CN220018700U - Optical fiber sensor for detecting weight of vehicle - Google Patents
Optical fiber sensor for detecting weight of vehicle Download PDFInfo
- Publication number
- CN220018700U CN220018700U CN202320938755.0U CN202320938755U CN220018700U CN 220018700 U CN220018700 U CN 220018700U CN 202320938755 U CN202320938755 U CN 202320938755U CN 220018700 U CN220018700 U CN 220018700U
- Authority
- CN
- China
- Prior art keywords
- optical fiber
- vehicle
- weight
- bragg grating
- detection plate
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 239000013307 optical fiber Substances 0.000 title claims abstract description 144
- 238000001514 detection method Methods 0.000 claims abstract description 112
- 238000005452 bending Methods 0.000 claims abstract description 9
- 239000000835 fiber Substances 0.000 claims description 89
- 238000000034 method Methods 0.000 claims 1
- 238000009434 installation Methods 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 17
- 239000000463 material Substances 0.000 description 8
- 230000006835 compression Effects 0.000 description 5
- 238000007906 compression Methods 0.000 description 5
- 230000003287 optical effect Effects 0.000 description 4
- 230000000694 effects Effects 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 229910001374 Invar Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 230000000994 depressogenic effect Effects 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 231100000989 no adverse effect Toxicity 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- 238000007665 sagging Methods 0.000 description 1
- 238000005303 weighing Methods 0.000 description 1
Landscapes
- Length Measuring Devices By Optical Means (AREA)
Abstract
The utility model discloses an optical fiber sensor for detecting the weight of a vehicle, and belongs to the field of sensors. The vehicle-mounted optical fiber bending detection device comprises a detection plate, an optical fiber and an optical fiber Bragg grating, wherein the detection plate is arranged on a road to bear vehicle load and bend, the optical fiber is used for transmitting light, the optical fiber Bragg grating is arranged in the optical fiber and is fixed on the detection plate, and the bending of the detection plate due to the vehicle load is detected through the optical fiber Bragg grating. The optical fiber sensor for measuring the weight of the running vehicle has the advantages of simple structure, no problem of complex fixation of the reference optical fiber and simple and convenient installation.
Description
Technical Field
The utility model relates to the technical field of sensors, in particular to an optical fiber sensor for detecting the weight of a vehicle.
Background
Conventionally, there is a vehicle weighing apparatus that detects the weight of a vehicle using an optical fiber sensor, wherein an optical fiber is provided in a pressure receiving portion for detecting the weight of the vehicle by the optical fiber sensor, and the weight of the vehicle is measured from a phase difference between transmitted light from a reference optical fiber provided separately. The optical fiber sensor for measuring the weight of the vehicle can measure the weight of the vehicle within a prescribed measurement accuracy even if the tire contact area of the vehicle on the optical fiber sensor is different.
However, in the prior art, the reference fiber length of the optical fiber as the phase reference and the sensing fiber length for detecting the pressure need to be the same length, and the fixation of the optical fiber is complicated.
Disclosure of Invention
In view of the above, it is an object of the present utility model to solve the above-mentioned drawbacks and problems of the prior art, and to provide an optical fiber sensor for detecting the weight of a vehicle, which can measure the weight of a traveling vehicle using a vehicle weight sensor having a simple structure and connect a plurality of sensors to a single measuring instrument.
An embodiment of the present utility model provides an optical fiber sensor for detecting a weight of a vehicle, including a detection plate for being disposed on a road to bear a load of the vehicle and being bent, an optical fiber transmitting light, and an optical fiber bragg grating disposed in the optical fiber, the optical fiber bragg grating being fixed to the detection plate, and bending of the detection plate due to the load of the vehicle being detected by the optical fiber bragg grating.
Further, the fiber Bragg grating is arranged between a detection plate bent under the action of the weight of the vehicle and a fixed plate, the fiber Bragg grating is vertically arranged on the lower surface of the detection plate, the fixed plate supports the lower end of the fiber Bragg grating, and compressive strain is applied to the fiber Bragg grating when the detection plate is bent under the load of the vehicle.
