JPH0394148A - Moisture measuring method - Google Patents
Moisture measuring methodInfo
- Publication number
- JPH0394148A JPH0394148A JP1231875A JP23187589A JPH0394148A JP H0394148 A JPH0394148 A JP H0394148A JP 1231875 A JP1231875 A JP 1231875A JP 23187589 A JP23187589 A JP 23187589A JP H0394148 A JPH0394148 A JP H0394148A
- Authority
- JP
- Japan
- Prior art keywords
- water content
- neutron
- moisture
- moisture content
- unit time
- 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.)
- Granted
Links
- 238000000034 method Methods 0.000 title description 5
- 238000009826 distribution Methods 0.000 claims abstract description 49
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 98
- 238000012360 testing method Methods 0.000 claims description 11
- 239000000463 material Substances 0.000 claims description 5
- 238000000691 measurement method Methods 0.000 claims description 3
- 239000002245 particle Substances 0.000 claims 1
- 229920005830 Polyurethane Foam Polymers 0.000 description 15
- 239000011496 polyurethane foam Substances 0.000 description 15
- 238000005259 measurement Methods 0.000 description 5
- 239000011810 insulating material Substances 0.000 description 4
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000002474 experimental method Methods 0.000 description 2
- 125000004435 hydrogen atom Chemical group [H]* 0.000 description 2
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 239000012774 insulation material Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000003672 processing method Methods 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
Landscapes
- Analysing Materials By The Use Of Radiation (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は、例えばＬＮＧ輸送配管の保温材などの各種被
検査体に含まれる水分の分布及び含水量（ｇ／ｃｃ）を
調べるための水分測定法に関する。Detailed Description of the Invention [Industrial Field of Application] The present invention is a method for measuring moisture distribution and moisture content (g/cc) contained in various test objects such as heat insulating materials for LNG transport piping. Regarding measurement methods.
従来、被検査体の一部をサンプルとして切取り、そのサ
ンプルによって水分の分布と含水量を推定していた。Conventionally, a part of the object to be inspected has been cut out as a sample, and the moisture distribution and water content have been estimated from that sample.
〔発明が解決しようとする課題〕
しかし、含水量を正確に測定することが極めて困難であ
り、サンプルを切取った箇所の補修が面倒であり、測定
に多くの時間が必要である等の欠点があった。[Problems to be solved by the invention] However, there are drawbacks such as it is extremely difficult to accurately measure the water content, it is troublesome to repair the part where the sample was cut, and a lot of time is required for measurement. was there.
本発明の目的は、被検査体を破壊せずに、水分の分布と
含水量を正確にかつ容易迅速に測定できるようにする点
にある。An object of the present invention is to enable accurate, easy and rapid measurement of moisture distribution and moisture content without destroying the object to be inspected.
本発明の特徴手段は、
被検査体と同材料のサンプルに対して第１設定間隔で設
置した中性子水分計から単位時間当り一定個数の速中性
子を放射し、前記サンプルにその厚さ方向における既知
の含水域分布で含まれる既知含水量の水分の作用により
生じた熱中性子を前記中性子水分計で捕捉して、その捕
捉した熱中性子の単位時間当りの個数である中性子計数
率を計測し、複数の含水域分布夫々における含水量と中
性子計数率の第１標準相関を予め求めておき、かつ、
前記被検査体と同材料のサンプルに対して第２設定間隔
で設置した中性子水分計から単位時間当り一定個数の速
中性子を放射し、前記サンプルにその厚さ方向における
既知の含水域分布で含まれる既知含水量の水分の作用に
より生じた熱中性子を前記中性子水分計で捕捉して、そ
の捕捉した熱中性子の単位時間当りの個数である中性子
計数率を計測し、複数の含水域分布夫々における含水量
と中性子計数率の第２標準相関を予め求めておき、そし
て、
前記被検査体に対して前記第１設定間隔で設置した中性
子水分計から単位時間当り一定個数の速中性子を放射し
、前記被検査体に含まれる水分の作用により生じた熱中
性子を前記中性子水分計で捕捉して、その捕捉した熱中
性子の単位時間当りの個数である第１中性子計数率を求
め、かつ、
前記被検査体に対して前記第２設定間隔で設置した中性
子水分計から単位時間当り一定個数の速中性子を放射し
、前記被検査体に含まれる水分の作用により生じた熱中
性子を前記中性子水分計で捕捉して、その捕捉した熱中
性子の単位時間当りの個数である第２中性子計数率を求
め、そして、
前記第１中性子計数率と前記第１標準相関に基いて前記
複数の含水域分布夫々における第１含水量を求め、かつ
、
前記第２中性子計数率と前記第２標準相関に基いて前記
複数の含水域分布夫々における第２含水量を求め、そし
て、
前記第ｌ含水量と前記第２含水量がほぼ等しくなるもの
を前記複数の含水域分布から判定し、その判定した含水
域分布に水分が偏在すると共に、前記ほぼ等しい第１及
び第２含水量で水分が含まれると判定することにあり、
