JPH0454410A - Conduit length measuring method - Google Patents
Conduit length measuring methodInfo
- Publication number
- JPH0454410A JPH0454410A JP16283190A JP16283190A JPH0454410A JP H0454410 A JPH0454410 A JP H0454410A JP 16283190 A JP16283190 A JP 16283190A JP 16283190 A JP16283190 A JP 16283190A JP H0454410 A JPH0454410 A JP H0454410A
- Authority
- JP
- Japan
- Prior art keywords
- pipe
- pulse signal
- conduit
- ultrasonic pulse
- length
- 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
- 238000000034 method Methods 0.000 title claims description 10
- 230000005540 biological transmission Effects 0.000 claims abstract description 32
- 239000013307 optical fiber Substances 0.000 claims abstract description 10
- 238000009529 body temperature measurement Methods 0.000 abstract description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 11
- 238000010586 diagram Methods 0.000 description 3
- 238000005259 measurement Methods 0.000 description 3
- 238000001069 Raman spectroscopy Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 229910052755 nonmetal Inorganic materials 0.000 description 2
- 230000002411 adverse Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 238000002604 ultrasonography Methods 0.000 description 1
Landscapes
- Length Measuring Devices Characterised By Use Of Acoustic Means (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は、地下に埋設され電カケープル等を布設するの
に用いられる管路の長さを測定する管路長測定方法の改
良に関するものである。[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to an improvement in a pipe length measuring method for measuring the length of a pipe buried underground and used for laying electric cables, etc. be.
（従来の技術）
従来から、管路長を測定するために、一方のマンホール
から管路に測量ローブを引き込み、他方のマンホールか
ら引き出して測量ローブの長さを求めていた。(Prior Art) Conventionally, in order to measure the length of a pipe, a surveying lobe was drawn into the pipe from one manhole and pulled out from the other manhole to determine the length of the surveying lobe.
（発明か解決しようとする８題）
しかし、測量ローブは、張力によって伸びか生し管路長
を正確に測定することがてきない。(8 problems to be solved by the invention) However, the surveying lobe stretches due to tension and cannot accurately measure the length of the pipe.
このため、この管路内に布設すべき電カケープル等を長
めに製造し、現地て余長を切断するのて、極めて不経済
であった。For this reason, it was extremely uneconomical to manufacture electrical cables and the like to be installed in the conduit in a longer length and then cut the excess length on site.
本発明の目的は、上記の欠点を回避するために、管路長
を正確に測定することかできる方法を提供することにあ
る。SUMMARY OF THE INVENTION The object of the present invention is to provide a method by which pipe length can be measured accurately in order to avoid the above-mentioned drawbacks.
（課題を解決するための手段）
本発明の第１の解決手段は、管路内に配置された光ファ
イバ分布型温度センサによって管路内温度分布を検出し
、また管路の一端から管路内に向けて発信した超音波パ
ルス信号を管路の他端て受信してこの超音波パルス信号
の伝達時間を検出し、超音波パルス信号の伝達速度を温
度分布で補正しつつ超音波パルス信号の伝達時間から管
路長を測定することを特徴とする管路長測定方法を提供
することにある。(Means for Solving the Problems) A first solution of the present invention is to detect the temperature distribution in the pipe by an optical fiber distribution type temperature sensor disposed in the pipe, and to detect the temperature distribution in the pipe from one end of the pipe. The ultrasonic pulse signal transmitted inward is received at the other end of the pipe, the transmission time of this ultrasonic pulse signal is detected, and the transmission speed of the ultrasonic pulse signal is corrected based on the temperature distribution. An object of the present invention is to provide a pipe length measuring method characterized by measuring the pipe length from the transmission time of the pipe.
本発明の第２の解決手段は、上記＠ｌの解決手段と実質
的に同じであるが、更に管路内に中空パイプを引き通し
、超音波パルス信号をこの中空パイプ内に通すことを特
徴とする管路長測定方法を提供することにある。The second solution of the present invention is substantially the same as the solution @l above, but is further characterized in that a hollow pipe is passed through the conduit, and the ultrasonic pulse signal is passed through the hollow pipe. An object of the present invention is to provide a method for measuring pipe length.
