JP2552677B2 - Hydroponics control device - Google Patents
Hydroponics control deviceInfo
- Publication number
- JP2552677B2 JP2552677B2 JP62212216A JP21221687A JP2552677B2 JP 2552677 B2 JP2552677 B2 JP 2552677B2 JP 62212216 A JP62212216 A JP 62212216A JP 21221687 A JP21221687 A JP 21221687A JP 2552677 B2 JP2552677 B2 JP 2552677B2
- Authority
- JP
- Japan
- Prior art keywords
- medium
- nutrient solution
- amount
- water content
- 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.)
- Expired - Fee Related
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2291/00—Indexing codes associated with group G01N29/00
- G01N2291/02—Indexing codes associated with the analysed material
- G01N2291/028—Material parameters
- G01N2291/02809—Concentration of a compound, e.g. measured by a surface mass change
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2291/00—Indexing codes associated with group G01N29/00
- G01N2291/02—Indexing codes associated with the analysed material
- G01N2291/028—Material parameters
- G01N2291/02845—Humidity, wetness
Landscapes
- Hydroponics (AREA)
- Measuring Volume Flow (AREA)
- Investigating Or Analyzing Materials By The Use Of Ultrasonic Waves (AREA)
Description
【発明の詳細な説明】 〔産業上の利用分野〕 この発明は、養液栽培において、培地内の水分量の最
適制御を行う養液栽培制御装置に関する。TECHNICAL FIELD The present invention relates to a hydroponic control apparatus that optimally controls the amount of water in a medium in hydroponics.
人工培地に植物を植え付け、栽培上必要な水分と肥料
とを混合した養液を供給して植物の栽培を行う養液栽培
が実用化されているが、このような養液栽培では、水分
量の不足が枯死などの原因になるので、植物の育成上、
水分量を最適値に制御することが必要である。Hydroponics in which a plant is planted in an artificial medium and a nutrient solution in which water and fertilizer necessary for cultivation are mixed to cultivate the plant has been put into practical use. Insufficient water causes death and so on.
It is necessary to control the water content to the optimum value.
また、培地内の水分量は、気象状況や、植物の育成状
態などによって、その減少傾向が異なり、常に監視する
ことが必要であるが、それを常に定量的に測定すること
は、非常に手数を要し、困難であるとともに、養液栽培
のコストを上げ、また、管理を怠ると枯死や栽培効率の
低下の原因になる。In addition, the amount of water in the medium has a decreasing tendency depending on the weather conditions and the growing condition of plants, and it is necessary to constantly monitor it, but it is very troublesome to constantly measure it. It is difficult and time-consuming and raises the cost of hydroponics, and if it is not managed, it causes death and a decrease in cultivation efficiency.
従来、培地内の水分量の測定には、培地内に差し込ん
だ電極間の電気伝導度を測定する方法や、ヒータを利用
して比熱を測定する方法などがある。前者では、測定値
が培地の密度、養液の肥料濃度、温度に影響されるた
め、水分量を正確に知ることができない。また、後者で
は、測定値が培地の密度や温度に影響を受け、応答も遅
いなどの欠点を持っている。Conventionally, for measuring the amount of water in the medium, there are a method of measuring electric conductivity between electrodes inserted in the medium, a method of measuring specific heat using a heater, and the like. In the former case, the measured value is influenced by the density of the medium, the fertilizer concentration of the nutrient solution, and the temperature, so that the water content cannot be accurately known. In the latter case, the measured value is affected by the density and temperature of the medium, and the response is slow.
そこで、この発明は、培地内水分量の検出に基づいて
適量の養液供給を行う栽培制御を実現した溶液栽培制御
装置を提供することを目的とする。Then, this invention aims at providing the solution cultivation control apparatus which implement | achieved the cultivation control which supplies an appropriate amount of nutrient solution based on the detection of the water content in a culture medium.
この発明の養液栽培制御装置は、第１図に例示するよ
うに、栽培すべき植物４を植え付けた培地６と、この培
地に養液を滴下して供給する養液供給手段（潅水装置1
0）と、前記培地に音波を加え、前記培地を通過する音
波を受波手段（マイクロフォン21）受信することによ
り、前記培地内の音波の伝播速度を求め、この伝播速度
を以て前記培地内の水分量を検出する水分量検出手段
（水分量検出装置２）と、この水分量検出手段で検出さ
れた前記水分量と前記培地に対する水分量の設定値とを
比較して不足水分量を求め、この不足水分量の養液を前
記養液供給手段により前記培地に対して供給させる養液
制御手段（潅水制御部８）とを備えて、前記培地の水分
量を設定値に制御して前記植物の栽培制御を行うことを
特徴とする。As shown in FIG. 1, the nutrient solution control device of the present invention includes a culture medium 6 in which a plant 4 to be cultivated and a nutrient solution supply means for supplying the culture medium by dropping the nutrient solution (irrigation device 1
0), the sound wave is applied to the medium, and the sound wave passing through the medium is received by the wave receiving means (microphone 21) to obtain the propagation speed of the sound wave in the medium, and the propagation speed is used to determine the water content in the medium. The water content detecting means (water content detecting device 2) for detecting the water content is compared with the water content detected by the water content detecting means and the set value of the water content for the medium to obtain the insufficient water content. And a nutrient solution control unit (irrigation control unit 8) for supplying a nutrient solution having a deficient water content to the medium by the nutrient solution supply unit, controlling the water content of the medium to a set value, and It is characterized by performing cultivation control.