その作用・効果は次の通りである。The characteristic means of the present invention is to emit a fixed number of fast neutrons per unit time from neutron moisture meters installed at first set intervals to a sample made of the same material as the object to be inspected, and to emit a fixed number of fast neutrons to the sample in the thickness direction. Thermal neutrons generated by the action of water with a known water content contained in the water content distribution are captured by the neutron moisture meter, and the neutron count rate, which is the number of captured thermal neutrons per unit time, is measured. The first standard correlation between the water content and the neutron count rate in each water content distribution is determined in advance, and the sample of the same material as the object to be inspected is measured by a neutron moisture meter installed at a second set interval for a unit time. emitting a certain number of fast neutrons per sample, and capturing thermal neutrons generated by the action of water with a known water content contained in the sample with a known water content distribution in the thickness direction using the neutron moisture meter; neutron count rate, which is the number of thermal neutrons per unit time, is determined in advance, and a second standard correlation between water content and neutron count rate in each of a plurality of water content distributions is determined in advance; emitting a fixed number of fast neutrons per unit time from the neutron moisture meter installed at the first set interval, and capturing thermal neutrons generated by the action of moisture contained in the object to be inspected with the neutron moisture meter, Determine the first neutron count rate, which is the number of captured thermal neutrons per unit time, and obtain a fixed number of fast neutrons per unit time from a neutron moisture meter installed at the second set interval with respect to the object to be inspected. , and capturing thermal neutrons generated by the action of moisture contained in the test object with the neutron moisture meter, and determining a second neutron count rate, which is the number of captured thermal neutrons per unit time, and determining a first water content in each of the plurality of water-containing area distributions based on the first neutron count rate and the first standard correlation, and calculating the first water content based on the second neutron count rate and the second standard correlation. Determine the second water content in each of the plurality of water content distributions, determine from the plurality of water content distributions the one where the first water content and the second water content are approximately equal, and apply the determined water content distribution to the water content distribution. determining that moisture is unevenly distributed and that moisture is contained at the substantially equal first and second moisture contents;
Its actions and effects are as follows.
被検査体の全体に水分が含まれている場合、中性子水分
計により被検査体に単位時間当り一定個数の速中性子を
放射し、水分の水素原子との弾性散乱によりエネルギー
を失った熱中性子を中性子水分計で捕捉して、捕捉した
熱中性子の単位時間当りの個数である中性子計数率を計
測すると、その中性子計数率と含水量の相関が被検査体
の材質や厚さで定まる一定の相関関係があるために、被
検査体の含水量を正確に測定できることは知られている
。しかし、含水域分布が変化すると、つまり、水分が被
検査体の厚さ方向において偏在すると、正確な含水量測
定が不可能であった。If the entire surface of the object to be inspected contains moisture, a neutron moisture meter emits a fixed number of fast neutrons per unit time to the object, and emits thermal neutrons that have lost energy due to elastic scattering with hydrogen atoms in the moisture. When a neutron moisture meter captures thermal neutrons and measures the neutron count rate, which is the number of captured thermal neutrons per unit time, the correlation between the neutron count rate and moisture content is a certain correlation determined by the material and thickness of the inspected object. It is known that the water content of a test object can be determined accurately because of the relationship. However, when the distribution of water content changes, that is, when water is unevenly distributed in the thickness direction of the test object, accurate water content measurement is impossible.
そこで、含水域分布が変化して不明であっても含水量測
定を正確に実行できるようにするためには、いかなる手
法が有効であるかを、各種実験により追究したところ、
次の事実が判明した。Therefore, we conducted various experiments to find out what method would be effective in making it possible to accurately measure water content even if the water content distribution has changed and is unknown.
The following facts were discovered.