Further, the fiber bragg grating is vertically installed at the center of the lower surface of the sensing plate.
Further, the fixing plate is a rigid piece and is buried below the detection plate arranged on the road surface.
Further, the fiber bragg grating is arranged between a detection plate bent under the weight of the vehicle and a fixed plate, a traction part is arranged on the lower surface of the detection plate, a holding part is arranged on the fixed plate, the holding part is connected with the upper end of the fiber bragg grating, the traction part is connected with the lower end of the fiber bragg grating, and tensile strain is applied to the fiber bragg grating when the detection plate is bent under the load of the vehicle.
Further, one end of the traction part is arranged in the center of the lower surface of the detection plate, and the other end of the traction part is connected with the lower end of the fiber Bragg grating.
Further, the fixing plate is a rigid piece and is buried below the detection plate arranged on the road surface.
Further, the traction portion and the holding portion are rigid members.
Further, the traction part is L-shaped, one end of the traction part is arranged on the lower surface of the detection plate, and the other end of the traction part is arranged on the lower end of the fiber Bragg grating; the holding part is L-shaped, one end of the holding part is connected to the upper surface of the fixing plate, and the other end of the holding part suspends the fiber Bragg grating.
The technical scheme provided by the embodiment of the utility model has the following beneficial effects: the optical fiber sensor for measuring the weight of the running vehicle is simple in structure, free of the problem of complex fixation of the reference optical fiber and convenient to install.
Drawings
Fig. 1 is a schematic structure view of an optical fiber sensor for detecting a weight of a vehicle according to the present utility model.
Fig. 2 is a configuration diagram showing a state in which a vehicle weight is applied to an optical fiber sensor for detecting a vehicle weight.
Fig. 3 is a characteristic diagram of the relationship between vehicle weight and fiber bragg grating wavelength variation.
Fig. 4 is a block diagram of a fiber optic sensor for detecting a vehicle weight according to an embodiment.
Fig. 5 is a configuration diagram showing a state in which a vehicle weight is applied to the optical fiber sensor for vehicle weight detection according to one embodiment.
Fig. 6 is a structural diagram of an optical fiber sensor for detecting the weight of a vehicle according to another embodiment.
Fig. 7 is a configuration diagram of a state in which a vehicle weight is applied to a fiber sensor for detecting a vehicle weight according to another embodiment.
Fig. 8 is a block diagram of a vehicle weight detection system using an optical fiber sensor for vehicle weight detection according to an embodiment.
Fig. 9 is a block diagram of a vehicle weight detecting system using an optical fiber sensor for vehicle weight detection according to another embodiment.
Wherein, 1-fiber Bragg grating; 2-detecting plate; 3-fixing plates; 4-a traction part; 5-a holding part; 6-optical fiber; 10-an optical fiber sensor for detecting the weight of the vehicle; 11-an optical coupler; 12-wavelength measuring instrument; 15-an optical fiber sensor for detecting the vehicle weight; 16-an optical fiber sensor for detecting the weight of the vehicle; 20-a vehicle weight detection system; 21-vehicle weight detection system.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the present utility model more apparent, embodiments of the present utility model will be further described with reference to the accompanying drawings. The following presents a preferred one of a number of possible embodiments of the utility model in order to provide a basic understanding of the utility model, but is not intended to identify key or critical elements of the utility model or to delineate the scope of the utility model.
Fig. 1 is a schematic diagram showing the structure of an optical fiber sensor 10 for detecting the weight of a vehicle. Fig. 2 is a configuration diagram showing a state in which the vehicle weight is applied to the optical fiber sensor 10 for detecting the vehicle weight.
As shown in fig. 1, the optical fiber sensor 10 for detecting the weight of the vehicle includes an optical fiber 6 that transmits light, an optical fiber bragg grating 1 provided in the optical fiber 6, and a detection plate 2 made of an elastic plate for fixing the optical fiber bragg grating 1.
The optical fiber bragg grating 1 is a diffraction grating formed by providing a periodic refractive index change (grating) in the longitudinal direction of the core of the optical fiber 6, and has a property of reflecting only light of a specific wavelength transmitted in the optical fiber 6 and transmitting light of other wavelength bands. The fiber bragg grating 1 is a sensor unit including a grating, and the refractive index of the grating reflects light of different wavelengths for each of the fiber sensors 10 that detect the weight of the vehicle.
