CN110562293B - Safe rail transit axle counting system and method based on edge filtering - Google Patents
Safe rail transit axle counting system and method based on edge filtering Download PDFInfo
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- CN110562293B CN110562293B CN201910911073.9A CN201910911073A CN110562293B CN 110562293 B CN110562293 B CN 110562293B CN 201910911073 A CN201910911073 A CN 201910911073A CN 110562293 B CN110562293 B CN 110562293B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B61—RAILWAYS
- B61L—GUIDING RAILWAY TRAFFIC; ENSURING THE SAFETY OF RAILWAY TRAFFIC
- B61L1/00—Devices along the route controlled by interaction with the vehicle or vehicle train, e.g. pedals
- B61L1/16—Devices for counting axles; Devices for counting vehicles
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B61—RAILWAYS
- B61L—GUIDING RAILWAY TRAFFIC; ENSURING THE SAFETY OF RAILWAY TRAFFIC
- B61L1/00—Devices along the route controlled by interaction with the vehicle or vehicle train, e.g. pedals
- B61L1/16—Devices for counting axles; Devices for counting vehicles
- B61L1/163—Detection devices
- B61L1/166—Optical
Abstract
The invention discloses a safe rail transit axle counting system based on edge filtering, which comprises a fiber bragg grating sensor group and a demodulator, wherein the fiber bragg grating sensor group comprises a first fiber bragg grating sensor, a second fiber bragg grating sensor and a third fiber bragg grating sensor, the first fiber bragg grating sensor, the second fiber bragg grating sensor and the third fiber bragg grating sensor are respectively bonded with corresponding strain gauges, the three strain gauges are bonded on a rail waist, and the first fiber bragg grating sensor, the second fiber bragg grating sensor and the third fiber bragg grating sensor are positioned on the same straight line; the demodulator adopts a 2x 2-2 redundancy structure; the invention can effectively improve the accuracy and reliability of the axle counting function of the train and can realize the functions of judging the running direction of the train, performing system self-checking and the like.
Description
Technical Field
The invention relates to the technical field of rail transportation safety monitoring, in particular to a safe rail transportation axle counting system and method based on edge filtering.
Background
After years of development, railway transportation technology has great influence on application fields and coverage areas. More stringent requirements are placed on the safety of rail transport. At present, two main ways of track axle counting are provided, namely an electric axle counting scheme, a magnetic axle counting scheme and a fiber grating axle counting scheme.
The track circuit mainly forms an electric loop by an axle and a track, is a device consisting of a conductor, a steel rail insulator, a power transmission device, a power receiving device and a current limiting resistor, and is used for judging whether a train occupies an interval to be detected. The electromagnetic axle counter realizes axle counting, and a transmitting coil and an induction coil are respectively arranged on two sides of a track, so that an axle counting point is positioned in a magnetic field. When the train passes through the axle counting point, the induced electromotive force on the induction coil is changed relative to the induced electromotive force without wheels, so that the train passes through the axle counting point, the axle counting is realized, and the function of monitoring the occupation of the track is realized.
In summary, the track circuit and the electromagnetic axle counter must be implemented with equipment disposed outdoors and highly dependent on their excellent electrical transmission characteristics.
In the article of 'analysis of influence of lightning stroke on track circuit' (classification number of middle drawing: U284.2), it is proposed that particularly in thunderstorm seasons, the lightning stroke is easy to damage equipment, so that traffic and transportation are greatly influenced, trains cannot run safely, and serious accidents can be caused in severe cases. In the article of research on common interference sources and anti-interference methods of electromagnetic induction type axle counting equipment (classification number of middle drawing: U284.47), it is proposed that most of the interference faults of the axle counting equipment of state railways are caused by electromagnetic interference such as lightning damage, surge, overvoltage and the like. Although the domestic introduction of axle counting technology has been more than 10 years old and is applied to a large area in a plurality of railway offices, the problem of electromagnetic interference is still not effectively solved.
Since its birth, the fiber grating sensing technology has the characteristics of electrical insulation, electromagnetic interference resistance, corrosion resistance, strong chemical stability, long distance and the like, and is widely applied to environments with strong electromagnetic interference and variable humidity. And the axle counting product developed based on the fiber bragg grating does not need to place electromagnetic sensitive equipment in an outdoor environment, so that the problems of the electrical equipment can be avoided, and the product is not fatigued to cope with the influences of electromagnetic interference and the like of an application scene.
Utility model patent CN200920088856.3 discloses a train meter axle and judgement scheme based on two independent fiber grating sensors. When the train is rolled on the two fiber grating sensors in sequence, the wavelength drift values of the two sensors respectively generate a pulse at adjacent moments, and the train running direction is judged according to the coming sequence of the pulses. The disadvantage of this solution is that the driving direction can only be determined by sorting the first pulse measured by the two fiber gratings. If the first pulse comes in wrong order, the system may obtain wrong driving direction, and the rail transportation safety is seriously affected. According to the invention patent CN201610956103.4, two fiber gratings are adhered to two surfaces of a strain gauge, and then the strain gauge is integrally fixed at the bottom of a rail, so that when a train comes, the wavelength changes of the two fiber gratings are in the opposite directions, and the effect of sensitization can be achieved. And because the two fiber gratings are in the same temperature environment, the temperature influence can be mutually compensated and eliminated. The method adopts a mechanical structure as a whole, takes a spring as one of main devices for strain transmission, and is easy to displace along with the vibration of the track to generate noise. And the track is easy to generate high-frequency vibration, and the mechanical structure used in the scene for a long time is easy to age, thus threatening the transportation safety of the track.
