比例した信号を発生する血球検
出装置１と、この血球検出装置１からの血球信号
に対して連続した複数個、たとえば50個あるいは
100個の閾値を有する比較回路２と、この比較回
路２の出力信号により血球の大きさを表わす信号
を発生させる信号発生回路３と、この信号発生回
路３に接続された演算・制御回路４と、この演
算・制御回路４に接続され演算や制御順序が記憶
された読出専用メモリ５と、前記演算・制御回路
４に接続された読出書込メモリ６，７，８、入力
装置９、表示装置１０および記録装置１１とを包
含している。前記読出書込メモリは第一メモリ
６、第二メモリ７および第三メモリ８からなり、
第一メモリ６には累積粒度分布または通常の粒度
分布の個数を記憶させ、第二メモリ７には％表示
の粒度分布を記憶させ、第三メモリ８には種々の
演算結果または演算結果から得られる分布曲線な
どを記憶させている。なお読出書込メモリ６，
７，８は理解を容易にするために別々に設けて図
示しているが、一個の読出書込メモリ１２を３つ
の領域に分割することも可能である。さらに前記
入力装置９には、前記表示装置１０のデイスプレ
イ上に２本のカーソル１３，１４を移動させこれ
らのカーソル１３，１４の位置表示を行なうため
の４個の押しボタンスイツチ１５，１６，１７，
１８が設けられ、カーソルの移動により種々の演
算のための条件を入力させるように構成してい
る。 Hereinafter, the configuration of the present invention will be explained based on embodiments shown in the drawings. FIG. 1 is a systematic explanatory diagram showing one embodiment of the platelet counting device of the present invention. The platelet counting device of the present invention includes a blood cell detection device 1 that detects blood cells based on an electrical difference or an optical difference between blood cells and a blood cell suspension, and generates a signal proportional to the size of the blood cells; A plurality of consecutive blood cells, for example 50 or
A comparison circuit 2 having 100 threshold values, a signal generation circuit 3 that generates a signal representing the size of blood cells based on the output signal of this comparison circuit 2, and an arithmetic/control circuit 4 connected to this signal generation circuit 3. , a read-only memory 5 connected to the calculation/control circuit 4 and storing calculations and control sequences, read/write memories 6, 7, 8 connected to the calculation/control circuit 4, an input device 9, and a display device. 10 and a recording device 11. The read/write memory consists of a first memory 6, a second memory 7 and a third memory 8,
The first memory 6 stores the cumulative particle size distribution or the number of normal particle size distributions, the second memory 7 stores the particle size distribution expressed as a percentage, and the third memory 8 stores various calculation results or information obtained from the calculation results. It stores information such as distribution curves. Note that the read/write memory 6,
Although 7 and 8 are shown separately provided for easy understanding, it is also possible to divide one read/write memory 12 into three areas. Further, the input device 9 includes four push button switches 15, 16, 17 for moving two cursors 13, 14 on the display of the display device 10 and displaying the positions of these cursors 13, 14. ，
18, and is configured to input conditions for various calculations by moving the cursor.
上記のように構成された血小板計数装置におい
て、血球検出装置１に血球信号が比較回路２に送
られると、その信号のピーク値またはピーク値ま
でのコンパレータがオンし、つぎの回路にはコン
パレータの数だけの出力端子で並列入力する。信
号発生回路３では、演算速度に合うように適当な
分周回路を端子数だけ並列接続するか、または一
つのパルスについて演算中にはつぎの血球信号の
入力を禁止するかにより、平均的な血球パルス間
隔の比較信号とし、各端子についてスキヤン（走
査）して血球のピーク値またはピーク値までのオ
ンしている回線を演算・制御回路４により、読出
専用メモリ５のプログラム順にしたがつて第一メ
モリ６に順次記憶させる。このとき血球のピーク
値について記憶させたものは通常の粒度分布曲線
であり、ピーク値までのオンしている回線のすべ
てを各血球について記憶させたものは累積の粒度
分布曲線となる。第一メモリ６の各番地は、血球
サイズすなわち閾値に対応するものであり、各番
地には血球の個数が記憶される。所定の血球浮懸
液の体積あるいは所定の時間の測定が終了する
と、読出専用メモリ５の演算順序にしたがつて第
一メモリ６の各番地が順次呼び出され、(1)血球の
総個数、(2)累積粒度分布の形で記憶されていると
きには隣接する番地間の血球数の差、通常の粒度
分布のときはその番地における血球数を読み出
し、(1)の血球の総個数で割り算を行ない、(3)第二
メモリ７の対応する各番地に演算結果を記憶させ
る、という操作が行なわれ、％表示の粒度分布曲
線が得られる。押しボタンスイツチは前述のよう
に４個設けられ、第２図に示すようにロウワー
（LOWER）２個、アツパー（UPPER）２個の２
対のスイツチが並んでいる。表示装置１０のデイ
スプレイ上には血小板の粒度分布曲線とともに、
２本のカーソル１３，１４が表示される。計数値
はこの２本のカーソル１３，１４の間の血球数で
ある。すなわち、一般の測定に際してはこれらの
２本のカーソル１３，１４は固定されていて、第
３図に示すように、たとえば2.4μ3、30.4μ3の位置
にセツトされている。通常の血小板はほぼこの範
囲内において分布するが、たとえばMCVが70μ3
の赤血球を有する血液においては、第３図に示す
ような小さい方に片寄つた粒度分布曲線が得られ
