JP2002340522A - Displacement measuring method using optical fiber sensor - Google Patents

Displacement measuring method using optical fiber sensor

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Publication number
JP2002340522A
JP2002340522A JP2001142112A JP2001142112A JP2002340522A JP 2002340522 A JP2002340522 A JP 2002340522A JP 2001142112 A JP2001142112 A JP 2001142112A JP 2001142112 A JP2001142112 A JP 2001142112A JP 2002340522 A JP2002340522 A JP 2002340522A
Authority
JP
Japan
Prior art keywords
displacement
optical fiber
pipe
length direction
rotation angle
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
Application number
JP2001142112A
Other languages
Japanese (ja)
Other versions
JP4660805B2 (en
Inventor
Hitoshi Kumagai
仁志 熊谷
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Shimizu Construction Co Ltd
Shimizu Corp
Original Assignee
Shimizu Construction Co Ltd
Shimizu Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Shimizu Construction Co Ltd, Shimizu Corp filed Critical Shimizu Construction Co Ltd
Priority to JP2001142112A priority Critical patent/JP4660805B2/en
Publication of JP2002340522A publication Critical patent/JP2002340522A/en
Application granted granted Critical
Publication of JP4660805B2 publication Critical patent/JP4660805B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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Abstract

PROBLEM TO BE SOLVED: To reduce effects due to measurement errors for obtaining proper displacement in calculating displacement from the quantity of strain continuously measured along the length wise direction of an optical fiber and having the possibility containing the measurement errors. SOLUTION: In the displacement measuring method, a plurality of optical fiber sensors 2 are provided to a pipe 3, so that the mutual juxtaposed interval between the sensors become constant along the length direction of the pipe 3 and the pipe 3 is arranged in the ground, and the displacement with respect to a measurement start point (a) at an arbitrary position in the range from the measurement start point (a) to the terminal (b) along the length direction of the pipe 3 is calculated by integrating the quantity of strain continuously obtained from the start point (a) to the arbitrary position along the length direction from the respective optical fiber sensors 2. A clinometer 7 is provided at one place of the pipe 3 or a plurality of places over the length direction of the pipe 3 and the angle of rotation obtained, by integrating the quantity of strain is corrected on the basis of the angle of rotation measured by the clinometer 7, and the corrected angle of rotation is integrated to calculate the displacement.

Description

【発明の詳細な説明】DETAILED DESCRIPTION OF THE INVENTION

【0001】[0001]

【発明の属する技術分野】本発明は光ファイバセンサを
用いた変位測定方法に関するものである。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a displacement measuring method using an optical fiber sensor.

【0002】[0002]

【発明が解決しようとする課題】従来からトンネル掘削
工事や盛土工事などにおいて地盤変位を測定するには、
水管式沈下計や傾斜計を用いて変位を得るようにしてい
る。しかしながら、前者は管内の水位を利用するもので
鉛直方向での変位しか測定できないものである。また、
後者の傾斜計を用いて変位測定をする場合についても、
一般的には水平、鉛直のどちらかの方向での変位しか測
定できず、また、人為的に選択された複数の不連続位置
で測定された傾斜角、即ち、離散的に測定された傾斜角
を積分して変位に換算することとなり、測定誤差を大き
くするという問題があった。
Conventionally, to measure ground displacement in tunnel excavation work or embankment work, etc.
Displacement is obtained using a water tube sinker or inclinometer. However, the former uses the water level in the pipe and can only measure displacement in the vertical direction. Also,
When measuring displacement using the latter inclinometer,
Generally, only horizontal or vertical displacement can be measured, and tilt angles measured at a plurality of artificially selected discontinuous positions, that is, tilt angles measured discretely. Is integrated and converted into displacement, which causes a problem of increasing the measurement error.

