CN112729523B - Well lid anti-theft sensor based on optical fiber technology - Google Patents
Well lid anti-theft sensor based on optical fiber technology Download PDFInfo
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- G01—MEASURING; TESTING
- G01H—MEASUREMENT OF MECHANICAL VIBRATIONS OR ULTRASONIC, SONIC OR INFRASONIC WAVES
- G01H9/00—Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves by using radiation-sensitive means, e.g. optical means
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Abstract
The invention provides a well lid anti-theft sensor based on optical fiber technology, comprising: the optical fiber sensor comprises a shell (1), a sensing optical fiber (2), an optical fiber traction component (3), a resetting device (4) and a wiring flange (5); the shell (1) is arranged on the outer layer of the well lid anti-theft sensor realized based on the optical fiber technology; the sensing optical fiber (2) is arranged in the shell (1); the optical fiber traction component (3) and the sensing optical fiber (2); the resetting device (4) is arranged in the optical fiber traction component (3); the connection flange (5) is connected with the sensing optical fiber (2). The invention solves the problems of heavy weight, high cost, difficult construction and the like of a sensor used by vibration optical fiber security equipment which is realized based on an OTDR optical fiber technology.
Description
Technical Field
The invention relates to the technical field of anti-theft sensors, in particular to a well lid anti-theft sensor based on an optical fiber technology, especially relates to a well lid anti-theft sensor based on an optical fiber technology, and especially relates to a well lid anti-theft sensor based on an optical fiber technology, which has high sensitivity and large response bandwidth.
Background
The optical fiber sensing system generally comprises a light source, a guiding optical fiber, an optical fiber sensor, a photoelectric detector and a signal processing part. Since optical fibers are sensitive to external environmental factors, changes in environmental conditions such as temperature, pressure, electric field, magnetic field, etc. will cause changes in optical parameters such as light intensity, phase, frequency, polarization state, etc. Therefore, a device for obtaining a value to be measured by modulating an optical wave parameter transmitted in an optical fiber to be measured and demodulating and detecting a modulated optical wave signal is studied by utilizing the characteristic of the optical fiber. The optical fiber sensor detects the magnitude of each corresponding physical quantity according to the change relation of certain parameters along with external factors.
Patent document CN106644159a discloses an optical fiber sensor, an optical fiber sensor manufacturing method, and an optical fiber sensor measurement system. The optical fiber sensor includes: a first optical fiber and a second optical fiber; the first optical fiber and the second optical fiber are both cylinders; the first cross section of the first optical fiber is welded with the first cross section of the second optical fiber; the first optical fiber is coaxial with the second optical fiber; the first cross section of the second optical fiber is provided with a cylindrical bore coaxial with the second optical fiber. The patent still leaves room for improvement in terms of structure and performance.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a well lid anti-theft sensor based on an optical fiber technology.
The invention provides a well lid anti-theft sensor based on optical fiber technology, comprising: the optical fiber sensor comprises a shell 1, a sensing optical fiber 2, an optical fiber traction component 3, a resetting device 4 and a wiring flange 5;
the shell 1 is arranged on the outer layer of the well lid anti-theft sensor realized based on the optical fiber technology;
the sensing optical fiber 2 is arranged inside the shell 1;
the optical fiber traction component 3 and the sensing optical fiber 2;
the resetting device 4 is arranged in the optical fiber traction component 3;
the connection flange 5 is connected with the sensing optical fiber 2.
Preferably, the method further comprises: a sensor;
the housing 1 is capable of restraining the sensing fiber 2;
the housing 1 is capable of holding a sensor;
the size of the housing 1 is larger than the minimum loss diameter of the sensing fiber 2.
Preferably, the sensing fiber 2 is a fiber reinforced by secondary coating.
Preferably, the optical fiber traction component 3 can drive the sensing optical fiber 2 to deform;
the optical fiber pulling member 3 includes: an upper traction body, a lower traction body and a base plate;
preferably, the optical fiber traction component 3 can drive the sensing optical fiber 2 to deform;
the optical fiber pulling member 3 includes: an upper traction body, a lower traction body and a base plate.
Preferably, the resetting device 4 adopts any one of the following:
-a spring;
-an elastic component of plastic construction.
Preferably, the connection flange 5 comprises: sensor input optical fiber connecting component and sensor output optical fiber connecting component;
the sensor input optical fiber connecting component is connected with the sensing optical fiber 2;
the sensor output optical fiber connecting component is connected with the sensing optical fiber 2;
when the on-site welding is convenient, the optical fiber head can be directly thrown out of the shell for more than 50 cm in length without being used, and the welding is convenient.
