JP2003042901A - Strain measurement monitoring system - Google Patents

Abstract

(57) [Problem] To provide a distortion measurement and monitoring system capable of centrally managing a plurality of BOTDRs from a remote place and quickly analyzing data. SOLUTION: According to a schedule created by a measurement scheduling unit 25, a measurement instruction unit 26
A measurement instruction is issued to BOTDR3 via the OTDR control PC2. The distortion amount information acquisition unit 21 acquires the distortion amount information obtained as a result. The temperature correction processing unit 22 performs a temperature correction process on the distortion amount information using the measurement data of the temperature correction measurement section while referring to the information in the section information storage unit 20. The distortion amount determination unit 23 determines whether the corrected distortion amount is within a normal range based on a threshold value stored in advance. If the amount of distortion is abnormal, the alarm output unit 24 outputs an alarm to a predetermined alarm output destination.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a strain measurement / monitoring system for monitoring a measurement result of a strain amount of a structure. In particular, the Brilloun (Brillo) of the optical fiber laid in the structure
uin) The present invention relates to a strain measurement monitoring system that monitors a measurement result by BOTDR that measures scattered light.

[0002]

2. Description of the Related Art For example, as a sensor for highly accurately observing the deformation of structures such as retaining walls constructed on slopes such as winding roads, dams, levee bodies, and cliffs, bridges, buildings, concrete, etc. Those using optical fibers have been receiving attention.

As a method for observing with high accuracy the continuous distribution of strain in the longitudinal direction of an optical fiber laid on a structure,
A method utilizing the fact that the frequency shift amount of Brillouin scattered light, which is one of the nonlinear phenomena, depends on the strain amount of the optical fiber has been developed. For example, an optical fiber such as an optical fiber strand, an optical fiber ribbon, an optical fiber cord, etc. is laid and extended along a structure, and by fixing a plurality of longitudinal positions of these optical fibers to the structure,
The deformation of the structure acts as elongation strain in the longitudinal direction of the optical fiber. Then, by observing the Brillouin scattered light of the return light of the incident light from one end of the optical fiber, the fluctuation of the elongation strain in the longitudinal direction of the optical fiber (the occurrence of the elongation strain in the longitudinal direction from the unstrained state, the elongation strain It is possible to detect the deformation of the structure because the increase, the reduction of the elongation strain originally given, etc. can be detected. The increase or decrease in the elongation strain amount can be detected by the change in the frequency shift amount of the Brillouin scattered light.

Then, in order to observe the amount of distortion of the optical fiber by using the above-mentioned method, an optical pulse tester for injecting an optical pulse into one end of the optical fiber and observing the returned light due to the optical pulse is used. BOTDR (Brillouin
A device called an optical time domain reflectometer) has been developed.

[0005]

However, the observation using BOTDR as described above also has the following problems. First, by using BOTDR, it is possible to know at which position of the optical fiber laid on the structure and how much the strain amount has changed. In order to find out which position of the object is caused by the deformation, it is necessary to sort and analyze the data one by one by comparing the data obtained from BOTDR with the information written in the ledger. It was troublesome and time consuming. In particular, when a disaster such as an earthquake or a torrential rain occurs, it is difficult to take swift action because the data analysis becomes a bottleneck, even though it is necessary to take measures for the deformed structure. there were.

Secondly, the variation in the amount of strain in the longitudinal direction of the optical fiber laid on the structure does not occur only by the deformation of the structure, but also includes a variation component due to other factors such as temperature change. ing. Therefore, in order to detect the deformation of the structure, it is necessary to correct the variation due to temperature with respect to the variation data of the strain amount of the optical fiber observed by BOTDR. Since such a temperature correction calculation is required, there is a problem that the data analysis takes more time.

Thirdly, it is necessary to install the BOTDR near the structure to be measured. Therefore, in order to manage many structures and accumulate data continuously, the person in charge of observation patrols the BOTDR distributed in a wide area, and operates the BOTDR at each place for observation. It is necessary to collect the acquired data, and it has been desired to improve the efficiency of such work.

The present invention has been made in consideration of the above circumstances, and it is possible to centrally manage a plurality of BOTDRs from a remote place and quickly analyze data, and to prevent disasters and other cases. It is an object of the present invention to provide a strain measurement / monitoring system capable of promptly responding to an abnormality in a structure due to the above reason.

