CN102095437A - Real-time positioning and detection system for train by intensive fiber grating group - Google Patents
Real-time positioning and detection system for train by intensive fiber grating group Download PDFInfo
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- CN102095437A CN102095437A CN201110004583.1A CN201110004583A CN102095437A CN 102095437 A CN102095437 A CN 102095437A CN 201110004583 A CN201110004583 A CN 201110004583A CN 102095437 A CN102095437 A CN 102095437A
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Abstract
The invention discloses a real-time positioning and detection system for a train by an intensive fiber grating group. A broadband light source (1) of the system is connected with a first port (21) of a three-port coupler; a second port (22) of the three-port coupler is connected with a sensing fiber grating array (3); a third port (23) of the three-port coupler is connected with one end of a tunable filter (4); and the other of the tunable filter (4) is connected with a photoelectric detector (5). The sensing fiber grating array (3) consists of a first sending head, ..., and a nth sending head which are connected in series, wherein n is more than or equal to 1; each sensing head consists of k fiber gratings with different center wavelengths, wherein k is more than or equal to 2. The center wavelengths of the fiber gratings on the first sending head to the nth sending head are coincident; and in the first sending head to the nth sending head, the reflection rates of k fiber gratings in any two sensing heads are incompletely identical. When the number of the reflection rates of k fiber gratings in each sensing head is m, the number n of the sensing heads is equal to mk. The system is simple in structure and low in cost, and can monitor the train in a long distance and large range.
Description
Technical field
The present invention relates to strength fibers grating group train real-time positioning detection system, be applicable to fields such as optical fiber sensing technology, civil engineering, track traffic.
Background technology
In recent years open, along with Chinese economic development, high-speed railway has obtained vigorous growth in China, and passenger traffic high speed and shipping heavy loading have become 2 important development directions of current high-speed railway transportation.The characteristics of high-speed railway are that road speed is fast, rate of traffic flow is big, the interactions of train operation rule, performance and environment thereof etc. and ordinary train have difference in essence, huge and the railway line of its kinetic energy adopts full-overpassization and totally-enclosedization, in case have an accident, will form huge destructive power, the consequence that causes also can be very serious.Therefore, ensure that running train moves the key issue that becomes railway development safely and effectively.And which place is the key that ensures train safe just be to monitor out in advance dangerous situation has taken place, and we just need position monitoring to the real time execution situation of train like this.
In recent years, sensor is developing towards sensitive, accurate, strong, the small and exquisite and intelligentized direction of adaptability.In this course, the newcomer of this sensor family of Fibre Optical Sensor gains great popularity.Optical fiber has the performance of a lot of excellences, for example: the performance of anti-electromagnetic interference (EMI) and atomic radiation, the footpath is thin, soft, the lightweight mechanical property of matter; Insulation, inductionless electric property; Water-fast, high temperature resistant, corrosion resistant chemical property etc., thereby Fibre Optical Sensor has widely than other sensors and uses.At present, most widely used is distributed optical fiber sensing system, and the sensing technology that these distributed optical fiber sensing systems adopt mainly is based on the distributed sensing of Raman scattering and based on the distributed sensing of Brillouin scattering.But the acceptance of these sensing technology signals is difficulty relatively, and Measuring Time is long, and Signal Processing is very complicated, and the overall cost of system is also relatively more expensive.
Fiber-optic grating sensor also has some obviously to be better than the place of other Fibre Optical Sensors except the many advantages with Fibre Optical Sensor.The influence of factors such as it is the device as a kind of spectral separation and optical wavelength selection, and not loss by bending of signal, junction loss, light source rise and fall and detector wears out; Problems such as the interferometric optical fiber sensor phase measurement is smudgy have been avoided; The information of several measurement target can be obtained simultaneously, and quasi-distributed measurement can be realized.Since in the practical application on a large scale, the needs of big monitoring distance, often need jumbo monitoring system.Traditional fiber grating sensing and monitoring system is to utilize single fiber grating as sensing head, because the restriction of light source bandwidth, the sensing head that makes whole sensor-based system to connect like this is limited, can not satisfy the needs of practical application.High capacity encoding optic fiber grating sensing and monitoring system, CN200310111529.2 has proposed a kind of large-capacity fiber grating sensing and monitoring system, but the wavelength of monochromatic light grid is all inequality in its sensor fibre grating array, makes trouble relatively; Measurement range is big more, and needed sensing head quantity is many more, and its coded system is also complicated relatively more; Adopted two light sources, two Y type shunts, two detuners, the overall cost of system is relatively more expensive.