水中の音の伝播速度は、空気中の約4.5倍程度である
が、培地６を成す材質に水分を含ませた場合、その水分
量と音波Ｓの伝播速度とが比例関係を持っており、水分
量が多い程、音波Ｓの伝播速度が速くなる関係があるこ
とが実験によって確認された。The propagation speed of sound in water is about 4.5 times that in air, but when the material forming the medium 6 contains water, the amount of water and the propagation speed of the sound wave S have a proportional relationship. It was confirmed by experiments that there is a relation that the propagation speed of the sound wave S increases as the amount of water increases.
そこで、この発明は、培地６内を伝播する音波Ｓの伝
播速度から培地６内の水分量を検出し、その水分量に応
じて養液を培地６に供給することによって、培地６内の
水分量を最適値に制御するのである。Therefore, according to the present invention, the water content in the medium 6 is detected by detecting the water content in the medium 6 from the propagation speed of the sound waves S propagating in the medium 6 and supplying the nutrient solution to the medium 6 according to the water content. The amount is controlled to the optimum value.
第１図は、この発明の養液栽培制御装置の実施例を示
す。FIG. 1 shows an embodiment of the hydroponics control device of the present invention.
水分量検出装置２は水分量検出手段として設置され、
植物４を植え付けた培地６内に音波Ｓを加える音源とし
てスピーカ20と、培地６を通過した音波Ｓを受ける受波
手段としてマイクロフォン21とを備え、音波Ｓの伝播速
度から培地６内の水分量を検出する。The water content detection device 2 is installed as water content detection means,
The medium 6 in which the plant 4 is planted is provided with a speaker 20 as a sound source for adding the sound wave S and a microphone 21 as a wave receiving means for receiving the sound wave S that has passed through the medium 6, and the amount of water in the medium 6 from the propagation speed of the sound wave S. To detect.
潅水制御部８は、養液制御手段として設置され、水分
量検出装置２から現在の養液量を表す養液量検出信号Vw
を取り込んで、最適な潅水量として供給すべき水分量に
応じた養液量Woを算出する。この潅水制御部８は、たと
えば、マイクロコンピュータを以て構成して、植物４の
種類、植物４の育成日数、気象条件などによって最適な
養液量Wnを算出することにより、取り込まれた現在の養
液量Wxとの比較を行って、その養液量の不足分ΔＷを算
出し、その不足分を補う養液量Woを表す潅水制御信号V
woを出力するのである。The irrigation control unit 8 is installed as a nutrient solution control means, and the nutrient solution amount detection signal V w representing the current nutrient solution amount from the water content detection device 2 is supplied.
And the nutrient solution amount W o is calculated according to the amount of water to be supplied as the optimum irrigation amount. The irrigation control unit 8 is configured by a microcomputer, for example, and calculates the optimum nutrient solution amount W n according to the type of the plant 4, the number of growing days of the plant 4, the weather conditions, etc. The irrigation control signal V that expresses the nutrient solution amount W o to make up for the deficiency amount ΔW by comparing with the liquid amount W x
It outputs wo .
そして、潅水装置10は、養液供給手段であって、植物
４の養液栽培に必要な栽培養液や水等の養液を作成して
保持するとともに、潅水制御部８からの潅水制御信号V
woに基づいた潅水量を計量し、その潅水量で定まる養液
を培地６に対して供給する。Then, the irrigation device 10 is a nutrient solution supply means, creates and holds a nutrient solution such as a culture nutrient solution and water necessary for the nutrient culture of the plant 4, and a irrigation control signal from the irrigation controller 8. V
The irrigation amount based on wo is measured, and the nutrient solution determined by the irrigation amount is supplied to the medium 6.
