JP2002061157A - Supervising method and apparatus for sluice gate - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method and apparatus for centralized-supervising the open and close state of sluice gates studded in a wide area accurately and economically in the case of no power supply equipment and information transmitting equipment. SOLUTION: Among three kinds of sensor functions of an optical fiber, a Rayleight scattering is used to transmit an optical pulse to the optical fiber, and according to the open and close state of the water gate, bending is applied directly or indirectly to the optical fiber to generate a loss. As a result, Rayleigh scattered light is decreased to measure the change of light intensity. Pulse light is let enter from the tip parts of the plural optical fibers 16, the distance to the change point of quantity of light of scattered light due to bending of the optical fibers 16 interlocking with the opening and closing of the plural studded water gates is operated and detected according to the measurement of time from the incident end of the pulse light, thereby centralized-supervising the opening and closing of the plural water gates 12.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to river management,
The present invention relates to a floodgate monitoring method and apparatus for centrally monitoring the open / close state of a large number of floodgates provided in a river such as a lake.

[0002]

2. Description of the Related Art In large-scale sluice gate facilities, which are river management facilities, gate opening and closing work from a distance is substantially automated. However, there are a large number of small gutters and gutters provided in lakes and marshes such as lakes, swamps, reservoirs, and rivers to allow water to flow in or out, such as lakes 15 shown in FIG.
In the case of Lake Kasumigaura, about 500 sluices and sluices are scattered in the river around the lake 15 and the sluices 12 and 13 of the majority of sluices and sluices are manually operated. Monitoring of opening and closing was being performed.

Concentration of sluices 12 and 13 for gutters and pipes, such as water rights for irrigation water in fields and fields, countermeasures against floods and withering in upstream and downstream areas, monitoring of inflow and outflow of sewage, etc. Management is extremely important.

[0004]

If the monitoring of the opening and closing of the sluice has been performed by hand, as in the prior art, it is difficult to determine whether or not the gate plate of the sluice is completely closed by hiding the gate plate underwater. Not only is it difficult to do so, but it is also burdensome for the operation contractor, such as bad weather, nighttime, 24-hour detention, etc., and centrally managing the opening and closing of all sluice gates scattered over a wide area around the lake Was extremely difficult.

[0005] Further, most of the gutters and gutters scattered in a wide area around lakes and marshes are not provided with power supply facilities, information transmission facilities, etc., so that centralized monitoring and centralized management are more difficult. I was doing it.

The present invention provides a method and apparatus for accurately and economically centrally monitoring the open / closed state of floodgates scattered in a wide area even if power supply equipment, information transmission equipment, and the like are not provided. It is intended to provide.

[0007]

SUMMARY OF THE INVENTION According to the present invention, an optical fiber is laid around a sluice around a lake, and the open / closed state of the sluice is more reliably and economically achieved by the sensor function of the optical fiber. It is intended to detect it. Optical fiber originally has functions such as wide area measures, high speed measures, multimedia support, and real-time support as an information transmission path, and also has a function as a sensor that can directly measure various physical quantities. . In particular, in the management of vast rivers, the advantages of optical fiber are that it can be used continuously, that the material is stable,
By taking advantage of the fact that accurate position determination can be performed immediately, more advanced river management is possible.

The sensor function of the optical fiber includes three types of scattering phenomena of the optical fiber (Rayleigh scattering, Raman scattering, and Brillouin scattering). In particular, the present invention utilizes Rayleigh scattering. The sensor principle of this Rayleigh scattering is to transmit a light pulse to an optical fiber and measure the loss, the amount of reflection, and the position of the disconnection in the longitudinal direction of the optical fiber. The specific monitoring method is to measure the change in light intensity by giving a loss to the optical fiber by directly or indirectly bending the optical fiber in accordance with the open / closed state of the floodgate, and consequently reducing the Rayleigh scattered light. Things.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, specific embodiments will be described with reference to the drawings. First, the principle of the optical fiber sensor using Rayleigh scattered light will be described with reference to FIG. In FIG. 2, 40
Is, for example, a pulse light generator that outputs a pulse light having a pulse width of 1000 ns, 41 is a half mirror that refracts light reflected from the optical fiber 16 (or the optical fiber 17, the same applies hereinafter), and 42 is incident light that has returned. This is a light receiving unit that receives light having the same wavelength as the light, measures the amount and time of the light, and detects whether the specific floodgate 12 is open or closed. The pulse width of the pulsed light can be adjusted within a range of about 20 ns to 5000 ns depending on the purpose in order to increase the resolution depending on the distance.

