JPH01270601A - Freezing depth sensor - Google Patents
Freezing depth sensorInfo
- Publication number
- JPH01270601A JPH01270601A JP9997888A JP9997888A JPH01270601A JP H01270601 A JPH01270601 A JP H01270601A JP 9997888 A JP9997888 A JP 9997888A JP 9997888 A JP9997888 A JP 9997888A JP H01270601 A JPH01270601 A JP H01270601A
- Authority
- JP
- Japan
- Prior art keywords
- electrodes
- pipe
- soil
- filler
- measured
- 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
- 230000008014 freezing Effects 0.000 title claims abstract description 21
- 238000007710 freezing Methods 0.000 title claims abstract description 21
- 230000000704 physical effect Effects 0.000 claims abstract description 4
- 239000002689 soil Substances 0.000 abstract description 14
- 239000000945 filler Substances 0.000 abstract description 5
- 239000004020 conductor Substances 0.000 abstract description 3
- 239000004576 sand Substances 0.000 abstract description 2
- 229920003002 synthetic resin Polymers 0.000 abstract description 2
- 239000000057 synthetic resin Substances 0.000 abstract description 2
- 230000001360 synchronised effect Effects 0.000 abstract 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 5
- 230000007423 decrease Effects 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 238000005259 measurement Methods 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 238000007796 conventional method Methods 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 238000010276 construction Methods 0.000 description 1
- 239000003792 electrolyte Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
Landscapes
- Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)
- Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)
Abstract
Description
【発明の詳細な説明】 〔産業上の利用分野〕 本発明は凍結を検出するための深度センサに関する。[Detailed description of the invention] [Industrial application field] The present invention relates to a depth sensor for detecting freezing.
一般に、寒冷地においては、冬期に土壌が凍結すること
が知られている。It is generally known that in cold regions, soil freezes during the winter.
しかし土壌の凍結は、農林はもとより土木建築の分野に
も多大な影響を与えるため、その実状を把握することは
産業面から強い要請がある。However, as soil freezing has a significant impact not only on agriculture and forestry but also on civil engineering and construction fields, there is a strong demand from the industrial side to understand the actual situation.
そこで従来は、この種のデータを採取する場合に地面を
実際に掘削して測定するか、或は地面にポーリングをし
てサンプルを採取した後その深度を測定する手法が採ら
れている。Conventionally, when collecting this type of data, methods have been adopted in which the ground is actually excavated and measured, or the ground is polled, a sample is collected, and the depth is then measured.
しかし、前記した従来の方法では、同一地点における凍
結深度を継続的に測定することは不可能であるため、デ
ータの信頼性に欠けるという問題がある。即ち、掘削ま
たはポーリングした部分は外気にさらされることとなる
ため既に周囲の自然情況とは相異し、別の場所で新たな
サンプルを採取する必要があるからである。However, in the conventional method described above, it is impossible to continuously measure the freezing depth at the same point, so there is a problem that the data lacks reliability. That is, since the excavated or polled area is exposed to the outside air, it is already different from the surrounding natural situation, and it is necessary to collect a new sample from a different location.
さらに、従来の方法では測定の都度、人為的な労力が必
要となるため、測定できる地域に大幅な制約を受けると
いう欠点がある。Furthermore, conventional methods require manual labor each time a measurement is performed, which has the disadvantage of severely restricting the area that can be measured.
本発明は前記事項に鑑みてなされたもので、設置が容易
であるとともに、長期間継続して同一地点の凍結深度を
無人で計測し得るようにした凍結深度センサとすること
を技術的課題とする。The present invention has been made in view of the above-mentioned matters, and the technical problem is to provide a freezing depth sensor that is easy to install and that can continuously measure the freezing depth at the same point unattended for a long period of time. do.
本発明は前記技術的課題を解決するために、以下のよう
な構成とした。In order to solve the above technical problem, the present invention has the following configuration.
即ち、管１内に、複数組みの電極２を管１の長手方向に
所定間隔を以て配列する。That is, a plurality of sets of electrodes 2 are arranged within the tube 1 at predetermined intervals in the longitudinal direction of the tube 1.
そして、この管１内に、凍結深度が測定される被測定物
と同様の物性を有する充填体３を充填する。Then, this tube 1 is filled with a filling body 3 having the same physical properties as the object to be measured whose freezing depth is to be measured.
前記複数の電極２は並列接続し、並列合成抵抗として出
力することができ、また、個々に出力して夫々の抵抗を
個別に計測することも可能である。The plurality of electrodes 2 can be connected in parallel and output as a parallel combined resistance, or can be output individually and the resistance of each can be measured individually.
