JPS59122991A - Liquid sensor - Google Patents

Liquid sensor

Info

Publication number
JPS59122991A
JPS59122991A JP57230156A JP23015682A JPS59122991A JP S59122991 A JPS59122991 A JP S59122991A JP 57230156 A JP57230156 A JP 57230156A JP 23015682 A JP23015682 A JP 23015682A JP S59122991 A JPS59122991 A JP S59122991A
Authority
JP
Japan
Prior art keywords
liquid
light
sending tube
tube
photo
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
Application number
JP57230156A
Other languages
Japanese (ja)
Inventor
Yoshiaki Oosugi
大杉　義彰
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Shimadzu Corp
Shimazu Seisakusho KK
Original Assignee
Shimadzu Corp
Shimazu Seisakusho KK
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Shimadzu Corp, Shimazu Seisakusho KK filed Critical Shimadzu Corp
Priority to JP57230156A priority Critical patent/JPS59122991A/en
Publication of JPS59122991A publication Critical patent/JPS59122991A/en
Pending legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
    • G01V8/00—Prospecting or detecting by optical means
    • G01V8/10—Detecting, e.g. by using light barriers
    • G01V8/12—Detecting, e.g. by using light barriers using one transmitter and one receiver

Abstract

PURPOSE:To adequately detect a liquid, by providing a light source and a light detector so as to interpose a liquid sending tube therebetween while positioning the light detector at the focus position of a lens formed by the presence of a liquid in the liquid sending tube. CONSTITUTION:LED3 as a light source and a photo-transistor 4 as a light detector are proided in opposed relationship so as to interpose a transparent liquid sending tube 2 made of FEP therebetween. In this case, the liquid sending tube 2 has no light collecting action when a liquid is absent in the liquid sending tube 2 but performs lens action when a liquid L enters the liquid sending tube 2 to collect light from LED3 onto one focus. The photo-transistor 4 is positioned at an almost focal point. Whereupon, the difference of light intensity is generated on the photo-transistor 4 by the presence and absence of the liquid L. By this mechanism, the liquid can be adequately detected even if the attenuation due to the liquid is low.

Description

【発明の詳細な説明】 この発明は、液の有無を検知する液センサに関し、さら
に詳しくは、送液チューブ内に液があるか否かを光学的
に検知する液センサに関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a liquid sensor that detects the presence or absence of a liquid, and more particularly to a liquid sensor that optically detects whether or not a liquid is present in a liquid sending tube.

化学合成装置において、溶媒や試薬がａ！実に送液され
ているか否かを常時モニタすることは、装置の信頼性を
向上するために重要である。このようなモニタの一つの
手段として、装置の送液チューブ内に液があるか否かを
検知する液センサが考えられる。In chemical synthesis equipment, solvents and reagents are a! It is important to constantly monitor whether or not liquid is actually being fed in order to improve the reliability of the device. One possible means for such monitoring is a liquid sensor that detects whether or not there is liquid in the liquid feeding tube of the device.

ところで従来、光学的に液の有無を検知する液センサと
して、測定光が液中を通ることで生ずる減衰を利用して
検知する方式のものがあった。すなわち、この方式は、
液がある場合には、液により測定光が吸収および散乱さ
れるので、液がない場合に比べて透過光強度が低下する
が、これを検知して液の有無を知るのである。By the way, conventionally, as a liquid sensor that optically detects the presence or absence of a liquid, there has been a type that detects the presence or absence of a liquid by using attenuation that occurs when measurement light passes through the liquid. In other words, this method:
If there is a liquid, the measuring light is absorbed and scattered by the liquid, so the intensity of the transmitted light is lower than when there is no liquid, but this is detected to know whether the liquid is present.

しかし、この方式は、液による測定光の減衰が小さいほ
どＳ／Ｎ比が悪くなる傾向があシ、液の透過度が高い場
合あるいは充分減衰させうるほど液中の光路をとれない
場合には好適に液を検知できない欠点がある。However, with this method, the smaller the attenuation of the measurement light by the liquid, the worse the S/N ratio tends to be. There is a drawback that liquid cannot be detected properly.

この発明は、上記欠点を解消すべくなされたもので、上
記従来装置とは逆に液による減衰が小さいほどＳ／Ｎ比
を向上しうる方式の液センサを提供する。The present invention was made in order to eliminate the above-mentioned drawbacks, and provides a liquid sensor of a type in which, contrary to the above-mentioned conventional device, the S/N ratio can be improved as the attenuation due to the liquid is smaller.

以下、図に示す実施例に基いて、この発明全詳説する。Hereinafter, this invention will be fully explained in detail based on the embodiments shown in the drawings.

なお、これによりこの発明が限定されるものではない。Note that this invention is not limited to this.