Preferably, the connection flange 5 adopts an FC-UPC optical fiber connection flange with smaller transmission attenuation, which is used for facilitating the connection and use of the sensor, and when the field welding is convenient, the flange connection can be omitted, so that the cost can be saved, and the flange connection is omitted.
When the well lid is in a normal state, the bending radius of the sensing optical fiber 2 is larger than 4 cm, and alarm result information is acquired;
when the well lid state is abnormal, the sensing optical fiber 2 is driven by the optical fiber traction component 3 and the resetting device 4 to generate radius bending with the threshold value smaller than the set threshold value, the bending radius of the sensing optical fiber 2 is smaller than 4 cm, and alarm result information is obtained.
The sensing optical fiber is reinforced by secondary coating, so that the strength and elasticity of the bare fiber are improved, and the input end and the output end are fixed on the shell; when the well lid is in a normal state, the bending radius of the sensing optical fiber 2 is larger than 4 cm, at the moment, the attenuation of an optical signal through the optical fiber is very weak, and the monitoring equipment does not generate an alarm action on the point; when the well lid state is abnormal, the sensing optical fiber 2 is driven by the optical fiber traction component 3 and the resetting device 4 to generate small-radius bending, the radius is smaller than 4 cm, at the moment, the attenuation of an optical signal passing through the optical fiber can be increased sharply, and the monitoring equipment generates an alarm action for the point.
Compared with the prior art, the invention has the following beneficial effects:
1. the invention solves the problems of heavy weight, high cost, difficult construction and the like of a sensor used by vibration optical fiber security equipment which is realized based on an OTDR optical fiber technology.
2. The invention improves the performance index of the technology and reduces the false alarm rate of the equipment.
3. The invention greatly reduces the material cost, weight and construction cost of the optical fiber vibration sensor, and can be widely popularized and applied.
Drawings
Other features, objects and advantages of the present invention will become more apparent upon reading of the detailed description of non-limiting embodiments, given with reference to the accompanying drawings in which:
fig. 1 is a schematic structural diagram of a well lid anti-theft sensor based on an optical fiber technology.
Fig. 2 is a schematic state diagram of a well lid anti-theft sensor based on an optical fiber technology.
Fig. 3 is a schematic diagram of a first embodiment of the present invention.
Fig. 4 is a schematic diagram of a second embodiment of the present invention.
Detailed Description
The present invention will be described in detail with reference to specific examples. The following examples will assist those skilled in the art in further understanding the present invention, but are not intended to limit the invention in any way. It should be noted that variations and modifications could be made by those skilled in the art without departing from the inventive concept. These are all within the scope of the present invention.
1-4, the well lid anti-theft sensor based on the optical fiber technology is composed of a shell, a sensing optical fiber, an optical fiber traction device, a resetting device and a wiring flange, and is used for well lid management of underground pipelines in municipal, electric and communication departments. The well lid anti-theft sensor applied at present is an electrical sensor (vibration and gesture) and is realized by an auxiliary internet of things technology. The well lid anti-theft sensor based on the optical fiber technology adopts the optical fiber as a sensing medium, and can form an optical fiber safety monitoring network with almost no cost by utilizing an optical cable network (redundant optical fiber) originally arranged in a pipeline, thereby directly forming a well lid safety management system of related industries.
Comprising the following steps:
1. a shell: restraining the sensing optical fiber and fixing the sensor, wherein the size is larger than the minimum loss diameter of the optical fiber;
2. sensing optical fiber: the reinforced optical fiber is coated for the second time and is used for sensitive devices;
3. optical fiber traction device: the function is to drive the optical fiber to deform, which is composed of an upper traction body, a lower traction body and a base plate;
4. reset device: an elastic component formed by a spring or a plastic structural member and used for controlling the optical fiber traction device to return to a deformation position;
5. junction flange: and a connector for input and output optical fibers of the sensor. When the on-site welding is convenient, the optical fiber head can be directly thrown out of the shell (the length is more than 50 cm) without being used, and the welding is convenient.
The shell is made of metal, plastic or other materials, when the sensor does not act, the sensing optical fiber is stored, the optical fiber is kept in a state without bending loss, and the size is generally more than 5 cm; when the sensor acts, the sensor and the optical fiber traction device drive the optical fiber to deform together to generate optical fiber transmission loss.
The sensing optical fiber is reinforced by secondary coating, so that the strength and elasticity of the bare fiber are improved, and the input end and the output end are fixed on the shell; when the well lid is in a normal state, the bending radius of the sensing optical fiber is larger than 4 cm, at the moment, the attenuation of an optical signal through the optical fiber is very weak, and the monitoring equipment does not generate an alarm action on the point; when the well lid state is abnormal, the sensing optical fiber generates small-radius bending under the drive of the optical fiber resetting and traction device, the radius is smaller than 4 cm, at the moment, the optical signal attenuation through the optical fiber can be increased sharply, and the monitoring equipment generates an alarm action for the point.