The optical path and circuit described in the above-mentioned patent are all single-path data transmission and processing, and the safety performance is limited.
Disclosure of Invention
The invention aims to provide a safe rail transit axle counting system and method based on edge filtering, which can effectively improve the safety of rail transit axle counting functions and can realize the functions of train driving direction judgment, system self-checking and the like.
In order to achieve the purpose, the invention designs a safe rail transit axle counting system based on edge filtering, which is characterized in that: the fiber grating sensor group comprises a first fiber grating sensor, a second fiber grating sensor and a third fiber grating sensor, wherein the first fiber grating sensor, the second fiber grating sensor and the third fiber grating sensor are respectively bonded with corresponding strain gauges, the three strain gauges are bonded on a rail waist, and the first fiber grating sensor, the second fiber grating sensor and the third fiber grating sensor are positioned on the same straight line;
the demodulator comprises a light source control panel, an ASE light source (amplified spontaneous emission light source), a one-to-two coupler A, a broadband filter, a first photoelectric converter, a one-to-three coupler, an optical circulator, a one-to-two coupler B, a first linear filter, a second photoelectric converter, a main control panel and a one-to-two coupler C;
the light source control panel is used for controlling the ASE light source to output continuous light in a C wave band, the continuous light in the C wave band is divided into two paths by the one-to-two coupler A, the continuous light in one path of the C wave band is transmitted to the first photoelectric converter through the broadband filter to be converted into an electric signal, the light source control panel is used for carrying out self-checking on the light source, and the continuous light in the other path of the C wave band is sequentially transmitted to the first fiber bragg grating sensor, the second fiber bragg grating sensor and the third fiber bragg grating sensor through the one-to-three coupler and the optical circulator;
the gratings in the first fiber grating sensor, the second fiber grating sensor and the third fiber grating sensor respectively modulate the light intensity corresponding to the gratings in the wavelength of the continuous light in the C waveband, when a train passes through and strain is transmitted to the fiber grating sensor group through a rail, the central wavelength of the reflected light of the gratings deviates, and the reflected light intensity of the continuous light in the C waveband regularly changes;
three beams of reflected light output by the first fiber grating sensor, the second fiber grating sensor and the third fiber grating sensor respectively pass through the optical circulator, the one-to-two coupler B and the one-to-two coupler C in sequence and then are divided into two paths, one path of reflected light is subjected to edge filtering modulation by the first linear filter to obtain a reflected light modulation signal, the light intensity of the reflected light modulation signal is in direct proportion to the strain magnitude, the second photoelectric converter converts three reflected light modulation signals corresponding to the three fiber grating sensors into corresponding three reflected light modulation electrical signals, the other path of reflected light directly enters the second photoelectric converter, and the second photoelectric converter converts the reflected light emitted by the three fiber grating sensors into three reflected light reference electrical signals;
the main control board makes the ratio of the three reflected light modulation electric signals and the corresponding three reflected light reference electric signals to obtain three ratio electric signals, the wavelength values corresponding to the three fiber grating sensors at the moment are analyzed through the three ratio electric signals, then the strain values of the three fiber grating sensors at the moment are demodulated, and the train axle counting is carried out according to the strain signals of the three fiber grating sensors and the sequence of the strain signals when the train comes.
A rail transit axle counting method using the system comprises the following steps:
step 1: the light source control panel controls the ASE light source to output continuous light in a C wave band, the continuous light in the C wave band is divided into two paths by the one-to-two coupler A, the continuous light in one path of the C wave band is transmitted to the first photoelectric converter through the broadband filter to be converted into an electric signal, the light source control panel carries out self-inspection on the light source, and the continuous light in the other path of the C wave band is transmitted to the first fiber bragg grating sensor, the second fiber bragg grating sensor and the third fiber bragg grating sensor respectively through the one-to-three coupler and the optical circulator;
step 2: the gratings in the first fiber grating sensor, the second fiber grating sensor and the third fiber grating sensor respectively modulate the light intensity corresponding to the gratings in the wavelength of the continuous light in the C waveband, when a train passes through and strain is transmitted to the fiber grating sensor group through a rail, the central wavelength of the reflected light of the gratings deviates, and the reflected light intensity of the continuous light in the C waveband regularly changes;
and step 3: three beams of reflected light output by the first fiber grating sensor, the second fiber grating sensor and the third fiber grating sensor respectively pass through the optical circulator, the one-to-two coupler B and the one-to-two coupler C in sequence and then are divided into two paths, one path of reflected light is subjected to edge filtering modulation by the first linear filter to obtain a reflected light modulation signal, the light intensity of the reflected light modulation signal is in direct proportion to the strain magnitude, the second photoelectric converter converts three reflected light modulation signals corresponding to the three fiber grating sensors into corresponding three reflected light modulation electrical signals, the other path of reflected light directly enters the second photoelectric converter, and the second photoelectric converter converts the reflected light emitted by the three fiber grating sensors into three reflected light reference electrical signals;
