CN106382949A - Vehicle detection system and method for detecting vehicle - Google Patents
Vehicle detection system and method for detecting vehicle Download PDFInfo
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- CN106382949A CN106382949A CN201610739730.2A CN201610739730A CN106382949A CN 106382949 A CN106382949 A CN 106382949A CN 201610739730 A CN201610739730 A CN 201610739730A CN 106382949 A CN106382949 A CN 106382949A
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- 238000000034 method Methods 0.000 title claims abstract description 44
- 238000001514 detection method Methods 0.000 title claims abstract description 16
- 230000003287 optical effect Effects 0.000 claims abstract description 123
- 238000005259 measurement Methods 0.000 claims abstract description 52
- 239000013307 optical fiber Substances 0.000 claims abstract description 11
- 239000000835 fiber Substances 0.000 claims description 61
- 238000005286 illumination Methods 0.000 claims description 26
- 239000011159 matrix material Substances 0.000 claims description 11
- 230000008569 process Effects 0.000 claims description 11
- 230000001419 dependent effect Effects 0.000 claims description 10
- 230000010365 information processing Effects 0.000 claims description 10
- 230000005540 biological transmission Effects 0.000 claims description 4
- 230000000747 cardiac effect Effects 0.000 claims description 3
- 230000035945 sensitivity Effects 0.000 abstract description 8
- 238000005516 engineering process Methods 0.000 abstract description 4
- 238000012544 monitoring process Methods 0.000 description 11
- 238000001228 spectrum Methods 0.000 description 8
- 230000008859 change Effects 0.000 description 6
- 238000006073 displacement reaction Methods 0.000 description 6
- 238000006243 chemical reaction Methods 0.000 description 5
- 230000001133 acceleration Effects 0.000 description 4
- 230000000644 propagated effect Effects 0.000 description 4
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- 238000013461 design Methods 0.000 description 2
- 238000005538 encapsulation Methods 0.000 description 2
- 230000036541 health Effects 0.000 description 2
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
- G01D5/26—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light
- G01D5/32—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light
- G01D5/34—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells
- G01D5/353—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells influencing the transmission properties of an optical fibre
- G01D5/35338—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells influencing the transmission properties of an optical fibre using other arrangements than interferometer arrangements
- G01D5/35354—Sensor working in reflection
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
- G01D5/26—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light
- G01D5/32—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light
- G01D5/34—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells
- G01D5/36—Forming the light into pulses
- G01D5/38—Forming the light into pulses by diffraction gratings
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- Length Measuring Devices By Optical Means (AREA)
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Abstract
The invention discloses a vehicle detection system and a method for detecting a vehicle. The vehicle detection system comprises a wavelength demodulation module, a measurement module, a first optical cable and a second optical cable, and is characterized in that the wavelength demodulation module is used for emitting incident light and receiving reflected light at the same time; the first optical cable and the second optical cable are used for transmitting the incident light and the reflected light; the measurement module is used for converting strain of an optical fiber grating into offset of the central wavelength; and the wavelength demodulation module is further used for acquiring the offset of the central wavelength so as to detect corresponding vehicle information according to the offset. Relevant information of the vehicle is acquired according to the offset of the central wavelength, the positional distance generated by the offset and the offset time difference generated by the offset. Compared with an existing vehicle detection technology, the technical scheme provided by the invention has the advantages of high measurement precision, high response sensitivity, stable performance and the like.
Description
Technical field
The present invention relates to detection technique field, more particularly, to a kind of detecting system of the vehicles and its vehicles are entered
The method of row detection.
Background technology
In substantial amounts of infrastructure, the particularly industry such as highway, railway, subway, bridge tunnel is numerous, without one
Cover the health monitoring technique of complete science to help attendant to analyze, to judge potential safety hazard, then safety problem
It is very severe.Therefore in order to ensure structural safety, to bridge, tunnel, dam, steel building, mine, side slope with
And other large scale civil engineerings are also all necessary to implement health monitoring.However, existing vehicle testing techniques certainty of measurement is low, property
Can be poor.
Content of the invention
For solving the above problems, the present invention provides a kind of detecting system of the vehicles and its vehicles is detected
Method, at least partly solve the problems, such as in prior art that vehicle testing techniques certainty of measurement is low, poor performance.