る。したがつて23.9万個／mm3という値が得られ
る。一方、表示装置１０の表示が第３図に示すよ
うに、明らかにカーソルの位置の不適正を示して
いるので、第２図に示す押しボタンスイツチ１
５，１６，１７，１８により閾電圧を修正する。
第２図に示す押しボタンスイツチにおいて、
LOWERの左の押しボタンスイツチ１５の押しボ
タンを押すと、第３図に示す左側のカーソル１３
が左方向へ移動する。このときのカーソル１３の
位置を示す数字がカーソルの移動につれて変動す
るとともに、画面下の血小板数を示す表示APLT
（アナライジングPLT）も変化する。すなわち、
カーソル１３を１番地分移動するごとに、その番
地の血小板数を読み出し、PLT値に加算し、
APLT値と表示することを番地が進むたびに繰り
返す。右側のカーソル１４をUPPERの左の押し
ボタンスイツチ１７の押しボタンを押すことによ
り左方へ移動させると、今度はメモリの各番地の
個数が読み出され、減算が行なわれる。以上のよ
うにして第４図に示すように、カーソルの位置を
最適と思われる位置にセツトすることにより、血
小板数のより正確な値を得ることができる。なお
正常な血液においては、第５図に示すように２つ
のカーソル１３，１４間にほぼおさまつた粒度分
布曲線が得られ、カーソルの移動は不要である。 In the platelet counting device configured as described above, when a blood cell signal from the blood cell detection device 1 is sent to the comparator circuit 2, the peak value of the signal or the comparator up to the peak value is turned on, and the comparator is turned on in the next circuit. Input in parallel using only a few output terminals. In the signal generation circuit 3, the average blood cell signal can be calculated by connecting an appropriate frequency dividing circuit in parallel with the number of terminals to match the calculation speed, or by prohibiting the input of the next blood cell signal while calculating one pulse. The pulse interval is used as a comparison signal, and each terminal is scanned and the peak value of blood cells or the line that is on up to the peak value is first read by the calculation/control circuit 4 in accordance with the program order of the read-only memory 5. The data are sequentially stored in the memory 6. At this time, what is stored for the peak value of blood cells is a normal particle size distribution curve, and what is stored for each blood cell by all the lines that are turned on up to the peak value is a cumulative particle size distribution curve. Each address of the first memory 6 corresponds to a blood cell size, that is, a threshold value, and each address stores the number of blood cells. When the measurement of a predetermined volume of blood cell suspension or a predetermined time period is completed, each address of the first memory 6 is sequentially read in accordance with the calculation order of the read-only memory 5, and (1) the total number of blood cells, ( 2) When stored in the form of cumulative particle size distribution, read the difference in blood cell counts between adjacent addresses, and when the particle size distribution is normal, read the blood cell count at that address, and divide by the total number of blood cells in (1). , (3) Storing the calculation results in the corresponding addresses of the second memory 7 are performed, and a particle size distribution curve expressed as a percentage is obtained. There are four push button switches as mentioned above, two for LOWER and two for UPPER as shown in Figure 2.
Pairs of switches are lined up. On the display of the display device 10, together with the platelet particle size distribution curve,
Two cursors 13 and 14 are displayed. The count value is the number of blood cells between these two cursors 13 and 14. That is, during general measurements, these two cursors 13 and 14 are fixed, and are set, for example, at positions of 2.4μ 3 and 30.4μ 3 as shown in FIG. Normal platelets are distributed within this range, but for example, the MCV is 70 μ 3
In blood containing 1,000 red blood cells, a particle size distribution curve biased toward the smaller side as shown in FIG. 3 is obtained. Therefore, a value of 239,000 pieces/mm 3 is obtained. On the other hand, as shown in FIG. 3, the display on the display device 10 clearly indicates that the cursor position is incorrect, so the push button switch 1 shown in FIG.