（作用）
このように、超音波パルス信号の管路内の伝達時間とそ
の伝達速度とから管路の長さを測定するが、特に超音波
パルス信号の伝達速度は温度によって変化するので管路
内の温度分布を光ファイ八型温度センサによって検出し
、この管路内温度分布によって超音波パルス信号の伝達
速度を補正しているのて、管路長を正確に測定すること
かてきる。また、例えば、管路内に曲かりかあってその
曲かり部分に泥水等が溜っていると、超音波パルス信号
の伝達速度か変化するが、超音波パルス信号を管路内に
引き通した中空パイプに通すと、超音波パルス信号は泥
水等を通ることがないのて泥水等によって測定に悪影響
を与えることかなくなる。(Function) In this way, the length of the conduit is measured from the transmission time of the ultrasonic pulse signal in the conduit and its transmission speed. The temperature distribution within the tube is detected by an optical fiber 8 type temperature sensor, and the transmission speed of the ultrasonic pulse signal is corrected based on this temperature distribution within the tube, making it possible to accurately measure the length of the tube. Also, for example, if there is a bend in the pipe and muddy water accumulates around the bend, the transmission speed of the ultrasonic pulse signal will change, but the transmission speed of the ultrasonic pulse signal will change. When passed through a hollow pipe, the ultrasonic pulse signal does not pass through muddy water or the like, so that the measurement is not adversely affected by muddy water or the like.
（実施例）
本発明の実施例を図面を参照して詳細に説明すると、第
１図は本発明に係る管路長測定方法を実施する装置を系
統的に示し、この方法は。(Example) An example of the present invention will be described in detail with reference to the drawings. FIG. 1 systematically shows an apparatus for carrying out a pipe length measuring method according to the present invention.
基本的には、長さを測定すべき管路ｌＯ内の温度分布Ｔ
ｄを検出し、また管路１０の一端から管路１０内に向け
て発信した超音波パルス信号を管路１０の他端で受信し
てこの超音波パルス信号の伝達時間Ｔｔを検出し、超音
波パルス信号の伝達速度Ｖｔを温度分布Ｔｄで補正しつ
つ超音波パルス信号の伝達時間Ｔｔから管路長りを測定
することにある。Basically, the temperature distribution T in the pipe lO whose length is to be measured
d, and an ultrasonic pulse signal transmitted from one end of the pipe 10 into the pipe 10 is received at the other end of the pipe 10, and the transmission time Tt of this ultrasonic pulse signal is detected. The purpose of this method is to measure the pipe length from the transmission time Tt of the ultrasonic pulse signal while correcting the transmission speed Vt of the sonic pulse signal using the temperature distribution Td.
温度分布Ｔｄは、管路１０内に配置された光ファイ八型
温度センサ１２を含む温度測定システム１４によって検
出される。この光ファイバ型温度測定システム１４は、
管路１０内に引き通された光ファイバ型温度センサ１２
の一端から光パルスを入射し、光ファイバ中で発生する
ラマン散乱光強度を検出することにより温度情報を検出
し、また光パルスの入射後ラマン散乱光が検出されるま
での遅れ時間から距離情報を検出し、この温度情報と距
離情報とから管路ｌＯに沿った温度分布Ｔｄを測定する
ことができる公知の測定システムである。The temperature distribution Td is detected by a temperature measurement system 14 that includes a fiber-optic temperature sensor 12 located within the conduit 10. This optical fiber type temperature measurement system 14 is
Optical fiber type temperature sensor 12 passed through the pipe 10
Temperature information is detected by inputting a light pulse from one end of the optical fiber and detecting the intensity of the Raman scattered light generated in the optical fiber, and distance information is also obtained from the delay time from the input of the light pulse until the Raman scattered light is detected. This is a known measurement system that can detect the temperature information and measure the temperature distribution Td along the conduit lO from this temperature information and distance information.
