JPH06265497A - Measuring method of water content - Google Patents
Measuring method of water contentInfo
- Publication number
- JPH06265497A JPH06265497A JP5607893A JP5607893A JPH06265497A JP H06265497 A JPH06265497 A JP H06265497A JP 5607893 A JP5607893 A JP 5607893A JP 5607893 A JP5607893 A JP 5607893A JP H06265497 A JPH06265497 A JP H06265497A
- Authority
- JP
- Japan
- Prior art keywords
- water content
- measuring
- resistance
- electrodes
- resistance value
- 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 26
- 238000000034 method Methods 0.000 title claims abstract description 21
- 238000011088 calibration curve Methods 0.000 claims description 6
- 238000005259 measurement Methods 0.000 abstract description 10
- 238000010586 diagram Methods 0.000 description 5
- 238000001514 detection method Methods 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 238000005260 corrosion Methods 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 150000002500 ions Chemical class 0.000 description 2
- 238000000691 measurement method Methods 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- -1 oxygen ions Chemical class 0.000 description 2
- 238000012935 Averaging Methods 0.000 description 1
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 description 1
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 description 1
- 239000000292 calcium oxide Substances 0.000 description 1
- 229910010293 ceramic material Inorganic materials 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- WABPQHHGFIMREM-UHFFFAOYSA-N lead(0) Chemical compound [Pb] WABPQHHGFIMREM-UHFFFAOYSA-N 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 229920002379 silicone rubber Polymers 0.000 description 1
- 239000002023 wood Substances 0.000 description 1
Landscapes
- Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、木材あるいは窯業系材
料等の多孔質材料における含水率の計測方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for measuring water content in porous materials such as wood and ceramic materials.
【０００２】[0002]
【従来の技術】この種の含水率の計測方法として、従
来、先端部が被計測物中において所定量離間して対向す
るよう１対の針状電極を配置し、この１対の針状電極間
に直流電圧を印加してその間の抵抗を測定し、この抵抗
値と既知の含水率及び抵抗値により作成された検量線と
を照合する方法が提案されている。2. Description of the Related Art As a method of measuring the water content of this type, conventionally, a pair of needle-shaped electrodes are arranged so that their tip portions face each other in the object to be measured with a predetermined distance therebetween, and the pair of needle-shaped electrodes are arranged. A method has been proposed in which a direct current voltage is applied between the electrodes to measure the resistance between them, and the resistance value is compared with a calibration curve created based on the known water content and resistance value.
【０００３】この測定方法は、１対の針状電極間に、常
に正又は負の電圧が印加されるため、被計測物中の水の
中にイオンが存在すると電極にイオンが集中する。従っ
て、例えば、瓦、外壁材等の含水率を計測した場合、正
極電極に酸化カルシウムの電離した酸素イオン (Ｏ2-)
が集中してその電極が腐食するという現象が見られた２
Fe＋３Ｏ2-→ Fe2Ｏ3)。このような現象が起こると、電
極自体の抵抗が変化して適切な測定ができなくなる。In this measuring method, a positive or negative voltage is always applied between the pair of needle-shaped electrodes, so that if ions are present in water in the object to be measured, the ions will be concentrated on the electrodes. Therefore, for example, when the water content of roof tiles, outer wall materials, etc. is measured, oxygen ions (O 2− ) of calcium oxide ionized in the positive electrode
The phenomenon that the electrodes were concentrated and the electrodes were corroded 2
Fe + 3O 2− → Fe 2 O 3 ). When such a phenomenon occurs, the resistance of the electrode itself changes, and proper measurement cannot be performed.
【０００４】そこで、本願出願人は、特願平２−１３３
６４において、例えば直流２Ｖの電圧を計測時のみに印
加し、かつその場合の極性を交互に変える計測方法を提
案した。このものは、電極が腐食するという現象を大幅
に抑制することができた。Therefore, the applicant of the present application has filed Japanese Patent Application No. 2-133.
In 64, for example, a measurement method in which a DC voltage of 2 V is applied only during measurement and the polarity in that case is alternately changed was proposed. This product was able to significantly suppress the phenomenon of electrode corrosion.