（イ）
第４図（イ）に示すようにポリウレタンフォーム（７）
の外側部分（７ａ）に水分が偏在する場合、第４図（口
）に示すようにポリウレタンフォーム（７）の中側部分
（７ｂ）に水分が偏在する場合、第４図（ハ）に示すよ
うにポリウレタンフォーム（７）の内側部分（７ｃ）に
水分が偏在する場合の夫々について、中性子水分計を用
いて、中性子計数率と含水量の相関を調べたところ、第
５図に示すように、いずれの場合も直線的ではないが一
定の相関になり、かつ、場合により相関が相違する事実
を確認できた。(a) Polyurethane foam (7) as shown in Figure 4 (a)
When moisture is unevenly distributed in the outer part (7a) of the polyurethane foam (7), as shown in Fig. 4 (opening), when moisture is unevenly distributed in the inner part (7b) of the polyurethane foam (7), as shown in Fig. 4 (c). When we investigated the correlation between the neutron count rate and the water content using a neutron moisture meter in each case where water was unevenly distributed in the inner part (7c) of the polyurethane foam (7), we found that the results were as shown in Figure 5. Although the correlation was not linear in all cases, it was confirmed that the correlation was constant, and that the correlation differed depending on the case.
（口）第４図（イ）乃至（ハ）に実線で示すように中性
子水分計（４）を密着させた場合と、第４図（イ）乃至
（ハ）に点線で中性子水分計（４）を３０ｍｍ離した場
合とで、上記（イ）項の中性子計数率と含水量の相関が
いかに変化するかを調べたところ、第５図に示すように
、水分の偏在位置いかんにかかわらず相関が大きく変化
し、かつ、その変化が水分の偏在位置によって相違する
事実を確認できた。(Explanation) Figure 4 (A) to (C) show the case where the neutron moisture meter (4) is placed in close contact as shown by the solid lines, and the dotted line in Figure 4 (A) to (C) shows the case where the neutron moisture meter (4) ) When we investigated how the correlation between the neutron count rate and water content in item (a) above changes when the neutron count rate and water content are separated by 30 mm, we found that there is a correlation regardless of the uneven distribution position of water, as shown in Figure 5. It was confirmed that the amount of water changes greatly, and that this change differs depending on the uneven distribution position of water.
そして、上記（ロ）項の実験結果を詳細に検討しかつ解
析し、次のような新規な技術的考えを得た。The experimental results in section (b) above were examined and analyzed in detail, and the following new technical idea was obtained.
つまり、第４図（イ）乃至（ハ）に示すように、サンプ
ル（Ｂ）に対して第１設定間隔（ｊ７１＝ｏ）で設置し
た中性子水分計（４）により、複数の含水域分布（外側
、中側、内側）夫々における含水量と中性子計数率の第
１標準相関［外（Ｘ１）、中（Ｙ１〉、内（Ｚｌ）］を
予め求めておき、かつ、サンプル（Ｂ）に対して第２設
定間隔（ｊＬ＝３０ｍｍ）で設置した中性子水分計（４
）により、上記複数の含水域分布夫々における含水量と
中性子計数率の第２標準相関［外（Ｘ２）、中（Ｙ２）
、内（Ｚ２）］を予め求めておいて、下記（ａ）〜（ｅ
）項の手段を講じると、含水域分布が変化して不明であ
っても、含水量を正確に測定できる。In other words, as shown in FIGS. 4(a) to 4(c), the neutron moisture meter (4) installed at the first setting interval (j71=o) for the sample (B) measures the distribution of water content ( The first standard correlation between water content and neutron count rate [outer (X1), middle (Y1〉, inner (Zl)] for each of the outer, middle, and inner sides) is determined in advance, and A neutron moisture meter (4
), the second standard correlation between water content and neutron count rate [outer (X2), middle (Y2)
, inside (Z2)] is determined in advance, and the following (a) to (e
By taking the measures in section ), it is possible to accurately measure water content even if the water content distribution has changed and is unknown.
（ａ） 第ｌ図に実線で示すように、被検査体（Ａ）
に対して前記第１設定間隔（ｌ＋＝０）で設置した中性
子水分計（４）により、第ｌ中性子計数率（ｎ ＋ ＝
８０００ ）を得る。(a) As shown by the solid line in Figure 1, the object to be inspected (A)
The neutron moisture meter (4) installed at the first set interval (l + = 0) calculates the lth neutron count rate (n + =
8000).