[0009]

In order to solve the above-mentioned problems, the present invention provides a section information storage unit for pre-storing section information including start point position information and end point position information of a section on an optical fiber. And a strain amount information acquisition unit that acquires strain amount information for each position on the optical fiber measured by the optical fiber strain measuring device, and is included in the section based on the strain amount information acquired by the strain amount information acquisition unit. A gist of a strain measurement and monitoring system is characterized by including a strain amount at a position to be extracted, and a strain amount determination unit that determines whether or not the strain amount is within a normal range for each section.

Further, the strain measurement monitoring system of the present invention performs temperature correction processing based on the strain amount information of the measurement target section and the correction strain amount of the temperature correction measurement section acquired by the distortion amount information acquisition unit. A temperature correction processing unit is provided, and the distortion amount determination unit determines whether or not the distortion amount after the correction processing by the temperature correction processing unit is within a normal range. The temperature-correction measurement section is a section on the optical fiber where measurement is performed in order to extract the strain amount due to only the temperature change. The measurement section for temperature correction may be provided on the same optical fiber as the section to be corrected (structural strain non-interference point method), or on an optical fiber dedicated to temperature correction different from the section to be corrected. It may be provided (temperature correction fiber method).

Further, in the strain measurement monitoring system of the present invention, the section information storage unit stores the section information relating to both the temperature correction measurement section and the measurement target section provided on one optical fiber. It is characterized by being

Further, in the strain measurement / monitoring system of the present invention, the strain amount information acquisition unit acquires the strain amount information regarding a plurality of optical fibers, and the section information identifies an optical fiber. The optical fiber identification information is included, and the section information storage unit relates to both a temperature correction measurement section provided on an optical fiber dedicated to temperature correction and a measurement target section provided on another optical fiber. It is characterized in that the section information is stored.

Further, in the strain measuring and monitoring system of the present invention, the optical fiber measuring device inputs the measuring pulsed light to the optical fiber, and based on the reflected light component from the optical fiber, the optical fiber is measured. It is BOTDR which measures the amount of strain for each position above, and the strain measurement monitoring system is provided with a measurement instructing unit for instructing the measurement start by the optical fiber measuring instrument.

Further, in the strain measurement monitoring system of the present invention, the measurement instructing section instructs the optical fiber measuring instrument to start the measurement after instructing the optical fiber measuring instrument to emit the pulsed light a predetermined number of times for stabilizing the measurement. It is characterized by being performed.

Further, the strain measurement monitoring system of the present invention calculates the required measurement time for each optical fiber based on the preset measurement conditions, and measures the respective optical fibers based on the calculated required measurement time. A measurement scheduling unit that sets a start time, the measurement instructing unit is based on the measurement start time set by the measurement scheduling unit,
It is characterized in that an instruction to start measurement is given.

Further, the strain measurement monitoring method of the present invention uses a BOT.
A first process for instructing the DR to measure the strain amount, a second process for obtaining the strain amount information obtained as a result of this measurement instruction, and the strain using the measurement data regarding the temperature-correction measurement section. And a third step of performing temperature correction processing relating to quantity information.

Further, in the strain measurement / monitoring method of the present invention, the strain amount information can be obtained by comparing the strain amount information after the correction processing in the third step with a threshold value stored in a storage unit in advance. When the threshold value is exceeded, a fourth step of outputting an alarm to a preset alarm output destination is further included.

[0018]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a configuration diagram showing a configuration of the strain measurement monitoring system according to the same embodiment.

In this strain measurement / monitoring system, it is possible to operate a plurality of servers, and the configuration shown in FIG. 1 includes two servers, a server 1M (main) and a server 1S (sub). Has been. 2 is multiple BOTs
The BOTDR control PC 2 is a DR control PC (personal computer), controls the BOTDRs under its control, performs measurement according to an instruction from the server 1M or 1S, and returns data obtained as a result of the measurement to the instruction source server. Also, 3 is BOTDR, and this BOT
The DR3 observes the amount of strain at each continuous position in the longitudinal direction of the optical fiber by injecting an optical pulse into one end of the optical fiber and observing the returned light. It should be noted that one BOTDR control PC 2 has a plurality of BOs.
It is also possible to connect TDR3. Also, 4
Is an optical switch equipped with an optical circuit inside, and this optical switch 4 is based on a control signal from the BOTDR control PC 2 and has one optical fiber on the incoming side (BOTDR side),
It has a function of optically connecting to any of the plurality of measurement optical fibers on the output side. In the following, each of the outgoing optical fibers connected to the optical switch is called a "channel".

