JPH02259428A - Water gauge - Google Patents
Water gaugeInfo
- Publication number
- JPH02259428A JPH02259428A JP7803889A JP7803889A JPH02259428A JP H02259428 A JPH02259428 A JP H02259428A JP 7803889 A JP7803889 A JP 7803889A JP 7803889 A JP7803889 A JP 7803889A JP H02259428 A JPH02259428 A JP H02259428A
- Authority
- JP
- Japan
- Prior art keywords
- pipe
- water level
- air
- air bubbles
- water
- 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
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 38
- 239000004065 semiconductor Substances 0.000 claims abstract description 4
- 238000006243 chemical reaction Methods 0.000 claims description 15
- 238000001514 detection method Methods 0.000 claims description 2
- 238000007599 discharging Methods 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 6
- 230000003321 amplification Effects 0.000 description 1
- 230000004069 differentiation Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
Landscapes
- Measurement Of Levels Of Liquids Or Fluent Solid Materials (AREA)
Abstract
Description
【発明の詳細な説明】
（産業上の利用分野）
本発明は、水位をデジタルデータにて検出する水位計に
関するものである。DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a water level meter that detects water level using digital data.
（従来の技術）
従来より、井戸や水源地等の水位を遠隔地にて測定する
方法は、第４図に示すように、フロート１１、可変抵抗
器１２．アナログデジタル変換回路１０（以後ＡＤ変換
回路１０と略す）を用いた水位計が知られている。(Prior Art) Conventionally, as shown in FIG. 4, a method for measuring the water level of a well or water source at a remote location uses a float 11, a variable resistor 12, etc. A water level gauge using an analog-to-digital conversion circuit 10 (hereinafter abbreviated as AD conversion circuit 10) is known.
第４図において、例えば水位４が変化すると、シリンダ
１５内のフロート１１が水位４に追従して上下に変化す
る。ロッド１６と自由に回転できる継手１７により可変
抵抗器１２のシャフト１２ａを回転させる。この回転に
比例したアナログ信号１３は、ＡＤ変換回路１０へ入力
されてデジタル信号９を出力する。In FIG. 4, for example, when the water level 4 changes, the float 11 in the cylinder 15 follows the water level 4 and changes up and down. The shaft 12a of the variable resistor 12 is rotated by the rod 16 and the freely rotatable joint 17. An analog signal 13 proportional to this rotation is input to an AD conversion circuit 10 and outputs a digital signal 9.
第５図はＡＤ変換回路１０のブロック図である。FIG. 5 is a block diagram of the AD conversion circuit 10.
第５図において、例えば基準電源Ｂより可変抵抗器１２
へ一定電圧を印加する。水位４に比例したアナログ信号
１３が可変抵抗器１２より出力され、この信号がＡＤ変
換器１４へ入力され、デジタル信号９を出力する。In FIG. 5, for example, the variable resistor 12 is connected to the reference power source B.
Apply a constant voltage to. An analog signal 13 proportional to the water level 4 is output from the variable resistor 12, this signal is input to the AD converter 14, and a digital signal 9 is output.
（発明が解決しようとする課題）
前記従来の水位計では、可変抵抗器１２のシャフト１２
ａを回転させるために、フロート１１を小型にすること
ができなかった。又、デジタル変換するのに高価なＡＤ
変換１１１１４が必要であった。(Problem to be Solved by the Invention) In the conventional water level gauge, the shaft 12 of the variable resistor 12
In order to rotate the float 11, it was not possible to make the float 11 smaller. Also, AD is expensive for digital conversion.
Conversion 11114 was required.
又、可変抵抗器１２のシャフト１２ａは水位４と一緒に
回転しているので、寿命も短く信頼性も高くなかった。Further, since the shaft 12a of the variable resistor 12 rotates together with the water level 4, its lifespan is short and reliability is not high.
（課題を解決するための手段）
本発明は前記課題を解決するためになされたもので、本
発明の一実施例に対応する第１図を用いて説明すると、
本発明による水位計は、定流量のエアを放出する定流量
ポンプ２を設け、このエアをパイプ１を通して、水中に
気泡７を放出し、気泡７の放出をパイプ１の途中に設け
た半導体圧量センサ８にて検出し、気泡放出間隔検出パ
ルスをアナログデジタル変換回路３（以後ＡＤ変換回路
３と略す）により水位４のデジタル信号９として出力す
るようにしたものである。(Means for Solving the Problems) The present invention has been made to solve the above problems, and will be explained using FIG. 1 corresponding to one embodiment of the present invention.
The water level gauge according to the present invention is equipped with a constant flow pump 2 that discharges a constant flow of air, and the air is passed through a pipe 1 to discharge air bubbles 7 into the water. The air bubble release interval detection pulse is detected by the quantity sensor 8 and outputted as a digital signal 9 of the water level 4 by an analog-to-digital conversion circuit 3 (hereinafter abbreviated as AD conversion circuit 3).