For this reason, the present invention provide a kind of detecting system of the vehicles, including Wavelength demodulation module, measurement module, first
Optical cable and the second optical cable, described measurement module includes measured zone, and described measured zone is provided with fiber-optic grating sensor
Matrix, one end of described first optical cable is connected with described Wavelength demodulation module, and the other end of described first optical cable is in series with one
Light splitting fiber grating sensor, one end of described second optical cable is connected with described Wavelength demodulation module, described second optical cable another
End is in series with another part fiber-optic grating sensor；
Described Wavelength demodulation module is used for sending incident illumination, receives reflected light simultaneously；
Described first optical cable and described second optical cable are used for transmitting described incident illumination and described reflected light；
Described measurement module is used for the dependent variable of fiber grating is converted into the side-play amount of centre wavelength；
Described Wavelength demodulation module is additionally operable to obtain the side-play amount of described centre wavelength, to detect phase according to described side-play amount
The vehicle information answered.
Optionally, described Wavelength demodulation module includes interconnective light source submodule and information processing submodule, described
Information processing submodule is connected with described first optical cable and described second optical cable respectively；
Described light source submodule is used for sending incident illumination；
Described information process submodule be used for receiving reflected light, described reflected light is processed simultaneously with obtain described in
The side-play amount of cardiac wave length.
Optionally, described vehicle information is the speed of the vehicles；
Described Wavelength demodulation module is used for obtaining the poor and described optical fiber grating sensing of shift time of described centre wavelength
Predeterminable range between device；
Described Wavelength demodulation module is additionally operable to obtain described traffic work according to the poor and described predeterminable range of described shift time
The speed of tool.
Optionally, described vehicle information is the wheelbase of the vehicles；
Described Wavelength demodulation module is used for obtaining the positional distance of the fiber-optic grating sensor that centre wavelength shifts；
Described Wavelength demodulation module is additionally operable to obtain the wheelbase of the described vehicles according to described positional distance.
Optionally, described vehicle information is the speed of the vehicles；
Described Wavelength demodulation module is used for obtaining the wavelength shift of the fiber-optic grating sensor that centre wavelength shifts；
Described Wavelength demodulation module is additionally operable to obtain the speed of the described vehicles according to described wavelength shift.
The present invention also provides a kind of method vehicles being detected by detecting system, and described detecting system includes
Wavelength demodulation module, measurement module, the first optical cable and the second optical cable, described measurement module includes measured zone, described measurement
Fiber-optic grating sensor matrix is provided with region, one end of described first optical cable is connected with described Wavelength demodulation module, described
The other end of the first optical cable is connected some fiber-optic grating sensor, one end of described second optical cable and described Wavelength demodulation mould
Block connects, and the other end of described second optical cable is in series with another part fiber-optic grating sensor；
Methods described includes：
Described Wavelength demodulation module sends incident illumination, receives reflected light simultaneously；
Described first optical cable and incident illumination and described reflected light described in described second optical cable transmission；
The dependent variable of fiber grating is converted into the side-play amount of centre wavelength by described measurement module；
Described Wavelength demodulation module obtains the side-play amount of described centre wavelength, with according to the corresponding friendship of described side-play amount detection
Logical tool information.
Optionally, described Wavelength demodulation module includes interconnective light source submodule and information processing submodule, described
Information processing submodule is connected with described first optical cable and described second optical cable respectively；
Methods described also includes：
Described light source submodule sends incident illumination；
Described information processes submodule and receives reflected light, described reflected light is processed to obtain described middle cardiac wave simultaneously
Long side-play amount.
Optionally, described vehicle information is the speed of the vehicles；
Methods described also includes：
Described Wavelength demodulation module obtain described centre wavelength the poor and described fiber-optic grating sensor of shift time it
Between predeterminable range；
Described Wavelength demodulation module obtains the speed of the described vehicles according to the poor and described predeterminable range of described shift time
Degree.
Optionally, described vehicle information is the wheelbase of the vehicles；
Methods described also includes：
Described Wavelength demodulation module obtains the positional distance of the fiber-optic grating sensor that centre wavelength shifts；
Described Wavelength demodulation module obtains the wheelbase of the described vehicles according to described positional distance.
Optionally, described vehicle information is the speed of the vehicles；
Methods described also includes：
Described Wavelength demodulation module obtains the wavelength shift of the fiber-optic grating sensor that centre wavelength shifts；
Described Wavelength demodulation module obtains the speed of the described vehicles according to described wavelength shift.
