JPH11142532A - Three electrodes type rainfall detecting system - Google Patents
Three electrodes type rainfall detecting systemInfo
- Publication number
- JPH11142532A JPH11142532A JP9349899A JP34989997A JPH11142532A JP H11142532 A JPH11142532 A JP H11142532A JP 9349899 A JP9349899 A JP 9349899A JP 34989997 A JP34989997 A JP 34989997A JP H11142532 A JPH11142532 A JP H11142532A
- Authority
- JP
- Japan
- Prior art keywords
- electrode
- rainfall
- condensation
- case
- signal
- 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
Landscapes
- Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)
- Measurement Of Resistance Or Impedance (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】この発明はビニールハウス等
の制御に於いて降雨が有るか無いかを電気的に検出する
センサー及びセンサー用ＯＮ／ＯＦＦ変換アンプに関す
るものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sensor for electrically detecting whether or not there is rain in the control of a greenhouse or the like, and an ON / OFF conversion amplifier for the sensor.
【０００２】[0002]
【従来の技術】従来、降雨を検出するには図１のように
降雨検出センサーを雨が降りかかる場所に設置してお
き、ＯＮ／ＯＦＦ変換アンプとを組み合わせ、動作させ
ている。動作原理は図２のようにセンサー上に電極と
電極を設けておき、電極と電極の間に雨水がかか
ると電極間の抵抗値が変化する（少なくなる）ことを検
知する事であった。2. Description of the Related Art Conventionally, in order to detect rainfall, a rainfall detection sensor is installed in a place where rainfall starts as shown in FIG. 1, and is operated in combination with an ON / OFF conversion amplifier. The principle of operation was to provide electrodes and electrodes on the sensor as shown in FIG. 2, and to detect that the resistance value between the electrodes changes (decreases) when rainwater is applied between the electrodes.
【０００３】[0003]
【発明が解決しようとする課題】この今までの方式では
少量の降雨でも動作するように感度を高く設定すると、
この電極間に露が付着した時や降雨と言えない程の降雨
時も降雨と判断してしまい、本当はビニールハウスなど
の窓を開けなければいけないときに閉じたままになり、
ビニールハウス内部の温度が異常に上昇し弊害をもたら
していた。また、結露ほどでは動作しないように感度を
低く設定すると雨水の導電率は一定ではないために雨水
の抵抗値が高かった場合には降雨時に検出できず、窓を
閉めなければいけないときに窓が閉まらずビニールハウ
ス内部の作物に被害をもたらすといった不都合があり、
季節による降雨の状況や結露の状態に合わせて設定を変
えてやる必要があった。In the conventional method, if the sensitivity is set high so as to operate even in a small amount of rainfall,
When dew adheres between these electrodes or when it is raining that can not be said to be rain, it will be judged as rain, and it will be closed when windows such as greenhouses must be opened,
The temperature inside the greenhouse rose abnormally, causing adverse effects. Also, if the sensitivity is set low so that it does not operate as much as condensation, the conductivity of rainwater is not constant, so if the resistance value of rainwater is high, it can not be detected at the time of rainfall, and the window will be opened when the window must be closed. There are inconveniences such as damaging crops inside the greenhouse without closing,
It was necessary to change the settings according to the seasonal rainfall conditions and dew condensation conditions.
【０００４】[0004]
【課題を解決するための手段】本発明は、その欠点を取
り除くためになされたもので、これを図面について説明
すると図３のように従来からあった２本の電極の間に第
３の電極を設け、これをＯＮ／ＯＦＦの信号に変換する
アンプの接地側に接続する。SUMMARY OF THE INVENTION The present invention has been made in order to eliminate the disadvantages. Referring to the drawings, a third electrode is provided between two conventional electrodes as shown in FIG. Is connected to the ground side of an amplifier that converts the signal into an ON / OFF signal.
【０００５】[0005]
【発明の実施の形態】すると図４にて示されるように結
露程度では電極から出た信号は電極の方へ行かず電
極で接地側へ流れ込んでしまう。このことにより結
露、又は結露程度の降雨では変換アンプは動作しなくな
る。次に多量の雨が降るときは図５のように電極から
電極へ向かう電気回路の他に降雨による大きな水滴に
より電極から電極へ向かう電気回路ができる、この
回路を通ってくる信号を検出することにより降雨を確実
に検出することが出来る。また、結露時や少量の降雨時
にも電極から電極へ向かう電気回路が出来ないわけ
ではないが抵抗値が高いためと電気の性質として近い方
の電極に流れ込んでしまうのでこれを無視することが
出来る。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS As shown in FIG. 4, when the degree of dew is high, a signal output from an electrode does not go to the electrode but flows to the ground at the electrode. As a result, the conversion amplifier does not operate in the case of dew condensation or rainfall of the degree of dew condensation. Next, when a large amount of rain falls, in addition to the electric circuit from the electrode to the electrode as shown in FIG. 5, an electric circuit from the electrode to the electrode is formed by a large water drop due to rainfall. Detecting a signal passing through this circuit This makes it possible to reliably detect rainfall. Also, it is not impossible to form an electric circuit from electrode to electrode even at the time of dew condensation or a small amount of rainfall, but since it has a high resistance value and it flows into the closer electrode as an electric property, this can be ignored .