Rayleigh scattering phenomenon The optical fiber 16 is manufactured in a process of melting quartz glass and cooling the same. However, during cooling, the molecules of the glass are frozen at an arbitrary position. Then, a structural portion having a changed density (refractive index) occurs. When light passes through such a structural part, the light is refracted due to a difference in refractive index from other parts, and light having the same wavelength as a part of the incident light returns to the incident end. This is the Rayleigh scattering phenomenon. Loss distribution measurement By measuring the amount and time of light returning from the light incident end of the optical fiber 16 to the incident end due to Rayleigh scattering, the attenuation characteristics in the longitudinal direction of the optical fiber 16 itself and the optical fiber 16 Abnormal (bending) of the structure of the optical fiber 1
The connection loss at the connection point 6 is measured.

[0011] Strain displacement measurement When the optical fiber 16 is bent (bent portion 43 in FIG. 2), light transmitted from the optical fiber 16 is generated, and as a result, Rayleigh scattered light is also reduced. To detect strain and displacement. Measurement of disconnection position The time required for the light totally reflected at the disconnection position of the optical fiber 16 to return to the light incident end is measured, and the disconnection position is measured.

A specific configuration example in which the sensor function of the optical fiber 16 by the Rayleigh scattered light as described above is used for the sluice gate 12 (or sluice gate 13, hereinafter the same) of a gutter or a gutter pipe will be described with reference to FIGS. . In FIG. 3, columns 22 are vertically built on water channel walls 21 on both sides of a river 20, and two vertical lifting shafts 24 are provided vertically from a girder 23 above the columns 22. . This elevating shaft 24 is
The gate plate 19 at the lower end is moved up and down by a manual or electric drive unit 25 to move up and down along the guide rail 26 to open and close the floodgate 20. The gate plate 19
An opening / closing detection unit 28 is attached to the lower part of the column 22 and facing the interlocking unit 27, and a detection signal generation unit is provided above the column 22. 29 is provided to constitute an optical fiber bending means.

The details of the open / close detection unit 28 and the detection signal generation unit 29 which are the bending means of the optical fiber will be described with reference to FIG.
6 is fixed at one end by a fixing member 37 and the tension spring 3
Since the optical fiber 16 is pulled at 8, it is normally in a straight line, and the large-diameter bent guide plate 33 is bent at a large diameter so that the optical fiber 16 does not suffer loss due to bending. Therefore, no optical loss has occurred.

In the open / close detecting section 28, a contact 30 always projects outward due to an internal coil spring or the like. When the gate plate 19 is operated by the manual or electric drive unit 25 and is completely closed, the projection of the interlocking unit 27 moves to the position of the contact 30 and pushes the contact 30.

When the contact 30 is pushed in, the contact 30
Is guided by the guide tube 32, and the distal end of the wire 31 protrudes from the inside of the detection signal generating unit 29,
The pressing projection plate 34 of the bending portion 36 is pushed upward. Then, the optical fiber 16 is sandwiched between the fixed concave groove plate 35 and the optical fiber 16 is bent into a mountain shape. Since this bending corresponds to the bent portion 43 in FIG. 2, it is possible to detect which floodgate 12 is closed (the Xth floodgate in FIG. 2) from the change in the amount of light and the measurement time. When bending occurs at two or more locations, similar changes occur at the respective bending positions, so that it is possible to further detect whether the floodgate 12 is closed (Y-th floodgate in FIG. 2).

The opening / closing detection unit 28 is turned on while the gate plate 19 is closed to detect the open / closed state of the gate plate 19.
9 is normally open, because it is necessary to accurately grasp the closed state of the sluice gate 12 in order to prevent the water from flowing from the main river to the tributary.

Next, a specific installation for centralized management of a plurality of sluice gates 12 around the lake 15 will be described. In FIG. 5, reference numeral 10 denotes a central management office. It is assumed that five A, B, C, D, and E branch offices 11 provided around the lake 15 are managed. Of these, the A branch office 11 stretches the optical fiber 16 around the floodgate 12 up to the management boundary line 14 with the B side, and
One sluice gate 12 is monitored, and an optical fiber 17 is stretched around the sluice gate 12 up to the management boundary line 14 with the C side.
Monitor 0 sluices 13 and 121 sluices 1 in total
Monitor 2 Similarly, B branch office 11 has 79 locations, C
The branch office 11 monitors 52 places, the D branch office 121 monitors 121 places, and the E branch office 11 monitors 85 places.

FIG. 1 shows a specific example of installation of the optical fibers 16 and 17 in the A branch office 11. In FIG. 1, floodgates 12 (12a1, 12a2, 12a3,...) Are sequentially scattered from an A branch office 11 to a B branch office 11, and optical fibers 16 (16a1, 16a2, 16) are provided.
a3,...), and similarly, the floodgates 13 (13a1, 1a1) are sequentially moved from the A branch office 11 to the C branch office 11.
3a2, 13a3,...) And the optical fiber 1
7 (17a1, 17a2, 17a3,...) Are stretched.