The present invention has following beneficial effects：
The present invention provides a kind of detecting system of the vehicles and its method that the vehicles are detected, described traffic
The detecting system of instrument includes Wavelength demodulation module, measurement module, the first optical cable and the second optical cable, and described measurement module includes
Measured zone, described measured zone is provided with fiber-optic grating sensor matrix, one end of described first optical cable and described wavelength
Demodulation module connects, and the other end of described first optical cable is connected some fiber-optic grating sensor, and the one of described second optical cable
End is connected with described Wavelength demodulation module, and the other end of described second optical cable is in series with another part fiber-optic grating sensor；Institute
State Wavelength demodulation module and be used for sending incident illumination, receive reflected light simultaneously；Described first optical cable and described second optical cable are used for passing
Defeated described incident illumination and described reflected light；Described measurement module is used for for the dependent variable of fiber grating being converted into the inclined of centre wavelength
Shifting amount；Described Wavelength demodulation module is additionally operable to obtain the side-play amount of described centre wavelength, with corresponding according to the detection of described side-play amount
Vehicle information.The technical scheme that the present invention provides obtains the side-play amount of centre wavelength, inclined by fiber-optic grating sensor
Shifting amount produce positional distance and side-play amount produce shift time poor, further according to described side-play amount, described positional distance with
And the relevant information of the described shift time poor acquisition vehicles.Compared to existing vehicles detection technique, the present invention carries
For technical scheme have that certainty of measurement is high, reaction sensitivity is high and steady performance.
Brief description
A kind of structural representation of the detecting system of vehicles that Fig. 1 provides for the embodiment of the present invention one；
Fig. 2 is the structural representation of Wavelength demodulation module shown in Fig. 1；
A kind of stream of method vehicles being detected by detecting system that Fig. 3 provides for the embodiment of the present invention two
Cheng Tu.
Specific embodiment
For making those skilled in the art more fully understand technical scheme, below in conjunction with the accompanying drawings the present invention is carried
For the detecting system of the vehicles and its method that the vehicles are detected be described in detail.
Embodiment one
A kind of structural representation of the detecting system of vehicles that Fig. 1 provides for the embodiment of the present invention one.As Fig. 1 institute
Show, the detecting system of the described vehicles includes Wavelength demodulation module 1, measurement module 5, the first optical cable 2 and the second optical cable 3,
Described measurement module 5 includes measured zone 4, and described measured zone 4 is provided with fiber-optic grating sensor matrix 6.Described first
One end of optical cable 2 is connected with described Wavelength demodulation module 1, and the other end of described first optical cable 2 is connected some fiber grating
Sensor, the first character of the numbering of this part fiber grating sensor is A.One end of described second optical cable 3 and described ripple
Long demodulation module 1 connects, and the other end of described second optical cable 3 is in series with another part fiber-optic grating sensor, this part fiber
The first character of the numbering of grating sensor is B.Optionally, described first optical cable 2 and described second optical cable 3 are general single mode
Optical cable, described Wavelength demodulation module 1 is used for the centre wavelength reflecting is demodulated, and measures the side-play amount of wavelength.Even
The general single mode optical cable connecing different channel interfaces is used for transmitting measurement signal.The measured zone 4 being built-in with fiber grating is permissible
The strain value of measurement diverse location, measures Distribution value and time of measuring by fiber grating, may finally draw vehicle to be measured
Speed, the relevant information such as car weight and wheelbase.
The present embodiment utilizes the measuring principle of fiber grating as follows：In stretching or compression fiber grating, or change temperature
Deng other physical quantitys, the period L changing fiber grating and effective refractive index n can be reachedeff, thus reaching change fiber grating
Reflected wavelength lambdaBPurpose.The variable quantity of the variable quantity of the centre wavelength of fiber grating and strain, temperature is linear, root
According to above-mentioned characteristic, fiber grating can be fabricated to multiple sensing such as strain, temperature, pressure, acceleration, displacement by the present embodiment
Device.Fiber Bragg grating signal processor is used for the wavelength value of each fiber-optic grating sensor of Real-time Collection, by the ripple of grating sensor
The size of long variable quantity extrapolates the change size of respective physical amount (for example, temperature, stress etc.).By the way, this reality
Apply the purpose that example is achieved that physical quantity sensing detection.The technical scheme that the present embodiment provides utilizes fiber grating pair temperature, answers
Become sensitive characteristic, by the different design of sensor and encapsulation so that fiber grating produces the physical quantity of axial deformation,
To be measured by fiber-optic grating sensor, it can measure various physical parameters：Temperature, strain, pressure, displacement, acceleration
Degree etc..