Summary of the invention
Technical matters to be solved by this invention provides practicality simple in structure in, easy to make, cheap and the big strength fibers grating group train real-time positioning detection system of measurement range.
Technical scheme of the present invention:
A kind of strength fibers grating group train real-time positioning detection system, the output of the wideband light source of this system connects first port of three port coupler, second port of three port coupler connects the sensor fibre grating array, the 3rd port of three port coupler connects an end of adjustable filter, another termination photodetector of adjustable filter.
The sensor fibre grating array by first sensing head, second sensing head ..., the n sensing head composition that is connected in series, n 〉=1; Each sensing head is formed k 〉=2 by k the different fiber grating of centre wavelength.
First the centre wavelength unanimity of fiber grating to the n sensing head, the reflectivity of k fiber grating is similar and different on each sensing head; First to the n sensing head, and the reflectivity of k fiber grating in any two sensing heads is incomplete same.
When the reflectivity value number of k fiber grating is m in each sensing head, the quantity n=m of sensing head
k
Beneficial effect of the present invention: the strength fibers grating group train real-time positioning detection system that the present invention proposes, simple in structure, be easy to realize; Only need adjustable filter fire to take place near just can judging sensing point, do not need high demodulated equipment, low price, cost performance height; Adopt many fiber gratings to make sensing heads, the fiber grating centre wavelength unanimity of each sensing head correspondence, reflectivity difference have increased the capacity of sensor-based system, can realize long distance, the large-scale monitoring.
Description of drawings
Fig. 1 strength fibers grating group train real-time positioning detection system synoptic diagram.
Embodiment
Below in conjunction with accompanying drawing the present invention is further described.
Embodiment one, and present embodiment 1 is elaborated in conjunction with the accompanying drawings.
A kind of strength fibers grating group train real-time positioning detection system, the output of the wideband light source 1 of this system connects first port 21 of three port coupler, second port 22 of three port coupler connects sensor fibre grating array 3, the 3rd port 23 of three port coupler connects an end of adjustable filter 4, another termination photodetector 5 of adjustable filter 4.
Sensor fibre grating array 3 by first sensing head 31, second sensing head 32 ..., the 9th sensing head 39 composition that is connected in series; Each sensing head is made up of two different fiber gratings of centre wavelength.
First the centre wavelength unanimity of fiber grating to the n sensing head, the reflectivity of k fiber grating is similar and different on each sensing head; In first to the 9th sensing head, the reflectivity of k fiber grating in any two sensing heads is not exclusively together individual.
The centre wavelength of first fiber grating and reflectivity are respectively 1550.1nm in first sensing head, and 1%; The centre wavelength and the reflectivity of second fiber grating are respectively 1550.5nm, 1%.
The centre wavelength of first fiber grating and reflectivity are respectively 1550.1nm in second sensing head, and 50%; The centre wavelength and the reflectivity of second fiber grating are respectively 1550.5nm, 50%.
The centre wavelength of first fiber grating and reflectivity are respectively 1550.1nm in the 3rd sensing head, and 50%; The centre wavelength and the reflectivity of second fiber grating are respectively 1550.5nm, 99%.
The centre wavelength of first fiber grating and reflectivity are respectively 1550.1nm in the 4th sensing head, and 99%; The centre wavelength and the reflectivity of second fiber grating are respectively 1550.5nm, 50%.
The centre wavelength of first fiber grating and reflectivity are respectively 1550.1nm in the 5th sensing head, and 99%; The centre wavelength and the reflectivity of second fiber grating are respectively 1550.5nm, 99%.
The centre wavelength of first fiber grating and reflectivity are respectively 1550.1nm in the 6th sensing head, and 1%; The centre wavelength and the reflectivity of second fiber grating are respectively 1550.5nm, 50%.
The centre wavelength of first fiber grating and reflectivity are respectively 1550.1nm in the 7th sensing head, and 50%; The centre wavelength and the reflectivity of second fiber grating are respectively 1550.5nm, 1%.
The centre wavelength of first fiber grating and reflectivity are respectively 1550.1nm in the 8th sensing head, and 99%; The centre wavelength and the reflectivity of second fiber grating are respectively 1550.5nm, 1%.
The centre wavelength of first fiber grating and reflectivity are respectively 1550.1nm in the 9th sensing head, and 1%; The centre wavelength and the reflectivity of second fiber grating are respectively 1550.5nm, 99%.