the main control board makes ratios of the three reflected light modulation electric signals and the corresponding three reflected light reference electric signals to obtain three ratio electric signals, analyzes the wavelength values corresponding to the three fiber grating sensors at the moment through the three ratio electric signals, further demodulates the strain values of the three fiber grating sensors at the moment, and carries out train axle counting according to the strain signals of the three fiber grating sensors and the sequence of the strain signals when a train comes;
three beams of reflected light output by the first fiber grating sensor, the second fiber grating sensor and the third fiber grating sensor respectively pass through the optical circulator, the one-to-two coupler B, the one-to-two coupler D and the second linear filter in sequence and then are divided into two paths, one path of reflected light is subjected to edge filtering modulation by the second linear filter to obtain a reflected light modulation signal, the light intensity of the reflected light modulation signal is in direct proportion to the strain magnitude, the third photoelectric converter converts three reflected light modulation signals corresponding to the three fiber grating sensors into three corresponding reflected light modulation electrical signals, the other path of reflected light directly enters the third photoelectric converter, and the third photoelectric converter converts the reflected light emitted by the three fiber grating sensors into three reflected light reference electrical signals;
the auxiliary control board makes ratios of the three reflected light modulation electric signals and the corresponding three reflected light reference electric signals to obtain three ratio electric signals, the wavelength values corresponding to the three fiber grating sensors at the moment are analyzed through the three ratio electric signals, strain values of the three fiber grating sensors at the moment are further demodulated, and the train axle counting is carried out according to the strain signals of the three fiber grating sensors and the sequence of the strain signals when the train comes;
and 4, step 4: and comparing the train axle counting result output by the main control board with the train axle counting result output by the auxiliary control board, if the results are the same, outputting the train axle counting result by the main control board, and if the results are different, giving an alarm by the main control board.
Due to the adoption of the technical scheme, the invention has the following advantages:
the system copies the strain change information carried on the optical signal into two parts through a one-to-two coupler, the two parts are respectively transmitted and processed through a set of independent data transmission and processing scheme of an optical path module and a circuit module, the number of axes is analyzed through comparison, and if the number of the axes counted by the two systems is consistent, the two systems are output; if the number of the counting shafts is different, warning information is output. The safety of the train axle counting product is effectively improved. Meanwhile, by combining a three-point grid arrangement axle counting scheme, the hidden danger of direction judgment errors existing in the traditional two-point grid arrangement scheme is effectively avoided, and the system safety is further improved.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic diagram of the structure of the demodulator of the present invention;
FIG. 3 is a schematic diagram of the edge filter modulation principle of the present invention;
in fig. 2, a light path portion is shown within a dashed box.
In fig. 3, str represents the strain direction, i.e., the train running direction;
the optical fiber grating sensor comprises a 1-first optical fiber grating sensor, a 1.1-second optical fiber grating sensor, a 1.2-third optical fiber grating sensor, a 2-optical fiber splice closure, a 3-demodulator, a 4-strain gauge, a 5-light source control board, a 6-ASE light source, a 7-one-to-two coupler A, an 8-broadband filter, a 9-first photoelectric converter, a 10-one-to-three coupler, an 11-optical circulator, a 12-auxiliary control board, a 13-one-to-two coupler B, a 14-first linear filter, a 15-second photoelectric converter, a 16-main control board, a 17-third photoelectric converter, a 18-one-to-two coupler C, a 19-one-to-two coupler D and a 20-second linear filter.
Detailed Description
The invention is described in further detail below with reference to the following figures and specific examples:
the safe rail transit axle counting system based on the edge filtering shown in the figures 1 and 2 is characterized in that: the fiber grating sensor group comprises a first fiber grating sensor 1, a second fiber grating sensor 1.1 and a third fiber grating sensor 1.2, wherein the first fiber grating sensor 1, the second fiber grating sensor 1.1 and the third fiber grating sensor 1.2 are respectively bonded with a corresponding strain gauge 4, the three strain gauges 4 are bonded on a rail waist, the first fiber grating sensor 1, the second fiber grating sensor 1.1 and the third fiber grating sensor 1.2 are positioned on the same straight line, and the second fiber grating sensor 1.1 is positioned between the first fiber grating sensor 1 and the third fiber grating sensor 1.2;
the demodulator 3 comprises a light source control board 5, an ASE light source 6, a one-to-two coupler A7, a broadband filter 8, a first photoelectric converter 9, a one-to-three coupler 10, an optical circulator 11, a one-to-two coupler B13, a first linear filter 14, a second photoelectric converter 15, a main control board 16 and a one-to-two coupler C18;
the light source control panel 5 is used for controlling the ASE light source 6 to output continuous light in a C wave band, the continuous light in the C wave band is divided into two paths by the one-division-two coupler A7, the continuous light in one path of the C wave band is transmitted to the first photoelectric converter 9 through the broadband filter 8 to be converted into an electric signal, the light source control panel 5 carries out light source self-detection, and the continuous light in the other path of the C wave band is transmitted to the first fiber grating sensor 1, the second fiber grating sensor 1.1 and the third fiber grating sensor 1.2 through the one-division-three coupler 10 and the optical circulator 11 in sequence;