【0003】このような問題から光ファイバをセンサと
して変位を測定する試みが行われている。これは、光フ
ァイバにおいて、光を入射し、その光の一部が散乱され
ると、散乱光として入射端に戻ってくる特質を利用した
ものであって、この散乱光の強度の変化を調べることで
光ファイバの曲がりを求めることができ、周波数分布を
解析することによって歪みなどを求めることができる。
また入射から散乱光が戻ってくるまでの時間から光ファ
イバの計測位置を決定できる。このような特質を有する
光ファイバを光ファイバセンサとし、光ファイバセンサ
の片側から光ファイバセンサ全体に亘っての歪みや損失
およびその位置を測定することで、光ファイバセンサが
位置している外的状況(例えば、光ファイバセンサが埋
設されている場合の地盤変位)を測定できるようにする
ことが試みられていた。しかしながら、この測定方法で
用いるパイプが長くなると歪み量の計測誤差が生じる可
能性があり、その計測誤差を含んだ歪み量から算出した
値を補正しないまま変位を算出してしまうと、得られた
変位が実際の変位と大きくかけ離れるという問題があ
る。そこで本発明は上記事情に鑑み、光ファイバの長さ
方向に沿って連続的に計測され、かつ計測誤差を含んで
いる可能性のある歪み量から上記変位を算出するに際し
て、その計測誤差による影響を少なくすることを課題と
し、適正な変位が得られるようにすることを目的とする
ものである。
[0003] From such a problem, attempts have been made to measure displacement using an optical fiber as a sensor. This utilizes the characteristic that when light is incident on an optical fiber and a part of the light is scattered, it returns to the incident end as scattered light, and the change in the intensity of this scattered light is examined. Thus, the bending of the optical fiber can be obtained, and distortion or the like can be obtained by analyzing the frequency distribution.
Further, the measurement position of the optical fiber can be determined from the time from the incident to the return of the scattered light. An optical fiber having such characteristics is used as an optical fiber sensor, and by measuring distortion and loss and its position from one side of the optical fiber sensor to the entire optical fiber sensor, an external fiber where the optical fiber sensor is located is measured. Attempts have been made to be able to measure conditions (eg, ground displacement when an optical fiber sensor is embedded). However, if the length of the pipe used in this measurement method is long, there is a possibility that a measurement error of the strain amount may occur, and if the displacement is calculated without correcting the value calculated from the strain amount including the measurement error, it is obtained. There is a problem that the displacement is far from the actual displacement. In view of the above circumstances, the present invention considers the influence of a measurement error when calculating the displacement from the amount of distortion that is continuously measured along the length direction of the optical fiber and may include a measurement error. It is an object of the present invention to reduce the distance, and to obtain an appropriate displacement.

【0004】[0004]

【課題を解決するための手段】本発明は上記課題を考慮
してなされたもので、それぞれが光ファイバからなる複
数本の光ファイバセンサを、該光ファイバセンサ相互の
並設間隔が光ファイバセンサの長さ方向に沿って一定に
なるようにしてパイプに設けて、該パイプを地中に設置
し、前記パイプの長さ方向に沿った測定起点から終点に
おける任意位置での前記起点に対する変位を、前記光フ
ァイバセンサそれぞれから長さ方向に沿って前記起点か
ら前記任意位置まで連続して得られる歪み量を積分して
算出する変位測定方法であって、前記パイプの一箇所ま
たはパイプの長さ方向に亘る複数箇所に傾斜計を設け、
前記歪み量を積分して得られる回転角を、前記傾斜計が
測定した回転角に基づいて補正し、補正された回転角を
積分して変位を算出することを特徴とする光ファイバセ
ンサを用いた変位測定方法を提供して、上記課題を解消
するものである。そして、本発明において、上記光ファ
イバセンサの上記起点と終点との変位を測量により測定
し、上記補正された回転角を積分して得られる変位を、
前記測量により得られた起点と終点との変位に基づいて
補正することが良好である。
SUMMARY OF THE INVENTION The present invention has been made in consideration of the above problems, and comprises a plurality of optical fiber sensors each comprising an optical fiber; Provided on the pipe so as to be constant along the length direction of the pipe, the pipe is installed in the ground, the displacement from the measurement start point along the length direction of the pipe with respect to the start point at any position at the end point. A displacement measuring method for integrating and calculating a strain amount continuously obtained from the starting point to the arbitrary position along the length direction from each of the optical fiber sensors, wherein the pipe is located at one position or the pipe length. Provide inclinometers at multiple locations across the direction,
A rotation angle obtained by integrating the distortion amount is corrected based on the rotation angle measured by the inclinometer, and a displacement is calculated by integrating the corrected rotation angle. The object of the present invention is to solve the above-mentioned problem by providing a displacement measuring method. Then, in the present invention, the displacement between the start point and the end point of the optical fiber sensor is measured by surveying, and the displacement obtained by integrating the corrected rotation angle is:
It is preferable to make correction based on the displacement between the start point and the end point obtained by the survey.