The server 1M or 1S transmits data for acquiring the control right to the BOTDR control PC 2 in advance before the measurement. This control right is exclusive, and the BOTDR control PC 2 is controlled only by the server having the control right for itself at that time,
The measurement data is sent only to that server.

Reference numeral 11 is a client, and the client 11 can refer to the data acquired by the servers 1M and 1S. Reference numeral 12 is a database server, and the storage device provided in the database server 12 can store measurement data and other data necessary for the strain measurement monitoring system. The data obtained as a result of the BOTDR measurement is automatically stored in the database and managed for each channel. The database server 12
Alternatively, the server 1M or 1S may be provided with a similar database management function and the above data may be stored in the storage device. Reference numeral 13 denotes a manager, which is capable of setting the entire system and monitoring the operating status. In addition, without providing the manager 13, the server 1M or 1
A similar management function may be provided in S.

Numeral 10 is a network through which the servers 1M and 1S and B are connected.
The OTDR control PC 2, the client 11, the database server 12, and the manager 13 can communicate with each other. In this embodiment, TCP
/ IP (Transmission Control Protocol /
The above-mentioned communication is performed using the Internet protocol), and this network 10 includes a LAN using Ethernet (registered trademark), an ISDN (integrated digital service network) line, and an ADSL (asymmetric digital subscriber line). ) Is configured using services and the like.

Next, the functional configuration inside the server will be described. FIG. 2 is a block diagram showing a functional configuration inside the server. As shown in FIG. 2, the server 1M includes a section information storage unit 20, a strain amount information acquisition unit 21, and a temperature correction processing unit 2.
2, a distortion amount determination unit 23, an alarm output unit 24, a measurement scheduling unit 25, a measurement instruction unit 26, and a communication unit 29.
It has and. The server 1S shown in FIG. 1 also has the same configuration as the server 1M.

The measurement instruction section 26 has a function of instructing the BOTDR to start measurement in order to perform measurement at an arbitrary timing. The instruction to start measurement can be issued manually or automatically according to a preset schedule. In the case of automatic execution, the measurement instruction unit 26 gives an instruction based on the schedule managed by the measurement scheduling unit 25. It should be noted that, for example, the schedule can be set in a daily measurement cycle (for example, “every day from 0:00”, “on Monday from 0:00”, etc.) or an hourly measurement cycle (“every hour from XX minutes”, etc.). .

The instruction information output from the measurement instruction unit 26 is transmitted to the BOTDR control PC 2 via the communication unit 29. The measurement data obtained as a result is acquired by the distortion amount information acquisition unit 21 via the communication unit 29. The temperature correction processing unit 22 performs the temperature correction process on the measurement data while referring to the section information stored in the section information storage unit 20. Further, the strain amount determination unit 23 determines whether the strain amount is normal or abnormal based on the data corrected by the temperature correction processing unit 22. Further, the alarm output unit 24 outputs an alarm to a predefined output destination when the strain amount determination unit 23 determines that the strain amount is abnormal.

Next, the data used when the server operates will be described. 3, FIG. 5, FIG. 6, FIG. 7 and FIG.
3 is a schematic diagram showing a data structure and a data example, respectively. FIG. FIG. 3 relates to BOTDR control PC setting information. FIG. 5 relates to channel setting information. FIG. 6 relates to structural distortion non-interference point setting information. FIG. 7 relates to the section setting information. And FIG. 8 relates to alarm setting information. In addition,
The structural distortion non-interference point setting information of FIG. 6, the section setting information of FIG. 7, and the alarm setting information of FIG. 8 are part of the section information stored in the section information storage unit (20) shown in FIG. Is. Also, these data (setting information) are stored in the storage device of the database server 12 shown in FIG. 1 or the storage devices of the servers 1M and 1S.

The BOTDR control PC setting information shown in FIG. 3 is tabular data including BOTDR control PC number (D1), BOTDR control PC name (D2), and temperature correction format (D3) data items. BOTDR control PC
Each has a record (row). The BOTDR control PC number (D1) is a number for identifying the BOTDR control PC in the system. BOTDR control PC name (D2)
Is the name of the BOTDR control PC. The temperature correction method (D3) represents a method of temperature correction processing set for each BOTDR control PC, and is either "1: temperature correction fiber" or "2: structural strain non-interference point". Takes a value.