the gratings in the first fiber grating sensor 1, the second fiber grating sensor 1.1 and the third fiber grating sensor 1.2 respectively modulate the light intensity corresponding to the grating in the wavelength of the continuous light in the C waveband, when a train passes through and strain is transmitted to a fiber grating sensor group (the coverage area of the sensor group is taken as a shaft counting point) through a rail, the central wavelength of the reflected light of the grating is shifted, the reflected light intensity of the continuous light in the C waveband is changed regularly, as shown in fig. 3, the larger the strain is, the larger the shift of the grating wavelength is, the larger the reflectivity of the corresponding filter is, and the stronger the light intensity after being filtered by the filter is;
three beams of reflected light output by the first fiber grating sensor 1, the second fiber grating sensor 1.1 and the third fiber grating sensor 1.2 respectively pass through the optical circulator (11), the one-to-two coupler B13 and the one-to-two coupler C18 in sequence and then are divided into two paths, one path of reflected light is subjected to edge filtering modulation by the first linear filter 14 (the larger the strain is, the larger the shift of the grating wavelength is, the larger the filter reflectivity corresponding to the center wavelength after the grating shifts is, and the stronger the light intensity after the grating filters is), so as to obtain a reflected light modulation signal, the light intensity of the reflected light modulation signal is in direct proportion to the strain magnitude (the larger the strain is, the stronger the modulation signal intensity is), the second photoelectric converter 15 converts the three reflected light modulation signals corresponding to the three fiber grating sensors into corresponding three reflected light modulation electrical signals, and the other path of reflected light directly enters the second photoelectric converter 15 (or the other path of reflected light is subjected to edge filtering modulation by the third linear filter) Then the reflected light enters a second photoelectric converter 15, the transmissivity of the first linear filter 14 monotonously increases in the selected waveband, the transmissivity of the third linear filter monotonously decreases in the selected waveband, and the system sensitivity can be enhanced), and the second photoelectric converter 15 converts the reflected light emitted by the three fiber bragg grating sensors into three reflected light reference electric signals;
the main control board 16 makes ratios of three reflective optical modulation electrical signals (each fiber grating sensor corresponds to one reflective optical modulation electrical signal and one reflective optical reference electrical signal) and three corresponding reflective optical reference electrical signals to obtain three ratio electrical signals (the ratio electrical signals can eliminate the influence of light source jitter and additional loss of other optical devices on the signals and improve the signal-to-noise ratio), analyzes the wavelength values corresponding to the three fiber grating sensors at the moment through the three ratio electrical signals, further demodulates the strain values of the three fiber grating sensors at the moment, and carries out train axle counting according to the strain signals of the three fiber grating sensors and the sequence of the strain signals when a train comes. Different from an electromagnetic sensor, the equipment related to the application scene in the invention is not sensitive to electromagnetism, is moisture-resistant and non-conductive, and effectively improves the safety.
In the above technical solution, the first fiber grating sensor 1, the second fiber grating sensor 1.1 and the third fiber grating sensor 1.2 are all common fiber Bragg gratings;
the center wavelengths of the first fiber grating sensor 1, the second fiber grating sensor 1.1 and the third fiber grating sensor 1.2 are within the monotone change range of the filter 14 (all 1550 nm).
In the above technical solution, it further includes an auxiliary control board 12, a third photoelectric converter 17, a one-to-two coupler D19 and a second linear filter 20, three beams of reflected light output by the first fiber grating sensor 1, the second fiber grating sensor 1.1 and the third fiber grating sensor 1.2 respectively pass through the optical circulator 11, the one-to-two coupler B13 and the one-to-two coupler D19 in sequence and then are divided into two paths, one path of reflected light is edge-filtered and modulated by the second linear filter 20 to obtain a reflected light modulation signal, the light intensity of the reflected light modulation signal is proportional to the strain magnitude, the third photoelectric converter 17 converts three reflected light modulation signals corresponding to the three fiber grating sensors into corresponding three reflected light modulation electrical signals, the other path of reflected light directly enters the third photoelectric converter 17 (or the other path of reflected light enters the third photoelectric converter 17 after edge-filtered and modulated by the fourth linear filter), the transmissivity of the second linear filter 20 monotonously increases in the selected waveband, the transmissivity of the fourth linear filter monotonously decreases in the selected waveband, and the system sensitivity can be enhanced), and the third photoelectric converter 17 converts the reflected light emitted by the three fiber bragg grating sensors into three reflected light reference electric signals;
the auxiliary control board 12 makes ratios of the three reflected light modulation electric signals and the corresponding three reflected light reference electric signals to obtain three ratio electric signals, analyzes the wavelength values corresponding to the three fiber grating sensors at the moment through the three ratio electric signals, further demodulates the strain values of the three fiber grating sensors at the moment, and carries out train axle counting according to the strain signals of the three fiber grating sensors and the sequence of the strain signals when a train comes.
In the above technical solution, the transmittances of the first linear filter 14 and the second linear filter 20 monotonically increase within a wavelength range of 1550-1556 nm; the broadband filter 8 only allows light in the wavelength range of 1550-1556 nm to pass through without filtering. The linear filter adopts a high-precision filter, and the linearity is not more than 0.0165%.