第１図および第２図に示す（１）は、この発明の液セン
サの一実施例であ漫、ＦＥＰ製の透明な送液チューブ（
２）をはさんで光源のＬＥＤ　（３）と光検出器のフォ
トトランジスタ（４）とが対向して設けられている。Ｌ
ＥＤ（３）とフォトトランジスタ（４）とはプラスチッ
ク製ボディ（５）で一体化され、またそのボディ（５）
と送液チューブ（２）とはホルダ（６）で一体化されて
いる。(1) shown in FIGS. 1 and 2 is an embodiment of the liquid sensor of the present invention, and a transparent liquid sending tube made of FEP (
2), an LED (3) as a light source and a phototransistor (4) as a photodetector are provided facing each other. L
The ED (3) and the phototransistor (4) are integrated with a plastic body (5), and the body (5)
and the liquid feeding tube (2) are integrated by a holder (6).

送液チューブ（２）は、第２図（ａ）に示すように、送
液チューブ（２）内に液がないときＫはＬＥＤ（３）か
らの光を集める働きをしない。ところが、第２図（ｂ）
に示すように、送液チューブ（２）内に液（Ｌ）が入る
と、レンズの作用を行って、ＬＥＤ　（３）からの光を
一つの焦点上に集光する。フォトトランジスタ（４）は
その略焦点の位置に位置せしめられている。そこで、液
（Ｌ）の有無によってフォトトランジスタ（４）上で光
強度に差異を生ずる。すなわち、液（Ｌ）がある場合は
、液がない場合よシも光強度が大きくなる。したがって
、フォトトランジスタ（４）の出力から容易に液（Ｌ）
の有無を判定できることは明らかである。As shown in FIG. 2(a), the liquid feeding tube (2) does not function to collect light from the LED (3) when there is no liquid in the liquid feeding tube (2). However, Fig. 2(b)
As shown in , when the liquid (L) enters the liquid feeding tube (2), it acts as a lens and focuses the light from the LED (3) onto one focal point. The phototransistor (4) is positioned approximately at its focal point. Therefore, a difference occurs in the light intensity on the phototransistor (4) depending on the presence or absence of the liquid (L). That is, when there is liquid (L), the light intensity becomes higher than when there is no liquid. Therefore, the liquid (L) can be easily obtained from the output of the phototransistor (4).
It is clear that the presence or absence of can be determined.

なお、送液チューブ（２）の好適な寸法は、内径０．５
　ｔｔｔｍ　”　１．５　ｕｒｎ　＋肉厚０．２５前後
である。好適な素材は、別」、ガラス等である。The preferred dimensions of the liquid feeding tube (2) are an inner diameter of 0.5
tttm 1.5 urn + wall thickness around 0.25 mm. Suitable materials include glass, etc.

第３図は、この発明の液センサの特性測定回路を示すも
のである。送液チューブ（２つとして内径０．５鰭、肉
厚０．２５鱈のＦＥＰチューブを用い、ＬＥＤ（３つお
よびフォトトランジスタ（４りとして立方電機製フォト
マイクロセンサ（オムロンＥＥ−ＳＧ３）を用いた。Ｌ
ＥＤ　（３りは高さ２．１　ｍ　＋幅０−５　ｍのスリ
ットから赤外光を放出し、フォトトランジスタ（４）は
同様のスリットヲ通して光ｔ−受は入れる。これらスリ
ットの間隔は３．４鱈で、送液チューブ（２りはスリッ
ト間の中央を幅方向に通っている。FIG. 3 shows a characteristic measuring circuit for a liquid sensor according to the present invention. Liquid feeding tubes (2 FEP tubes with an inner diameter of 0.5 fin and wall thickness of 0.25 fin were used, and 3 LEDs and a phototransistor (4) were used as photomicrosensors made by Cubic Denki (Omron EE-SG3). There was L.
ED (3) emits infrared light from a slit with a height of 2.1 m and a width of 0-5 m, and a phototransistor (4) receives light through a similar slit.The spacing between these slits is 3.4 For cod, the liquid feeding tube (2) passes through the center between the slits in the width direction.

測定結果は次のようであった。The measurement results were as follows.

第４図に示す（１１）は、この発明の液センサを用いた
定量装置である。透明の送液チューブ（１２）の一端に
三方弁（１７〕のＯＯＭが接続され、その一端よシ所定
距離のところに光学式の液センサ（１１）が設けられて
いる。はじめに三方弁（１７）のＮｏ側のチューブ（１
日）よシ送液チューブ（１２）内に送液用ガス（たとえ
ばＮ２ガス）を満たし、次に三方弁（１７）のＮｏ側の
チューブ（１９）より送液チューブ（１２）内に液を供
給する。そして液が液センサ（１１）で検知されたとき
に三方弁（１７）を切り換えてＮｏ側よシ送液ガスを供
給するようにする。(11) shown in FIG. 4 is a quantitative device using the liquid sensor of the present invention. An OOM of a three-way valve (17) is connected to one end of the transparent liquid feeding tube (12), and an optical liquid sensor (11) is provided at a predetermined distance from the one end. ) No side tube (1
1) Fill the liquid feeding tube (12) with liquid feeding gas (for example, N2 gas), and then pour the liquid into the liquid feeding tube (12) from the tube (19) on the No side of the three-way valve (17). supply When the liquid is detected by the liquid sensor (11), the three-way valve (17) is switched to supply liquid gas to the No side.