Here, the above-mentioned two types of temperature square method will be described. FIG. 4 is a schematic diagram showing the characteristics of both of these methods.
(B) shows the structural distortion non-interference point method.

In FIG. 4A, reference numeral 9 is a structure to be measured. Further, 5-1 is an optical fiber for deformation measurement laid on the structure 9. Also, 5-2
Is an optical fiber for measuring only the amount of strain due to temperature. In this temperature correction fiber system, measurement is performed on each of the optical fibers 5-1 and 5-2, and the optical fiber 5 is measured using the measurement result data of the optical fiber 5-2.
The measurement result data of -1 is measured. That is, since the optical fiber 5-1 is laid on the structure 9, the measurement result is expressed by the following equation (1). Measurement result (5-1) = strain amount due to deformation of structure 9 + strain amount due to temperature change (1) On the other hand, the optical fiber 5-2 exists near the optical fiber 5-1. The measurement result is expressed by the following equation (2) because it is not fixed to a structure or the like and is free. Measurement result (5-2) = strain amount due to temperature change (2)

The strain amount in the above equations (1) and (2) is not the absolute strain length but the strain length per unit length in the longitudinal direction of the optical fiber, and is a dimensionless amount. is there. Further, since the optical fiber 5-2 exists near the optical fiber 5-1, it can be considered that both strain amounts due to temperature change are the same. Therefore, the optical fiber 5
By subtracting the measurement result by the optical fiber 5-2 from the measurement result by -1, the strain amount due to the temperature change is canceled and only the strain amount due to the deformation of the structure 9 is obtained as in the following formula (3). You can Strain amount due to deformation of the structure 9 = measurement result (5-1) -measurement result (5-2) (3)

Further, in FIG. 4B, reference numeral 5-3 is an optical fiber in the measurement target section, and the optical fiber in the measurement target section is laid on the structure 9.
Further, 5-4 is a temperature correction measurement section (structural strain non-interference point) of the same optical fiber, and in this temperature correction measurement section, the optical fiber is not fixed to the structure and is free. Is. Similar to the case of the temperature correction fiber method described above, also in the case of this structural strain non-interference point method, the measurement result of the measurement target section (5-3) shows that the strain amount due to the deformation of the structure 9 and the temperature change. The amount of distortion is superimposed. Also,
The measurement result of the temperature correction measurement section (5-4) includes only the strain amount due to the temperature change. Therefore, by subtracting the measurement result of the portion 5-4 from the measurement result of the portion 5-3, only the amount of strain due to the deformation of the structure 9 can be obtained.

The channel setting information shown in FIG. 5 is BOTD.
R control PC number (D11) and BOTDR number (D1
2), channel number (D13), distance range (D1
4), resolution (D15), pulse width (D16),
Number of sections (D17) and correction fiber channel number (D
18) and other setting information (measurement parameters, etc.)
The data is in a tabular format including the data items, and has a record (row) for each channel, that is, for each optical fiber.
The primary key of this table is BOTDR control PC number (D11)
And BOTDR number (D12) and channel number (D13)
Is a composite key of and the channel is specified by the combination of these data items. Also, BOTDR control P
In the BOTDR control PC whose C number is "1", the temperature correction method is "1: temperature correction fiber" (Fig. 3).
Therefore, in the correction fiber channel number (D18) item of each line of this channel setting information, the number of the channel in which the temperature correction optical fiber is accommodated (“8” in the example shown in FIG. 5). Is stored. Also, distance range (D14), resolution (D15), pulse width (D16)
Is a parameter for measurement. Also, the number of sections (D17)
Is the number of sections (tags) included in each channel. The section (tag) will be described in detail later.

The structural distortion non-interference point setting information shown in FIG.
OTDR control PC number (D21), BOTDR number (D22), channel number (D23), correction start point (D24), correction end point (D25), correction target start point (D26), and correction target It is tabular data including the data item of the end point (D27), and has a record (row) for each correction target section. BOTDR control PC number (D2
1), BOTDR number (D22) and channel number (D2)
A channel, that is, an optical fiber is specified by a combination with 3), and a correction target section on this optical fiber is represented by a correction target start point (D26) and a correction target end point (D27). Then, the measurement data of the correction measurement section represented by the correction start point (D23) and the correction end point (D24) is used to make a setting to correct the measurement data of the correction target section.