The monitoring distance range, ie, the optical fibers 16, 1
When the length of 7 is 50 km, the optical fibers 16, 17
Is about 10 m, but if a transmission loss occurs when the lock 12 is closed, if the distance between the adjacent locks 12 is too short, the lock 12 above the closed lock 12 cannot be measured. Dead zones occur. However, when the adjacent floodgates 12 have a sufficient distance, normal measurement can be performed.

Therefore, when the distance between the adjacent floodgates 12 is not sufficient (for example, at intervals of several tens of meters to several hundred meters).
In order to avoid the dead zone problem and perform accurate measurement, it is necessary to assemble the optical fibers 16 and 17 in a staggered wiring system as shown in FIG. In FIG. 1, sluice gates 12a1, 12a4, 12a7,
Are connected in series, and the sluice gate 12a is connected to the optical fiber 16a2.
, 12a5, 12a8,... Are connected in series, and sluice gates 12a3, 12a6, 12a9,.
Are connected in series. The same applies to the optical fiber 17 and the floodgate 13. In FIG. 1, the distribution is regularly performed in an order, but the wiring may be irregularly arranged according to the interval between the adjacent floodgates 12 and the number of the floodgates 12.

In the above configuration, the gates 12a1, 12a2, 12a3,... And the gate 13a in FIG.
Of the 1, 13a2, 13a3,..., The hatched circles are closed and the open circles are open.
, 12a4, 12a7,..., The light receiving level loss appears at the corresponding time axis positions, and the floodgates 12a1, 12a4,
.. Indicate a closed state, and similarly, in the optical fiber 16a2, a loss of the light reception level appears at the position on the time axis corresponding to the sluices 12a5, 12a8,.
, 2a5, 12a8,... Indicate that the optical fiber 16a3 is open, with no loss of the received light level at the corresponding position on the time axis. The same applies to the optical fiber 17 and the floodgate 13. In this way, the A branch 11 can monitor the opening and closing of the 121 floodgates 12 and 13.

Similarly, the B branch office 11 has 79 locations,
The C branch office 11 monitors 52 places, the D branch office 121 monitors 121 places, and the E branch office 11 monitors 85 places. The data is sent to the central management office 10 and all the floodgates 12 are monitored.
Is monitored for opening and closing.

[0023]

According to the first aspect of the present invention, pulse light is incident from one or a plurality of optical fibers 16 at the tip end thereof.
Optical fiber 1 linked to opening and closing of multiple floodgates 12
The distance to the point where the amount of Rayleigh scattered light changes due to the bending of 6 is calculated and detected by measuring the time from the incident end of the pulsed light, and the opening and closing of the plurality of floodgates 12 is monitored in a centralized manner. It is reliable to determine whether the board is completely closed, and it can be monitored constantly regardless of the weather, time, etc.
Further, since an optical fiber is used, centralized monitoring and centralized management can be easily performed even in a place where power supply equipment, information transmission equipment, and the like are not provided. Especially in the management of vast rivers, the advantages of optical fiber are:
More advanced river management is possible by utilizing the advantages such as continuous use, stable material, and quick and accurate position determination.

According to the second aspect of the present invention, the opening and closing of a plurality of floodgates 12 can be centrally monitored by one optical fiber 16.

According to the third aspect of the present invention, the pulse light is incident from the tip portions of the plurality of optical fibers 16 respectively.
Optical fiber 1 linked to opening and closing of a plurality of floodgates 12 grouped by staggered wiring for each of a plurality of optical fibers 16
The distance to the point where the amount of Rayleigh scattered light changes due to the bending of 6 is calculated and detected by measuring the time from the incident end of the pulse light for each of the plurality of optical fibers 16 to centrally monitor the opening and closing of the plurality of floodgates 12. As a result, even if a large number of floodgates 12 are scattered, the monitoring can be performed reliably.

According to the fourth aspect of the present invention, the grouping based on the staggered wiring is such that the distance between the adjacent floodgates 12 is greater than the undetectable distance due to the transmission loss. Can be reliably monitored without dead zones even when the distance between the objects is short.

According to the fifth aspect of the present invention, a bending means is provided at each of the sluice gates 12 scattered, and applies bending to the optical fiber 16 in conjunction with opening and closing of the sluice gate 12; And a light receiving unit 42 that measures the amount and time of light returning to the pulse light incidence end of the optical fiber 16 and detects the opening and closing of a specific floodgate 12. Therefore, the configuration of the device itself can be provided simply and inexpensively, and the device can be used for a long time.

According to the sixth aspect of the present invention, the bending means is configured to be turned on when the water gate 12 is closed.
By accurately grasping the closed state of the floodgate 12, which is normally open, it is possible to prevent water from flowing from the main river to the tributary river due to flooding.