前記管Ｉの材質は、凍結深度が測定される被測定物、例
えば、土壌の比熱及び熱伝導率と同様の特性に設定する
ことが望ましい。また、充填体３の物性とは熱的及び電
気的なものを含む。The material of the tube I is desirably set to have similar characteristics to the specific heat and thermal conductivity of the object to be measured, such as soil, for which the freezing depth is to be measured. Further, the physical properties of the filling body 3 include thermal and electrical properties.
本出願人は、物質の凍結状態にお１」る電気抵抗の変化
について以下の実験を行った。The applicant conducted the following experiments regarding the change in electrical resistance of a substance in a frozen state.
即ち、２本の導体を所定の間隔離して設置してなる電極
２を土壌中に埋設し、この土壌を凍結させてその電気抵
抗の変化を測定したところ、含水率が１００％、即ち、
非凍結状態にあっては２゜ＫΩとなり、この抵抗値は凍
結がある程度まで進行して含水率が３０％となるまで維
持された。そして、含水率が３０％を越えた時点で抵抗
値が上昇し、含水率か０％、即ち、完全凍結状態で数十
ＭΩないし無限大どなった。That is, when the electrode 2, which is made up of two conductors separated for a predetermined period of time, is buried in the soil, and the soil is frozen and the change in electrical resistance is measured, the water content is 100%, that is,
In the non-frozen state, the resistance value was 2°KΩ, and this resistance value was maintained until freezing progressed to a certain extent and the water content reached 30%. When the water content exceeds 30%, the resistance value increases, ranging from several tens of MΩ to infinity when the water content is 0%, that is, in a completely frozen state.
この実験結果は、測定する土壌の含水率、その他電界質
等の含有成分によって異なるものの、略一定の値を示し
た。Although the results of this experiment varied depending on the moisture content of the soil being measured and other components such as electrolytes, they showed approximately constant values.
本発明は以上の実験結果を応用したしのであり、管１周
囲の温度低下に伴って充填体３が凍結することによる電
極２の抵抗値の変化で凍結深度情報を得るものである。The present invention is an application of the above experimental results, and information on the freezing depth is obtained from the change in the resistance value of the electrode 2 due to the freezing of the filling body 3 as the temperature around the tube 1 decreases.
本発明の実施例を図面に基づいて説明する。 Embodiments of the present invention will be described based on the drawings.
管１は、土壌の比熱及び熱伝導率と同様の特性を有する
耐寒性合成樹脂により形成されている。The pipe 1 is made of a cold-resistant synthetic resin having properties similar to the specific heat and thermal conductivity of soil.
この管１内には２本の導体を所定の間隔離して設置して
なる電極２が管１の長手方向に沿って複数個配列されて
おり、これら電極２は夫々並列に接続されており、その
出力端ＯＵ Ｔは外部に導出されている。そして、管１
内に充填体３として、計測すべき土壌と同様の土砂を充
填して前記各電極２を埋入しである。Inside this tube 1, a plurality of electrodes 2, which are two conductors separated by a predetermined interval, are arranged along the longitudinal direction of the tube 1, and these electrodes 2 are connected in parallel. Its output terminal OUT is led out. And tube 1
Each of the electrodes 2 is embedded inside the chamber as a filler 3 with earth and sand similar to the soil to be measured.
使用に際しては、前記構成になるセンサＳを地中に立設
し、その出力端ＯＵＴを抵抗値自動記録装置（図示せず
）に接続する。前記したように凍結深度が深まるにつれ
て、充填体３が外部の土壌の凍結に同期して順次凍結す
る。このため、地表側の電極から順次抵抗が大きくなり
、出力端ｏ Ｕ ’Ｉ’の抵抗値は除徐に大きくなる。In use, the sensor S having the above configuration is installed underground, and its output terminal OUT is connected to an automatic resistance value recording device (not shown). As described above, as the freezing depth increases, the filling bodies 3 are sequentially frozen in synchronization with the freezing of the external soil. For this reason, the resistance increases sequentially from the electrode on the ground side, and the resistance value of the output terminal oU'I' gradually increases.
また、周囲温度の上昇によって氷解した場合には出力端
ＯＵＴの抵抗値は除徐に小ざくなる。Further, when the ice melts due to a rise in ambient temperature, the resistance value of the output terminal OUT gradually decreases.