（ｂ） 第１図に点線で示すように、被検査体（Ａ）
に対して前記第２設定間隔（Ｉｌ２＝３０ｍｍ）で設置
した中性子水分計（４）により、第２中性子計数率（ｎ
２ξ３４００）を得る。(b) As shown by the dotted line in Figure 1, the object to be inspected (A)
The second neutron count rate (n
2ξ3400) is obtained.
（ｃ） 第６図に示すように、第ｌ中性子計数率（ｎ
１−８０００）と第１標準相関［外（Ｘ．）、中（Ｙ１
）、内（Ｚｌ）］に基いて、複数の含水域分布夫々にむ
ける第ｌ含水量（交点Ａ， Ｂ， Ｃに相当する含水量
）を求める。(c) As shown in Figure 6, the lth neutron count rate (n
1-8000) and the first standard correlation [outside (X.), inside (Y1
), within (Zl)], the l-th water content (water content corresponding to intersection points A, B, and C) for each of the plurality of water-containing water distributions is determined.
（ｄ） 第６図に示すように、第２中性子計数率（ｎ
ｇ ＝ ３４００）と第２標準相関［外（ｘ２）、中（
Ｙ２）、内（ｚ２）］に基いて、複数の含水域分布夫々
における第２含水量（交点Ｄ， Ｅ， Ｆに相当する含
水量）を求める。(d) As shown in Figure 6, the second neutron count rate (n
g = 3400) and the second standard correlation [outside (x2), inside (
Y2), within (z2)], the second water content (water content corresponding to the intersections D, E, F) in each of the plurality of water content distributions is determined.
（ｅ） 第６図に示すように、第ｌ含水量と第２含水
量がほぼ等しくなるものを複数の含水域分布から判定し
、つまり、ＡＤＤ， Ｂｆ＝Ｅ，Ｃ−Ｉ＝Ｆから水分が
外側に偏在しているというように水分の分布を判定し、
かつ、含水量が約０． ３２ｇ／ｃｃというように含水
量を判定する。(e) As shown in Figure 6, the water content where the first water content and the second water content are almost equal is determined from the distribution of multiple water areas, that is, the water content is determined from ADD, Bf=E, C-I=F. Determine the distribution of moisture such that it is unevenly distributed on the outside,
And the water content is about 0. Determine the water content as 32 g/cc.
要するに、本願発明の特徴手段によれば、従来中性子水
分計による測定では正確な含水量測定が不可能と観念さ
れていた、含水域分９
１０
布が変化して不明な場合であっても、変化するであろう
と予測される含水域分布夫々に対して、第１標準相関と
第２標準相関を予め求めておけば、水分の分布と含水量
を正確に測定でき、しかも、被検査体を破壊しなくて済
む。In short, according to the characteristic means of the present invention, even when the moisture content is unknown due to changes in the water content, which was conventionally thought to be impossible to measure using a neutron moisture meter, If the first standard correlation and second standard correlation are calculated in advance for each water content distribution that is predicted to change, it is possible to accurately measure the moisture distribution and moisture content. No need to destroy it.
その結果、保温材の含水による劣化の検査などにおいて
、被検査体を破壊せずに、水分の分布と含水量を正確に
かつ容易迅速に測定できる、新規かつ有用な水分測定法
を確立できた。As a result, we were able to establish a new and useful moisture measurement method that can accurately, easily and quickly measure moisture distribution and moisture content without destroying the test object, such as when inspecting the deterioration of insulation materials due to moisture content. .
次に実施例を示す。 Next, examples will be shown.
第１図に示すように、ＳＵＳ製のパイプ（ｌ）を多孔質
のポリウレタンフォーム（２）で覆って保冷し、ポリウ
レタンフォーム（２）を外装用板金（３）で覆ったＬＮ
Ｇ輸送配管において、外部に設置した中性子水分計（４
）によりポリウレタンフォーム（２）に含まれる水分の
分布及び含水量を調べる場合について説明する。As shown in Figure 1, a SUS pipe (l) is covered with porous polyurethane foam (2) to keep it cool, and the polyurethane foam (2) is covered with an exterior sheet metal (3).
In the G transport piping, a neutron moisture meter (4
) to investigate the water distribution and water content contained in polyurethane foam (2) will be explained.