【０００５】[0005]
【発明が解決しようとする課題】前述の特願平２−１３
３６４において提案した含水率の計測方法は、電極が腐
食するという現象を大幅に抑制することができるもの
の、正極電極に電離した酸素イオン (Ｏ2-) が集中する
現象そのものを除去することはできないので、長期間使
用した場合、やがては電極が腐食するという現象が起こ
り得るものである。DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention
Although the water content measurement method proposed in 364 can significantly suppress the phenomenon of electrode corrosion, it cannot remove the phenomenon itself of concentration of ionized oxygen ions (O 2− ) in the positive electrode. Therefore, when used for a long period of time, the phenomenon that the electrodes corrode may occur.
【０００６】本発明は、かかる事由に鑑みてなしたもの
で、その目的とするところは、電極におけるイオン反応
を殆ど皆無にして精度の高い計測が行える含水率の計測
方法を提供するにある。The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a method for measuring a water content capable of performing highly accurate measurement with almost no ionic reaction in an electrode.
【０００７】[0007]
【課題を解決するための手段】かかる課題を解決するた
めに、請求項１記載の含水率の計測方法は、先端部が被
計測物中において所定量離間して対向するよう一対の針
状電極を配置し、この１対の針状電極間に電圧を印加し
てその間の抵抗を測定し、この抵抗値と既知の含水率及
び抵抗値により作成された検量線とを照合することによ
り、被計測物の含水率を計測する方法において、前記針
状電極間に交流微小電圧を印加する方法としている。In order to solve such a problem, a method for measuring a water content according to a first aspect of the present invention is such that a pair of needle-shaped electrodes are arranged so that their tips are opposed to each other with a predetermined distance in the object to be measured. Is placed, a voltage is applied between the pair of needle-shaped electrodes to measure the resistance therebetween, and the resistance value is compared with the calibration curve created by the known water content and resistance value, In the method of measuring the water content of the measurement object, a method of applying an AC minute voltage between the needle electrodes is used.
【０００８】また、請求項２記載の含水率の計測方法
は、請求項１記載の針状電極を２対とした方法としてい
る。Further, the method for measuring the water content according to claim 2 is a method in which two pairs of needle-like electrodes according to claim 1 are used.
【０００９】[0009]
【作用】請求項１記載の方法によれば、針状電極間に印
加される電圧は交流微小電圧であるため電極におけるイ
オン反応を殆ど皆無となる。According to the method of the first aspect, since the voltage applied between the needle electrodes is an AC minute voltage, almost no ionic reaction occurs at the electrodes.
【００１０】また、請求項２記載の方法によれば、請求
項１記載の作用に加え、２個の抵抗値の平均をとること
により抵抗値の精度がより向上させられる。According to the method of claim 2, in addition to the operation of claim 1, the accuracy of the resistance value is further improved by taking the average of the two resistance values.
【００１１】[0011]
【実施例】以下、本発明の一実施例を図１乃至図３に基
づいて説明する。図１は、１対の針状電極を有するセン
サ部1 を示している。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. FIG. 1 shows a sensor unit 1 having a pair of needle electrodes.
【００１２】2 は電極支持部材で、シリコンゴムにより
円板状をなしている。この実施例では、直径を40mm、厚
さを15mmとしている。Reference numeral 2 denotes an electrode supporting member, which is made of silicon rubber and has a disk shape. In this embodiment, the diameter is 40 mm and the thickness is 15 mm.