そうすると、送液チューブ（１２）の一端から液センサ
（１１）の位置までの間の容量の液が定量されることに
なる。そこで一定量の液を好適に送液することか可能と
なる。この量は、送液チューブ（１２）の径を変えたシ
、また液センサ（１１）の位置を変えることで増減でき
る。Then, the volume of liquid between one end of the liquid feeding tube (12) and the position of the liquid sensor (11) is determined. Therefore, it becomes possible to suitably send a certain amount of liquid. This amount can be increased or decreased by changing the diameter of the liquid feeding tube (12) or by changing the position of the liquid sensor (11).

以上の説明から理解されるように、この発明は、送液チ
ューブ金はさんで光源と光検出器とを対向して設置する
とともに１送液チユーブ中に液が存在することによって
形成されるレンズの略焦点位置に光検出器を位置せしめ
、その光検出器にてチューブ中を透過する光の強度を検
出し、その光強度の差異によシ液の有無を検知すること
を特徴とする液センサを提供するものであり、これによ
って、液による減衰が小さい場合でも好適に液を検知で
きるようになる。As can be understood from the above description, the present invention provides a lens formed by installing a light source and a photodetector facing each other with gold sandwiched between the liquid feeding tubes and the presence of liquid in one liquid feeding tube. A photodetector is positioned approximately at the focal point of the tube, the photodetector detects the intensity of light transmitted through the tube, and the presence or absence of liquid is detected based on the difference in the light intensity. The present invention provides a sensor that can suitably detect liquid even when attenuation due to liquid is small.

【図面の簡単な説明】[Brief explanation of the drawing]

第１図はこの発明の液センサの一実施例の外観斜視図、
第２図はその作動説明図である。 第３図はこの発明の液センサの特性測定用回路図である
。 第４図はこの発明の液センサを好適に用いうる定量装置
の構成説明図である。 （１）・・・液センサ、（２）・・・送液チューブ、（
３）・・・　ＬＥＤ、　　　　（４）・・・　フォトト
ランジスタ、（す・・・ボディ、（す・・・ホルダ、（
Ｌ）・・・液。 （ｐ　　　」FIG. 1 is an external perspective view of an embodiment of the liquid sensor of the present invention;
FIG. 2 is an explanatory diagram of its operation. FIG. 3 is a circuit diagram for measuring characteristics of the liquid sensor of the present invention. FIG. 4 is an explanatory diagram of the configuration of a quantitative device in which the liquid sensor of the present invention can be suitably used. (1)...Liquid sensor, (2)...Liquid feeding tube, (
3)... LED, (4)... Phototransistor, (S...Body, (S...Holder, (
L)...liquid. (p"

Claims (1)

【特許請求の範囲】[Claims] １、送液チューブをはさんで光源と光検出器とを対向し
て設置するとともに、送液チューブ中に液が存在するこ
とによって形成されるレンズの略焦点位置に光検出器を
位置せしめ、その光検出器にてチューブ中を透過する光
の強度を検出し、その光強度の差異によシ液の有無を検
知することを特徴とする液センサ。1. A light source and a photodetector are installed facing each other across the liquid feeding tube, and the photodetector is positioned approximately at the focal point of the lens formed by the presence of the liquid in the liquid feeding tube. A liquid sensor characterized in that the photodetector detects the intensity of light transmitted through the tube, and the presence or absence of liquid is detected based on the difference in the light intensity.
JP57230156A 1982-12-29 1982-12-29 Liquid sensor Pending JPS59122991A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP57230156A JPS59122991A (en) 1982-12-29 1982-12-29 Liquid sensor

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP57230156A JPS59122991A (en) 1982-12-29 1982-12-29 Liquid sensor

Publications (1)

Publication Number Publication Date
JPS59122991A true JPS59122991A (en) 1984-07-16

Family

ID=16903468

Family Applications (1)

Application Number Title Priority Date Filing Date
JP57230156A Pending JPS59122991A (en) 1982-12-29 1982-12-29 Liquid sensor

Country Status (1)

Country Link
JP (1) JPS59122991A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6687004B1 (en) 1999-10-22 2004-02-03 Marquette University Optical sensor for opaque and non-opaque materials

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6687004B1 (en) 1999-10-22 2004-02-03 Marquette University Optical sensor for opaque and non-opaque materials

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