【0005】[0005]

【発明の実施の形態】つぎに本発明に係る実施の形態に
基づいて詳細に説明する。図中1は長尺なセンサ装置
で、図1にはその一部分において構成部材がその断面位
置を異ならせて斜視状態にして示されている。前記セン
サ装置1の構成部材は光ファイバからなる四本の光ファ
イバセンサ2とプラスチック製または繊維強化プラスチ
ック製のパイプ3であり、前記光ファイバセンサ2それ
ぞれはパイプ3の板厚4内に埋め込まれた状態にしてそ
のパイプ3の長さ方向に亘って設けられている。
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, a detailed description will be given based on an embodiment according to the present invention. In FIG. 1, reference numeral 1 denotes a long sensor device, and FIG. 1 shows a part of the component member in a perspective state with its cross-sectional position being different. The constituent members of the sensor device 1 are four optical fiber sensors 2 composed of optical fibers and a pipe 3 made of plastic or fiber reinforced plastic. Each of the optical fiber sensors 2 is embedded in a plate thickness 4 of the pipe 3. It is provided over the length direction of the pipe 3 in an upright state.

【0006】パイプ3の断面方向において光ファイバセ
ンサ2それぞれの位置は、該光ファイバセンサ2の長さ
方向Aと直交する平面上で描くことのできる正四角形B
の頂点B1,B2,B3,B4となるようにしており、
図上、上下位置で対向位置する二本の光ファイバセンサ
2が頂点B1,B3を通り、図上、左右位置で対向する
二本の光ファイバセンサ2が頂点B2,B4を通ってい
る。そして、光ファイバセンサ2相互の並設間隔D1、
D2、D3、D4それぞれが光ファイバセンサ2の長さ
方向Aに沿って一定になり、パイプ3の長さ方向に沿っ
て光ファイバセンサ2の位置が周方向にずれることな
く、即ち、パイプ3の長さ方向と光ファイバセンサ2の
長さ方向とを平行にしている。また、センサ装置1にお
ける上記パイプ3にはその長さ方向に亘ってセンサ装置
自体の断面方向での向きを表現する指示手段5が設けら
れていて、この指示手段5はマーキングや凹凸によって
形成されている。さらに、この指示手段5は一つの光フ
ァイバセンサ2に近接するように設けられている。な
お、光ファイバセンサ2をパイプ3の板厚4内に埋め込
んだものを示したが、これは光ファイバセンサ2相互の
間隔を保つ方法の一つであり、相互の間隔を保つという
条件のもとでパイプ3の外表面に配置してもよく、さら
に後述する傾斜計との干渉を避けることが可能であれ
ば、パイプ3の内周面に光ファイバセンサ2を配置する
ようにしてもよい。
The position of each optical fiber sensor 2 in the sectional direction of the pipe 3 is defined by a regular square B which can be drawn on a plane orthogonal to the length direction A of the optical fiber sensor 2.
Vertices B1, B2, B3, B4 of
In the figure, two optical fiber sensors 2 facing each other at upper and lower positions pass through vertices B1 and B3, and two optical fiber sensors 2 facing each other at right and left positions pass through vertices B2 and B4. Then, the parallel spacing D1 between the optical fiber sensors 2;
Each of D2, D3, and D4 becomes constant along the length direction A of the optical fiber sensor 2, and the position of the optical fiber sensor 2 does not shift in the circumferential direction along the length direction of the pipe 3, that is, the pipe 3 Is made parallel to the length direction of the optical fiber sensor 2. In addition, the pipe 3 of the sensor device 1 is provided with an indicating means 5 for expressing the direction of the sensor device itself in a cross-sectional direction over its length direction, and the indicating means 5 is formed by marking or unevenness. ing. Further, the indicating means 5 is provided so as to approach one optical fiber sensor 2. Although the optical fiber sensor 2 is shown as being embedded in the plate thickness 4 of the pipe 3, this is one of the methods for maintaining the interval between the optical fiber sensors 2, and the condition for maintaining the interval between them is also satisfied. The optical fiber sensor 2 may be arranged on the inner peripheral surface of the pipe 3 if it is possible to avoid interference with an inclinometer described later. .

