CN211107460U

CN211107460U - Axle counting system based on fiber bragg grating

Info

Publication number: CN211107460U
Application number: CN201921191684.2U
Authority: CN
Inventors: 郭丰明
Original assignee: Shenzhen Keanda Rail Transit Technology Co ltd
Current assignee: Shenzhen Keanda Rail Transit Technology Co ltd
Priority date: 2019-07-26
Filing date: 2019-07-26
Publication date: 2020-07-28
Anticipated expiration: 2029-07-26

Abstract

The utility model discloses a meter axle system based on fiber grating, including processing unit, modem unit and rail, processing unit's interface signal connection system terminal in proper order, detecting element and calibration unit, calibration unit's second interface and detecting element's interface signal connection and with the second interface signal connection of first coupler, the first interface signal connection of first coupler has the sweep frequency unit, the interface of sweep frequency unit and modem unit's interface signal connection, modem unit's interface signal connection has the optic fibre splice closure, optic fibre splice closure's interface signal connection has the meter axle device, the utility model relates to a meter axle technical field. This axle counting system based on fiber grating has reached accurate detection, the effect of elasticity protection, and it is accurate reliable to detect, has improved work efficiency, has the elasticity guard action to the sensor, avoids receiving external force to damage, has improved performance.

Description

Axle counting system based on fiber bragg grating

Technical Field

The utility model relates to a meter axle technical field specifically is a meter axle system based on fiber grating.

Background

The axle counting system is an important railway signal device, and train wheel information is detected by using a wheel sensor, and after calculation, conditions of section occupation or idle information are output to the interlocking system.

At present, a wheel sensor of an axle counting system is mainly applied to an electromagnetic sensor, and is often interfered by surrounding factors, such as lightning strike in rainy days, current induction and electromagnetic interference, so that the application of the electromagnetic sensor to electrification and high-speed trains is seriously influenced.

In order to solve the problem of the application of the traditional wheel sensing system based on the electromagnetic technology, the Fiber Bragg Grating (FBG) sensing technology is introduced into the wheel detection application of the high-speed railway. Because the rubber tire rolls when on the track, its tire itself also can take place deformation, and traditional axle counting device, the running condition of most unable accurate detection wheel for tram, the train of rubber wheel can produce the false detection even, and traditional axle counting device can not better protection fiber grating sensor moreover, and the external force damages easily, reduces work efficiency and performance.

SUMMERY OF THE UTILITY MODEL

Technical problem to be solved

The utility model provides a not enough to prior art, the utility model provides a meter axle system based on fiber grating has solved traditional meter axle device, and the most unable accurate detection wheel can produce the error detection even for the operational aspect of trolley-bus, the train of rubber wheel, and traditional meter axle device can not be better protection fiber grating sensor moreover, and easy exogenic damage reduces work efficiency and the problem of performance.

(II) technical scheme

In order to achieve the above purpose, the utility model discloses a following technical scheme realizes: the utility model provides a meter axle system based on fiber grating, includes processing unit, modem unit and rail, and processing unit is used for demodulating the processing data, and modem unit is used for demodulating sensing signal, processing unit's interface signal connection system terminal, detecting element and calibration unit in proper order, calibration unit's first interface signal connection has first coupler, calibration unit's second interface and detecting element's interface signal connection and with the second interface signal connection of first coupler, the first interface signal connection of first coupler has the sweep frequency unit, the interface of sweep frequency unit and modem unit's interface signal connection, modem unit's interface signal connection has the optical fiber splice closure, the interface signal connection of optical fiber splice closure has the meter axle device, the meter axle device buries underground on the rail.

Preferably, the grid axle counting system is characterized in that: the number of the detection units is a plurality of detection units which are uniformly distributed.

Preferably, the detection unit includes a first detector and a second coupler, and the first detector is in signal connection with the second coupler.

Preferably, the calibration unit includes a second detector, an interface signal of the second detector is connected to an etalon, and an interface signal of the etalon is connected to a fiber bragg grating.

Preferably, two fiber grating sensors form a shaft counting device, and the distance between the two fiber grating sensors in the shaft counting device is fixed and equal.

Preferably, the material of the conical elastic member is a rubber material.

Preferably, the axle counting device comprises a base, the base is embedded on a track, conical elastic pieces are fixedly connected to the corresponding positions of the top of the inside of the base, and a fiber grating sensor is arranged in the center of the inside of each conical elastic piece.