In the above technical solution, the first fiber grating sensor 1, the second fiber grating sensor 1.1 and the third fiber grating sensor 1.2 are located between two adjacent rail sleepers.
In the above technical solution, the first fiber grating sensor 1, the second fiber grating sensor 1.1 and the third fiber grating sensor 1.2 are all connected to the optical circulator 11 through the fiber splice closure 2.
In the technical scheme, when the light source control board 5 carries out light source self-checking, when the light intensity of the continuous light in the C wave band output by the broadband filter 8 within the wavelength of 1550-1556 nm is found not to be within the preset normal light intensity range, an alarm is given.
A rail transit axle counting method using the system comprises the following steps:
step 1: the light source control panel 5 controls the ASE light source 6 to output continuous light in a C wave band, the continuous light in the C wave band is divided into two paths by a one-to-two coupler A7, the continuous light in one path of the C wave band is transmitted to the first photoelectric converter 9 through the broadband filter 8 to be converted into an electric signal, the light source control panel 5 carries out light source self-detection, and the continuous light in the other path of the C wave band is transmitted to the first fiber grating sensor 1, the second fiber grating sensor 1.1 and the third fiber grating sensor 1.2 through the one-to-three coupler 10 and the optical circulator 11 in sequence;
step 2: the gratings in the first fiber grating sensor 1, the second fiber grating sensor 1.1 and the third fiber grating sensor 1.2 respectively modulate the light intensity corresponding to the grating in the wavelength of the continuous light in the C waveband, when a train passes through and strain is transmitted to the fiber grating sensor group through a rail, the central wavelength of the reflected light of the grating is shifted, and the reflected light intensity of the continuous light in the C waveband is changed regularly;
and step 3: three beams of reflected light output by the first fiber grating sensor 1, the second fiber grating sensor 1.1 and the third fiber grating sensor 1.2 respectively pass through the optical circulator 11, the one-to-two coupler B13 and the one-to-two coupler C18 in sequence and then are divided into two paths, one path of reflected light is subjected to edge filtering modulation by the first linear filter 14 to obtain a reflected light modulation signal, the light intensity of the reflected light modulation signal is in direct proportion to the strain magnitude, the second photoelectric converter 15 converts three reflected light modulation signals corresponding to the three fiber grating sensors into corresponding three reflected light modulation electrical signals, the other path of reflected light directly enters the second photoelectric converter 15, and the second photoelectric converter 15 converts the reflected light emitted by the three fiber grating sensors into three reflected light reference electrical signals;
the main control board 16 makes ratios of the three reflected light modulation electric signals and the corresponding three reflected light reference electric signals to obtain three ratio electric signals, analyzes the wavelength values corresponding to the three fiber grating sensors at the moment through the three ratio electric signals, further demodulates the strain values of the three fiber grating sensors at the moment, and carries out train axle counting according to the strain signals of the three fiber grating sensors and the sequence of the strain signals when a train comes;
three beams of reflected light output by the first fiber grating sensor 1, the second fiber grating sensor 1.1 and the third fiber grating sensor 1.2 respectively pass through the optical circulator 11, the one-to-two coupler B13, the one-to-two coupler D19 and the second linear filter 20 in sequence and then are divided into two paths, one path of reflected light is subjected to edge filtering modulation by the second linear filter 20 to obtain a reflected light modulation signal, the light intensity of the reflected light modulation signal is in direct proportion to the strain magnitude, the third photoelectric converter 17 converts three reflected light modulation signals corresponding to the three fiber grating sensors into corresponding three reflected light modulation electrical signals, the other path of reflected light directly enters the third photoelectric converter 17, and the third photoelectric converter 17 converts the reflected light emitted by the three fiber grating sensors into three reflected light reference electrical signals;
the auxiliary control board 12 makes ratios of the three reflected light modulation electric signals and the corresponding three reflected light reference electric signals to obtain three ratio electric signals, analyzes wavelength values corresponding to the three fiber grating sensors at the moment through the three ratio electric signals, further demodulates strain values of the three fiber grating sensors at the moment, and carries out train axle counting according to the strain signals of the three fiber grating sensors and the sequence of the strain signals when a train comes;
and 4, step 4: and comparing the train axle counting result output by the main control board 16 with the train axle counting result output by the auxiliary control board 12, if the results are the same, outputting the train axle counting result by the main control board 16, and if the results are different, giving an alarm by the main control board 16.