【0007】上記構造のセンサ装置1は地中に設置する
ことができるものであり、掘り下げた地盤にこのセンサ
装置1を敷設してから埋め戻しを行なったり、ボーリン
グ孔内に固定させるなどして地中に設置する。そして、
このようにして地中に位置することになるセンサ装置1
に図示しない散乱光検出手段を接続し、上記各光ファイ
バセンサ2に所要の光を入射させ散乱光を受け取り、光
ファイバの特性によってこの散乱光から得られる光ファ
イバセンサ2の歪み量からパイプ3の測定の起点から終
点までの長さ方向に沿った任意位置での前記起点に対す
る三次元的な変位を算出し、これによってセンサ装置1
を位置させた地中の変位を測定する。例えば、図2は上
記センサ装置1を横方向にして敷設した例であって、ト
ンネル掘削6に際してのトンネル周辺地盤変位の測定の
例を示しており、センサ装置1が通る地中の一部に力F
が加わってその地中の一部分が変位すれば、後述する変
位測定方法によりその三次元的な変位量を測定できる。
また、図3はセンサ装置1を上下方向に敷設した例であ
って、斜面の変位及び滑り位置の測定の例を示してい
て、力Fが加わって地中の一部が変位したことを、後述
の変位測定方法により三次元的に測定できる。
The sensor device 1 having the above structure can be installed underground. The sensor device 1 is laid on a dug ground and then back-filled or fixed in a borehole. Install underground. And
Sensor device 1 to be located underground in this way
And scattered light detecting means (not shown) are connected to the optical fiber sensors 2 so that required light is incident on the optical fiber sensors 2 to receive the scattered light. Calculates a three-dimensional displacement with respect to the start point at an arbitrary position along the length direction from the start point to the end point of the measurement, and thereby the sensor device 1
The displacement in the ground where is located is measured. For example, FIG. 2 shows an example in which the sensor device 1 is laid in a horizontal direction, and shows an example of measurement of ground displacement around the tunnel at the time of tunnel excavation 6. Force F
When a part of the ground is displaced due to the addition of, the three-dimensional displacement can be measured by a displacement measuring method described later.
FIG. 3 shows an example in which the sensor device 1 is laid in the up-down direction, and shows an example of measurement of displacement of a slope and a slip position. It can be measured three-dimensionally by a displacement measurement method described later.