第４図は、この光ファイバ型温度測定システム１４で検
出された温度分布Ｔｄの一例を示し、この温度分布Ｔｄ
の一部Ｐを拡大して示すと、第５図に示すように、温度
は階段状に変化していることか解る。FIG. 4 shows an example of the temperature distribution Td detected by this optical fiber type temperature measurement system 14.
When a part P is enlarged and shown in FIG. 5, it can be seen that the temperature changes stepwise.
超音波パルス信号の伝達時間Ｔｔは、管路ｌＯの一端に
配置された超音波パルス信号の送信器１６と管路ｌＯの
他端に配置された超音波パルス信号の受信器１８とを含
む信号処理回路２０によって測定される。信号処理回路
２０は、超音波パルス信号の送信器１６と超音波パルス
信号の受信器１８との同期をとる外に、受信器１８で受
信された信号を増幅し、検波して送信器１６から信号を
送信してから受信するまての伝達時間Ｔｔを計算する。The transmission time Tt of the ultrasonic pulse signal is a signal including an ultrasonic pulse signal transmitter 16 disposed at one end of the conduit lO and an ultrasonic pulse signal receiver 18 disposed at the other end of the conduit lO. Measured by processing circuit 20. In addition to synchronizing the ultrasonic pulse signal transmitter 16 and the ultrasonic pulse signal receiver 18, the signal processing circuit 20 amplifies and detects the signal received by the receiver 18 and outputs the signal from the transmitter 16. The transmission time Tt from when a signal is transmitted to when it is received is calculated.
尚、超音波パルス信号の減衰をなくすために、ｔｓ１図
に示すように、送信器１６及び受信器１８のセンサ１６
ａ及び１８ａは管路ｌＯに対して密封手段２８によって
密封するのが好ましい。In addition, in order to eliminate attenuation of the ultrasonic pulse signal, the sensor 16 of the transmitter 16 and receiver 18 is
Preferably, a and 18a are sealed to the conduit lO by sealing means 28.
判定回路２２は、このようにして計算された伝達時間Ｔ
ｔと温度分布Ｔｄと超音波パルス信号の伝達速度Ｖｔと
を入力し、既にのべたように超音波パルス信号の伝達速
度Ｖｔを温度分布Ｔｄて補正し、異なる補正伝達速度ご
とに細分し、この細分された距離ごとに補正伝達速度と
それに相応する超音波パルス信号の伝達時間とから各細
分ごとの距離を求め、これらを集計して全体の管路長り
を測定する。指示器２４は、このようにして求められた
管路長りを適宜の方法で指示する。The determination circuit 22 determines the transmission time T calculated in this way.
t, the temperature distribution Td, and the transmission speed Vt of the ultrasonic pulse signal, correct the transmission speed Vt of the ultrasonic pulse signal using the temperature distribution Td as described above, subdivide it into different corrected transmission speeds, and The distance for each subdivision is determined from the corrected transmission speed and the corresponding transmission time of the ultrasonic pulse signal for each subdivision, and these are totaled to measure the total pipe length. The indicator 24 indicates the pipe length determined in this way by an appropriate method.
尚、第１図及び第２図において符号２６は信号処理回路
２０と判定回路２２と指示器２４とを含む測定装置全体
を示す。In FIGS. 1 and 2, reference numeral 26 indicates the entire measuring device including the signal processing circuit 20, the determination circuit 22, and the indicator 24.
本発明の具体例において、例えば、３００〜４００ｍの
長い管路を測定する場合に、超音波パルス信号としては
搬送周波数が２５ｋＨｚのものか用いられる。超音波パ
ルス信号の伝達速度Ｖｔは管路内温度の変化Δ１（０℃
に対する温度変化）によって次の通り変化する。In a specific example of the present invention, for example, when measuring a long pipeline of 300 to 400 m, a carrier frequency of 25 kHz is used as the ultrasonic pulse signal. The transmission speed Vt of the ultrasonic pulse signal is determined by the change in temperature inside the pipe Δ1 (0°C
It changes as follows depending on the temperature change).