【００１３】3,4 は一対の針状電極で、大径の頭部3a,4
a と円錐状の先端部3b,4b とを有し、全長は電極支持部
材2 の厚さより十分に長い形状となっている。各針状電
極3,4 は、先端部3b,4b が被計測物中において所定量離
間して対向するよう電極支持部材2 に貫通して配置され
る。また、頭部3a,4a には、後述する電源部と抵抗測定
部に至るリード線を接続する。この実施例では、長さを
25mm、先端部3a,4a の離間距離を10mmとしている。Reference numerals 3 and 4 denote a pair of needle-shaped electrodes, which have large diameter heads 3a and 4
It has a and the conical tip portions 3b and 4b, and its overall length is sufficiently longer than the thickness of the electrode supporting member 2. The needle-shaped electrodes 3 and 4 are arranged so as to penetrate the electrode support member 2 so that the tip portions 3b and 4b face each other in the object to be measured with a predetermined distance therebetween. In addition, the heads 3a and 4a are connected to a power supply section and a lead wire leading to a resistance measuring section, which will be described later. In this example,
The distance between the tip portions 3a and 4a is 25 mm, and the distance between them is 10 mm.
【００１４】図２は、抵抗測定を行うための回路図を示
している。5 は電源部で、発振器により１０Hz、２０mV
の微小電圧を出力する。6 は抵抗測定部で、電流検出抵
抗7、増幅器8 、ローパスフィルタ9 、整流回路10等を
有する。電流検出抵抗7 は、電源部5 やセンサ部1 の２
個の電極3,4 に直列に介挿されるもので、この実施例で
は、その抵抗値を１ＭΩとしている。この抵抗測定部6
は、２個の電極3,4 間の抵抗値に応じた電流が電流検出
抵抗7 に流れてその両端に交流電圧が発生し、この交流
電圧を増幅器8 にて増幅し、ローパスフィルタ9 を介し
て整流回路10にて整流することにより、電極3,4 間の抵
抗値に応じた直流電圧が得られる。FIG. 2 shows a circuit diagram for performing resistance measurement. 5 is a power supply part, and 10Hz, 20mV by an oscillator
Outputs a very small voltage. Reference numeral 6 is a resistance measuring unit, which has a current detecting resistor 7, an amplifier 8, a low-pass filter 9, a rectifying circuit 10 and the like. The current detection resistor 7 is connected to the power supply section 5 and the sensor section 1 2
The electrodes are inserted in series to the individual electrodes 3 and 4. In this embodiment, the resistance value is 1 MΩ. This resistance measuring unit 6
A current corresponding to the resistance value between the two electrodes 3 and 4 flows into the current detection resistor 7 and an AC voltage is generated at both ends of the current detection resistor 7. The AC voltage is amplified by the amplifier 8 and passed through the low pass filter 9. By rectifying with the rectifying circuit 10, a DC voltage corresponding to the resistance value between the electrodes 3 and 4 can be obtained.
【００１５】図３は、被測定物である例えば外壁材11の
含水率を計測する際の概略図を示している。FIG. 3 is a schematic diagram for measuring the water content of an object to be measured, for example, the outer wall material 11.
【００１６】図４は、含水率が既知の外壁材における含
水率に対する抵抗値の関係を示す検量線である。被計測
物の含水率は、前述した抵抗測定部6 によって得られた
抵抗値をこの検量線に照合して得られるのである。FIG. 4 is a calibration curve showing the relationship between the water content and the resistance value of the outer wall material having a known water content. The water content of the measured object is obtained by matching the resistance value obtained by the resistance measuring unit 6 with this calibration curve.
【００１７】かかる含水率の計測方法によれば、針状電
極間に印加される電圧は交流微小電圧であるため電極に
おけるイオン反応を殆ど皆無にできる。According to such a method for measuring the water content, since the voltage applied between the needle electrodes is an AC minute voltage, almost no ionic reaction can occur at the electrodes.
【００１８】なお、１対の針状電極を２対にして２個の
抵抗値が測定できるようにすれば、その平均値を求める
ことにより抵抗値の精度がより向上させられる。この場
合、電流検出抵抗を２個設けて抵抗測定部で演算しても
よいし、電流検出抵抗を１個にして２個の合成抵抗に基
づく電流を電流検出抵抗に流すようにしてもよい。If one pair of needle electrodes is made into two pairs so that two resistance values can be measured, the accuracy of the resistance value can be further improved by obtaining the average value. In this case, two current detecting resistors may be provided and the resistance measuring unit may perform the calculation, or one current detecting resistor may be used and a current based on the two combined resistors may be passed through the current detecting resistor.