【0008】上記実施の例におけるセンサ装置1におい
て、各光ファイバセンサ2それぞれから、光ファイバの
特質を利用して測定の起点から終点での長さ方向Aに沿
っての歪み量が連続して得られる(長さ方向に沿った歪
み分布として得られる)。さらにセンサ装置1にあって
は、図4に示されているようにパイプ3の内部に傾斜計
7が位置していて、この傾斜計7はパイプ3の長さ方向
に亘る複数箇所に設置固定されており、傾斜計7におい
て測定された回転角の情報が信号線8により上述した散
乱光検出手段などを備える計測機器へと出力されるよう
にしている。つぎに、便宜上、図1と図4で示したセン
サ装置1を地中に横にして敷設したものと想定し、この
状態に基づいて、上下に相対する二本の光ファイバセン
サ2のそれぞれの歪み量から上下方向での回転角と変位
をつぎのようにして求める。まず、傾斜計7が位置する
箇所において上下の光ファイバセンサ2から歪み量
εx1、εx2として得られるから、回転角θxを図4に示
す積分式により積分し、その値における積分定数を、傾
斜計7にて測定された回転角の値を用いて除去する。な
お、上下の光ファイバセンサ2の間隔はdである。
In the sensor device 1 according to the above embodiment, the amount of strain in the length direction A from the starting point to the ending point of the measurement is continuously measured from each of the optical fiber sensors 2 by utilizing the characteristics of the optical fiber. (Obtained as a strain distribution along the length direction). Further, in the sensor device 1, as shown in FIG. 4, the inclinometer 7 is located inside the pipe 3, and the inclinometer 7 is installed and fixed at a plurality of locations along the length direction of the pipe 3. The information on the rotation angle measured by the inclinometer 7 is output to a measuring device including the above-described scattered light detecting means via a signal line 8. Next, for convenience, it is assumed that the sensor device 1 shown in FIGS. 1 and 4 is laid horizontally in the ground, and based on this state, each of the two optical fiber sensors 2 opposed to each other in the vertical direction. The rotation angle and displacement in the vertical direction are obtained from the amount of distortion as follows. First, since the strain amounts ε x1 and ε x2 are obtained from the upper and lower optical fiber sensors 2 at the position where the inclinometer 7 is located, the rotation angle θx is integrated by the integration formula shown in FIG. Removal is performed using the value of the rotation angle measured by the inclinometer 7. The distance between the upper and lower optical fiber sensors 2 is d.

【0009】つぎに、変位(上下方向)の算出に際して
は、このセンサ装置1における測定の起点aと終点bと
の位置を既存の測量方法によって測定しておく。そし
て、上記補正された回転角θxを図4に示す積分式で積
分して変位δxを算出し、積分により得られた値の積分
定数を、前記起点aと終点bとの変位の測量値を用いて
除去する。なお、lは光ファイバセンサ2の全長(起点
aと終点bの距離)である。同様に横方向においての変
位を求める場合には、図1に示す断面での左右に相対す
る二本の光ファイバセンサ2を用いて測定される歪み量
を積分するとともに、上述した傾斜計7での横方向での
傾斜角の値を用いて積分定数を除去して、補正された回
転角を得るようにする。そして、回転角を全長の下で積
分して、その積分定数を起点aと終点bとの変位の測量
値に用いて除去することで、補正された変位(横方向)
を得ることができる。このようにすることで変位は補正
された状態で得ることができ、適正にセンサ装置1を配
設した外的状況、即ち、地盤変位を測定できるものとな
る。なお、本発明において、上記傾斜計での計測手法な
どは特に限定されるものではなく、光ファイバセンサに
よるものであっても電気式のものであってもよい。
Next, when calculating the displacement (vertical direction), the positions of the starting point a and the ending point b of measurement in the sensor device 1 are measured by an existing surveying method. Then, the corrected rotation angle θ x is integrated by an integration equation shown in FIG. 4 to calculate a displacement δ x, and an integration constant of a value obtained by the integration is measured for the displacement between the start point a and the end point b. Remove with value. Here, 1 is the total length of the optical fiber sensor 2 (the distance between the start point a and the end point b). Similarly, when the displacement in the lateral direction is obtained, the amount of strain measured by using the two optical fiber sensors 2 facing left and right in the cross section shown in FIG. Is used to remove the integration constant to obtain a corrected rotation angle. Then, the rotation angle is integrated over the entire length, and the integration constant is removed by using the integration constant as a measured value of the displacement between the start point a and the end point b to remove the corrected displacement (lateral direction).
Can be obtained. In this manner, the displacement can be obtained in a corrected state, and the external situation in which the sensor device 1 is properly disposed, that is, the ground displacement can be measured. In the present invention, the measuring method using the inclinometer is not particularly limited, and may be an optical fiber sensor or an electric type.