したがって、このような潅水制御によれば、培地内の
水分量を正確に検出し、培地内の水分量が設定値より減
じたとき、その減じられた量を補うための養液量Woを算
出し、培地６に供給することができる。したがって、培
地６に対して植物４の種類、育成状況、気象条件に応じ
て最適な養液供給を連続的に行うことができるのであ
る。この場合、育成期間を通じてのマクロ的な養液の制
御は勿論のこと、日々の刻々と変化する潅水量について
の制御をも行うことができる。Therefore, according to such irrigation control, the amount of water in the medium is accurately detected, and when the amount of water in the medium is lower than the set value, the nutrient solution amount W o for compensating for the reduced amount is set. It can be calculated and supplied to the medium 6. Therefore, the optimum nutrient solution can be continuously supplied to the medium 6 according to the type of the plant 4, the growing condition, and the weather conditions. In this case, not only macroscopic control of the nutrient solution throughout the growing period but also control of the amount of irrigation that changes from day to day can be performed.
第２図は、第１図に示した養液栽培制御装置における
水分量検出装置２の具体的な構成例を示す。FIG. 2 shows a specific configuration example of the water content detection device 2 in the hydroponics control device shown in FIG.
植物４が植え付けられた培地６について、水分量の測
定部位として相対向する２辺部分を選定する。その一方
に音源として特定の周波数の音波Ｓを発生させるための
スピーカ20が設置され、他方に培地６内を通過した音波
Ｓを受ける受波手段としてマイクロフォン21が設置され
る。With respect to the medium 6 in which the plant 4 is planted, the two sides facing each other are selected as measurement sites for the water content. A speaker 20 for generating a sound wave S having a specific frequency is installed as a sound source on one side thereof, and a microphone 21 is installed on the other side as a wave receiving means for receiving the sound wave S passing through the inside of the medium 6.
発振器22は、特定周波数の発振信号Vsを発振し、この
発振信号Vsは、増幅部23によって増幅された後、スピー
カ20から発振信号Vsに応じた音波Ｓを発生させ、培地６
内に加える。The oscillator 22 oscillates an oscillating signal V s of a specific frequency, and this oscillating signal V s is amplified by the amplifying unit 23, and then a sound wave S corresponding to the oscillating signal V s is generated from the speaker 20, and the medium 6
Add in
音波Ｓは、矢印で示すように、培地６内を伝播してマ
イクロフォン21によって受波され、電気信号である受波
信号Vrに変換される。この受波信号Vrは、受波部24によ
って増幅および波形整形が行われた後、位相差検出部25
で、増幅部23から制御部26を通して加えられている発振
信号Vsと位相の比較が行われ、両者の位相差φが検出さ
れる。As shown by the arrow, the sound wave S propagates through the medium 6 and is received by the microphone 21 and converted into a received signal V r which is an electric signal. The received signal V r is amplified and waveform-shaped by the receiving unit 24, and then the phase difference detection unit 25
Then, the phase is compared with the oscillation signal V s applied from the amplifier 23 through the controller 26, and the phase difference φ between the two is detected.
この位相差φは、電圧値などで定量的に与えられるか
ら、その位相差φを表す出力信号から水分量を検出する
水分量検出部27によって水分量を表す水分量信号Vwに変
換され、水分量を知ることができる。Since this phase difference φ is quantitatively given by a voltage value or the like, it is converted into a water content signal V w representing the water content by the water content detection unit 27 that detects the water content from the output signal representing the phase difference φ, You can know the water content.
第３図は、この場合の水分（％）に対する位相差φが
比例関係となることを表しており、位相差φから培地６
内の水分量を知ることができる。FIG. 3 shows that the phase difference φ with respect to the water content (%) in this case has a proportional relationship.
You can know the amount of water inside.
この測定において、培地６の密度は、音波Ｓの伝播速
度に影響を及ぼすが、たとえば、水分を含まない培地６
の伝播速度を予め測定しておき、それを補償量として演
算上初期値に設定することでその差分を除けば、その影
響を回避することができる。In this measurement, the density of the medium 6 affects the propagation velocity of the sound waves S, but for example, the medium 6 containing no water is used.
The effect can be avoided by measuring the propagation velocity of the signal in advance and setting it as the compensation amount to the initial value in the calculation and eliminating the difference.
なお、実施例では、潅水量の制御として養液量の制御
について説明したが、この発明は、潅水量の制御として
単なる水の供給量の制御についても利用できるものであ
る。In the embodiment, the control of the nutrient solution amount was described as the control of the irrigation amount, but the present invention can also be used for the simple control of the water supply amount as the control of the irrigation amount.