The section setting information shown in FIG. 7 includes the BOTDR control PC number (D31) and the BOTDR number (D32).
, Channel number (D33) and tag ID (D34)
And tabular data including tag name (D35), start point (D36), and end point (D37) data items,
Each tag ID has a record (row). The tag is a logical unit for referring to a section on the optical fiber. BOTDR control PC number (D31) and BOTD
The combination of the R number (D32) and the channel number (D33) represents the channel (optical fiber) to which the tag belongs. The start point (D36) and the end point (D37) represent the position on the optical fiber in the section indicated by the tag. Further, in the tag name (D35), a name that is easy for the user to understand, such as "A bridge north side" illustrated in FIG. 7, can be set for the section.

The alarm setting information shown in FIG. 8 is the tag ID (D
41), the first alarm threshold value (D42), the second alarm threshold value (D43), the determination direction (D44), and the alarm output destination (D
It is tabular data including the data item 45), and has a record (row) for each tag ID. Tag ID (D41)
Is the tag I set in the section setting information shown in FIG.
It is associated with D (D34) and represents a measurement target section on the optical fiber. First alarm threshold (D4
2) and the second alarm threshold value (D43) are reference values for outputting an alarm relating to the amount of strain, and it is possible to set two-step reference values such as a normal level alarm and a critical level alarm. ing. In the judgment direction (D44),
Any one of "+", "-", and "±" can be set. When the determination direction (D44) is “+”,
An alarm is output when the measured strain amount exceeds the threshold value in the positive direction. When the determination direction (D44) is "-", an alarm is output when the measured strain amount exceeds the threshold value in the negative direction. When the determination direction (D44) is "±", an alarm is output when the measured strain amount exceeds the threshold value in either the positive or negative direction.

The alarm output destination (D45) represents a destination to which the alarm information is output when the distortion amount of the measurement result exceeds the alarm threshold value in a predetermined direction for each tag. This alarm output destination (D45) is provided with a telephone number (for example, "090-1234").
-5678 ") or an email address (for example," mailto: alarm@abc.com ")
Or a file name on the computer (for example, "file:
// alarm. "txt") or "popup"
Can be set. When "popup" is designated as the alarm output destination, the alarm information is displayed in the popup window displayed on the screen of the user's computer.

As described above, since the alarm can be output by using the telephone or the electronic mail, the abnormal situation can be promptly notified even when the manager of each structure is at a remote place.

Next, the processing procedure on the server side when measuring the amount of distortion will be described. FIG. 9 is a flowchart showing a processing procedure on the server side regarding the measurement of the distortion amount for one channel. In the following, description will be given step by step along this flowchart.

First, in step S1, the measurement instruction unit (26) on the server sends the BOT via the BOTDR control PC.
The DR is instructed to measure one channel. This instruction is given based on a predetermined schedule or based on a user's operation. Next, in step S2, the distortion amount information acquisition unit (2
In 1), data of the measurement result by BOTDR (distortion amount information) is acquired via the BOTDR control PC.

Next, in step S3, the temperature correction processing unit (22) on the server refers to the BOTDR control PC setting information shown in FIG. 3, and the temperature correction method of the currently targeted optical fiber is the temperature correction fiber method. Or the structure distortion non-interference point method is determined. Then, in the case of the temperature correction fiber system, the following steps S4 and S5 are executed. In the case of the structural distortion non-interference point method,
Without performing the processing of steps S4 and S5,
Go to 6 and subsequent processing.

In step S4, the correction fiber channel number corresponding to the channel to be measured is specified by referring to the channel setting information shown in FIG. 5, and the measurement instruction unit (26) on the server causes the BOTDR control PC The BOTDR is instructed to measure the channel of the correction fiber. Then, in step S5, the distortion amount information acquisition unit (21) on the server sets B as a result of the instruction.
Data (correction distortion amount) measured by OTDR is acquired.

Next, regarding the channel to be measured, FIG.
The processing from steps S6 to S9 is repeated for each tag ID defined in the section setting information shown in, that is, for each measurement target section.

