CN208296776U - A kind of fiber-optic grating sensor for railroad track meter shaft - Google Patents
A kind of fiber-optic grating sensor for railroad track meter shaft Download PDFInfo
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- CN208296776U CN208296776U CN201820409912.8U CN201820409912U CN208296776U CN 208296776 U CN208296776 U CN 208296776U CN 201820409912 U CN201820409912 U CN 201820409912U CN 208296776 U CN208296776 U CN 208296776U
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- lever
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- resistance arm
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Abstract
The utility model provides a kind of fiber-optic grating sensor for railroad track meter shaft, including strain sheet matrix and twin-stage lever amplification structure；A fiber grating is respectively set in the upper and lower surfaces of the strain sheet matrix；The twin-stage lever amplification structure includes the first lever and the second lever, the power arm end of first lever is supported set on the resistance arm end of second lever, the resistance arm end of first lever is contacted with rail, the power arm end of second lever and foil gauge substrate contact；The power arm lengths are greater than resistance arm lengths.The utility model can realize the amplification of the strain of rail foot, so that improving the accuracy and stability of measurement while exempting concatenation temperature sensor.
Description
Technical field
The utility model relates to rail traffic safety monitoring technology fields more particularly to a kind of for railroad track meter shaft
Fiber-optic grating sensor.
Background technique
Railway needs that train position in orbit and passage situation are monitored and are judged, and carries out vehicle tune accordingly
It spends the collision to avoid train and knocks into the back, therefore railway signal system is very important one of technical equipment, is railway traffic
Red, green light.The axle counting system that train passage situation is wherein monitored in signal system, is the core and key of system.Current
Axle counting system is mainly track circuit and two kinds of electromagnetic system.In recent years, with the development of fiber grating sensing technology, due to it
With passive, insulation, intrinsic safe explosion-proof, signal teletransmission, high reliability, increasingly paid close attention to.
Fiber grating sensing technology is to utilize the influences of the physical parameters to fiber grating reflection wavelength position such as temperature, strain
It is parsed and is calculated.Patent CN200710121157.X, CN200920088856.3, CN201019087029.7 patent and
CN201410539393.3 is all based on this thought of deformation that train axle applies rail to carry out meter shaft monitoring.To the mistake
In Cheng Jinhang force analysis, the contact length of wheel shaft and rail is set as 5mm, the weight shared on each wheel is 10 tons,
Rail is fixed in both ends sleeper position, and sleeper spacing is 54cm, and track steel select the rail of 60kg/m, and Young's modulus of elasticity is
215GPa, can be calculated the maximum strain in rail foot using ANSYS is only 130 μ ε.Since the strain of fiber grating is sensitive
Degree coefficient is 1pm/ μ ε, i.e., the maximum knots modification of wavelength is about 130pm at this time.Since the temperature sensitivity coefficient of fiber grating is
10pm/ DEG C, i.e., the variation of temperature can generate interference to strain measurement result, therefore be all made of one fiber grating temperature of concatenation at present
It spends sensor to measure for fiber grating meter shaft, carrys out influence of the compensation temperature to strain measurement, but corresponding using temperature sensor
The data for becoming sensor are corrected, the work that the scene of will lead to needs to increase the laying quantity of sensor and software calculates
Amount, causes the inconvenience in, even so, it is contemplated that fiber Bragg grating (FBG) demodulator table itself has measurement error, to the prison of meter shaft
Effect is surveyed still to seriously affect.
Summary of the invention
The technical problems to be solved in the utility model is to provide a kind of optical fiber grating sensing for railroad track meter shaft
Device realizes the amplification of the strain of rail foot, so that improving the accuracy of measurement while exempting concatenation temperature sensor
And stability.
The utility model is realized in this way: a kind of fiber-optic grating sensor for railroad track meter shaft, including strain
Sheet matrix and twin-stage lever amplification structure；
A fiber grating is respectively set in the upper and lower surfaces of the strain sheet matrix；
The twin-stage lever amplification structure includes the first lever and the second lever, and the power arm end of first lever is supported
Set on the resistance arm end of second lever, the resistance arm end of first lever is contacted with rail, second lever
Power arm end and foil gauge substrate contact；
The power arm lengths are greater than resistance arm lengths.
Further, the resistance arm end of first lever is supported by the first contact and is set to below rail, and described second
The power arm end of lever is supported by the second contact and is set to foil gauge body upper surface.
Further, the resistance arm end of first lever is additionally provided with first back-moving spring, first contact and
One reset spring is located at the resistance arm two sides of first lever, so that the first lever when being not affected by rail active force is protected
It holds in a fixed position, the setting of first back-moving spring is also to ensure that the first contact remains tight with the first lever during exercise
Closely connected conjunction.