In the present embodiment, described Wavelength demodulation module 1 is used for sending incident illumination, receives reflected light, described first light simultaneously
Cable 2 and described second optical cable 3 are used for transmitting described incident illumination and described reflected light, and described measurement module 5 is used for fiber grating
Dependent variable be converted into the side-play amount of centre wavelength, described Wavelength demodulation module 1 is additionally operable to obtain the skew of described centre wavelength
Amount, to detect corresponding vehicle information according to described side-play amount.The technical scheme that the present embodiment provides passes through fiber grating
The positional distance that sensor obtains the side-play amount of centre wavelength, side-play amount produces and the shift time of side-play amount generation are poor, then
Obtain the relevant information of the vehicles according to described side-play amount, described positional distance and described shift time difference.Compared to existing
Some vehicles detection techniques, the technical scheme that the present embodiment provides has certainty of measurement height, reaction sensitivity height and property
The advantages of can stablize.
Referring to Fig. 1, Wavelength demodulation module 1 is connected with two channel interfaces, and two different collections of channel interface correspondence are led to
Road, two acquisition interface are connected with two single mode fiber cables respectively, and on two general single mode optical cables, all string has fiber-optic grating sensor,
Constituted and be built-in with optical fiber light by the different cablings of two general single mode optical cables and its position of the fiber-optic grating sensor gone here and there
The measurement module 5 of grid.Compared to traditional vehicle testing techniques, the fiber grating sensing technology that the present embodiment provides is a kind of new
The optical sensing of type, it is linear within the specific limits with temperature, stress and so on physical quantities using the wavelength of fiber grating
To make various kinds of sensors.Fiber-optic grating sensor have electromagnetism interference, in high precision, high sensitivity, waterproof, anticorrosive, resistance to
The features such as long property is long, and fiber-optic grating sensor small volume, lightweight, it is easy to laying and installs, therefore the sensor is planted
Enter and in monitoring object, there is not coupling, the impact such as the performance on monitoring object and mechanics parameter is less.Fiber grating passes
Sensor is suitable for large area, distance, the comprehensive real time on-line monitoring of multiple types, is state-of-the-art structure monitoring skill at present
Art.
Fig. 2 is the structural representation of Wavelength demodulation module shown in Fig. 1.As shown in Fig. 2 described Wavelength demodulation module 1 includes
Interconnective light source submodule 11 and information processing submodule 12, described information process submodule 12 respectively with described first light
Cable 2 and described second optical cable 3 connect.Described light source submodule 11 is used for sending incident illumination, and described information processes submodule 12 and uses
In receiving reflected light, described reflected light is processed to obtain the side-play amount of described centre wavelength simultaneously.Optionally, described light
Source submodule 11 is wideband light source, and the wide spectrum optical that wideband light source sends can be propagated by two passages respectively, wide spectrum optical warp
Cross two different general single mode optical cables and reach the measured zone 4 being built-in with fiber grating, measurement module 5 monitoring fiber grating is anti-
It is emitted back towards the wavelength shift coming.
Referring to Fig. 1 and Fig. 2, described Wavelength demodulation module 1 is used for launching wideband light source, receives general single mode optical cable anti-simultaneously
It is emitted back towards the different skew wavelength coming, demodulate corresponding measurement physical quantity by the side-play amount of centre wavelength.Described Wavelength demodulation
Module 1 records the time that the positional information of different fiber-optic grating sensors, wavelength shift information and offset information occur, thus
Obtain corresponding information of vehicles.Described first optical cable 2 is the general single mode optical cable that string has fiber grating, for transmitting light energy,
The fiber grating skew long demodulation module of wavelength reflection echo 1 by reflection.Described second optical cable 3 is that string has the common of fiber grating
Single mode fiber cable, for transmitting light energy, by the fiber grating skew long demodulation module of wavelength reflection echo 1 of reflection.