The centre wavelength of first and second fiber gratings in the present embodiment is respectively 1550.1nm and 1550.5nm; The first and second fiber grating reflectivity have three different values 1%, 50%, 99%.
The sensing head number of present embodiment is n=m
k=3
2=9, wherein m is a reflectivity value number, and k is the number of fiber grating on each sensing head.
Embodiment two, and present embodiment 1 is elaborated in conjunction with the accompanying drawings.
A kind of strength fibers grating group train real-time positioning detection system, the output of the wideband light source 1 of this system connects first port 21 of three port coupler, second port 22 of three port coupler connects sensor fibre grating array 3, the 3rd port 23 of three port coupler connects an end of adjustable filter 4, another termination photodetector 5 of adjustable filter 4.
Sensor fibre grating array 3 by first sensing head 31, second sensing head 32 ..., the 27 sensing head 327 composition that is connected in series; Each sensing head is made up of three different fiber gratings of centre wavelength.
The centre wavelength of first fiber grating and reflectivity are respectively 1551.8nm in first sensing head, and 5%; The centre wavelength and the reflectivity of second fiber grating are respectively 1552.0nm, 5%; The centre wavelength and the reflectivity of the 3rd fiber grating are respectively 1552.2nm, 5%.
The centre wavelength of first fiber grating and reflectivity are respectively 1551.8nm in second sensing head, and 45%; The centre wavelength and the reflectivity of second fiber grating are respectively 1552.0nm, 45%; The centre wavelength and the reflectivity of the 3rd fiber grating are respectively 1552.2nm, 45%.
The centre wavelength of first fiber grating and reflectivity are respectively 1551.8nm in the 3rd sensing head, and 45%; The centre wavelength and the reflectivity of second fiber grating are respectively 1552.0nm, 45%; The centre wavelength and the reflectivity of the 3rd fiber grating are respectively 1552.2nm, 80%.
The centre wavelength of first fiber grating and reflectivity are respectively 1551.8nm in the 4th sensing head, and 45%; The centre wavelength and the reflectivity of second fiber grating are respectively 1552.0nm, 80%; The centre wavelength and the reflectivity of the 3rd fiber grating are respectively 1552.2nm, 80%.
The centre wavelength of first fiber grating and reflectivity are respectively 1551.8nm in the 5th sensing head, and 45%; The centre wavelength and the reflectivity of second fiber grating are respectively 1552.0nm, 80%; The centre wavelength and the reflectivity of the 3rd fiber grating are respectively 1552.2nm, 45%.
The centre wavelength of first fiber grating and reflectivity are respectively 1551.8nm in the 6th sensing head, and 80%; The centre wavelength and the reflectivity of second fiber grating are respectively 1552.0nm, 45%; The centre wavelength and the reflectivity of the 3rd fiber grating are respectively 1552.2nm, 45%.
The centre wavelength of first fiber grating and reflectivity are respectively 1551.8nm in the 7th sensing head, and 80%; The centre wavelength and the reflectivity of second fiber grating are respectively 1552.0nm, 80%; The centre wavelength and the reflectivity of the 3rd fiber grating are respectively 1552.2nm, 45%.
The centre wavelength of first fiber grating and reflectivity are respectively 1551.8nm in the 8th sensing head, and 80%; The centre wavelength and the reflectivity of second fiber grating are respectively 1552.0nm, 45%; The centre wavelength and the reflectivity of the 3rd fiber grating are respectively 1552.2nm, 80%.
The centre wavelength of first fiber grating and reflectivity are respectively 1551.8nm in the 9th sensing head, and 80%; The centre wavelength and the reflectivity of second fiber grating are respectively 1552.0nm, 80%; The centre wavelength and the reflectivity of the 3rd fiber grating are respectively 1552.2nm, 80%.
The centre wavelength of first fiber grating and reflectivity are respectively 1551.8nm in the tenth sensing head, and 5%; The centre wavelength and the reflectivity of second fiber grating are respectively 1552.0nm, 5%; The centre wavelength and the reflectivity of the 3rd fiber grating are respectively 1552.2nm, 45%.
The centre wavelength of first fiber grating and reflectivity are respectively 1551.8nm in the 11 sensing head, and 45%; The centre wavelength and the reflectivity of second fiber grating are respectively 1552.0nm, 45%; The centre wavelength and the reflectivity of the 3rd fiber grating are respectively 1552.2nm, 5%.