中性子水分計（４）は、第２図に示すように、２本の検
出器（４ａ）の中央に線源（４ｂ）を配置し、線源（４
ｂ）からの単位時間当り一定個数（個／分）の速中性子
をポリウレタンフォーム（２）に放射し、水分中の水素
原子との弾性散乱によりエネルギーを失った熱中性子の
みを検出器（４ａ）で捕捉し、カウンター（４ｃ）で捕
捉した熱中性子の単位時間当りの個数（個／分）を計測
し、その計測した中性子計数率を表示部（４ｄ）で示す
ように構成したものである。As shown in Figure 2, the neutron moisture meter (4) has a radiation source (4b) placed in the center of two detectors (4a).
A fixed number of fast neutrons per unit time (number/minute) from b) are emitted to the polyurethane foam (2), and only the thermal neutrons that have lost energy due to elastic scattering with hydrogen atoms in water are detected by the detector (4a). The counter (4c) measures the number of thermal neutrons captured per unit time (pieces/minute), and the measured neutron counting rate is shown on the display (4d).
先ず、標準相関の求め方を説明する。First, we will explain how to find the standard correlation.
（イ）第３図に示すように、実配管（Ａ）を平板でモデ
ル化したサンプル（Ｂ）を準備する。(a) As shown in FIG. 3, prepare a sample (B) that is a flat plate model of the actual piping (A).
つまり、水素濃度がＬＮＧとほぼ等しい厚さ１０ｍｍの
アクリル（５）をｌ２枚重ねて、ＬＮＧに相当する層を
形成し、パイプ（ｌ）に相当する厚さ６ｍｍのＳＵＳ板
（６）をアクリル（５）に載せ、ポリウレタンフォーム
（２）に相当する厚さ１０ｍｍのポリウレタンフォーム
（７）を１２枚ＳＵＳ板（６）に載せ、外装用板金（３
）に相当１ｌ
する板金（８）をポリウレタンフォーム（７）に載せて
、サンプル（Ｂ）を形成する。In other words, two sheets of acrylic (5) with a thickness of 10 mm, whose hydrogen concentration is almost equal to that of LNG, are stacked to form a layer corresponding to LNG, and a SUS plate (6) with a thickness of 6 mm, which corresponds to the pipe (l), is made of acrylic. (5), 12 sheets of polyurethane foam (7) with a thickness of 10 mm, which corresponds to polyurethane foam (2), were placed on the SUS board (6), and
) is placed on the polyurethane foam (7) to form a sample (B).
（口）第４図（イ）に示すように外側の４枚のポリウレ
タンフォーム（７ａ）に水分を含ませた場合、第４図（
ロ）に示すように中側の４枚のポリウレタンフォーム（
７ｂ）に水分を含ませた場合、第４図（ハ）に示すよう
に内側の４枚のポリウレタンフォーム（７ｃ）に水分を
含ませた場合の夫々について、含水量を種々変更設定し
、それら含水域分布及び含水量が既知のサンプル（Ｂ）
夫々に対して第ｌ設定間隔１１＝０で、つまり密着させ
て設置した中性子水分計（４）から速中性子を放射し、
水分とアクリル（５）の作用により生じた熱中性子を中
性子水分計（４）で捕捉して、中性子計数率を計測し、
第５図に示すように、複数の含水域分布夫々における含
水量と中性子計数率の第１標準相関［外（Ｘ＋）、中（
Ｙ１）、内（Ｚｌ）］を求める。(Exposure) When the four outer polyurethane foams (7a) are soaked with water as shown in Figure 4 (A), as shown in Figure 4 (A),
As shown in (b), the inner four sheets of polyurethane foam (
7b) and when the four inner polyurethane foams (7c) are soaked with water as shown in Figure 4(c), the water content was variously changed and set. Sample with known water content distribution and water content (B)
Emit fast neutrons from the neutron moisture meter (4) installed at the lth set interval 11=0, that is, in close contact with each other,
Thermal neutrons generated by the action of moisture and acrylic (5) are captured by a neutron moisture meter (4), and the neutron count rate is measured.
As shown in FIG.
Y1), within (Zl)].
（ハ）上記（口）項と同様にして、含水域分布と含水量
が既知で種々変更設定したサンプル（Ｂ）１２
夫々に対して、第４図（イ）〜（ハ）に示すように第２
設定間隔ｊ＃＝３０ｍｍで設置した中性子水分計（４）
により中性子計数率を計測する。(C) Samples with known water content distribution and water content, and various settings were made in the same manner as in the above (Part 2). Second
Neutron moisture meter installed at setting interval j#=30mm (4)
Measure the neutron count rate.