In step 3 of the above technical solution, the main control board 16 converts the strain value sensed by the first fiber grating sensor 1 into a grating center wavelength variation of the first fiber grating sensor 1;
the main control board 16 converts the strain value sensed by the second fiber grating sensor 1.1 into the grating center wavelength variation of the second fiber grating sensor 1.1;
the main control board 16 converts the strain value sensed by the third fiber grating sensor 1.2 into the grating center wavelength variation of the third fiber grating sensor 1.2;
the main control board 16 obtains a difference sequence of the variation of the grating center wavelength of the first fiber grating sensor 1 and the variation of the grating center wavelength of the second fiber grating sensor 1.1, so as to determine a peak point and a valley point of the difference sequence;
the main control board 16 obtains a difference sequence of the variation of the grating center wavelength of the second fiber grating sensor 1.1 and the variation of the grating center wavelength of the third fiber grating sensor 1.2, so as to determine a peak point and a valley point of the difference sequence;
for a difference sequence of the grating center wavelength variation of the first fiber grating sensor 1 and the grating center wavelength variation of the second fiber grating sensor 1.1, a peak point of the difference sequence is marked as A corresponding to a strain maximum point formed when the wheel runs to the first fiber grating sensor 1, and a valley point of the difference sequence is marked as B corresponding to a strain maximum point formed when the wheel runs to the second fiber grating sensor 1.1;
for the difference sequence of the grating center wavelength variation of the second fiber grating sensor 1.1 and the grating center wavelength variation of the third fiber grating sensor 1.2, the peak point of the difference sequence corresponds to the strain maximum point formed when the wheel runs to the second fiber grating sensor 1.1 and is marked as B1, and the valley point of the difference sequence corresponds to the strain maximum point formed when the wheel runs to the third fiber grating sensor 1.2 and is marked as C;
the main control board 16 sorts the strain maximum points of the broadband fiber gratings in time sequence, the strain maximum point sequence marked with A, B, B1 and C and the strain maximum point sequence marked with C, B1 and B, A in the sorting indicate that an axle passes through, the strain maximum point sequence marked with A, B, B1 and C and the strain maximum point sequence marked with C, B1 and B, A indicate the running direction of the train, the strain maximum point sequence marked with A, B, B1 and C and the strain maximum point sequence marked with C, B1 and B, A are counted, and the judgment of the train axle counting and the running direction of the train is realized.
When the invention is used, two sets of safe rail transit axle counting systems based on edge filtering are adopted to simultaneously judge the axle counting of the train and the running direction of the train, and form a 2x 2-2 redundant structure together with two sets of fiber bragg grating sensor groups and a demodulator 3, thereby isolating interference from the physical structure. Two sets of safe type rail transit axle counting systems based on edge filtering can adopt the double-machine hot standby or the combined use mode.
Hot standby of double machines: the two systems work simultaneously with one master and one slave. The main device outputs the axle counting and direction judging results outwards, and when the main device is abnormal, the auxiliary device takes over the work.
And the use mode is as follows: namely, the axle counting and direction judging results are output outwards at the same time. The comparison is consistent, and the output is carried out; and if the two are inconsistent, alarming. The system safety can be improved.
Details not described in this specification are within the skill of the art that are well known to those skilled in the art.
Claims (7)
1. The utility model provides a safe type rail transit axle counting system based on border filtering which characterized in that: the fiber grating sensor group comprises a first fiber grating sensor (1), a second fiber grating sensor (1.1) and a third fiber grating sensor (1.2), wherein the first fiber grating sensor (1), the second fiber grating sensor (1.1) and the third fiber grating sensor (1.2) are respectively bonded with a strain gauge (4) corresponding to each other, the three strain gauges (4) are bonded on a rail waist, and the first fiber grating sensor (1), the second fiber grating sensor (1.1) and the third fiber grating sensor (1.2) are positioned on the same straight line;
the demodulator (3) comprises a light source control board (5), an ASE light source (6), a one-to-two coupler A (7), a broadband filter (8), a first photoelectric converter (9), a one-to-three coupler (10), an optical circulator (11), a one-to-two coupler B (13), a first linear filter (14), a second photoelectric converter (15), a main control board (16) and a one-to-two coupler C (18);
the light source control board (5) is used for controlling an ASE light source (6) to output continuous light in a C wave band, the continuous light in the C wave band is divided into two paths through a one-to-two coupler A (7), the continuous light in one path of the C wave band is transmitted to a first photoelectric converter (9) through a broadband filter (8) to be converted into an electric signal, the light source control board (5) is used for carrying out light source self-detection, and the continuous light in the other path of the C wave band is sequentially transmitted to a first fiber grating sensor (1), a second fiber grating sensor (1.1) and a third fiber grating sensor (1.2) through a one-to-three coupler (10) and an optical circulator (11);
gratings in the first fiber grating sensor (1), the second fiber grating sensor (1.1) and the third fiber grating sensor (1.2) respectively modulate the light intensity corresponding to the grating in the wavelength of the continuous light in the C waveband, when a train passes through and strain is transmitted to a fiber grating sensor group through a rail, the central wavelength of the reflected light of the grating is shifted, and the reflected light intensity of the continuous light in the C waveband is changed regularly;