(III) advantageous effects

The utility model provides a meter axle system based on fiber grating. The method has the following beneficial effects:

(1) the axle counting system based on the fiber bragg grating comprises a system terminal, a detection unit and a calibration unit which are sequentially connected through an interface of a processing unit in a signal mode, a first interface signal of the calibration unit is connected with a first coupler, a second interface of the calibration unit is connected with an interface signal of the detection unit and is connected with a second interface signal of the first coupler in a signal mode, a first interface signal of the first coupler is connected with a frequency sweeping unit, an interface of the frequency sweeping unit is connected with an interface signal of a modulation and demodulation unit, and an interface signal of the modulation and demodulation unit is connected with an optical fiber splice closure.

(2) This axle counting system based on fiber grating buries underground on the rail through the basement, the equal fixedly connected with toper elastic component in the corresponding position in the inside top of basement, and the inside central point of toper elastic component puts and is provided with the fiber grating sensor, has reached the effect of elasticity protection, and rational in infrastructure is simple, and convenient to use has the elasticity guard action to the sensor, avoids receiving external force damage, has improved performance greatly.

Drawings

FIG. 1 is a block diagram of the present invention;

FIG. 2 is a block diagram of a probe unit;

FIG. 3 is a block diagram of a calibration unit;

fig. 4 is a schematic structural view of the axle counting device.

In the figure: the system comprises a processing unit 1, a modulation and demodulation unit 2, a track 3, a system terminal 4, a detection unit 5, a first detector 501, a second coupler 502, a calibration unit 6, a second detector 601, an etalon 602, a fiber Bragg grating 603, a first coupler 7, a frequency sweep unit 8, a fiber splice closure 9, an axis counting device 10, a substrate 101, a conical elastic member 102 and a fiber grating sensor 103.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

Referring to fig. 1-4, the present invention provides a technical solution: an axis counting system based on fiber bragg gratings comprises a processing unit 1, a modulation and demodulation unit 2 and a track 3, wherein the processing unit 1 is used for demodulating and processing data, the modulation and demodulation unit 2 is used for demodulating and processing sensing signals, an interface of the processing unit 1 is sequentially connected with a system terminal 4, a detection unit 5 and a calibration unit 6 in a signal mode, the number of the detection units 5 is a plurality and is uniformly distributed, the detection unit 5 comprises a first detector 501 and a second coupler 502, the first detector 501 is connected with the second coupler 502 in a signal mode, the calibration unit 6 comprises a second detector 601, an interface signal of the second detector 601 is connected with an etalon 602, an interface signal of the etalon 602 is connected with a fiber bragg grating 603, the fiber bragg grating 603 forms a narrow-band filter or reflector in a fiber core, a first interface signal of the calibration unit 6 is connected with a first coupler 7, the second interface of the calibration unit 6 is in signal connection with the interface of the detection unit 5 and is in signal connection with the second interface of the first coupler 7, the first interface of the first coupler 7 is in signal connection with the sweep frequency unit 8, the sweep frequency unit 8 can improve the sweep frequency rate and the output linearity of the light source, the interface of the sweep frequency unit 8 is in signal connection with the interface of the modem unit 2, the interface of the modem unit 2 is in signal connection with the optical fiber splice closure 9, the interface of the optical fiber splice closure 9 is in signal connection with the axle counting device 10, the axle counting device 10 comprises a base 101, the base 101 is embedded on the track 3, the conical elastic members 102 are fixedly connected at corresponding positions on the top inside of the base 101, the conical elastic members 102 are made of rubber, the material of the conical elastic members 102 has good elastic protection effect and low cost, and the optical fiber grating sensor 103 is arranged at the central position inside, the axle counting device 10 is embedded on the rail 3.

The two fiber grating sensors 103 form an axle counting device 10, and the distances between the two fiber grating sensors of the axle counting device 10 are fixed to be equal. As shown in FIG. 1, in use, the rail 3 is first divided into several sections by a shaft device 10 on the rail 3; when the wheel is rolled on the axle counting device 10, the fiber grating sensor 103 buried in the conical elastic piece 102 deforms, the center wavelength of the passing light wave changes, the change of the wavelength caused by the difference of the rolled weight is different, the changed sensing signal is output to the modulation and demodulation unit 2 through the fiber splicing box 9, the modulation and demodulation unit 2 and the frequency sweep unit 8 are matched for frequency sweep decoding, the decoded signal is output to the first coupler 7, and then the decoded signal is output to the calibration unit 6 and the detection unit 5 respectively. A plurality of fixed frequency code segments are arranged in the calibration unit 6, the number of the detection units 5 is correspondingly set according to the number of the fixed frequency code segments in the calibration unit 6, each detection unit corresponds to one frequency segment, and the calibration unit 6 compares and corrects the decoded signal and the set fixed frequency code segments and respectively outputs the decoded signal to the corresponding detection unit 5 and the corresponding processing unit 1; the detection unit 5 finally transmits the detected signals to the processing unit 1, the processing unit 1 calculates the number of wheel shafts of the vehicle passing through the axle counting device 10 according to the signals of the detection unit 5 and the calibration unit, judges the traveling direction, speed and weight of the vehicle, and outputs section occupation or idle information to the interlocking system. In addition, whether the train or the external interference exists is judged according to the detected weight, and alarm information is output, so that the judgment of maintenance personnel is facilitated.