【0010】つぎに全長lを10mとしたセンサ装置1
を地盤中に設置して一方向(例えば上下方向)の変位を
測定する事例を検証した。センサ装置1における起点と
終点とは既存の測量方法によって変位0であり、かつ、
全長に亘っての変位も0であることが得られているとす
る。なお、パイプ径dは50mmである。そして、図5
に示すように、一方の片側1mのパイプ上側の光ファイ
バセンサに歪み(歪み量)0.01%として計測され、
これが計測誤差で生じたとする。
Next, a sensor device 1 having a total length l of 10 m
Was installed in the ground to measure the displacement in one direction (for example, vertical direction). The starting point and the ending point in the sensor device 1 have a displacement of 0 according to the existing surveying method, and
It is assumed that the displacement over the entire length has been obtained to be zero. The pipe diameter d is 50 mm. And FIG.
As shown in the figure, the strain (strain amount) is measured as 0.01% by the optical fiber sensor on the upper side of the pipe on one side 1 m,
It is assumed that this occurs due to a measurement error.

【0011】これを基に変位を測定しようとすると、回
転角の分布は、図6に示す回転角補正無Gで示される状
態に算出されてしまう。ここで、5mの位置で傾斜計が
設置されていたとし、その傾斜計からは回転角の値が0
として計測されるから、上述した方法で補正すること
で、回転角補正有Hの状態として回転角の分布が得られ
ることになる。
If the displacement is measured on the basis of this, the distribution of the rotation angle is calculated to the state shown by the rotation angle correction G shown in FIG. Here, it is assumed that the inclinometer is installed at a position of 5 m, and the value of the rotation angle is 0 from the inclinometer.
Therefore, by performing the correction in the above-described manner, the distribution of the rotation angle is obtained as the state with the rotation angle correction H.

【0012】そして、上述した回転角補正無Gの回転角
分布と回転角補正有Hの回転角分布それぞれの状態から
変位を算出すれば、図7に示すように回転角補正無Gの
状態からの変位では最大で0.8mmの変位が発生し、
全体的に変位している状態を示す結果となるが、回転角
補正有Hの状態からの変位は、片側1mの範囲のみで最
大0.3mmの変位が発生しているものとなり、計測誤
差による影響が軽減された適正な変位が測定されたこと
が判断できる。
When the displacement is calculated from the respective states of the rotation angle distribution without rotation angle correction G and the rotation angle distribution with rotation angle correction H, as shown in FIG. With a displacement of 0.8 mm, a maximum displacement of 0.8 mm occurs.
Although the result shows the state of displacement as a whole, the displacement from the state with the rotation angle correction H is a displacement of up to 0.3 mm only in the range of 1 m on one side, which is due to a measurement error. It can be determined that an appropriate displacement with reduced influence has been measured.

【0013】[0013]

【発明の効果】以上説明した本発明の光センサファイバ
を用いた変位測定方法によれば、光ファイバセンサの歪
み量を積分して得られる回転角の値に対して、傾斜計に
よって直接計測された回転角の値を利用して補正を行な
うため、計測誤差からの影響を極力抑えた状態にして回
転角から変位を算出できるようになり、光ファイバセン
サが設置されている部分での変位を適正に測定できるな
ど、実用性に優れた効果を奏するものである。
According to the displacement measuring method using the optical sensor fiber of the present invention described above, the value of the rotation angle obtained by integrating the distortion amount of the optical fiber sensor is directly measured by the inclinometer. Since the correction is performed using the value of the rotation angle, the displacement can be calculated from the rotation angle while minimizing the influence from the measurement error, and the displacement at the part where the optical fiber sensor is installed can be calculated. It has an effect that is excellent in practicality, such as being able to measure properly.

【図面の簡単な説明】[Brief description of the drawings]

【図1】本発明に係る光ファイバセンサを用いた変位測
定方法における光ファイバセンサの一例を示す説明図で
ある。
FIG. 1 is an explanatory diagram showing an example of an optical fiber sensor in a displacement measuring method using an optical fiber sensor according to the present invention.

【図2】光ファイバセンサを横にして敷設した地中が変
位した状態を示す説明図である。
FIG. 2 is an explanatory view showing a state in which the underground where the optical fiber sensor is laid down is displaced.

【図3】光ファイバセンサを縦にして敷設した地中が変
位した状態を示す説明図である。
FIG. 3 is an explanatory diagram showing a state in which the underground where an optical fiber sensor is laid vertically is displaced.