5, 16, 17, and 18 to correct the threshold voltage.
In the push button switch shown in Fig. 2,
When the push button on the left push button switch 15 of LOWER is pressed, the left cursor 13 shown in FIG.
moves to the left. At this time, the number indicating the position of the cursor 13 changes as the cursor moves, and the display indicating the platelet count at the bottom of the screen APLT
(Analyzing PLT) also changes. That is,
Every time the cursor 13 is moved one address, the platelet count at that address is read out and added to the PLT value.
Repeat displaying the APLT value each time the address advances. When the right cursor 14 is moved to the left by pressing the push button on the left push button switch 17 of UPPER, the number at each address in the memory is read out and subtraction is performed. As described above, as shown in FIG. 4, by setting the cursor to a position considered to be optimal, a more accurate value of the platelet count can be obtained. Note that in normal blood, as shown in FIG. 5, a particle size distribution curve that is approximately settled between the two cursors 13 and 14 is obtained, and there is no need to move the cursor.
以上説明したように、本発明の装置において
は、最適な閾値の設定や修正をモニタブラウン管
に表示される粒度分布曲線と同時に表示されるカ
ーソルを直視し、移動させながら行なうことがで
き、さらにそのときの訂正された血小板数を直読
することができ、また各検体において、カーソル
を移動させるまではいつも同一条件での測定が得
られ（次の検体に移ると、もとの条件に復帰す
る）、さらに数値による条件入力と異なり一目瞭
然であり、設定も容易であるなどの効果を奏す
る。 As explained above, in the apparatus of the present invention, the optimal threshold value can be set and corrected by directly viewing and moving the cursor that is displayed simultaneously with the particle size distribution curve displayed on the monitor cathode ray tube. You can directly read the corrected platelet count at the time, and measurements are always obtained under the same conditions for each sample until you move the cursor (when you move on to the next sample, it returns to the original conditions) Furthermore, unlike inputting conditions using numerical values, it is self-explanatory and easy to set.
第１図は本発明の血小板計数装置の一実施態様
を示す系統的説明図、第２図は入力装置に設けら
れた押しボタンスイツチの説明図、第３図および
第４図は表示装置における操作の一例を示す説明
図、第５図は正常な血液の場合の粒度分布曲線で
ある。
１……血球検出装置、２……比較回路、３……
信号発生回路、４……演算・制御回路、５……読
出専用メモリ、６……第一メモリ、７……第二メ
モリ、８……第三メモリ、９……入力装置、１０
……表示装置、１１……記録装置、１２……読出
書込メモリ、１３，１４……カーソル、１５，１
６，１７，１８……押しボタンスイツチ。
FIG. 1 is a systematic explanatory diagram showing one embodiment of the platelet counting device of the present invention, FIG. 2 is an explanatory diagram of a push button switch provided on an input device, and FIGS. 3 and 4 are operation diagrams on a display device. FIG. 5 is an explanatory diagram showing an example of the particle size distribution curve of normal blood. 1... Blood cell detection device, 2... Comparison circuit, 3...
Signal generation circuit, 4... Arithmetic/control circuit, 5... Read-only memory, 6... First memory, 7... Second memory, 8... Third memory, 9... Input device, 10
... Display device, 11 ... Recording device, 12 ... Read/write memory, 13, 14 ... Cursor, 15, 1
6, 17, 18...Push button switch.