The centre wavelength of first fiber grating and reflectivity are respectively 1551.8nm in the 12 sensing head, and 45%; The centre wavelength and the reflectivity of second fiber grating are respectively 1552.0nm, 80%; The centre wavelength and the reflectivity of the 3rd fiber grating are respectively 1552.2nm, 5%.
The centre wavelength of first fiber grating and reflectivity are respectively 1551.8nm in the 13 sensing head, and 80%; The centre wavelength and the reflectivity of second fiber grating are respectively 1552.0nm, 45%; The centre wavelength and the reflectivity of the 3rd fiber grating are respectively 1552.2nm, 5%.
The centre wavelength of first fiber grating and reflectivity are respectively 1551.8nm in the 14 sensing head, and 80%; The centre wavelength and the reflectivity of second fiber grating are respectively 1552.0nm, 80%; The centre wavelength and the reflectivity of the 3rd fiber grating are respectively 1552.2nm, 5%.
The centre wavelength of first fiber grating and reflectivity are respectively 1551.8nm in the 15 sensing head, and 5%; The centre wavelength and the reflectivity of second fiber grating are respectively 1552.0nm, 5%; The centre wavelength and the reflectivity of the 3rd fiber grating are respectively 1552.2nm, 80%.
The centre wavelength of first fiber grating and reflectivity are respectively 1551.8nm in the 16 sensing head, and 5%; The centre wavelength and the reflectivity of second fiber grating are respectively 1552.0nm, 45%; The centre wavelength and the reflectivity of the 3rd fiber grating are respectively 1552.2nm, 5%.
The centre wavelength of first fiber grating and reflectivity are respectively 1551.8nm in the 17 sensing head, and 45%; The centre wavelength and the reflectivity of second fiber grating are respectively 1552.0nm, 5%; The centre wavelength and the reflectivity of the 3rd fiber grating are respectively 1552.2nm, 45%.
The centre wavelength of first fiber grating and reflectivity are respectively 1551.8nm in the 18 sensing head, and 45%; The centre wavelength and the reflectivity of second fiber grating are respectively 1552.0nm, 5%; The centre wavelength and the reflectivity of the 3rd fiber grating are respectively 1552.2nm, 80%.
The centre wavelength of first fiber grating and reflectivity are respectively 1551.8nm in the 19 sensing head, and 80%; The centre wavelength and the reflectivity of second fiber grating are respectively 1552.0nm, 5%; The centre wavelength and the reflectivity of the 3rd fiber grating are respectively 1552.2nm, 45%.
The centre wavelength of first fiber grating and reflectivity are respectively 1551.8nm in the 20 sensing head, and 80%; The centre wavelength and the reflectivity of second fiber grating are respectively 1552.0nm, 5%; The centre wavelength and the reflectivity of the 3rd fiber grating are respectively 1552.2nm, 80%.
The centre wavelength of first fiber grating and reflectivity are respectively 1551.8nm in the 21 sensing head, and 5%; The centre wavelength and the reflectivity of second fiber grating are respectively 1552.0nm, 45%; The centre wavelength and the reflectivity of the 3rd fiber grating are respectively 1552.2nm, 5%.
The centre wavelength of first fiber grating and reflectivity are respectively 1551.8nm in the 22 sensing head, and 45%; The centre wavelength and the reflectivity of second fiber grating are respectively 1552.0nm, 5%; The centre wavelength and the reflectivity of the 3rd fiber grating are respectively 1552.2nm, 5%.
The centre wavelength of first fiber grating and reflectivity are respectively 1551.8nm in the 23 sensing head, and 80%; The centre wavelength and the reflectivity of second fiber grating are respectively 1552.0nm, 5%; The centre wavelength and the reflectivity of the 3rd fiber grating are respectively 1552.2nm, 5%.
The centre wavelength of first fiber grating and reflectivity are respectively 1551.8nm in the 24 sensing head, and 5%; The centre wavelength and the reflectivity of second fiber grating are respectively 1552.0nm, 45%; The centre wavelength and the reflectivity of the 3rd fiber grating are respectively 1552.2nm, 80%.
The centre wavelength of first fiber grating and reflectivity are respectively 1551.8nm in the 25 sensing head, and 5%; The centre wavelength and the reflectivity of second fiber grating are respectively 1552.0nm, 80%; The centre wavelength and the reflectivity of the 3rd fiber grating are respectively 1552.2nm, 5%.