【００１９】[0019]
【発明の効果】請求項１記載の含水率の計測方法は、針
状電極間に印加される電圧は交流微小電圧であるため電
極におけるイオン反応を殆ど皆無となり、精度の高い計
測が行える。According to the method of measuring the water content of the first aspect of the present invention, since the voltage applied between the needle electrodes is an AC minute voltage, there is almost no ionic reaction in the electrodes, and highly accurate measurement can be performed.
【００２０】また、請求項２記載の含水率の計測方法
は、請求項１記載の作用効果に加え、２個の抵抗値の平
均をとることにより抵抗値の精度がより向上させられ、
よってさらに精度の高い計測が行える。Further, in the water content measuring method according to the second aspect, in addition to the effect of the first aspect, the accuracy of the resistance value is further improved by averaging the two resistance values.
Therefore, more accurate measurement can be performed.
【図１】本発明の一実施例を示すセンサ部の斜視図であ
る。FIG. 1 is a perspective view of a sensor unit according to an embodiment of the present invention.
【図２】本発明の一実施例を示す回路図である。FIG. 2 is a circuit diagram showing an embodiment of the present invention.
【図３】被計測物の抵抗値を計測する際の概略図であ
る。FIG. 3 is a schematic diagram when measuring a resistance value of an object to be measured.
【図４】検量線の一例を示す特性図である。FIG. 4 is a characteristic diagram showing an example of a calibration curve.
1 センサ部 2 電極支持部材 3 ,4 電極 3a,4a 電極の頭部 3b,4b 電極の先端部 5 電源部 6 抵抗測定部 7 電極検出抵抗 8 増幅器 9 ローパスフィルタ 10 整流回路 11 被測定物である外壁材 1 Sensor section 2 Electrode support member 3, 4 Electrode 3a, 4a Electrode head 3b, 4b Electrode tip 5 Power supply section 6 Resistance measurement section 7 Electrode detection resistance 8 Amplifier 9 Low-pass filter 10 Rectifier circuit 11 It is the object to be measured. Outer wall material
Claims (2)
間して対向するよう１対の針状電極を配置し、この一対
の針状電極間に電圧を印加してその間の抵抗を測定し、
この抵抗値と既知の含水率及び抵抗値により作成された
検量線とを照合することにより、被計測物の含水率を計
測する方法において、前記針状電極間に交流微小電圧を
印加することを特徴とする含水率の計測方法。1. A pair of needle-shaped electrodes are arranged such that their tips are opposed to each other with a predetermined distance in the object to be measured, and a voltage is applied between the pair of needle-shaped electrodes to measure the resistance therebetween. ,
By comparing this resistance value with the calibration curve created by the known water content and resistance value, in the method of measuring the water content of the object to be measured, it is possible to apply an AC minute voltage between the needle electrodes. Characteristic method of measuring water content.
載の含水率の計測方法。2. The water content measuring method according to claim 1, wherein the needle electrodes are provided in two pairs.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5607893A JPH06265497A (en) | 1993-03-16 | 1993-03-16 | Measuring method of water content |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5607893A JPH06265497A (en) | 1993-03-16 | 1993-03-16 | Measuring method of water content |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH06265497A true JPH06265497A (en) | 1994-09-22 |
Family
ID=13017057
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP5607893A Pending JPH06265497A (en) | 1993-03-16 | 1993-03-16 | Measuring method of water content |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH06265497A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2014089566A (en) * | 2012-10-30 | 2014-05-15 | Misawa Homes Co Ltd | Water content meter, and building with built-in water content meter |
| JP2016107212A (en) * | 2014-12-08 | 2016-06-20 | 株式会社Ihi | Centrifugal separator |
-
1993
- 1993-03-16 JP JP5607893A patent/JPH06265497A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2014089566A (en) * | 2012-10-30 | 2014-05-15 | Misawa Homes Co Ltd | Water content meter, and building with built-in water content meter |
| JP2016107212A (en) * | 2014-12-08 | 2016-06-20 | 株式会社Ihi | Centrifugal separator |
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