Ｖｔ＝３３１．５（■／ｓｅｃ、）＋ ０．６（ｍ／ｓ
ｅｃ、）ｘΔを従って、管路ｌＯの温度が第６図に示す
ような温度分布で変化するとすると、判定回路２２は、
次の式で示すようにして管路長りを計算する。尚、この
式ででは管路内を伝達する補正前の超音波パルス信号の
伝達時間、Ｌ、、Ｌ、、Ｌｆｆ−−−一−は、第６図に
示すように管路内温度Ｔか変化する位置を順次示し、ま
たＴｒ、Ｔ２ 、 Ｔ３−−−−−は位置Ｌ＋ 、Ｌｍ
、Ｌ３て変化する前の管路内温度をそれぞれ示し、更
にＬｍ３はり、＋Ｌ、＋Ｌ、を示し、Ｌゎは管路端から
温度測定点までの距離である。Vt=331.5(■/sec, )+0.6(m/s
ec,)
Calculate the pipe length as shown in the following formula. In this equation, the transmission time of the ultrasonic pulse signal before correction, L, , L, , Lff, which is transmitted inside the pipe, is determined by the temperature T in the pipe as shown in FIG. The changing positions are shown sequentially, and Tr, T2, T3---- are the positions L+, Lm
, L3 indicate the temperature inside the pipe before changing, and Lm3, +L, +L, respectively, and Lゎ is the distance from the end of the pipe to the temperature measurement point.
Ｌ＝τ（Ｌ、／Ｌ、り（３３１，５÷ ０．６丁□）
◆τ（Ｌ２／Ｌ＋＋）（３３１，５◆０．６Ｔ＊）◆τ
（Ｌ＋／Ｌ＋３）（：１３１．ｓ ◆０．６Ｔ、）＝（
τ／Ｌｘ３） ΣＬ、 （３３１，５十〇、ｌ１Ｔｎ
）但しΣＬＩ、−Ｌ、３である。L = τ (L, /L, ri (331,5 ÷ 0.6 tons □)
◆τ(L2/L++)(331,5◆0.6T*)◆τ
(L+/L+3)(:131.s ◆0.6T,)=(
τ/Lx3) ΣL, (331,500, l1Tn
) However, ΣLI, -L, 3.
次に、第３図は本発明の他の実施例を示し、この実施例
では管路ｌＯにＵ字形の曲がり部分１０ａかあってこの
曲がり部分１０ａに泥水等が溜っている場合に管路ｌＯ
内にこの管路の内径よりも小さな外径の中空パイプ３０
を先端から水が入らないように密封した状態で引き通し
、その後この中空パイプ３０の両端に送信器１６及び受
信器１８を密封して取付け、前の実施例と同様にして測
定する。このようにすると。Next, FIG. 3 shows another embodiment of the present invention. In this embodiment, the pipe lO has a U-shaped bent part 10a, and when muddy water or the like is accumulated in this bent part 10a, the pipe lO
A hollow pipe 30 with an outer diameter smaller than the inner diameter of this conduit
The hollow pipe 30 is passed through in a sealed state to prevent water from entering from the tip, and then the transmitter 16 and the receiver 18 are attached to both ends of the hollow pipe 30 in a sealed manner, and measurements are made in the same manner as in the previous example. If you do it like this.
超音波パルス信号が泥水に触れることがなく、従って超
音波パルス信号が水によって反射されたり一部入射した
りして泥水による影響を受けることなく、管路長りを測
定することができる。尚、中空パイプ３０は金属または
非金属のいずれでもよいか、可撓性を持たせるために非
金属製であるのが好ましい。The ultrasonic pulse signal does not come into contact with muddy water, and therefore the pipe length can be measured without being affected by the muddy water due to the ultrasound pulse signal being reflected by water or partially incident on the water. Note that the hollow pipe 30 may be made of metal or non-metal, and is preferably made of non-metal in order to have flexibility.