そして、第５図に示すように、複数の含水域分布夫々に
おける含水量と中性子計数率の第２標準相関［外（ｘ２
）、中（Ｙ２）、内（Ｚ２）］ ヲ求める。As shown in Fig. 5, the second standard correlation [out(x2
), inside (Y2), inside (Z2)] Find wo.
次に、実配管（Ａ）の水分測定法を説明する。Next, a method for measuring moisture in actual piping (A) will be explained.
（ａ） 第１図に示すように、実配管（Ａ）に対して
前記第１設定間隔１１＝０で設置した中性子水分計（４
）から速中性子を放射し、中性子水分計（４）により第
ｌ中性子計数率（ｎ＋＝８０００）を求める。(a) As shown in Figure 1, a neutron moisture meter (4
), and the l-th neutron count rate (n+=8000) is determined using a neutron moisture meter (4).
（ｂ） 第１図に示すように、実配管（Ａ）に対して
前記第２設定間隔Ａ’２＝３０ｍｍで設置した中性子水
分計（４）から速中性子を放射し、中性子水分計（４）
により第２中性子計数率（ｎ２＃３４００）を求める。(b) As shown in FIG. )
The second neutron count rate (n2#3400) is determined by:
（ｃ） 第６図に示すように、第１中性子計数率（ｎ
ｌ−８０００）と予め求めておいた第１標準相１３
１４
関［外（Ｘ１）、中（Ｙ１）、内（Ｚｌ）］に基いて、
複数の含水域分布夫々における第１含水量（交点Ａ，
Ｂ， Ｃに相当する含水量）を求める。(c) As shown in Figure 6, the first neutron count rate (n
l-8000) and the first standard phase 13 14 obtained in advance [outside (X1), inside (Y1), inside (Zl)],
The first water content (intersection A,
Find the water content (corresponding to B and C).
（ｄ） 第６図に示すように、第２中性子計数率（ｎ
２＃３４００）と予め求めておいた第２標準相関［外（
Ｘ２）、中（Ｙ２）、内（Ｚ２）コに基いて、複数の含
水域分布夫々における第１含水量（交点Ｄ， Ｅ， Ｆ
に相当する含水量）を求める。(d) As shown in Figure 6, the second neutron count rate (n
2#3400) and the second standard correlation [outside (
X2), middle (Y2), and inner (Z2), the first water content (intersections D, E, F
(moisture content equivalent to).
（ｅ） 第６図に示すように、第１含水量と第２含水
量がほぼ等しくなるものを複数の含水域分布から判定し
、つまり、Ａ＝Ｄ． Ｂｆ−Ｅ， Ｃ≠Ｆから水分が外
側に偏在しているというように水分の分布を判定し、か
つ、含水率が約０．３２ｇ／ｃｃというように含水量を
判定する。(e) As shown in FIG. 6, one in which the first water content and the second water content are approximately equal is determined from a plurality of water content distributions, that is, A=D. From Bf-E, C≠F, the distribution of moisture is determined such that moisture is unevenly distributed on the outside, and the moisture content is determined such that the moisture content is approximately 0.32 g/cc.
尚、Ａ？’Ｂ， Ｂ＃Ｅ， Ｃ≠Ｆの場合は、水分が中
側に偏在して、Ｂ，Ｅに相当する含水量であると判定し
、また、Ａ≠Ｄ， Ｂｆ＝Ｅ， Ｃ＃Ｆの場合は、水分
が内側に偏在して、Ｃ，Ｆに相当する含水量であると判
定する。Furthermore, A? 'B, B#E, C≠F, moisture is unevenly distributed in the middle, and it is determined that the water content corresponds to B, E, and A≠D, Bf=E, C#F In the case of , it is determined that water is unevenly distributed inside and the water content corresponds to C and F.
次に別実施例を説明する。 Next, another embodiment will be described.
水分測定対象は、ポリウレタンフォーム（２）等の断熱
材（保温材、保冷材）が好適であるが、例えばコンクリ
ートなどの各種固体を測定対象にできる。また、それら
水分測定対象がいかなる用途であるかは不問であり、従
って、水分測定対象を被検査体（Ａ）と総称する。The moisture content to be measured is preferably a heat insulating material (heat insulating material, cold insulating material) such as polyurethane foam (2), but various solids such as concrete can also be measured. Moreover, it does not matter what purpose these moisture measurement objects are used for, and therefore, the moisture measurement objects are collectively referred to as the test object (A).