The present embodiment records strain Distribution value and its temporal information using fiber grating matrix 6, thus obtaining driving vehicle
Relevant information.When not having vehicle through out-of-date, the centre wavelength value reflecting immobilizes, initial for initial fiber grating
Value.When having vehicle through out-of-date, the centre wavelength of the fiber-optic grating sensor of portion can enter line displacement, by fixed interval away from
From the shift time difference of centre wavelength of two fiber-optic grating sensors can draw the travel speed of vehicle, occurred by centre wavelength
The positional distance of the fiber-optic grating sensor of skew can draw the wheelbase of driving vehicle, the optical fiber light being shifted by centre wavelength
The wavelength shift of gate sensor can draw the speed of driving vehicle.
Referring to Fig. 2, the wide spectrum optical that light source submodule 11 sends is propagated by two passages respectively, and wide spectrum optical is through two
Different general single mode optical cables reaches the measured zone 4 being built-in with fiber grating.Information processing submodule 12 receives by common list
The different skew wavelength that mould optical cable reflects, demodulate corresponding measurement physical quantity by the side-play amount of centre wavelength.Information
Process that submodule 12 records the positional information of different fiber-optic grating sensors, when wavelength shift information and offset information occur
Between, thus obtaining corresponding information of vehicles.
The present embodiment provides a kind of detecting system of the vehicles, including Wavelength demodulation module, measurement module, the first optical cable
And second optical cable, described measurement module includes measured zone, described measured zone is provided with fiber-optic grating sensor matrix,
One end of described first optical cable is connected with described Wavelength demodulation module, and the other end of described first optical cable is connected some optical fiber
Grating sensor, one end of described second optical cable is connected with described Wavelength demodulation module, the other end series connection of described second optical cable
There is another part fiber-optic grating sensor；Described Wavelength demodulation module is used for sending incident illumination, receives reflected light simultaneously；Described
One optical cable and described second optical cable are used for transmitting described incident illumination and described reflected light；Described measurement module is used for fiber grating
Dependent variable be converted into the side-play amount of centre wavelength；Described Wavelength demodulation module is additionally operable to obtain the skew of described centre wavelength
Amount, to detect corresponding vehicle information according to described side-play amount.The technical scheme that the present embodiment provides passes through fiber grating
The positional distance that sensor obtains the side-play amount of centre wavelength, side-play amount produces and the shift time of side-play amount generation are poor, then
Obtain the relevant information of the vehicles according to described side-play amount, described positional distance and described shift time difference.Compared to existing
Some vehicles detection techniques, the technical scheme that the present embodiment provides has certainty of measurement height, reaction sensitivity height and property
The advantages of can stablize.
Embodiment two
A kind of stream of method vehicles being detected by detecting system that Fig. 3 provides for the embodiment of the present invention two
Cheng Tu.As shown in figure 3, described detecting system includes Wavelength demodulation module, measurement module, the first optical cable and the second optical cable, institute
State measurement module and include measured zone, described measured zone is provided with fiber-optic grating sensor matrix, described first optical cable
One end is connected with described Wavelength demodulation module, and the other end of described first optical cable is connected some fiber-optic grating sensor, institute
The one end stating the second optical cable is connected with described Wavelength demodulation module, and the other end of described second optical cable is in series with another part optical fiber
Grating sensor.
Methods described includes：
Step 1001, described Wavelength demodulation module send incident illumination, receive reflected light simultaneously.
Referring to Fig. 1, described Wavelength demodulation module 1 is used for the centre wavelength reflecting is demodulated, and measures wavelength
Side-play amount.The general single mode optical cable connecting different channel interfaces is used for transmitting measurement signal.It is built-in with the survey of fiber grating
Amount region 4 can measure the strain value of diverse location, measure Distribution value and time of measuring by fiber grating, may finally obtain
Go out the relevant informations such as speed, car weight and the wheelbase of vehicle to be measured.
Step 1002, described first optical cable and incident illumination and described reflected light described in described second optical cable transmission.
Optionally, described first optical cable 2 and described second optical cable 3 are general single mode optical cable.Described first optical cable 2 is that string has
The general single mode optical cable of fiber grating, for transmitting light energy, by the fiber grating skew wavelength reflection echo length demodulation of reflection
Module 1.Described second optical cable 3 is the general single mode optical cable that string has fiber grating, for transmitting light energy, by the optical fiber light of reflection
Grid offset the long demodulation module of wavelength reflection echo 1.
The dependent variable of fiber grating is converted into the side-play amount of centre wavelength by step 1003, described measurement module.
Step 1004, described Wavelength demodulation module obtain the side-play amount of described centre wavelength, to be examined according to described side-play amount
Survey corresponding vehicle information.