In step S6, temperature correction calculation for the measurement target section is performed. When the temperature correction is the temperature correction fiber method, the temperature correction calculation is performed using the correction strain amount acquired in step S5. When the temperature correction is the structural strain non-interference point method, the strain amount information (correction strain) of the temperature correction section corresponding to the measurement target section is referred to by referring to the structural strain non-interference point setting information shown in FIG. The amount) is used to calculate the temperature correction.

Then, in step S7, the strain amount information after temperature correction is stored in the database. At this time, the strain amount information may be stored in the database only for the section set in the section setting information shown in FIG. 7 in the entire optical fiber. When measuring the deformation of a structure using BOTDR, one optical fiber may be drawn around and laid on a plurality of structures in order to reduce the number of channels. Since it is sufficient to have the data only for the part of the measurement target section laid in, and the data for the other routed parts is unnecessary, discard the data of the unnecessary part without storing it in the database. The storage area can be saved.

Next, in step S8, the distortion amount determination unit (23) on the server refers to the alarm setting information shown in FIG. 8 to measure the corrected distortion amount calculated above. It is determined whether the first warning threshold value (D42) or the second warning threshold value (D43) for the target section is exceeded. Then, if it exceeds, the process proceeds to step S9, and if it does not exceed, the process of step S9 is not performed and the process related to the measurement target section ends. In step S9, based on the determination result by the distortion amount determination unit (23), the alarm output unit (24) on the server is set as shown in FIG.
The alarm is output to a predetermined output destination by referring to the alarm output destination (D45) of the alarm setting information shown in (4).

Next, the display of the measurement result on the screen will be described. FIG. 10 is a schematic diagram showing a display example of measurement results. The display as shown in FIG. 10 is performed on the console screen of the server (1M, 1S) shown in FIG. 1, the screen of the client (11), and the like. The displayed graph in FIG. 10 is data of one measurement result for a certain channel and represents data after temperature correction. The horizontal axis of the graph represents the position on the optical fiber by the distance from the BOTDR side, and the vertical axis represents the strain amount at each position in με unit. Further, the BOTDR number, the channel number and the tag name are also displayed on the screen at the same time. In addition, the section corresponding to the tag name can be emphasized and displayed on the graph. By performing such a display, the data of the measurement result can be associated with the actual structure, and information that is visually easy to understand can be provided to the user.

Further, in addition to the graph of the pattern shown in FIG. 10, for example, a graph of the results of a plurality of measurements (every hour, every day, etc.) is displayed in an overlapping manner,
Various displays are possible, such as displaying only a time-series change of the strain amount at a certain point on the optical fiber.
When the past measurement data is used for displaying a graph, the storage destination database in step S9 of FIG. 9 is referred to.

Next, the function of the measurement instruction section (26) for more accurate strain amount measurement will be described. As described above, the BOTDR obtains the amount of distortion by injecting pulsed light into one end of the optical fiber and measuring the backscattered light thereof. However, in the state where the operation of the light emitting section of the BOTDR is not stable, The waveform of the pulsed light may be unstable, and in such a case, an error may occur in the measurement result. In order to stabilize the operation of the light emitting portion of the BOTDR, it is known that the pulsed light may be actually emitted several times. Therefore, the measurement instruction unit (26) on the server
Can instruct the BOTDR to start measurement after instructing the BOTDR to emit pulsed light a predetermined number of times for the purpose of stabilizing the measurement via the BOTDR control PC. This allows
Since the operation of the light emitting portion of the BOTDR is stable at the start of the measurement, it is possible to perform the measurement with less error.

Next, the function of the measurement scheduling unit (25) for facilitating the preparation of the measurement schedule will be described. As described above, in the present system, the measurement instruction unit 26 can automatically issue a measurement instruction to the BOTDR based on the schedule managed by the measurement scheduling unit 25. However, if the set schedule itself is inappropriate,
The problem that desired measurement cannot be performed may occur.

Specifically, assuming that a plurality of optical fibers exist under a certain BOTDR, the measurement start time scheduled for the second optical fiber is higher than the measurement start time scheduled for the first optical fiber. Is slower, and the measurement start time of the first optical fiber and the second
If the difference from the measurement start time of the second optical fiber is shorter than the measurement start time of the first optical fiber, the measurement start scheduled for the second optical fiber is completed before the measurement of the first optical fiber is completed. The problem arises that the time will arrive. On the contrary, if the setting of the measurement start time of the second optical fiber is too late under the same condition, the time between the measurement of the first optical fiber and the measurement of the second optical fiber is delayed. Therefore, there arises a problem that measurement efficiency is deteriorated.