（発明の効果）
本発明によれば、上記のように、超音波パルス信号の管
路内の伝達時間を検出し、また超音波パルス信号の伝達
速度は管路内温度分布によって補正し、この補正された
伝達速度と伝達時間とから管路長を正確に測定すること
ができ、従って管路内に布設すべき布設物を長めに製造
する必要がなく経済的であり、また超音波パルス信号を
管路内に引き通した中空パイプに通して測定すると、管
路内に泥水等があってもこの泥水等によって影響を受け
ることがなく管路を精度よく測定することができる実益
がある。(Effects of the Invention) According to the present invention, as described above, the transmission time of the ultrasonic pulse signal in the conduit is detected, and the transmission speed of the ultrasonic pulse signal is corrected based on the temperature distribution in the conduit. The length of the pipe can be accurately measured from the corrected transmission speed and transmission time, which is economical since there is no need to manufacture long structures to be installed in the pipe, and the ultrasonic pulse signal When measured through a hollow pipe drawn into the pipe, there is a practical benefit in that even if there is muddy water in the pipe, the pipe is not affected by the muddy water, etc., and the pipe can be measured accurately.
第１図は本発明に係る管路長測定方法を実施する装置の
概略系統図、第２図は第１図の装置の詳細な系統図、第
３図は本発明の他の実施例の要部の断面図、第４図及び
第５図は管路内温度分布を示す線図及びその一部の拡大
図、第６図は管路内温度の変化する状態の一部を一層拡
大して示す線図である。FIG. 1 is a schematic system diagram of an apparatus for implementing the pipe length measuring method according to the present invention, FIG. 2 is a detailed system diagram of the apparatus shown in FIG. 1, and FIG. 3 is a summary of another embodiment of the present invention. Figures 4 and 5 are diagrams showing the temperature distribution inside the pipe and an enlarged view of a part thereof, and Figure 6 is a further enlarged view of a part of the state where the temperature inside the pipe changes. FIG.
Claims (2)
によって管路内温度分布を検出し、また前記管路の一端
から管路内に向けて発信した超音波パルス信号を管路の
他端で受信して前記超音波パルス信号の伝達時間を検出
し、前記超音波パルス信号の伝達速度を前記温度分布で
補正しつつ前記伝達時間から管路長を測定することを特
徴とする管路長測定方法。(1) The temperature distribution inside the pipe is detected by an optical fiber distribution type temperature sensor placed inside the pipe, and an ultrasonic pulse signal transmitted from one end of the pipe into the pipe is transmitted to the other end of the pipe. A conduit characterized in that the transmission time of the ultrasonic pulse signal is detected by receiving the ultrasonic pulse signal at the end thereof, and the length of the conduit is measured from the transmission time while correcting the transmission speed of the ultrasonic pulse signal using the temperature distribution. How to measure length.
波パルス信号を前記中空パイプ内に通すことを特徴とす
る請求項第１項に記載の管路長測定方法。(2) The pipe length measuring method according to claim 1, characterized in that a hollow pipe is passed through the pipe line, and the ultrasonic pulse signal is passed through the hollow pipe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16283190A JPH0454410A (en) | 1990-06-22 | 1990-06-22 | Conduit length measuring method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16283190A JPH0454410A (en) | 1990-06-22 | 1990-06-22 | Conduit length measuring method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0454410A true JPH0454410A (en) | 1992-02-21 |
Family
ID=15762073
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP16283190A Pending JPH0454410A (en) | 1990-06-22 | 1990-06-22 | Conduit length measuring method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0454410A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08189823A (en) * | 1995-01-06 | 1996-07-23 | Nanno Kensetsu Kk | Distance measuring apparatus for tunnel by sound wave |
-
1990
- 1990-06-22 JP JP16283190A patent/JPH0454410A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08189823A (en) * | 1995-01-06 | 1996-07-23 | Nanno Kensetsu Kk | Distance measuring apparatus for tunnel by sound wave |
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