In the present embodiment, described Wavelength demodulation module 1 is used for sending incident illumination, receives reflected light, described first light simultaneously
Cable 2 and described second optical cable 3 are used for transmitting described incident illumination and described reflected light, and described measurement module 5 is used for fiber grating
Dependent variable be converted into the side-play amount of centre wavelength, described Wavelength demodulation module 1 is additionally operable to obtain the skew of described centre wavelength
Amount, to detect corresponding vehicle information according to described side-play amount.The technical scheme that the present embodiment provides passes through fiber grating
The positional distance that sensor obtains the side-play amount of centre wavelength, side-play amount produces and the shift time of side-play amount generation are poor, then
Obtain the relevant information of the vehicles according to described side-play amount, described positional distance and described shift time difference.Compared to existing
Some vehicles detection techniques, the technical scheme that the present embodiment provides has certainty of measurement height, reaction sensitivity height and property
The advantages of can stablize.
The present embodiment utilizes the measuring principle of fiber grating as follows：In stretching or compression fiber grating, or change temperature
Deng other physical quantitys, the period L changing fiber grating and effective refractive index n can be reachedeff, thus reaching change fiber grating
Reflected wavelength lambdaBPurpose.The variable quantity of the variable quantity of the centre wavelength of fiber grating and strain, temperature is linear, root
According to above-mentioned characteristic, fiber grating can be fabricated to multiple sensing such as strain, temperature, pressure, acceleration, displacement by the present embodiment
Device.Fiber Bragg grating signal processor is used for the wavelength value of each fiber-optic grating sensor of Real-time Collection, by the ripple of grating sensor
The size of long variable quantity extrapolates the change size of respective physical amount (for example, temperature, stress etc.).By the way, this reality
Apply the purpose that example is achieved that physical quantity sensing detection.The technical scheme that the present embodiment provides utilizes fiber grating pair temperature, answers
Become sensitive characteristic, by the different design of sensor and encapsulation so that fiber grating produces the physical quantity of axial deformation,
To be measured by fiber-optic grating sensor, it can measure various physical parameters：Temperature, strain, pressure, displacement, acceleration
Degree etc..
Referring to Fig. 1, Wavelength demodulation module 1 is connected with two channel interfaces, and two different collections of channel interface correspondence are led to
Road, two acquisition interface are connected with two single mode fiber cables respectively, and on two general single mode optical cables, all string has fiber-optic grating sensor,
Constituted and be built-in with optical fiber light by the different cablings of two general single mode optical cables and its position of the fiber-optic grating sensor gone here and there
The measurement module 5 of grid.Compared to traditional vehicle testing techniques, the fiber grating sensing technology that the present embodiment provides is a kind of new
The optical sensing of type, it is linear within the specific limits with temperature, stress and so on physical quantities using the wavelength of fiber grating
To make various kinds of sensors.Fiber-optic grating sensor have electromagnetism interference, in high precision, high sensitivity, waterproof, anticorrosive, resistance to
The features such as long property is long, and fiber-optic grating sensor small volume, lightweight, it is easy to laying and installs, therefore the sensor is planted
Enter and in monitoring object, there is not coupling, the impact such as the performance on monitoring object and mechanics parameter is less.Fiber grating passes
Sensor is suitable for large area, distance, the comprehensive real time on-line monitoring of multiple types, is state-of-the-art structure monitoring skill at present
Art.
Referring to Fig. 2, described Wavelength demodulation module 1 includes interconnective light source submodule 11 and information processing submodule
12, described information is processed submodule 12 and is connected with described first optical cable 2 and described second optical cable 3 respectively.Described light source submodule
11 are used for sending incident illumination, and described information processes submodule 12 and is used for receiving reflected light, described reflected light is processed simultaneously
To obtain the side-play amount of described centre wavelength.Optionally, described light source submodule 11 is wideband light source, the width that wideband light source sends
Spectrum light can be propagated by two passages respectively, and wide spectrum optical reaches through two different general single mode optical cables and is built-in with optical fiber
The measured zone 4 of grating, measurement module 5 monitors the wavelength shift that fiber grating reflects.