以上説明したように、この発明によれば、音波を利用
して培地内の水分量を正確に検出し、その検出に基づい
て、植物の育成に最適な養液量に制御することができ、
植物の育成効率を高めることができるとともに、養液の
設定によって植物の栽培制御を行うことができる。As described above, according to the present invention, it is possible to accurately detect the amount of water in the medium by using sound waves, and based on the detection, it is possible to control to the optimum amount of nutrient solution for growing plants,
It is possible to enhance the efficiency of growing plants and control the cultivation of plants by setting the nutrient solution.
【図面の簡単な説明】 第１図はこの発明の養液栽培制御装置の実施例を示す
図、第２図は第１図に示した養液栽培制御装置における
水分量検出装置の具体的な構成例を示す図、第３図は水
分に対する位相差を表す図である。 ２……水分量検出装置（水分量検出手段） ４……植物 ６……培地 ８……潅水制御部（養液制御手段） 10……潅水装置（養液供給手段） 21……マイクロフォン（受波手段）BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a diagram showing an embodiment of a hydroponic culture control device of the present invention, and FIG. 2 is a specific example of a water content detecting device in the hydroponic culture control device shown in FIG. FIG. 3 is a diagram showing a configuration example, and FIG. 3 is a diagram showing a phase difference with respect to water. 2 ... Water content detection device (water content detection means) 4 ... Plant 6 ... Medium 8 ... Irrigation control unit (nutrient solution control means) 10 ... Irrigation device (nutrition solution supply means) 21 ... Microphone (receiver) Wave means)
フロントページの続き (72)発明者 篠原 占三 静岡県富士市西柏原新田201番地 ▲高 ▼木産業株式会社内 (72)発明者 川嶋 軍司 静岡県富士市西柏原新田201番地 ▲高 ▼木産業株式会社内 (56)参考文献 特開 昭61−281964（ＪＰ，Ａ) 特開 昭49−84296（ＪＰ，Ａ) 特開 昭58−66849（ＪＰ，Ａ) 実開 昭62−33261（ＪＰ，Ｕ)Front page continuation (72) Inventor Shizozo Shinohara 201 Nishi-Kashiwabara Shinden, Fuji City, Shizuoka Prefecture ▲ High ▼ Inside wood industry Co., Ltd. Wood Industry Co., Ltd. (56) Reference JP-A-61-281964 (JP, A) JP-A-49-84296 (JP, A) JP-A-58-66849 (JP, A) Actual development 62-33261 ( JP, U)
Claims (1)
手段で受信することにより、前記培地内の音波の伝播速
度を求め、この伝播速度を以て前記培地内の水分量を検
出する水分量検出手段と、 この水分量検出手段で検出された前記水分量と前記培地
に対する水分量の設定値とを比較して不足水分量を求
め、この不足水分量の養液を前記養液供給手段により前
記培地に対して供給させる養液制御手段と、 を備えて、前記培地の水分量を設定値に制御して前記植
物の栽培制御を行うことを特徴とする養液栽培制御装
置。1. A medium in which a plant to be cultivated is planted, a nutrient solution supplying means for dropping a nutrient solution into the medium, a sound wave is applied to the medium, and a sound wave passing through the medium is received by a wave receiving means. By receiving, the propagation velocity of the sound wave in the medium is obtained, and the moisture content detecting means for detecting the moisture content in the medium by this propagation velocity, and the moisture content and the medium detected by the moisture content detecting means. And a nutrient solution control means for supplying a nutrient solution with this moisture content to the medium by the nutrient solution supply means, A hydroponic culture control device for controlling the cultivation of the plant by controlling the water content of the plant to a set value.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62212216A JP2552677B2 (en) | 1987-08-26 | 1987-08-26 | Hydroponics control device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62212216A JP2552677B2 (en) | 1987-08-26 | 1987-08-26 | Hydroponics control device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6455127A JPS6455127A (en) | 1989-03-02 |
| JP2552677B2 true JP2552677B2 (en) | 1996-11-13 |
Family
ID=16618857
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP62212216A Expired - Fee Related JP2552677B2 (en) | 1987-08-26 | 1987-08-26 | Hydroponics control device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2552677B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2564774B2 (en) * | 1995-04-24 | 1996-12-18 | 静岡県 | Water content measuring device in culture medium |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4984296A (en) * | 1972-12-15 | 1974-08-13 | ||
| JPS5866849A (en) * | 1981-10-16 | 1983-04-21 | Hazama Gumi Ltd | Control method for quality of concrete |
| JPS61281964A (en) * | 1985-06-07 | 1986-12-12 | Iseki & Co Ltd | Soil hardness detector of paddy field mobile agricultral machine |
| JPS6233261U (en) * | 1985-08-12 | 1987-02-27 |
-
1987
- 1987-08-26 JP JP62212216A patent/JP2552677B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6455127A (en) | 1989-03-02 |
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| R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
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| LAPS | Cancellation because of no payment of annual fees |