The centre wavelength of first fiber grating and reflectivity are respectively 1551.8nm in the 26 sensing head, and 5%; The centre wavelength and the reflectivity of second fiber grating are respectively 1552.0nm, 80%; The centre wavelength and the reflectivity of the 3rd fiber grating are respectively 1552.2nm, 45%.
The centre wavelength of first fiber grating and reflectivity are respectively 1551.8nm in the 27 sensing head, and 5%; The centre wavelength and the reflectivity of second fiber grating are respectively 1552.0nm, 80%; The centre wavelength and the reflectivity of the 3rd fiber grating are respectively 1552.2nm, 80%.
The centre wavelength of first, second in the present embodiment and the 3rd fiber grating is respectively 1551.8nm, 1552.0nm and 1552.2nm; The first and second fiber grating reflectivity have three different values 5%, 45%, 80%.
The sensing head number of present embodiment is n=m
k=3
3=27, wherein m is a reflectivity value number, and k is the number of fiber grating on each sensing head.
Size according to the scope of required measurement is selected the number of fiber grating on each sensing head and the value number of fiber grating reflectivity.
The light that the wideband light source 1 of strength fibers grating group train real-time positioning detection system sends advanced three port coupler 2 and entered sensor fibre grating array 3; The signal that sensor fibre grating array 3 reflects enters adjustable filter 4.A plurality of fiber gratings are encoded to the temperature of institute's measuring point on each sensing head, the wavelength of adjustable filter 4 is set at certain value by the fire alarm requirement, under normal circumstances, the wavelength of the fiber grating correspondence on the sensing head is less than the filter wavelength of adjustable filter 4, the unglazed output of the output port of adjustable filter 4; When the temperature at any measurement point place raises, this measurement point is caused the centre wavelength of k fiber grating of this measurement point changes.In case when the measurement point environment temperature reached set alarm set point, the centre wavelength of the k of this a measurement point fiber grating was identical with the filter wavelength that adjustable filter is provided with, adjustable filter 4 has light output, and photodetector 5 detects light signal.Because the reflectivity of the pairing k of each a sensing head fiber grating is incomplete same, when track is caused danger situation, how much judging of the power signal of being accepted according to photodetector 5 is near which sensing head danger to have taken place, and train is carried out real-time positioning.
Device used in the present invention is commercially available device.
Claims (3)
1. strength fibers grating group train real-time positioning detection system, the output of the wideband light source of this system (1) connects first port (21) of three port coupler, second port (22) of three port coupler connects sensor fibre grating array (3), the 3rd port (23) of three port coupler connects an end of adjustable filter (4), another termination photodetector (5) of adjustable filter (4); It is characterized in that:
Sensor fibre grating array (3) by first sensing head (31), second sensing head (32) ..., n sensing head (3n) composition that is connected in series, n 〉=1; Each sensing head is formed k 〉=2 by k the different fiber grating of centre wavelength.
2. strength fibers grating group train real-time positioning detection system according to claim 1 is characterized in that:
First the centre wavelength unanimity of fiber grating to the n sensing head, the reflectivity of k fiber grating is similar and different on each sensing head; First to the n sensing head, and the reflectivity of k fiber grating in any two sensing heads is incomplete same.
3. strength fibers grating group train real-time positioning detection system according to claim 1 is characterized in that:
When the reflectivity value number of k fiber grating was m in each sensing head, the quantity of sensing head was n=m
k
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102798492A (en) * | 2012-08-30 | 2012-11-28 | 西安科技大学 | Fiber bragg grating detection system device and method for detecting anchoring force of anchor rod |
| CN109387756A (en) * | 2018-12-13 | 2019-02-26 | 云南电网有限责任公司电力科学研究院 | A kind of partial discharge detecting system and method based on fiber grating |
| CN109813350A (en) * | 2019-01-14 | 2019-05-28 | 中车青岛四方机车车辆股份有限公司 | A kind of high-speed magnetic floating novel optical fiber positioning system |
| CN113715873A (en) * | 2021-08-27 | 2021-11-30 | 山东轨道交通研究院有限公司 | phi-OTDR dynamic nano-strain real-time positioning system of urban rail transit train |
| CN114659612A (en) * | 2022-03-16 | 2022-06-24 | 武汉理工大学 | Rail transit train positioning system and method based on fiber bragg grating array |
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| CN113715873A (en) * | 2021-08-27 | 2021-11-30 | 山东轨道交通研究院有限公司 | phi-OTDR dynamic nano-strain real-time positioning system of urban rail transit train |
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Application publication date: 20110615 |