JPS5848049B2 - Liquid level detection device - Google Patents
Liquid level detection deviceInfo
- Publication number
- JPS5848049B2 JPS5848049B2 JP2982877A JP2982877A JPS5848049B2 JP S5848049 B2 JPS5848049 B2 JP S5848049B2 JP 2982877 A JP2982877 A JP 2982877A JP 2982877 A JP2982877 A JP 2982877A JP S5848049 B2 JPS5848049 B2 JP S5848049B2
- Authority
- JP
- Japan
- Prior art keywords
- liquid level
- light
- detection device
- level detection
- liquid
- 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
Landscapes
- Measurement Of Levels Of Liquids Or Fluent Solid Materials (AREA)
Description
【発明の詳細な説明】 本発明は液面検知装置に係る。[Detailed description of the invention] The present invention relates to a liquid level detection device.
従来、液面検知装置は液量を管理する上に必要不可欠の
ものとされ、数多くの方法が提案され、又実施されてい
るが、それらは外部からの直読式のもの、液面に浮子を
浮べてこれを機械的方法又は電気的方法で検知するもの
或いは複数の電極により、その電極間導通を知ることに
よb液面位を知る方法等が主たるものである。Conventionally, liquid level detection devices have been considered indispensable for controlling the liquid level, and many methods have been proposed and implemented. The main methods include floating the liquid and detecting it mechanically or electrically, or using a plurality of electrodes and determining the level of the liquid by determining the conduction between the electrodes.
本発明はか\る従来からの方法に依らず光学的な反射屈
折の原理を応用した新しい液面検知装置を提供すること
を目的とする。An object of the present invention is to provide a new liquid level detection device that applies the principle of optical catadioptric refraction without relying on such conventional methods.
以下図によって詳述すれば、,第1図Aは本発明の実施
例で、固定具1に設置づれた発光ダイオードなどによる
光源2から出た光は液面変位方向に対して微少変化する
が如き構造を有する光透過体3を経て感光素子4に至る
。To explain in detail with reference to the figures below, FIG. 1A shows an embodiment of the present invention, in which light emitted from a light source 2 such as a light emitting diode installed on a fixture 1 changes slightly with respect to the direction of liquid surface displacement. The light reaches the photosensitive element 4 through the light transmitting body 3 having such a structure.
この際、被検液5の水位6における光路断面積S−S’
が光源2の光を制限することになり、第1図の場合は水
位が上昇するほど受光される光量は増大する。At this time, the optical path cross-sectional area S-S' at the water level 6 of the test liquid 5
limits the light from the light source 2, and in the case of FIG. 1, the amount of light received increases as the water level rises.
この場合光透過体3の内部に座別シ部分7があればその
効果はよシ一層増大する。In this case, if there is a seat-separated portion 7 inside the light transmitting body 3, the effect will be further enhanced.
第1図Bは第1図Aに示す液面検知装置の側面図で、座
到り部分7の様子を示す。FIG. 1B is a side view of the liquid level detecting device shown in FIG. 1A, showing the seated portion 7. FIG.
なおその測定原理は明確には不明である。The measurement principle is not clearly known.
しかしその一つの仮定を液面位の高いときの概略断而図
を示す第1図C、および液面位の低いときの概略断面図
を示す第1図Dとによシ説明する。However, one of the assumptions will be explained with reference to FIG. 1C, which shows a schematic sectional view when the liquid level is high, and FIG. 1D, which shows a schematic sectional view when the liquid level is low.
すなわち液面位の高いときは第1図Cに示されるごとく
、光源2よジ出た光は光透過体3の外側面の全反射面で
反射しながら、光透過体3および該光透過体3と近い屈
折率を有する被検液5中を透過して、液面変位方向に対
して比較的鋭角にて感光素子4に受光される。That is, when the liquid level is high, as shown in FIG. The light passes through the test liquid 5 having a refractive index close to 3, and is received by the photosensitive element 4 at a relatively acute angle with respect to the liquid level displacement direction.