The fiber grating sensor 103 is buried in the conical elastic member 102, the conical elastic member 102 can be obviously deformed under the external action, the deformation of the elastic conical elastic member 102 enables the fiber grating sensor 103 to sensitively detect the deformation stress, so that the running condition of an electric car and a train with wheels being rubber wheels can be accurately detected, and the conical elastic member 102 can also better protect the fiber grating sensor 103 and avoid damage due to external force.

When the device is used, firstly, the rail 3 is divided into sections by the fiber grating sensor 103 on the rail 3, when wheels are rolled to the axle counting device 10, the central wavelength of the fiber grating sensor 103 buried in the conical elastic part 102 changes, the changed sensing signal is output to the modulation and demodulation unit 2 through the fiber splice box 9, the modulation and demodulation unit 2 demodulates the signal and outputs the demodulated signal to the frequency sweeping unit 8, then the demodulated signal is output to the first coupler 7, then the demodulated signal is respectively output to the calibration unit 6 and the detection unit 5, and finally the demodulated signal is transmitted to the processing unit 1, the processing unit 1 calculates the number of axles, the number of wheels and the number of trucks of the vehicle passing through the axle counting device 10 according to the modulated pulse, and judges the traveling direction, the traveling speed, the health condition of the wheel pair and the weight of the vehicle, in the using process, the fiber grating sensor 103 is buried in the conical elastic part 102, and the conical elastic part 102 can be obviously deformed under the external action, the deformation that elastic toper elastic component 102 took place enables the sensitive deformation stress that detects of fiber grating sensor 103 to also can the accurate running condition that detects the tram that the wheel is the rubber wheel, train, moreover, toper elastic component 102 can also be better protects fiber grating sensor 103, avoids damaging because of external force.

It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation. The use of the phrase "comprising one of the elements does not exclude the presence of other like elements in the process, method, article, or apparatus that comprises the element.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims

1. An axle counting system based on fiber bragg grating comprises a processing unit (1), a modulation and demodulation unit (2) and a track (3), wherein the processing unit (1) is used for demodulating and processing data, and the modulation and demodulation unit (2) is used for demodulating a sensing signal, and is characterized in that: the interface of the processing unit (1) is sequentially in signal connection with a system terminal (4), a detection unit (5) and a calibration unit (6), a first interface signal of the calibration unit (6) is connected with a first coupler (7), a second interface of the calibration unit (6) is in signal connection with an interface of the detection unit (5) and is in signal connection with a second interface of the first coupler (7), a first interface signal of the first coupler (7) is connected with a sweep frequency unit (8), an interface of the sweep frequency unit (8) is in signal connection with an interface of a modulation and demodulation unit (2), an interface signal of the modulation and demodulation unit (2) is connected with an optical fiber splice closure (9), an interface signal of the optical fiber splice closure (9) is connected with a shaft counting device (10), the shaft counting device (10) comprises a substrate (101), and conical elastic pieces (102) are fixedly connected at corresponding positions on the top inside the substrate (101), the fiber bragg grating sensor (103) is arranged at the center of the inner part of the conical elastic piece (102), and the axle counting device (10) is embedded on the rail (3).

2. The fiber grating-based axis counting system of claim 1, wherein: the number of the detection units (5) is a plurality and the detection units are uniformly distributed.

3. The fiber grating-based axis counting system of claim 1, wherein: the detection unit (5) comprises a first detector (501) and a second coupler (502), and the first detector (501) is in signal connection with the second coupler (502).

4. The fiber grating-based axis counting system of claim 1, wherein: the calibration unit (6) comprises a second detector (601), an interface signal of the second detector (601) is connected with an etalon (602), and an interface signal of the etalon (602) is connected with a fiber Bragg grating (603).

5. The fiber grating-based axis counting system of claim 1, wherein: the two fiber bragg grating sensors (103) form an axis counting device (10), and the distances between the two fiber bragg grating sensors (103) in the axis counting device (10) are fixed to be equal.

6. The fiber grating-based axis counting system of claim 1, wherein: the material of the conical elastic piece (102) is made of rubber.

7. The fiber grating-based axis counting system of claim 5, wherein: the axle counting device (10) further comprises a base (101), the base (101) is embedded on the track (3), conical elastic pieces (102) are fixedly connected to positions corresponding to the top of the inside of the base (101), and a fiber bragg grating sensor (103) is arranged in the center of the inside of each conical elastic piece (102).