（作用）
本発明によれば、パイプ１に一定流量のエアを送り込む
ことにより水位４が一定の場合、一定間隔で気泡７を水
中に放出する。この間隔は水位４が上がるほど長くなり
、水位が下がるほど間隔は短くなる。(Function) According to the present invention, when the water level 4 is constant, air bubbles 7 are released into the water at regular intervals by sending a constant flow rate of air into the pipe 1. This interval becomes longer as the water level 4 rises, and becomes shorter as the water level falls.
この間隔をバイブ１内の気泡７放出時のエア圧力の変動
分として検出し、パルスを発生させ、これを水位のデジ
タル信号９として出力できる。This interval is detected as a variation in the air pressure when bubbles 7 are released in the vibrator 1, a pulse is generated, and this can be output as a digital signal 9 of the water level.
（実施例）
第１図は、本発明による水位計の一実施例を示す構成図
であって、従来例を示す第４図と同一部分は同一符号を
付してその説明を省略する。即ち、定流量エアポンプ２
より一定流量のエアを、パイプ１へ排出すると、水中に
あるパイプ１の先端のノズル６より、一定間隔で気泡７
が水中に放出される。パイプ１の途中に絞り５を設け、
その近くに半導体圧力センサ８（以後圧力センサ８と略
す）を設け、この圧力センサ８により気泡７放出時に発
生する圧力の変動を検出する。この時、圧力センサ８へ
圧力の変動が伝えやすいように定流量エアポンプ２側に
絞り５を設けである。又、パイプ１の先端をノズル６の
構造とすることで気泡７の放出が安定するようにしであ
る。又、圧力センサ８で検出された信号は、ＡＤ変換回
路３へ入力され、デジタル信号９を出力する。(Embodiment) FIG. 1 is a configuration diagram showing an embodiment of a water level meter according to the present invention, and the same parts as those in FIG. 4 showing a conventional example are given the same reference numerals and the explanation thereof will be omitted. That is, constant flow air pump 2
When a more constant flow rate of air is discharged into the pipe 1, air bubbles 7 are emitted at regular intervals from the nozzle 6 at the tip of the pipe 1 underwater.
is released into the water. A throttle 5 is provided in the middle of the pipe 1,
A semiconductor pressure sensor 8 (hereinafter abbreviated as pressure sensor 8) is provided nearby, and this pressure sensor 8 detects the fluctuation in pressure that occurs when the bubble 7 is released. At this time, a throttle 5 is provided on the constant flow air pump 2 side so that pressure fluctuations can be easily transmitted to the pressure sensor 8. Furthermore, by forming the tip of the pipe 1 into a nozzle 6 structure, the release of air bubbles 7 is stabilized. Further, the signal detected by the pressure sensor 8 is input to the AD conversion circuit 3, which outputs a digital signal 9.
第２図は圧力センサ８の出力をデジタル信号９に変換す
るためのＡＤ変換回路３の一例を示し、圧力センサ８は
、定電流駆動回路１８により定電流駆動され、差動増幅
回路１９で圧力信号２０を出力し、直流遮断回路２１を
通し、増幅回路２２で動的成分のみを増幅し、微分回路
２３を通し。FIG. 2 shows an example of the AD conversion circuit 3 for converting the output of the pressure sensor 8 into a digital signal 9. The pressure sensor 8 is driven with a constant current by a constant current drive circuit 18, and the pressure A signal 20 is output, passed through a DC cutoff circuit 21, amplified only the dynamic component by an amplifier circuit 22, and passed through a differentiation circuit 23.
微分信号２５と、基準電圧２６とを比較回路２４で比較
しデジタル信号９を出力する。A comparison circuit 24 compares the differential signal 25 and a reference voltage 26 and outputs a digital signal 9.
第３図は、第２図を説明するためのタイミングチャート
で水位４に比例して圧力信号２０が変化する、この圧力
信号２０から微分信号２５が出力され、微分信号２５が
基準電圧２６を下回ると、デジタル信号９がＬ”レベル
になる。水位４が低いときは、デジタル信号９のパルス
間隔がＴ１に、水位４が高くなると、デジタル信号９の
パルス間隔がＴ２となり、水位４と相関関係のあるデジ
タル信号９を出力する。FIG. 3 is a timing chart for explaining FIG. 2. The pressure signal 20 changes in proportion to the water level 4. A differential signal 25 is output from this pressure signal 20, and the differential signal 25 falls below the reference voltage 26. When the water level 4 is low, the pulse interval of the digital signal 9 is T1, and when the water level 4 is high, the pulse interval of the digital signal 9 is T2, which has a correlation with the water level 4. A digital signal 9 is output.
（発明の効果）
以上説明したように本発明によれば、水位計にフロート
を使用する必要がなく、さらに検出器に可変抵抗器等を
使用しないので、小型でしかも長寿命で高信頼性にでき
る。(Effects of the Invention) As explained above, according to the present invention, there is no need to use a float in the water level gauge, and there is no need to use a variable resistor or the like in the detector. can.