Further, the contact jaw two sides of first lever and the second lever are separately installed with a limited block and one second
Reset spring is maintained at the first lever and the second lever when not by the power of rail on one fixed position.
Utility model has the advantages that larger times that realizes the strain to rail foot by designing bipolar lever construction
Several amplifications, making it is more than influence of the maximum environmental temperature to sensor locating for sensor, is exempting concatenation temperature sensor
Meanwhile structural instability problem caused by avoiding because of too long power arm, cause sensor height to increase.
Detailed description of the invention
The utility model is further described in conjunction with the embodiments with reference to the accompanying drawings.
Fig. 1 is a kind of schematic diagram of internal structure of the fiber-optic grating sensor for railroad track meter shaft of the utility model.
Fig. 2 is a kind of fiber-optic grating sensor for railroad track meter shaft of the utility model in one embodiment initial
Status diagram.
Fig. 3 is a kind of work in one embodiment of the fiber-optic grating sensor for railroad track meter shaft of the utility model
Make status diagram.
Drawing reference numeral explanation:
10- strains sheet matrix, 11- fiber grating, the first lever of 21-, the resistance arm of the first lever of 211-, the first thick stick of 212-
The power arm of bar, the second lever of 22-, the resistance arm of 221 second levers, the power arm of the second lever of 222-, the first contact of 23-,
The second contact of 24-, 25- first back-moving spring, 26- limited block, 27- second back-moving spring.
Specific embodiment
As shown in Figure 1 to Figure 3, a kind of fiber-optic grating sensor for railroad track meter shaft of the utility model, including answer
Become sheet matrix 10 and twin-stage lever amplification structure；
A fiber grating 11 is respectively set in the upper and lower surfaces of the strain sheet matrix 10, and it is solid that dispensing mode can be used
The fixed fiber grating 11, forms a complete fiber Bragg grating strain sensor；
The twin-stage lever amplification structure includes the first lever 21 and the second lever 22, the power of first lever 21
212 end of arm support set on second lever 22 221 end of resistance arm, 211 end of resistance arm of first lever 21 with
222 end of power arm of rail contact (not shown), second lever 22 is contacted with strain sheet matrix 10；
The power arm lengths are greater than resistance arm lengths, i.e., the 212 length m2 of power arm of described first lever 21 is greater than the
The 211 length m1 of resistance arm of one lever 21, the 222 length n2 of power arm of second lever 22 are greater than the resistance of the second lever 22
221 length n1 of the arm of force.
Preferably, 211 end of resistance arm of first lever 21 is supported by the first contact 23 is set to rail (not shown)
Lower section, 222 end of power arm of second lever 22 is supported by the second contact 24 is set to strain 10 upper surface of sheet matrix.
Preferably, 211 end of resistance arm of first lever 21 is additionally provided with first back-moving spring 25, first contact
23 and first back-moving spring 25 be located at 211 two sides of resistance arm of first lever 21 so that being not affected by rail active force
When the first lever 21 be maintained at a fixed position, i.e. original state position.
Preferably, the contact jaw two sides of first lever 21 and the second lever 22 are separately installed with a limited block 26 and one
Second back-moving spring 27 is maintained at the first lever 21 and the second lever 22 when not by the power of rail on one fixed position, i.e.,
Original state position.
The working principle of the utility model sensor is as follows:
Under the utility model sensor original state, that is, when being not affected by rail active force, as shown in Fig. 2, the first lever 21
It mutually contradicts with the second lever 22, and by the effect of first back-moving spring 25 and second back-moving spring 27, remains and first
Contact 23 and the second contact 24 are in close contact, and are located on a fixed position；In the effect that the first contact 23 is downward by rail
When power, the resistance arm 211 of the first lever 21 is by downward power, and the other side power arm 212 of 21 fulcrum O1 of the first lever is by negative side
To upward power, push the second lever 22 resistance arm 221 move upwards, corresponding second lever, 22 fulcrum O2's is another
It holds power arm 222 by downward power, the down force to strain sheet matrix 10 is realized by the second contact 24, so that foil gauge
The bending of matrix stress, i.e., when train passes through axle count sensor, making sensor, deformation occurs, the optical fiber light of sensor upper and lower surfaces
Grid are respectively at the tensile strain and compressive strain state of amplification, lead to wavelength change.