Therefore, the measurement scheduling unit (25)
To have a function of calculating the measurement required time for each optical fiber based on the preset measurement conditions and setting the measurement start time of each optical fiber based on the calculated measurement required time. To do. Here, the “preset measurement condition” includes the distance range (D14) and the resolution (D15) of the channel setting information shown in FIG. 5, and the measurement scheduling unit (25) The required measurement time is calculated using a predetermined calculation formula based on the data. This makes it possible to solve the above problems and automatically create an appropriate schedule that meets the measurement conditions.

The server shown in FIG. 1 (1M, 1M
S), BOTDR control PC (2), client (1
1), database server (12), manager (1
3) is realized using a computer. Then, creating a measurement schedule, measuring instructions, acquiring strain amount information,
The processes of the temperature correction process, the distortion amount determination process, and the alarm output process are stored in a computer-readable recording medium in the form of a program, and the computer reads and executes the program to Processing is performed. Here, the computer-readable recording medium means a magnetic disk, a magneto-optical disk, a CD-RO.
M, DVD-ROM, semiconductor memory, etc. Further, the computer program may be distributed to the computer via a communication line, and the computer that receives the distribution may execute the program.

The embodiments of the present invention have been described in detail above with reference to the drawings. However, the specific configuration is not limited to these embodiments, and the design etc. within the scope not departing from the gist of the present invention are also possible. included.

As an example, in the structural strain non-interference point setting information shown in FIG. 6, the correction start point, the correction end point, the correction target start point, and the correction target end point are respectively represented by information on the position in meters. Instead, however, the tag ID defined by the section setting information shown in FIG. 7 may be used to represent the correction target section and the temperature correction measurement section.

[0055]

As described above, according to the present invention, the section information storage unit stores in advance the section information including the starting point position information and the ending point position information of the section on the optical fiber in the strain measuring system. Since it is provided, the section on the optical fiber and the structure corresponding to the section can be previously associated with each other in terms of data. Further, a strain amount information acquisition unit for acquiring strain amount information for each position on the optical fiber measured by the optical fiber strain measuring device, and included in the section based on the strain amount information acquired by the strain amount information acquisition unit. Extract the strain amount of the position to be provided, because the strain amount determination unit for determining whether the strain amount is within the normal range for each section, to obtain the strain amount information for each position on the optical fiber, the The strain amount information associated with the structure can be acquired from the position and the section information, and it can be automatically determined whether the strain amount information is within the normal range. Therefore, compared to the conventional method, it is possible to save the time and labor for analyzing the acquired data.

Further, according to the present invention, the strain measurement monitoring system corrects the temperature based on the strain amount information of the measurement target section acquired by the strain amount information acquisition unit and the correction distortion amount of the temperature correction measurement section. Since it has a temperature correction processing unit that performs processing, it is possible to automatically perform temperature correction processing by setting the relationship between the measurement target section and the temperature correction measurement section in advance, and analyze the data. The time and effort to do it can be saved further.

Further, according to the present invention, since the strain measurement monitoring system has the measurement instructing section for instructing the measurement start by the optical fiber measuring instrument, the strain measurement can be performed by the remote control from the center. Becomes Therefore, it is not necessary to circulate and operate the distributed optical fiber measuring instruments.

Further, according to the present invention, the measurement instructing section is
Since the optical fiber measuring instrument is instructed to start the measurement after instructing the pulsed light emission for a predetermined number of times to stabilize the measurement, the measurement error caused by the unstable light emitting part of the optical fiber measuring instrument is prevented. Therefore, it becomes possible to accurately monitor the amount of strain.

Further, according to the present invention, the strain measurement monitoring system calculates the required measurement time for each optical fiber based on the preset measurement conditions, and based on the calculated required measurement time, the respective optical fibers are measured. Since a measurement scheduling unit that sets the measurement start time is provided, even when multiple optical fibers are connected to one optical fiber measuring instrument, the measurement time schedules do not overlap and the intervals are not too long. It becomes possible to monitor the amount of strain according to an appropriate and efficient measurement schedule.

[Brief description of drawings]

FIG. 1 is a schematic diagram showing a configuration of a strain measurement monitoring system according to an embodiment of the present invention.

FIG. 2 is a block diagram showing an internal configuration of a server in the strain measurement and monitoring system of the same embodiment.