three beams of reflected light output by a first fiber grating sensor (1), a second fiber grating sensor (1.1) and a third fiber grating sensor (1.2) respectively pass through an optical circulator (11), a one-to-two coupler B (13) and a one-to-two coupler C (18) in sequence and then are divided into two paths, one path of reflected light is subjected to edge filtering modulation by a first linear filter (14) to obtain a reflected light modulation signal, the light intensity of the reflected light modulation signal is in direct proportion to the strain magnitude, a second photoelectric converter (15) converts three reflected light modulation signals corresponding to the three fiber grating sensors into corresponding three reflected light modulation electrical signals, the other path of reflected light directly enters the second photoelectric converter (15), and the second photoelectric converter (15) converts the reflected light emitted by the three fiber grating sensors into three reflected light reference electrical signals;
the main control board (16) makes ratios of the three reflected light modulation electric signals and the corresponding three reflected light reference electric signals to obtain three ratio electric signals, the wavelength values corresponding to the three fiber grating sensors at the moment are analyzed through the three ratio electric signals, strain values of the three fiber grating sensors at the moment are further demodulated, and the train axle counting is carried out according to the strain signals of the three fiber grating sensors at the moment when the train comes and the sequence of the strain signals;
the photoelectric conversion device also comprises an auxiliary control board (12), a third photoelectric converter (17), a one-to-two coupler D (19) and a second linear filter (20), three beams of reflected light output by the first fiber grating sensor (1), the second fiber grating sensor (1.1) and the third fiber grating sensor (1.2) respectively pass through the optical circulator (11), the one-to-two coupler B (13) and the one-to-two coupler D (19) and then are divided into two paths, one path of reflected light is subjected to edge filtering modulation by the second linear filter (20), the other path of reflected light is subjected to edge filtering modulation by the fourth linear filter and then enters the third photoelectric converter (17), the transmissivity of the second linear filter (20) monotonically rises in a selected waveband, the transmissivity of the fourth linear filter monotonically falls in the selected waveband, and the third photoelectric converter (17) converts three reflected light modulation signals corresponding to the three fiber grating sensors into corresponding reflected light modulation telecommunication signals The third photoelectric converter (17) converts the reflected light emitted by the three fiber bragg grating sensors into three reflected light reference electric signals;
the auxiliary control board (12) makes ratios of the three reflected light modulation electric signals and the corresponding three reflected light reference electric signals to obtain three ratio electric signals, the wavelength values corresponding to the three fiber grating sensors at the moment are analyzed through the three ratio electric signals, strain values of the three fiber grating sensors at the moment are further demodulated, and the train axle counting is carried out according to the strain signals of the three fiber grating sensors at the moment when the train comes and the sequence of the strain signals;
and comparing the train axle counting result output by the main control board (16) with the train axle counting result output by the auxiliary control board (12), if the results are the same, outputting the train axle counting result by the main control board (16), and if the results are different, giving an alarm by the main control board (16).
2. The safe rail transit axle counting system based on edge filtering of claim 1, wherein: the first fiber Bragg grating sensor (1), the second fiber Bragg grating sensor (1.1) and the third fiber Bragg grating sensor (1.2) are all common fiber Bragg gratings;
the central wavelength of the first fiber grating sensor (1), the second fiber grating sensor (1.1) and the third fiber grating sensor (1.2) is within the monotonous change range of the filter.
3. The safe rail transit axle counting system based on edge filtering of claim 1, wherein: the transmissivity of the first linear filter (14) and the second linear filter (20) is monotonously increased in a selected waveband; the broadband filter (8) allows only light in the selected band to pass unfiltered.
4. The safe rail transit axle counting system based on edge filtering of claim 1, wherein: the first fiber bragg grating sensor (1), the second fiber bragg grating sensor (1.1) and the third fiber bragg grating sensor (1.2) are positioned between two adjacent track sleepers; the first fiber grating sensor (1), the second fiber grating sensor (1.1) and the third fiber grating sensor (1.2) are connected into the optical circulator (11) through the optical fiber splice closure (2);
when the light source control board (5) carries out light source self-checking, when the light intensity of the continuous light in the C wave band output by the broadband filter (8) in the selected wave band is not in the preset normal light intensity range, an alarm is given.
5. A safe rail transit axle counting method based on edge filtering is characterized by comprising the following steps:
step 1: the light source control board (5) controls an ASE light source (6) to output continuous light in a C wave band, the continuous light in the C wave band is divided into two paths through a one-to-two coupler A (7), one path of the continuous light in the C wave band is transmitted to a first photoelectric converter (9) through a broadband filter (8) to be converted into an electric signal, the light source control board (5) carries out light source self-detection, and the other path of the continuous light in the C wave band is transmitted to a first fiber grating sensor (1), a second fiber grating sensor (1.1) and a third fiber grating sensor (1.2) through a one-to-three coupler (10) and an optical circulator (11) in sequence;
step 2: gratings in the first fiber grating sensor (1), the second fiber grating sensor (1.1) and the third fiber grating sensor (1.2) respectively modulate the light intensity corresponding to the grating in the wavelength of the continuous light in the C waveband, when a train passes through and strain is transmitted to a fiber grating sensor group through a rail, the central wavelength of the reflected light of the grating is shifted, and the reflected light intensity of the continuous light in the C waveband is changed regularly;
and step 3: three beams of reflected light output by a first fiber grating sensor (1), a second fiber grating sensor (1.1) and a third fiber grating sensor (1.2) respectively pass through an optical circulator (11), a one-to-two coupler B (13) and a one-to-two coupler C (18) in sequence and then are divided into two paths, one path of reflected light is subjected to edge filtering modulation by a first linear filter (14) to obtain a reflected light modulation signal, the light intensity of the reflected light modulation signal is in direct proportion to the strain magnitude, a second photoelectric converter (15) converts three reflected light modulation signals corresponding to the three fiber grating sensors into corresponding three reflected light modulation electrical signals, the other path of reflected light directly enters the second photoelectric converter (15), and the second photoelectric converter (15) converts the reflected light emitted by the three fiber grating sensors into three reflected light reference electrical signals;