In the present embodiment, described Wavelength demodulation module 1 is used for launching wideband light source, receives the reflection of general single mode optical cable simultaneously
The different skew wavelength returned, demodulate corresponding measurement physical quantity by the side-play amount of centre wavelength.Described Wavelength demodulation mould
Block 1 records the time that the positional information of different fiber-optic grating sensors, wavelength shift information and offset information occur, thus obtaining
Obtain corresponding information of vehicles.The present embodiment records strain Distribution value and its temporal information using fiber grating matrix 6, thus obtaining
The relevant information of driving vehicle.When not having vehicle through out-of-date, the centre wavelength value reflecting immobilizes, for initial optical fiber
Grating initial value.When having vehicle through out-of-date, the centre wavelength of the fiber-optic grating sensor of portion can enter line displacement, by solid
The shift time difference determining the centre wavelength of two fiber-optic grating sensors of spacing distance can draw the travel speed of vehicle, by center
The positional distance of the fiber-optic grating sensor that wavelength shifts can draw the wheelbase of driving vehicle, is shifted by centre wavelength
The wavelength shift of fiber-optic grating sensor can draw the speed of driving vehicle.
Referring to Fig. 2, the wide spectrum optical that light source submodule 11 sends is propagated by two passages respectively, and wide spectrum optical is through two
Different general single mode optical cables reaches the measured zone 4 being built-in with fiber grating.Information processing submodule 12 receives by common list
The different skew wavelength that mould optical cable reflects, demodulate corresponding measurement physical quantity by the side-play amount of centre wavelength.Information
Process that submodule 12 records the positional information of different fiber-optic grating sensors, when wavelength shift information and offset information occur
Between, thus obtaining corresponding information of vehicles.
The present embodiment provides a kind of method vehicles being detected by detecting system, and described detecting system includes
Wavelength demodulation module, measurement module, the first optical cable and the second optical cable, described measurement module includes measured zone, described measurement
Fiber-optic grating sensor matrix is provided with region, one end of described first optical cable is connected with described Wavelength demodulation module, described
The other end of the first optical cable is connected some fiber-optic grating sensor, one end of described second optical cable and described Wavelength demodulation mould
Block connects, and the other end of described second optical cable is in series with another part fiber-optic grating sensor.Methods described includes：Described wavelength
Demodulation module sends incident illumination, receives reflected light simultaneously；Described first optical cable and incident illumination described in described second optical cable transmission and
Described reflected light；The dependent variable of fiber grating is converted into the side-play amount of centre wavelength by described measurement module；Described Wavelength demodulation
Module obtains the side-play amount of described centre wavelength, to detect corresponding vehicle information according to described side-play amount.The present embodiment
There is provided technical scheme by fiber-optic grating sensor obtain centre wavelength side-play amount, side-play amount generation positional distance and
The shift time that side-play amount produces is poor, obtains and hands over further according to described side-play amount, described positional distance and described shift time difference
The relevant information of logical instrument.Compared to existing vehicles detection technique, the technical scheme that the present embodiment provides has measurement
High precision, reaction sensitivity height and steady performance.
It is understood that the embodiment of above principle being intended to be merely illustrative of the present and the exemplary enforcement adopting
Mode, but the invention is not limited in this.For those skilled in the art, in the essence without departing from the present invention
In the case of god and essence, various modifications and improvement can be made, these modifications and improvement are also considered as protection scope of the present invention.
Claims (10)
1. a kind of detecting system of the vehicles it is characterised in that include Wavelength demodulation module, measurement module, the first optical cable with
And second optical cable, described measurement module includes measured zone, described measured zone is provided with fiber-optic grating sensor matrix, institute
The one end stating the first optical cable is connected with described Wavelength demodulation module, and the other end of described first optical cable is connected some optical fiber light
Gate sensor, one end of described second optical cable is connected with described Wavelength demodulation module, and the other end of described second optical cable is in series with
Another part fiber-optic grating sensor；
Described Wavelength demodulation module is used for sending incident illumination, receives reflected light simultaneously；
Described first optical cable and described second optical cable are used for transmitting described incident illumination and described reflected light；
Described measurement module is used for the dependent variable of fiber grating is converted into the side-play amount of centre wavelength；
Described Wavelength demodulation module is additionally operable to obtain the side-play amount of described centre wavelength, with corresponding according to the detection of described side-play amount
Vehicle information.
2. the detecting system of the vehicles according to claim 1 is it is characterised in that described Wavelength demodulation module includes phase
The light source submodule connecting and information processing submodule, described information process submodule respectively with described first optical cable and described
Second optical cable connects；
Described light source submodule is used for sending incident illumination；
Described information processes submodule and is used for receiving reflected light, described reflected light is processed to obtain described middle cardiac wave simultaneously
Long side-play amount.