【０００６】[0006]
【実施例】このことにより結露や検出する必要のない小
雨の時も、また、是非検出すべき降雨の時も安定して変
換アンプが動作し、外部へ降雨が始まったことを告げる
信号を出すことができる。また、センサー部にあっては
プリント基板上に電極を櫛形に対向させた形にすること
によって検出部分の面積を大きく取ることができ、セン
サーを小型に製作することができる。[Embodiment] The conversion amplifier operates stably even in the case of light rain that does not require dew condensation or detection, and also in the case of rainfall to be detected by all means, and outputs a signal to the outside to notify that rain has started. be able to. In the sensor section, the area of the detection portion can be increased by forming the electrodes on the printed circuit board in a comb shape, and the sensor can be manufactured in a small size.
【０００７】[0007]
【発明の効果】本発明により、結露や少降雨時の事を気
にせずに変換アンプの感度を常に高く保持することがで
きるので雨水の抵抗値が多少変化しても従来のように結
露を気にしながらいちいち感度の設定を変更する必要が
無くなる。According to the present invention, the sensitivity of the conversion amplifier can always be kept high without worrying about dew condensation or light rainfall. There is no need to change the sensitivity setting while worrying.
【図１】降雨を検知するための基本的システム構成図FIG. 1 is a basic system configuration diagram for detecting rainfall.
【図２】従来センサーの電極部分の拡大断面図。FIG. 2 is an enlarged sectional view of an electrode portion of a conventional sensor.
【図３】本発明によるセンサーの電極部分の拡大断面
図。FIG. 3 is an enlarged sectional view of an electrode portion of the sensor according to the present invention.
【図４】本発明によるセンサーの電極部分に結露が発生
したときの結露による抵抗の発生状態を説明したもので
ある。FIG. 4 is a view for explaining a state in which resistance is generated due to dew condensation when dew condensation occurs in an electrode portion of a sensor according to the present invention.
【図５】本発明によるセンサーの電極部分に雨滴が付着
したときの雨水による抵抗の発生状態を説明したもので
ある。FIG. 5 is a view for explaining a state of generation of resistance due to rainwater when raindrops adhere to an electrode portion of a sensor according to the present invention.
図中にて は検出用電極の一方、は検出用電極のも
う片方を示す。また、は本発明で追加された第３の電
極を、は検出用変換アンプ内に設けられた検出に必要
な電源を示す。図では便宜上直流で示してあるが交流で
あっても差し支えない。更にジグザグの記号は結露、雨
滴によって発生した抵抗値を持った電気回路を示す。矢
印は電流の流れる向き、回路を示す。In the drawing, one of the detection electrodes and the other of the detection electrodes are shown. Further, indicates a third electrode added in the present invention, and indicates a power supply required for detection provided in the conversion amplifier for detection. In the figure, DC is shown for convenience, but AC may be used. Further, the zigzag symbol indicates an electric circuit having a resistance value generated by condensation or raindrops. Arrows indicate the direction of current flow and the circuit.
Claims (2)
サー1. A rainfall sensor having three electrodes on a rainwater detection surface.
地）の端子を設けたセンサー用ＯＮ／ＯＦＦ変換アン
プ。2. An ON / OFF conversion amplifier for a sensor having a zero potential (ground) terminal serving as a reference voltage for detection at an input.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9349899A JPH11142532A (en) | 1997-11-12 | 1997-11-12 | Three electrodes type rainfall detecting system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9349899A JPH11142532A (en) | 1997-11-12 | 1997-11-12 | Three electrodes type rainfall detecting system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH11142532A true JPH11142532A (en) | 1999-05-28 |
Family
ID=18406867
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP9349899A Pending JPH11142532A (en) | 1997-11-12 | 1997-11-12 | Three electrodes type rainfall detecting system |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH11142532A (en) |
-
1997
- 1997-11-12 JP JP9349899A patent/JPH11142532A/en active Pending
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