しかしながら液面位が低いとき、例えば第1図Dに示さ
れるごとく光透過体3が全く被検液に浸漬していない場
合には、光源2を出た光は光透過体3中をその外側面の
全反射面および内側面の界面にて多数回反射しながら感
光素子4の方向に進むが、反射する回数が多ければ多い
ほど、その光の液面変位方向となす角度は鈍角となり、
これより感光素子4に至らず、その周囲にて吸収される
光の量が多くなる。However, when the liquid level is low, for example when the light transmitting body 3 is not immersed in the test liquid as shown in FIG. The light travels toward the photosensitive element 4 while being reflected many times at the total reflection surface on the side surface and the interface on the inner surface, but the more times the light is reflected, the more obtuse the angle between the light and the liquid surface displacement direction becomes.
This increases the amount of light that does not reach the photosensitive element 4 and is absorbed around it.
第2図は本発明の応用例で、被検液5の貯蔵槽の壁部8
を光透過体となし、第1図に示す座別り部分7に相当す
る部分7′ヲ設けることによって同様な効果を得るもの
である。FIG. 2 shows an application example of the present invention, in which the wall 8 of the storage tank for the test liquid 5 is shown.
The same effect can be obtained by using a light transmitting member and providing a portion 7' corresponding to the seat part 7 shown in FIG.
即ち、この場合水位6′における光路断面積はS″に相
当し、水位の変化によって感光素子4における光量は変
化する。That is, in this case, the optical path cross-sectional area at the water level 6' corresponds to S'', and the amount of light at the photosensitive element 4 changes as the water level changes.
第3図はこれらの結果を光量の水位の関係としてグラフ
に表わしたもので、これをもとにして水位の変化を容易
に制御することが出来、その工業上の効果は犬である。FIG. 3 shows these results in a graph as a relationship between the amount of light and the water level. Based on this, changes in the water level can be easily controlled, and its industrial effects are significant.
第1図A,Bぱ本発明による液面検知装置の断面図及び
側面図、第1図C,Dは本発明の測定原理を示す概略断
面図、第2図は本発明装置を貯蔵槽に応用した場合の一
例を示す要部断面図、第3図は水位と光量との関係を示
すグラフである。
2:光源、3:光透過体、
S′・S′:光路断面積。
4
:感光素子、
SFigures 1A and B are cross-sectional views and side views of the liquid level detection device according to the present invention, Figures 1C and D are schematic cross-sectional views showing the measurement principle of the present invention, and Figure 2 is a schematic cross-sectional view of the liquid level detection device according to the present invention. FIG. 3 is a sectional view of a main part showing an example of an applied case, and is a graph showing the relationship between water level and light amount. 2: light source, 3: light transmitting body, S'/S': optical path cross-sectional area. 4: Photosensitive element, S
Claims (1)
検知装置において、該光透過体の光路断面積が、光源か
ら感光素子に行くに従って細〈なるごとく、液面変位方
向に対して微少変化する構或を有することを特徴とする
液面検知装置。1. In a liquid box detection device in which a light source and a photosensitive element are arranged with a light transmitting body in between, the optical path cross-sectional area of the light transmitting body becomes narrower from the light source to the photosensitive element with respect to the liquid level displacement direction. A liquid level detection device characterized by having a structure that changes slightly.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2982877A JPS5848049B2 (en) | 1977-03-17 | 1977-03-17 | Liquid level detection device |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2982877A JPS5848049B2 (en) | 1977-03-17 | 1977-03-17 | Liquid level detection device |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS53115265A JPS53115265A (en) | 1978-10-07 |
JPS5848049B2 true JPS5848049B2 (en) | 1983-10-26 |
Family
ID=12286877
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP2982877A Expired JPS5848049B2 (en) | 1977-03-17 | 1977-03-17 | Liquid level detection device |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5848049B2 (en) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3246340A1 (en) * | 1982-12-15 | 1984-06-20 | Westfälische Metall Industrie KG Hueck & Co, 4780 Lippstadt | DEVICE FOR MEASURING AND MONITORING THE LEVEL OF A LIQUID CONTAINER |
JPS635429U (en) * | 1986-06-27 | 1988-01-14 |
-
1977
- 1977-03-17 JP JP2982877A patent/JPS5848049B2/en not_active Expired
Also Published As
Publication number | Publication date |
---|---|
JPS53115265A (en) | 1978-10-07 |
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