又、高価なアナログデジタル変換器を用いることなく、
安価なセンサーと回路で、デジタル信号を出力すること
ができ、水位計の小型化、並びに低価格化を図れる利点
がある。Also, without using expensive analog-to-digital converters,
It is possible to output digital signals using inexpensive sensors and circuits, which has the advantage of making water level gauges smaller and cheaper.
第１図は本発明による水位計の一実施例を示す構成図、
第２図は同アナログデジタル変換回路の回路図、第３図
は同実施例の動作を説明するためのタイミングチャート
、第４図は水位計の従来例を示す構成図、第５図は従来
のアナログデジタル変換回路の一例を示す回路図である
。
１・・・・・・パイプ ２・・・・・・定流量
ポンプ２ａ・・・・・・シャフト
３．１ｏ・・・・・・アナログデジタル変換回路４・・
・・・・水位 ５・・・・・・絞り６・・・
・・・ノズル ７・・・・・・気泡８・・・・
・・半導体圧力センサ
９・・・・・・デジタル信号
１１・・・・・・フロート １２・・・・・・可変
抵抗器１３・・・・・・アナログ信号
１４・・・・・・ＡＤ変換器
１５・・・・・・シリンダー
１６・・・・・・ロッド
１８・・・・・・定電流駆動回路
１９・・・・・・差動増幅回路
２０・・・・・・圧力信号
２２・・・・・・増幅回路
２４・・・・・・比較回路
２６・・・・・・基準電圧
１７・・・・・・継手
２１・・・・・・直流遮断回路
２３・・・・・・微分回路
２５・・・・・・微分信号
Ｂ・・・・・・基準電源FIG. 1 is a configuration diagram showing an embodiment of a water level meter according to the present invention;
Fig. 2 is a circuit diagram of the same analog-to-digital conversion circuit, Fig. 3 is a timing chart for explaining the operation of the same embodiment, Fig. 4 is a block diagram showing a conventional example of a water level gauge, and Fig. 5 is a conventional example of a water level gauge. FIG. 2 is a circuit diagram showing an example of an analog-to-digital conversion circuit. 1...Pipe 2...Constant flow pump 2a...Shaft 3.1o...Analog-digital conversion circuit 4...
...Water level 5...Aperture 6...
... Nozzle 7 ... Bubbles 8 ...
... Semiconductor pressure sensor 9 ... Digital signal 11 ... Float 12 ... Variable resistor 13 ... Analog signal 14 ... AD conversion Device 15... Cylinder 16... Rod 18... Constant current drive circuit 19... Differential amplifier circuit 20... Pressure signal 22. ...Amplification circuit 24 ...Comparison circuit 26 ...Reference voltage 17 ...Joint 21 ...DC cutoff circuit 23 ... Differential circuit 25...Differential signal B...Reference power supply
Claims (1)
をパイプに通して水中に気泡を放出し、前記気泡の放出
を前記パイプの途中に設けた半導体圧力センサで検出し
、前記気泡放出間隔検出パルスをＡＤ変換回路により水
位のデジタル信号として出力するようにしたことを特徴
とする水位計。A constant flow pump that releases a constant flow of air is provided, the air is passed through a pipe to release bubbles into the water, the release of the bubbles is detected by a semiconductor pressure sensor installed in the middle of the pipe, and the air bubble release interval is detected. A water level gauge characterized in that a detection pulse is output as a digital water level signal using an AD conversion circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7803889A JPH02259428A (en) | 1989-03-31 | 1989-03-31 | Water gauge |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7803889A JPH02259428A (en) | 1989-03-31 | 1989-03-31 | Water gauge |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH02259428A true JPH02259428A (en) | 1990-10-22 |
Family
ID=13650657
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7803889A Pending JPH02259428A (en) | 1989-03-31 | 1989-03-31 | Water gauge |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH02259428A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5261276A (en) * | 1992-05-04 | 1993-11-16 | Henry Gifford | Fuel oil monitor system and method |
| JPH06272912A (en) * | 1993-03-23 | 1994-09-27 | Nippon Spindle Mfg Co Ltd | Method of controlling ice heat accumulating device |
| US6467522B1 (en) * | 1999-07-27 | 2002-10-22 | Castle, Inc. | Edge banding apparatus and method |
| US6510736B1 (en) | 2000-10-24 | 2003-01-28 | William J. Van Ee | Liquid depth sensing system |
-
1989
- 1989-03-31 JP JP7803889A patent/JPH02259428A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5261276A (en) * | 1992-05-04 | 1993-11-16 | Henry Gifford | Fuel oil monitor system and method |
| JPH06272912A (en) * | 1993-03-23 | 1994-09-27 | Nippon Spindle Mfg Co Ltd | Method of controlling ice heat accumulating device |
| US6467522B1 (en) * | 1999-07-27 | 2002-10-22 | Castle, Inc. | Edge banding apparatus and method |
| US6510736B1 (en) | 2000-10-24 | 2003-01-28 | William J. Van Ee | Liquid depth sensing system |
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