The optical fiber traction device can drive the optical fiber to deform and consists of an upper traction body, a lower traction body and a base plate; when the well lid is in a normal state, the optical fiber traction device is in a compressed state, and the upper traction body drives the sensing optical fiber to return to a normal position; when the well lid state is abnormal, the lower traction body is driven by the elastic reset device to drive the traction device substrate to move upwards, and the optical fiber generates small-radius bending under the compression of the lower traction body and the shell.
The connection flange adopts the FC-UPC optical fiber connection flange with smaller transmission attenuation, so that the connection and the use of the sensor are facilitated, when the on-site welding is convenient, the flange connection can be omitted, and at the moment, the cost can be saved, and the flange connection is omitted.
Compared with the existing well lid anti-theft sensor, the well lid anti-theft sensor based on the optical fiber technology not only improves the stability and safety of the system, but also greatly reduces the cost of the whole well lid safety monitoring system, and simultaneously improves the maintainability of the system.
The well lid can not be timely determined and repaired after being lost, and safe affliction is easily caused.
In one embodiment, the well cover anti-theft sensor is realized based on optical fiber technology and is combined with an optical fiber time domain reflectometer (OTDR), an anti-theft sensor, a connecting optical cable and the like. As shown in fig. 3-4, when the corresponding well lid is lost, the optical signal passing through the corresponding sensor is attenuated and dropped, and when the optical fiber time domain reflectometer (OTDR) tests the attenuated signal of the point, the corresponding distance information is output to the municipal administration management platform, and the management platform determines the position of the lost well lid on the map according to the corresponding distance. The prompt gives related personnel to go to the disposal, and the stolen well lid can be timely repaired, so that the safety affliction is rapidly solved, and accidents are prevented. The anti-theft problem of the well cover is broken through in the technical aspect.
A well cover anti-theft sensor based on optical fiber technology is provided. The theory and practice prove that compared with the traditional well lid sensor, the well lid sensor has the following characteristics:
1. the existing well lid anti-theft sensor is realized based on vibration sensors, angle sensors and other electrical sensors; the cost is tens or even hundreds of times of that of the optical fibers, the optical fibers cannot be used in a large quantity, and the number of the well covers is huge, so that the cost of the well cover anti-theft sensor realized by adopting the optical fiber technology can be greatly reduced, and the technology popularization is facilitated.
2. The current electric method sensor needs to be powered on site, and is generally powered by a battery; the optical fiber well lid sensor does not need power supply, and the optical path can be intensively measured after being communicated, because the transmission loss of light in the optical fiber is extremely small and only 0.2-0.4dB/km per kilometer; but one percent of the metallic material.
3. The method is convenient for multiplexing and easy for realizing distributed measurement. The optical fiber has the advantages of no need of power supply, long transmission distance and easy layout, and can directly form an optical fiber sensing network.
When using the electrical sensor, the information of all sensors must be networked by wire or wireless; when the optical fiber sensor is used, the optical path is an information link, and the network can be formed by itself without a special wired and wireless network. Thus the construction and use costs can be greatly reduced.
4. The sensing optical fiber is glass (silicon dioxide) and has stable chemical characteristics, so that the sensing optical fiber can be used for a long time, and the maintenance cost of the system is greatly reduced.
5. Anti-electromagnetic interference, electric insulation, corrosion resistance and safety. The optical fiber sensor adopts an optical signal as a transmission medium, is not influenced by electromagnetic signals, and is resistant to corrosion, so that the optical fiber sensor can be conveniently and effectively used in various severe environments, and is particularly suitable for high-humidity environments such as underground pipelines.
In the description of the present application, it should be understood that the terms "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like indicate orientations or positional relationships based on the orientations or positional relationships illustrated in the drawings, merely to facilitate description of the present application and simplify the description, and do not indicate or imply that the devices or elements being referred to must have a specific orientation, be configured and operated in a specific orientation, and are not to be construed as limiting the present application.
The foregoing describes specific embodiments of the present invention. It is to be understood that the invention is not limited to the particular embodiments described above, and that various changes or modifications may be made by those skilled in the art within the scope of the appended claims without affecting the spirit of the invention. The embodiments of the present application and features in the embodiments may be combined with each other arbitrarily without conflict.