In one embodiment, if it is 12mm that size m2 and n2, which are 42mm, m1 and n1, according to lever principle: power ×
Power arm=resistance × resistance arm can obtain multiple formula: x=(m2 × n2)/(m1 × n1), and m2, n2, m1 and n1 are substituted into again
It is 12.25 times that number formula, which can obtain amplification factor x,.130 μ ε can be amplified to 1592.5 μ ε, correspond to optic fiber grating wavelength at this time
Change close to 1.6nm.Environment temperature locating for axle count sensor is calculated according to -40 DEG C~60 DEG C, fiber grating sensor wavelength
Variation is 1nm, still there is the measurement range of 0.6nm.
Above-mentioned m2, n2, m1 and n1 can be adjusted according to actual needs.
The utility model changes in the same direction, strains the principle of inverse change using optical fiber grating temperature, on strain sheet matrix,
A fiber grating is respectively pasted in lower surface, and sensor itself is made to realize temperature compensation function.The utility model has also been devised bipolar
The fiber-optic grating sensor for track axle count of lever amplification structure is, it can be achieved that 10 times or more strain measurement amplifications, keep it super
Cross influence of the maximum environmental temperature locating for sensor to sensor, exempt concatenate temperature sensor while, also avoid because
Structural instability problem, causes sensor height to increase caused by too long power arm, and the utility model sensor structure is simple,
It is easily achieved, (stability includes the stability of self structure and do not changed by external environment for detection accuracy and stability
Stability) obviously higher than existing same type sensor.
The utility model sensor application in railway track signaling system, it can be achieved that meter shaft scene it is " passive " monitoring,
Inherently eliminate the influence of electromagnetic interference.Simultaneously because sensor is without scene power supply, it is practical new using this convenient for laying
Type sensor is able to solve the problem of existing track geometry measuring device is influenced vulnerable to electromagnetic interference and adverse circumstances, is conducive to optical fiber biography
Feel the ability that signal teletransmission forms distributed monitoring, realizes that larger range of sensing covering and sensor are mutually examined, greatly improve
Railway track safety and railway operation efficiency.
Although those familiar with the art answers the foregoing describe specific embodiment of the present utility model
Working as understanding, we are merely exemplary described specific embodiment, rather than for the limit to the scope of the utility model
Fixed, those skilled in the art modification and variation equivalent made by the spirit according to the utility model all should
Cover in the scope of the claimed protection of the utility model.
Claims (4)
1. a kind of fiber-optic grating sensor for railroad track meter shaft, it is characterised in that: including strain sheet matrix and twin-stage thick stick
Bar enlarged structure；
A fiber grating is respectively set in the upper and lower surfaces of the strain sheet matrix；
The twin-stage lever amplification structure includes the first lever and the second lever, and the power arm end of first lever, which is supported, to be set to
The resistance arm end of the resistance arm end of second lever, first lever is contacted with rail, and second lever moves
Arm of force end and foil gauge substrate contact；
The power arm lengths are greater than resistance arm lengths.
2. a kind of fiber-optic grating sensor for railroad track meter shaft according to claim 1, it is characterised in that: described
The resistance arm end of first lever is supported by the first contact and is set to below rail, and the power arm end of second lever passes through the
Two contacts, which support, is set to foil gauge body upper surface.
3. a kind of fiber-optic grating sensor for railroad track meter shaft according to claim 2, it is characterised in that: described
The resistance arm end of first lever is additionally provided with first back-moving spring, and first contact and first back-moving spring are located at described
The resistance arm two sides of first lever, so that the first lever when being not affected by rail active force is maintained at a fixed position.
4. a kind of fiber-optic grating sensor for railroad track meter shaft according to claim 1, it is characterised in that: described
The contact jaw two sides of first lever and the second lever are separately installed with a limited block and a second back-moving spring, make the first lever and
Second lever is maintained on a fixed position when not by the power of rail.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820409912.8U CN208296776U (en) | 2018-03-26 | 2018-03-26 | A kind of fiber-optic grating sensor for railroad track meter shaft |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820409912.8U CN208296776U (en) | 2018-03-26 | 2018-03-26 | A kind of fiber-optic grating sensor for railroad track meter shaft |
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| Publication Number | Publication Date |
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| CN208296776U true CN208296776U (en) | 2018-12-28 |
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| CN201820409912.8U Active CN208296776U (en) | 2018-03-26 | 2018-03-26 | A kind of fiber-optic grating sensor for railroad track meter shaft |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108692669A (en) * | 2018-03-26 | 2018-10-23 | 林和光 | A kind of fiber-optic grating sensor for railroad track meter shaft |
-
2018
- 2018-03-26 CN CN201820409912.8U patent/CN208296776U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108692669A (en) * | 2018-03-26 | 2018-10-23 | 林和光 | A kind of fiber-optic grating sensor for railroad track meter shaft |
| CN108692669B (en) * | 2018-03-26 | 2024-03-26 | 林和光 | Fiber bragg grating sensor for railway track axle |
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