【図4】二本の光ファイバセンサによる歪み量から変位
を算出する例を示す説明図である。
FIG. 4 is an explanatory diagram showing an example of calculating a displacement from the amount of distortion by two optical fiber sensors.

【図5】センサ装置における歪みの誤差分布をグラフで
示す説明図である。
FIG. 5 is an explanatory diagram illustrating a distortion error distribution in the sensor device in a graph.

【図6】回転角補正無と回転角補正有の場合の回転角の
分布をグラフで示す説明図である。
FIG. 6 is an explanatory diagram showing distributions of rotation angles in a case where the rotation angle is not corrected and a case where the rotation angle is corrected;

【図7】回転角補正無と回転角補正有の場合の変位の分
布をグラフで示す説明図である。
FIG. 7 is an explanatory diagram showing a graph of a distribution of displacement in a case where there is no rotation angle correction and a case where there is rotation angle correction.

【符号の説明】[Explanation of symbols]

1…センサ装置 2…光ファイバセンサ 3…パイプ 7…傾斜計 DESCRIPTION OF SYMBOLS 1 ... Sensor device 2 ... Optical fiber sensor 3 ... Pipe 7 ... Inclinometer

Claims (2)

【特許請求の範囲】[Claims] 【請求項1】それぞれが光ファイバからなる複数本の光
ファイバセンサを、該光ファイバセンサ相互の並設間隔
が光ファイバセンサの長さ方向に沿って一定になるよう
にしてパイプに設けて、該パイプを地中に設置し、前記
パイプの長さ方向に沿った測定起点から終点における任
意位置での前記起点に対する変位を、前記光ファイバセ
ンサそれぞれから長さ方向に沿って前記起点から前記任
意位置まで連続して得られる歪み量を積分して算出する
変位測定方法であって、 前記パイプの一箇所またはパイプの長さ方向に亘る複数
箇所に傾斜計を設け、前記歪み量を積分して得られる回
転角を、前記傾斜計が測定した回転角に基づいて補正
し、補正された回転角を積分して変位を算出することを
特徴とする光ファイバセンサを用いた変位測定方法。
A plurality of optical fiber sensors, each comprising an optical fiber, are provided on a pipe such that the juxtaposed intervals between the optical fiber sensors are constant along the length direction of the optical fiber sensor. The pipe is installed in the ground, and the displacement from the measurement start point along the length direction of the pipe to the start point at an arbitrary point at the end point from the measurement start point along the length direction of the pipe from the start point along the length direction from each of the optical fiber sensors. A displacement measuring method for integrating and calculating a strain amount continuously obtained to a position, wherein an inclinometer is provided at one place of the pipe or at a plurality of places along a length direction of the pipe, and the strain amount is integrated. A displacement measurement method using an optical fiber sensor, wherein the obtained rotation angle is corrected based on the rotation angle measured by the inclinometer, and the corrected rotation angle is integrated to calculate a displacement. .
【請求項2】光ファイバセンサの上記起点と終点との変
位を測量により測定し、上記補正された回転角を積分し
て得られる変位を、前記測量により得られた起点と終点
との変位に基づいて補正する請求項1に記載の光ファイ
バセンサを用いた変位測定方法。
2. A displacement between the starting point and the end point of the optical fiber sensor is measured by surveying, and a displacement obtained by integrating the corrected rotation angle is converted into a displacement between the starting point and the end point obtained by the surveying. A displacement measurement method using the optical fiber sensor according to claim 1, wherein the displacement is measured based on the correction.
JP2001142112A 2001-05-11 2001-05-11 Displacement measurement method using optical fiber sensor Expired - Fee Related JP4660805B2 (en)

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CN110686612A (en) * 2019-10-31 2020-01-14 大连理工大学 Inclination measuring device and inclination measuring method based on shape sensor
CN110686612B (en) * 2019-10-31 2020-08-25 大连理工大学 Inclination measuring device and inclination measuring method based on shape sensor
CN115900579A (en) * 2023-01-06 2023-04-04 山东大学 Self-correcting splicing type optical fiber displacement field sensing system and correcting method thereof

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