このように抵抗値の変化によって土壌の凍結深度を計測
することができるため、僅かな電力で計測することがで
きる。したがって抵抗値自動記録装置もバッテリー駆動
の小形のものでよく、長期間の計測が可能となる。In this way, the freezing depth of the soil can be measured based on the change in resistance value, so it can be measured with a small amount of electric power. Therefore, the resistance value automatic recording device can also be a small battery-powered device, and long-term measurement is possible.
なお、前記したように電極２を夫々並列に接続すると、
出力系、計測系共に単純化できるという利点があるが、
個々の電極２の抵抗値を夫々個別に計測することも可能
である。また、被測定物は土壌に限定されるものではな
く、含水性の物質であればその種類を問わないのは勿論
である。Note that if the electrodes 2 are connected in parallel as described above,
It has the advantage of simplifying both the output system and measurement system, but
It is also possible to measure the resistance value of each electrode 2 individually. Furthermore, the object to be measured is not limited to soil, and of course, any type of substance may be used as long as it is a water-containing substance.
本発明によれば、管１内に、複数組みの電極２を管ｌの
長手方向に所定間隔を以て配列するとともに、この管Ｉ
内に、凍結深度が測定される被測定体と同様の熱的物性
を有する充填体３を充填したので、管Ｉ周囲の温度低下
に伴って充填体３が順次凍結し電極２の抵抗値が変化す
る。According to the present invention, a plurality of sets of electrodes 2 are arranged in the tube 1 at predetermined intervals in the longitudinal direction of the tube 1, and the tube I
Since the inside of the tube is filled with a filling body 3 having thermal properties similar to those of the object to be measured whose freezing depth is to be measured, the filling body 3 gradually freezes as the temperature around the tube I decreases, and the resistance value of the electrode 2 decreases. Change.
このため、電極２の抵抗値を計測することによって同一
地点の凍結深度を計測することができ、長期に亘ってデ
ータを自動採取することが可能である。しかも管１を地
面等に縦に埋入するだけで設置することができるため設
置が容易である等の優れた効果がある。Therefore, by measuring the resistance value of the electrode 2, the freezing depth at the same point can be measured, and data can be automatically collected over a long period of time. Moreover, since the pipe 1 can be installed simply by vertically burying it in the ground, etc., there are excellent effects such as ease of installation.
図面は本発明の実施例を示す縦断面図である。
■・・−管、 ２・・・電極、
３・・充填体。The drawings are longitudinal sectional views showing embodiments of the present invention. ■...-tube, 2...electrode,
3. Filling body.
Claims (1)
所定間隔を以て配列されているとともに、この管１内に
、凍結深度が測定される被測定物と同様の物性を有する
充填体３が充填されていることを特徴とする凍結深度セ
ンサ。(1) A plurality of sets of electrodes 2 are arranged in the tube 1 at predetermined intervals in the longitudinal direction of the tube 1, and the tube 1 has the same physical properties as the object to be measured whose freezing depth is to be measured. A freezing depth sensor characterized by being filled with a filling body 3.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9997888A JPH01270601A (en) | 1988-04-22 | 1988-04-22 | Freezing depth sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9997888A JPH01270601A (en) | 1988-04-22 | 1988-04-22 | Freezing depth sensor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH01270601A true JPH01270601A (en) | 1989-10-27 |
Family
ID=14261758
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP9997888A Pending JPH01270601A (en) | 1988-04-22 | 1988-04-22 | Freezing depth sensor |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH01270601A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107894213A (en) * | 2018-01-08 | 2018-04-10 | 河北科技大学 | Optical fiber frost penetration sensor |
| CN107976150A (en) * | 2017-12-06 | 2018-05-01 | 淮阴师范学院 | For adaptive the frost penetration measuring device and measuring system being detected to frost penetration |
| CN117387532A (en) * | 2023-12-12 | 2024-01-12 | 哈尔滨师范大学 | Soil freezing depth measuring device and measuring method |
-
1988
- 1988-04-22 JP JP9997888A patent/JPH01270601A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107976150A (en) * | 2017-12-06 | 2018-05-01 | 淮阴师范学院 | For adaptive the frost penetration measuring device and measuring system being detected to frost penetration |
| CN107894213A (en) * | 2018-01-08 | 2018-04-10 | 河北科技大学 | Optical fiber frost penetration sensor |
| CN117387532A (en) * | 2023-12-12 | 2024-01-12 | 哈尔滨师范大学 | Soil freezing depth measuring device and measuring method |
| CN117387532B (en) * | 2023-12-12 | 2024-02-23 | 哈尔滨师范大学 | Soil freezing depth measuring device and measuring method |
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