the main control board (16) makes ratios of the three reflected light modulation electric signals and the corresponding three reflected light reference electric signals to obtain three ratio electric signals, the wavelength values corresponding to the three fiber grating sensors at the moment are analyzed through the three ratio electric signals, strain values of the three fiber grating sensors at the moment are further demodulated, and the train axle counting is carried out according to the strain signals of the three fiber grating sensors at the moment when the train comes and the sequence of the strain signals;
three beams of reflected light output by the first fiber grating sensor (1), the second fiber grating sensor (1.1) and the third fiber grating sensor (1.2) respectively pass through the optical circulator (11), the one-to-two coupler B (13), the one-to-two coupler D (19) and the second linear filter (20) in sequence and then are divided into two paths, one path of reflected light is subjected to edge filtering modulation by the second linear filter (20) to obtain a reflected light modulation signal, the light intensity of the reflected light modulation signal is in direct proportion to the strain magnitude, the third photoelectric converter (17) converts three reflected light modulation signals corresponding to the three fiber bragg grating sensors into corresponding three reflected light modulation electrical signals, the other path of reflected light directly enters the third photoelectric converter (17), and the third photoelectric converter (17) converts the reflected light emitted by the three fiber bragg grating sensors into three reflected light reference electrical signals;
the auxiliary control board (12) makes ratios of the three reflected light modulation electric signals and the corresponding three reflected light reference electric signals to obtain three ratio electric signals, the wavelength values corresponding to the three fiber grating sensors at the moment are analyzed through the three ratio electric signals, strain values of the three fiber grating sensors at the moment are further demodulated, and the train axle counting is carried out according to the strain signals of the three fiber grating sensors at the moment when the train comes and the sequence of the strain signals;
and 4, step 4: and comparing the train axle counting result output by the main control board (16) with the train axle counting result output by the auxiliary control board (12), if the results are the same, outputting the train axle counting result by the main control board (16), and if the results are different, giving an alarm by the main control board (16).
6. The rail transit axle counting method according to claim 5, wherein: in the step 3, the main control board (16) converts the strain value sensed by the first fiber grating sensor (1) into the grating center wavelength variation of the first fiber grating sensor (1);
the main control board (16) converts the strain value sensed by the second fiber grating sensor (1.1) into the grating center wavelength variation of the second fiber grating sensor (1.1);
the main control board (16) converts the strain value sensed by the third fiber grating sensor (1.2) into the grating center wavelength variation of the third fiber grating sensor (1.2);
the main control board (16) acquires a difference value sequence of the grating center wavelength variation of the first fiber grating sensor (1) and the grating center wavelength variation of the second fiber grating sensor (1.1), so that a peak point and a valley point of the difference value sequence are determined;
the main control board (16) acquires a difference sequence of the variation of the grating center wavelength of the second fiber grating sensor (1.1) and the variation of the grating center wavelength of the third fiber grating sensor (1.2), so as to determine a peak point and a valley point of the difference sequence;
for a difference sequence of the variation of the grating center wavelength of the first fiber grating sensor (1) and the variation of the grating center wavelength of the second fiber grating sensor (1.1), a peak point of the difference sequence corresponds to a strain maximum point formed when the wheel runs to the first fiber grating sensor (1) and is marked as A, and a valley point of the difference sequence corresponds to a strain maximum point formed when the wheel runs to the second fiber grating sensor (1.1) and is marked as B;
for a difference sequence of the variation of the grating center wavelength of the second fiber grating sensor (1.1) and the variation of the grating center wavelength of the third fiber grating sensor (1.2), the peak point of the difference sequence corresponds to the maximum strain point formed when the wheel runs to the second fiber grating sensor (1.1) and is marked as B1, and the valley point of the difference sequence corresponds to the maximum strain point formed when the wheel runs to the third fiber grating sensor (1.2) and is marked as C;
the main control board (16) sequences the strain maximum points of the broadband fiber gratings according to time sequence, the strain maximum point sequence marked with A, B, B1 and C and the strain maximum point sequence marked with C, B1 and B, A in the sequence indicate that an axle passes through, the strain maximum point sequence marked with A, B, B1 and C and the strain maximum point sequence marked with C, B1 and B, A indicate the running direction of the train, the strain maximum point sequence marked with A, B, B1 and C and the strain maximum point sequence marked with C, B1 and B, A are counted, and the train axle counting and the running direction judgment of the train are realized.
7. The rail transit axle counting method according to claim 5, wherein: two sets of safe rail transit axle counting systems based on edge filtering are adopted to simultaneously judge the axle counting of the train and the running direction of the train, and form a 2x 2-2 redundant structure together with two sets of fiber grating sensor groups and a demodulator (3).
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| CN113879358B (en) * | 2021-10-29 | 2023-06-09 | 国能朔黄铁路发展有限责任公司 | Track state monitoring device and method, control device and storage medium |
| CN115140118A (en) * | 2022-07-15 | 2022-10-04 | 北京全路通信信号研究设计院集团有限公司 | Axle counting method and system |
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