FIG. 3 is a schematic view showing a data structure and an example of data of BOTDR control PC setting information according to the same embodiment.

FIG. 4 is a schematic diagram showing a method for temperature correction in the same embodiment, FIG. 4A shows a temperature correction fiber method,
(B) shows the structural distortion non-interference point method, respectively.

FIG. 5 is a schematic diagram showing a data structure and data example of channel setting information according to the same embodiment.

FIG. 6 is a schematic diagram showing a data structure and data example of structural distortion non-interference point setting information according to the same embodiment.

FIG. 7 is a schematic diagram showing a data structure and data example of section setting information according to the same embodiment.

FIG. 8 is a schematic diagram showing a data structure and data example of alarm setting information according to the same embodiment.

FIG. 9 is a flowchart showing a processing procedure on the server side regarding measurement of a distortion amount for one channel in the same embodiment.

FIG. 10 is a schematic diagram showing an example in which data of measurement results according to the same embodiment is displayed on a screen by a graph.

[Explanation of symbols]

1M, 1S server 2 BOTDR control PC 3 BOTDR 4 optical switch 5-1, 5-2, 5-3, 5-4 Optical fiber 9 structures 10 network 11 clients 12 Database server 13 managers 20 section information storage 21 Strain amount information acquisition unit 22 Temperature correction processing unit 23 Distortion amount determination unit 24 Alarm output section 25 Measurement Scheduling Unit 26 Measurement instruction section 29 Communications Department

Claims (9)

[Claims] 1. A section information storage unit that stores in advance section information including start point position information and end point position information of a section on an optical fiber, and each position on the optical fiber measured by an optical fiber strain measuring device. Distortion amount information acquisition unit that acquires the distortion amount information, and extracts the distortion amount of the position included in the section based on the distortion amount information acquired by the distortion amount information acquisition unit, the distortion amount for each section normal range A strain measurement monitoring system, comprising: a strain amount determination unit that determines whether or not it is inside. 2. The temperature correction system, wherein the strain measurement monitoring system performs a temperature correction process based on the strain amount information of the measurement target section acquired by the strain amount information acquisition section and the correction distortion amount of the temperature correction measurement section. The processing unit is provided, and the strain amount determination unit determines whether or not the strain amount after the correction processing by the temperature correction processing unit is within a normal range. Strain measurement monitoring system. 3. The section information storage unit stores the section information relating to both the temperature-correction measurement section and the measurement target section provided on one optical fiber. The strain measurement monitoring system according to Item 1 or 2. 4. The distortion amount information acquisition unit acquires the distortion amount information regarding a plurality of optical fibers, and the section information includes optical fiber identification information for identifying an optical fiber, The section information storage unit stores the section information relating to both a temperature correction measurement section provided on an optical fiber dedicated to temperature correction and a measurement target section provided on another optical fiber. The strain measuring and monitoring system according to claim 1 or 2. 5. The optical fiber measuring device inputs a measuring pulsed light to the optical fiber, and measures a strain amount for each position on the optical fiber based on a reflected light component from the optical fiber. It is BOTDR, The said distortion measurement monitoring system is provided with the measurement instruction | indication part which gives the instruction | indication of the measurement start by the said optical fiber measuring device, The distortion measurement monitoring in any one of Claim 1 to 4 characterized by the above-mentioned. system. 6. The measurement instructing unit is configured to instruct the optical fiber measuring instrument to start measurement after instructing a predetermined number of times of pulsed light emission for stabilizing measurement. The strain measurement monitoring system according to claim 5. 7. A measurement scheduling unit that calculates a measurement required time for each optical fiber based on preset measurement conditions and sets a measurement start time of each optical fiber based on the calculated measurement required time. The strain measurement monitoring system according to claim 5, wherein the measurement instructing unit issues an instruction to start measurement based on the measurement start time set by the measurement scheduling unit. 8. A first process of instructing BOTDR to measure a strain amount, and a second process of acquiring strain amount information obtained as a result of this measurement instruction.
And a third step of performing a temperature correction process relating to the strain amount information by using measurement data relating to the temperature correction measuring section. 9. When the distortion amount information exceeds the threshold value by comparing the distortion amount information after the correction processing in the third process with a threshold value stored in advance in a storage unit, The strain measurement monitoring method according to claim 8, further comprising a fourth step of outputting an alarm to a preset alarm output destination.