Claims (1)
的差異に基づいて血球を検出し血球の大きさに比
例した信号を発生する血球検出装置と、この血球
検出装置からの血球信号に対して連続した複数個
の閾値を有する比較回路と、この比較回路の出力
信号により血球の大きさを表わす信号を発生させ
る信号発生回路と、この信号発生回路に接続され
た演算・制御回路と、この演算・制御回路に接続
され演算や制御順序が記憶された読出専用メモリ
と、前記演算・制御回路に接続された読出書込メ
モリ、入力装置、表示装置および記録装置とを包
含し、前記読出書込メモリは第一メモリ、第二メ
モリおよび第三メモリからなり、第一メモリには
累積粒度分布または通常の粒度分布の個数分布が
記憶され、第二メモリには％表示の粒度分布が記
憶され、第三メモリには種々の演算結果または演
算結果から得られる分布曲線などが記憶され、さ
らに前記入力装置に前記表示装置のデイスプレイ
上に２本のカーソルを移動させこれらのカーソル
の位置表示を行なうための４個の押しボタンスイ
ツチを設け、表示装置のデイスプレイ上に血小板
に対応する粒度分布曲線を得るとともに、２本の
カーソルが表示され、これらのカーソルを移動さ
せることにより、メモリの各番地の血球数を読み
出し、加減算を行なつて修正された血小板数を得
るようにしてなることを特徴とする血小板計数装
置。1. A blood cell detection device that detects blood cells based on electrical or optical differences between blood cells and a blood cell suspension and generates a signal proportional to the size of the blood cells, and a blood cell signal from this blood cell detection device. A comparison circuit having a plurality of continuous threshold values, a signal generation circuit that generates a signal representing the size of blood cells based on the output signal of this comparison circuit, an arithmetic/control circuit connected to this signal generation circuit, and a computation/control circuit connected to this signal generation circuit.・Includes a read-only memory connected to a control circuit and storing calculations and control sequences, a read-write memory, an input device, a display device, and a recording device connected to the calculation/control circuit; The memory consists of a first memory, a second memory, and a third memory, the first memory stores the cumulative particle size distribution or the number distribution of the normal particle size distribution, the second memory stores the particle size distribution expressed in %, The third memory stores various calculation results or distribution curves obtained from the calculation results, and the input device is used to move two cursors on the display of the display device to display the positions of these cursors. A particle size distribution curve corresponding to platelets is obtained on the display of the display device, and two cursors are displayed. By moving these cursors, blood cells at each address in the memory can be displayed. A platelet counting device characterized in that the platelet count is read out and added and subtracted to obtain a corrected platelet count.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP56156864A JPS5858439A (en) | 1981-10-01 | 1981-10-01 | Counting apparatus of thrombocyte |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP56156864A JPS5858439A (en) | 1981-10-01 | 1981-10-01 | Counting apparatus of thrombocyte |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5858439A JPS5858439A (en) | 1983-04-07 |
| JPH023940B2 true JPH023940B2 (en) | 1990-01-25 |
Family
ID=15637053
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP56156864A Granted JPS5858439A (en) | 1981-10-01 | 1981-10-01 | Counting apparatus of thrombocyte |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5858439A (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63105989A (en) * | 1986-10-22 | 1988-05-11 | Electroplating Eng Of Japan Co | Injection plating device |
| JP5010443B2 (en) * | 2006-12-20 | 2012-08-29 | シスメックス株式会社 | Blood cell analyzer and blood cell analysis method |
| JP2012147142A (en) * | 2011-01-11 | 2012-08-02 | Panasonic Corp | Stereoscopic image display system, stereoscopic image display method, stereoscopic image display device, and illumination device |
-
1981
- 1981-10-01 JP JP56156864A patent/JPS5858439A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5858439A (en) | 1983-04-07 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US4021117A (en) | Process for automatic counting and measurement of particles | |
| US4110604A (en) | Particle density measuring system | |
| US4488248A (en) | Particle size distribution analyzer | |
| US3439267A (en) | Automatic hematocrit measuring apparatus | |
| US3786352A (en) | Rate analysis system with overrange signal detection circuit for identifying false signals | |
| JPH023940B2 (en) | ||
| CA1091350A (en) | Particle-density measuring system | |
| JPS6166950A (en) | Data processing unit for automatic blood analysis instrument | |
| US3365931A (en) | Data processing system for a gas chromatograph | |
| US4418313A (en) | Process and circuit arrangement for the determination in a diluted blood sample of the number of red blood corpuscles, the mean cell volume, the value of haematocrit and other blood parameters | |
| US4314346A (en) | Auxiliary apparatus for a particle analyser | |
| JP2676089B2 (en) | Particle size distribution processor | |
| JPH0225134B2 (en) | ||
| JPH0147731B2 (en) | ||
| JPS6229014B2 (en) | ||
| JPS6239374B2 (en) | ||
| JPS6142816B2 (en) | ||
| JP2668062B2 (en) | Particle counting method and device | |
| JPS6142817B2 (en) | ||
| JPH07181265A (en) | Radioactive ray measuring instrument | |
| JPH052094B2 (en) | ||
| JP2676087B2 (en) | Particle size distribution processor | |
| JPS5810602A (en) | Deviation analyzer for slugs of filament | |
| JPS61126447A (en) | Particle analyzing instrument | |
| SU1447931A1 (en) | Apparatus for determining corrosion hazard of medium |