サンプル（Ｂ）の作り方は適当に選択でき、被検査体（
Ａ）とサンプル（Ｂ）が同材料で、望ましくは、同寸・
同形であれば良い。The method of preparing the sample (B) can be selected appropriately, and the sample (B) can be prepared as desired.
A) and sample (B) are made of the same material, preferably of the same size and size.
It is fine as long as it is the same shape.
被検査体（Ａ）と中性子水分計（４）の間における第１
設定間隔（ｌ１）及び第２設定間隔（ｌ２）は適当に選
定できるが、ｌ１＝０で、ｌ２は、ｌの中性子計数率に
対するｌ２の中性子計数率の比が各々の水分分布で異な
るように選定することが望ましい。The first part between the test object (A) and the neutron moisture meter (4)
The set interval (l1) and the second set interval (l2) can be selected appropriately, but when l1 = 0, l2 is set such that the ratio of the neutron counting rate of l2 to the neutron counting rate of l is different for each moisture distribution. It is desirable to select
第１及び第２標準相関を求めるに際して、含水域分布を
いかに選択するかは、被検査体（Ａ）の含水状況に見合
って適当に定められ、２種類以上の含水域分布を選択す
れば良い。When determining the first and second standard correlations, how to select the water-containing distribution is determined appropriately depending on the water content of the test object (A), and two or more types of water-containing distributions may be selected. .
１５
１６
第１及び第２標準相関は表であってもよく、あるいは、
コンピュータに記憶させたもので、第１及び第２中性子
計数率の入力に基いて含水域分布と含水量が自動的に判
定表示されるように、コンピュータがプログラムされて
いてもよい。15 16 The first and second standard correlations may be tables, or
The information may be stored in a computer, and the computer may be programmed to automatically determine and display the water content distribution and water content based on the input of the first and second neutron counting rates.
尚、特許請求の範囲の項に図面との対照を便利にする為
に符号を記すが、該記入により本発明は添付図面の構造
に限定されるものではない。Incidentally, although reference numerals are written in the claims section for convenient comparison with the drawings, the present invention is not limited to the structure shown in the accompanying drawings.
第１図及び第２図は本発明の実施例を示す概念図である
。第３図はサンプルの説明図である。
第４図（イ）ないし（ハ）は実験方法を示す概念図であ
り、第５図は実験結果を示すグラフである。
第６図はデータの処理方法を示すグラフである。
（Ａ）・・・・・・被検査体、（Ｂ）・・・・・・サン
プル、（４）・・・・・・中性子水分計。1 and 2 are conceptual diagrams showing an embodiment of the present invention. FIG. 3 is an explanatory diagram of a sample. 4(a) to 4(c) are conceptual diagrams showing the experimental method, and FIG. 5 is a graph showing the experimental results. FIG. 6 is a graph showing a data processing method. (A)...Test object, (B)...Sample, (4)...Neutron moisture meter.