Claims (3)
1. Well lid theftproof sensor based on optical fiber technology realizes, its characterized in that includes: the optical fiber sensor comprises a shell (1), a sensing optical fiber (2), an optical fiber traction component (3), a resetting device (4) and a wiring flange (5);
the shell (1) is arranged on the outer layer of the well lid anti-theft sensor realized based on the optical fiber technology;
the sensing optical fiber (2) is arranged in the shell (1);
the optical fiber traction component (3) and the sensing optical fiber (2);
the resetting device (4) is arranged in the optical fiber traction component (3);
the wiring flange (5) is connected with the sensing optical fiber (2);
further comprises: a sensor;
the housing (1) is capable of restraining the sensing optical fiber (2);
the housing (1) is capable of holding a sensor;
the size of the shell (1) is larger than the minimum loss diameter of the sensing optical fiber (2);
the sensing optical fiber (2) adopts an optical fiber reinforced by secondary coating;
the resetting device (4) adopts any one of the following: a step of
-a spring;
-an elastic assembly of plastic structural members;
the optical fiber traction component (3) can drive the sensing optical fiber (2) to deform;
the optical fiber pulling member (3) includes: an upper traction body, a lower traction body and a base plate;
when the well lid is in a normal state, the optical fiber traction component (3) is in a compressed state, and the upper traction body drives the sensing optical fiber (2) to return to a normal position; when the well lid is abnormal, the lower traction body is driven by the elastic reset device (4) to drive the traction device substrate to move upwards, and the sensing optical fiber (2) generates small-radius bending under the compression of the lower traction body and the shell (1);
when the well lid is in a normal state, the bending radius of the sensing optical fiber (2) is larger than 4 cm, and alarm-free result information is obtained;
when the well lid is in an abnormal state, the sensing optical fiber (2) is driven by the optical fiber traction component (3) and the resetting device (4) to generate radius bending with a threshold value smaller than a set threshold value, and the bending radius of the sensing optical fiber (2) is smaller than 4 cm to acquire alarm result information;
when the corresponding well lid is lost, the optical signal passing through the corresponding well lid anti-theft sensor is attenuated and falls, and when the optical fiber time domain reflectometer tests the attenuation signal of the point, the optical fiber time domain reflectometer outputs corresponding distance information to the municipal administration management platform, and the management platform determines the position of the lost well lid on the map according to the corresponding distance.
2. The manhole cover theft protection sensor implemented based on optical fiber technology according to claim 1, characterized in that the connection flange (5) comprises: sensor input optical fiber connecting component and sensor output optical fiber connecting component;
the sensor input optical fiber connecting component is connected with the sensing optical fiber (2);
the sensor output optical fiber connecting component is connected with the sensing optical fiber (2).
3. The manhole cover theft prevention sensor implemented based on the optical fiber technology according to claim 1, wherein the connection flange (5) adopts an FC-UPC optical fiber connection flange.
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| CN202011566400.0A CN112729523B (en) | 2020-12-25 | 2020-12-25 | Well lid anti-theft sensor based on optical fiber technology |
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| CN104848783A (en) * | 2014-02-15 | 2015-08-19 | 西安金和光学科技有限公司 | Sensing device, and box body position state monitoring system and method employing same |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
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| JP2914295B2 (en) * | 1996-05-16 | 1999-06-28 | 住友電気工業株式会社 | Lid opening / closing monitoring method and device used therefor |
| CN2643296Y (en) * | 2003-08-07 | 2004-09-22 | 江苏法尔胜技术开发中心 | Optical Fiber vibration sensor |
| US8428400B2 (en) * | 2009-08-20 | 2013-04-23 | Polytechnic Institute Of New York University | Fiber-optic extensometer |
| CN102542731A (en) * | 2010-12-07 | 2012-07-04 | 西安金和光学科技有限公司 | Debris flow earth sound monitoring alarm device |
| CN203838833U (en) * | 2014-05-26 | 2014-09-17 | 广东复安科技发展有限公司 | City pipe network intrusion prevention alarm device based on optical fiber sensing |
| CN105155587A (en) * | 2015-09-17 | 2015-12-16 | 成都易信达科技股份有限公司 | Manhole cover weight measuring anti-theft system |
| CN105509778A (en) * | 2015-12-24 | 2016-04-20 | 浙江中电智能科技有限公司 | Remote optical fiber door cover switch monitoring system |
| CN109243123A (en) * | 2018-08-31 | 2019-01-18 | 北京百世通管道科技有限公司 | A kind of well lid status real time monitor early warning system and method |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH1082621A (en) * | 1996-09-10 | 1998-03-31 | Chubu Electric Power Co Inc | Fiber-optic displacement sensor |
| CN104848783A (en) * | 2014-02-15 | 2015-08-19 | 西安金和光学科技有限公司 | Sensing device, and box body position state monitoring system and method employing same |
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