3. the detecting system of the vehicles according to claim 1 is it is characterised in that described vehicle information is traffic
The speed of instrument；
Described Wavelength demodulation module be used for obtain described centre wavelength the poor and described fiber-optic grating sensor of shift time it
Between predeterminable range；
Described Wavelength demodulation module is additionally operable to obtain the described vehicles according to the poor and described predeterminable range of described shift time
Speed.
4. the detecting system of the vehicles according to claim 1 is it is characterised in that described vehicle information is traffic
The wheelbase of instrument；
Described Wavelength demodulation module is used for obtaining the positional distance of the fiber-optic grating sensor that centre wavelength shifts；
Described Wavelength demodulation module is additionally operable to obtain the wheelbase of the described vehicles according to described positional distance.
5. the detecting system of the vehicles according to claim 1 is it is characterised in that described vehicle information is traffic
The speed of instrument；
Described Wavelength demodulation module is used for obtaining the wavelength shift of the fiber-optic grating sensor that centre wavelength shifts；
Described Wavelength demodulation module is additionally operable to obtain the speed of the described vehicles according to described wavelength shift.
6. a kind of method vehicles being detected by detecting system is it is characterised in that described detecting system includes ripple
Long demodulation module, measurement module, the first optical cable and the second optical cable, described measurement module includes measured zone, described measurement zone
Fiber-optic grating sensor matrix is provided with domain, one end of described first optical cable is connected with described Wavelength demodulation module, described
The other end of one optical cable is connected some fiber-optic grating sensor, one end of described second optical cable and described Wavelength demodulation module
Connect, the other end of described second optical cable is in series with another part fiber-optic grating sensor；
Methods described includes：
Described Wavelength demodulation module sends incident illumination, receives reflected light simultaneously；
Described first optical cable and incident illumination and described reflected light described in described second optical cable transmission；
The dependent variable of fiber grating is converted into the side-play amount of centre wavelength by described measurement module；
Described Wavelength demodulation module obtains the side-play amount of described centre wavelength, to detect corresponding traffic work according to described side-play amount
Tool information.
7. the method vehicles being detected by detecting system according to claim 6 is it is characterised in that described
Wavelength demodulation module includes interconnective light source submodule and information processing submodule, described information process submodule respectively with
Described first optical cable and described second optical cable connect；
Methods described also includes：
Described light source submodule sends incident illumination；
Described information processes submodule and receives reflected light, described reflected light is processed to obtain described centre wavelength simultaneously
Side-play amount.
8. the method vehicles being detected by detecting system according to claim 6 is it is characterised in that described
Vehicle information is the speed of the vehicles；
Methods described also includes：
Described Wavelength demodulation module obtains between the poor and described fiber-optic grating sensor of shift time of described centre wavelength
Predeterminable range；
Described Wavelength demodulation module obtains the speed of the described vehicles according to the poor and described predeterminable range of described shift time.
9. the method vehicles being detected by detecting system according to claim 6 is it is characterised in that described
Vehicle information is the wheelbase of the vehicles；
Methods described also includes：
Described Wavelength demodulation module obtains the positional distance of the fiber-optic grating sensor that centre wavelength shifts；
Described Wavelength demodulation module obtains the wheelbase of the described vehicles according to described positional distance.
10. the method vehicles being detected by detecting system according to claim 6 is it is characterised in that institute
State the speed that vehicle information is the vehicles；
Methods described also includes：
Described Wavelength demodulation module obtains the wavelength shift of the fiber-optic grating sensor that centre wavelength shifts；
Described Wavelength demodulation module obtains the speed of the described vehicles according to described wavelength shift.
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| CN201610739730.2A CN106382949A (en) | 2016-08-26 | 2016-08-26 | Vehicle detection system and method for detecting vehicle |
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| CN106885551A (en) * | 2017-02-20 | 2017-06-23 | 广西交通科学研究院有限公司 | Based on bridge dynamic strain identification one bicycle axle away from method |
| CN106918716A (en) * | 2017-03-13 | 2017-07-04 | 无锡亚天光电科技有限公司 | A kind of optical fiber structure and its determination methods for judging landing object movement trend |
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| CN104390685A (en) * | 2014-11-18 | 2015-03-04 | 苏州佳因特光电科技有限公司 | Portable optical fiber dynamic weighing system |
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