Claims (1)
設定間隔（ｌ＿１）で設置した中性子水分計から単位時
間当り一定個数の速中性子を放射し、前記サンプル（Ｂ
）にその厚さ方向における既知の含水域分布で含まれる
既知含水量の水分の作用により生じた熱中性子を前記中
性子水分計（４）で捕捉して、その捕捉した熱中性子の
単位時間当りの個数である中性子計数率を計測し、複数
の含水域分布夫々における含水量と中性子計数率の第１
標準相関を予め求めておき、かつ、前記被検査体（Ａ）
と同材料のサンプル（Ｂ）に対して第２設定間隔（ｌ＿
２）で設置した中性子水分計（４）から単位時間当り一
定個数の速中性子を放射し、前記サンプル（Ｂ）にその
厚さ方向における既知の含水域分布で含まれる既知含水
量の水分の作用により生じた熱中性子を前記中性子水分
計（４）で捕捉して、その捕捉した熱中性子の単位時間
当りの個数である中性子計数率を計測し、複数の含水域
分布夫々における含水量と中性子計数率の第２標準相関
を予め求めておき、そして、 前記被検査体（Ａ）に対して前記第１設定間隔（ｌ＿１
）で設置した中性子水分計（４）から単位時間当り一定
個数の速中性子を放射し、前記被検査体（Ａ）に含まれ
る水分の作用により生じた熱中性子を前記中性子水分計
（４）で捕捉して、その捕捉した熱中性子の単位時間当
りの個数である第１中性子計数率を求め、かつ、 前記被検査体（Ａ）に対して前記第２設定間隔（ｌ＿２
）で設置した中性子水分計（４）から単位時間当り一定
個数の速中性子を放射し、前記被検査体（Ａ）に含まれ
る水分の作用により生じた熱中性子を前記中性子水分計
（４）で捕捉して、その捕捉した熱中性子の単位時間当
りの個数である第２中性子計数率を求め、そして、 前記第１中性子計数率と前記第１標準相関に基いて前記
複数の含水域分布夫々における第１含水量を求め、かつ
、 前記第２中性子計数率と前記第２標準相関に基いて前記
複数の含水域分布夫々における第２含水量を求め、そし
て、 前記第１含水量と前記第２含水量がほぼ等しくなるもの
を前記複数の含水域分布から判定し、その判定した含水
域分布に水分が偏在すると共に、前記ほぼ等しい第１及
び第２含水量で水分が含まれると判定する水分測定法。[Claims] The first test object (A) and the sample (B) made of the same material.
A fixed number of fast neutrons are emitted per unit time from the neutron moisture meter installed at set intervals (l_1), and the sample (B
) is captured by the neutron moisture meter (4) due to the action of water with a known water content contained in the known water content distribution in the thickness direction, and the thermal neutrons captured per unit time are The neutron count rate, which is the number of particles, is measured, and the first
A standard correlation is determined in advance, and the test object (A)
The second set interval (l_
A fixed number of fast neutrons are emitted per unit time from the neutron moisture meter (4) installed in 2), and the action of the known water content contained in the sample (B) with a known water content distribution in the thickness direction The thermal neutrons generated by the above are captured by the neutron moisture meter (4), and the neutron count rate, which is the number of captured thermal neutrons per unit time, is measured, and the water content and neutron count in each of the multiple water content distributions are calculated. A second standard correlation of the rate is determined in advance, and the first set interval (l_1
) A fixed number of fast neutrons are emitted per unit time from the neutron moisture meter (4) installed at capture and obtain a first neutron counting rate, which is the number of captured thermal neutrons per unit time; and
) A fixed number of fast neutrons are emitted per unit time from the neutron moisture meter (4) installed at capture and obtain a second neutron count rate, which is the number of captured thermal neutrons per unit time; and, based on the first neutron count rate and the first standard correlation, calculate determining a first water content, and determining a second water content in each of the plurality of water content distributions based on the second neutron count rate and the second standard correlation, and determining the first water content and the second water content. Moisture that is determined to have approximately equal water content from the plurality of water content distributions, and that water is unevenly distributed in the determined water content distribution and that water is contained at the substantially equal first and second water contents. Measurement method.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1231875A JPH0758253B2 (en) | 1989-09-06 | 1989-09-06 | Moisture measurement method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1231875A JPH0758253B2 (en) | 1989-09-06 | 1989-09-06 | Moisture measurement method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0394148A true JPH0394148A (en) | 1991-04-18 |
| JPH0758253B2 JPH0758253B2 (en) | 1995-06-21 |
Family
ID=16930394
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1231875A Expired - Lifetime JPH0758253B2 (en) | 1989-09-06 | 1989-09-06 | Moisture measurement method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0758253B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007121026A (en) * | 2005-10-26 | 2007-05-17 | Nippon Hihakai Kensa Kk | Inspection method of corrosion |
| JP5022886B2 (en) * | 2006-12-27 | 2012-09-12 | 株式会社日立エンジニアリング・アンド・サービス | Moisture detection method, moisture detection device and pipe inspection device |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60202337A (en) * | 1984-03-28 | 1985-10-12 | Nippon Doro Kodan | New calibrating method of radioisotope type densitometer and moisture meter |
-
1989
- 1989-09-06 JP JP1231875A patent/JPH0758253B2/en not_active Expired - Lifetime
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60202337A (en) * | 1984-03-28 | 1985-10-12 | Nippon Doro Kodan | New calibrating method of radioisotope type densitometer and moisture meter |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0758253B2 (en) | 1995-06-21 |
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