According to the seventh aspect of the present invention, the bending means includes an opening / closing detecting section which operates when the gate plate 19 is closed by the interlocking section 27 which interlocks with the gate plate 19 of the floodgate 12, and
The opening / closing detecting section 28 normally controls the linear optical fiber 1.
Detection signal generator 2 having a bending generator 36 that bends the sensor 6
Therefore, despite being mounted at a position where it is exposed to rain and wind, it is possible to operate reliably and for a long period of time.

[Brief description of the drawings]

FIG. 1 is an explanatory view showing an embodiment in which a monitoring method and a device of a floodgate according to the present invention are wired in a staggered manner.

FIG. 2 is a block diagram of a circuit and a description of the principle of Rayleigh scattering used in the method and apparatus for monitoring a floodgate according to the present invention.

FIG. 3 is an explanatory diagram showing a state in which a method and an apparatus for monitoring a sluice according to the present invention are installed in the sluice.

FIG. 4 is an explanatory diagram of a specific configuration of a bending means used in the method and the apparatus for monitoring a floodgate according to the present invention.

FIG. 5 is an explanatory view showing a state in which a method and an apparatus for monitoring a floodgate according to the present invention are actually arranged in a lake or marsh.

[Explanation of symbols]

10 central administration office, 11 branch office, 12 sluice gate, 1
3 ... Sluice gate, 14 ... Management boundary line, 15 ... Lake, Marsh, 16, 17
... Optical fiber, 19 ... Gate board, 20 ... River, 21 ... Water channel wall, 22 ... Post, 23 ... Girder, 24 ... Elevating shaft, 25 ... Driver, 26 ... Guide rail, 27 ... Interlocking part, 28 ... Open / close detection Section, 29: detection signal generating section, 30: contact, 31 ...
Wire rod, 32: guide tube, 33: large-diameter bent guide plate, 34:
Pressing protruding plate, 35 ... groove plate, 36 ... bending occurrence part, 37 ...
Fixing member, 38: tension spring, 40: pulse light generator, 41: half mirror, 42: light receiving section, 43: bending section.

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Kenji Yano 3-6-6 Kandanishikicho, Chiyoda-ku, Tokyo Dentsu Consultants Inc. (72) Inventor Tsuyoshi Ishimaru 3-6-6 Kandanishikicho, Chiyoda-ku, Tokyo Dentsu Consultants F term (for reference) 2D019 AA43 2F065 AA06 CC00 FF31 FF41 LL02 NN08 2F073 AA01 AB01 AB06 BB06 BC04 CC02 CD12 DD02 GG01 GG04

Claims (7)

[Claims] 1. A pulse light is incident from one or a plurality of optical fiber tips, and a distance to a change point of the amount of Rayleigh scattered light due to bending of an optical fiber interlocking with the opening and closing of a plurality of sluice gates is determined. A method of monitoring the opening and closing of a plurality of floodgates by centrally monitoring the opening and closing of a plurality of floodgates by calculating and detecting by measuring the time from the incident end of the pulsed light. 2. A light amount of Rayleigh scattered light due to bending of an optical fiber that is interlocked with opening and closing of a plurality of scattered water gates connected to one optical fiber by injecting pulse light from the tip of one optical fiber. A method of monitoring the opening and closing of a plurality of floodgates in a centralized manner by calculating the distance to the change point of the above by measuring the time from the incident end of the pulsed light. 3. Rayleigh scattered light caused by bending of an optical fiber linked to opening and closing of a plurality of water gates, each of which receives pulsed light from the tip end of the plurality of optical fibers and is divided into groups by staggered wiring for each of the plurality of optical fibers. Wherein the distance to the change point of the light amount is calculated and detected by measuring the time from the incident end of the pulse light for each of the plurality of optical fibers, and the opening and closing of the plurality of floodgates is monitored intensively. Monitoring method. 4. The method according to claim 3, wherein the grouping based on the staggered foot wiring is such that the distance between adjacent water gates is greater than an undetectable distance due to transmission loss. 5. A bending means which is provided at each of dotted water gates and applies bending to an optical fiber in response to opening and closing of the water gate, a pulse light generator which inputs pulse light from the tip of the optical fiber, A water gate monitoring device, comprising: a light receiving unit that detects the opening and closing of a specific water gate by measuring the amount and time of light returning to a pulse light incident end of an optical fiber. 6. The floodgate monitoring device according to claim 5, wherein the bending means is turned on when the floodgate is closed. 7. A bending means which is provided at each of the sluice gates which are scattered, and which applies a bend to the optical fiber in conjunction with opening and closing of the sluice; a pulse light generator which inputs pulse light from the tip of the optical fiber; A light receiving unit that detects the opening and closing of a specific floodgate by measuring the amount and time of light returning to the pulsed light incident end of the optical fiber, wherein the bending unit is an interlocking unit that interlocks with the gate plate of the floodgate And a detection signal generator having a bend generator which bends a normally linear optical fiber by the open / close detector.