As shown, the fiber bragg grating 1 is fixed to the lower surface of the detection plate 2, and is disposed such that the gratings are arrayed along the surface of the detection plate 2. According to the deformation of the detection plate 2, the fiber bragg grating 1 also has a structure in which deformation occurs due to the deformation at the portion where the fiber bragg grating 1 is attached in close contact with the detection plate 2.
The detection plate 2 is made of a metal plate or the like, and is deformed by an external force. The detection plate 2 is fixed at both ends, and the middle part of the detection plate is bent by load when the vehicle passes. The detection plate 2 is made of a material having a small coefficient of thermal expansion and contraction (for example, invar alloy), and is not easily affected by changes in ambient temperature.
The illustrated optical fiber sensor 10 for detecting the weight of a vehicle is laid directly under a road where the vehicle passes or buried directly under a road where the vehicle passes, and the gratings of the optical fiber bragg gratings 1 are arranged along the road surface. When the vehicle is not running or stopped on the detection plate 2, the detection plate 2 is not bent or deformed because the weight of the vehicle is not applied to the detection plate 2.
Next, as shown in fig. 2, it is assumed that the vehicle weight of the running vehicle is applied to the optical fiber sensor 10 that detects the vehicle weight. Since the vehicle is on the detection plate 2, the weight of the vehicle is applied to the detection plate 2 in the direction of arrow 55 in the figure.
As shown, the detection plate 2 is curved in accordance with the weight of the vehicle. A force that pulls the detection plate 2 toward both ends due to bending acts on the lower surface of the detection plate 2 on which the fiber bragg grating 1 is mounted. As the lower surface of the detection plate 2 is pulled, the fiber bragg grating 1 that is closely attached to the detection plate 2 is also pulled.
The fiber bragg grating 1 reflects light of a specific wavelength before being pulled, but the reflected wavelength is changed by tensile strain. Since the change in the reflected wavelength corresponds to the vehicle weight applied to the optical fiber sensor 10 for detecting the vehicle weight, the vehicle weight can be detected and calculated from the wavelength change amount.
Fig. 3 is a characteristic diagram showing a relationship between the vehicle weight and the wavelength change of the fiber bragg grating 1. In the illustrated drawing, the horizontal axis represents the vehicle weight applied to the optical fiber sensor 10 for detecting the vehicle weight, and the vertical axis represents the wavelength change of the light reflected (blocked) by the optical fiber bragg grating 1. As can be seen from the figure, the wavelength of the reflection of the fiber bragg grating 1 varies according to the vehicle weight applied to the fiber optic sensor 10 for detecting the vehicle weight, which is a simple function.
For example, when the vehicle weight W t When the vehicle passes through the optical fiber sensor 10 for detecting the weight of the vehicle, the wavelength of the optical fiber Bragg grating 1 in the figure is changed to lambda t . Therefore, by measuring the amount of change in the wavelength of light reflected from the fiber bragg grating 1, the weight of the vehicle traveling on the fiber sensor 10 that detects the weight of the vehicle can be calculated.
The reflection (blocking) wavelength of the fiber bragg grating 1 also varies with the temperature variation of the detection plate 2 and the fiber bragg grating 1. In the present embodiment, by using a material having a low coefficient of thermal expansion for the detection plate 2, errors in light reflection due to thermal expansion of the detection plate 2 can be suppressed. In addition, instead of suppressing the influence of heat from the surroundings by using a material having a low thermal expansion coefficient for the sensing plate 2, the following embodiment is also effective in reducing measurement errors due to heat.
In addition to the above-described optical fiber sensor 10 for detecting the weight of the vehicle, which is provided with the optical fiber bragg grating 1, one or more temperature compensation optical fiber bragg gratings 1 are provided. The fiber bragg grating 1 for temperature compensation is formed so as to thermally expand and contract at the same thermal expansion coefficient as the fiber bragg grating 1 provided in the fiber optic sensor 10 for detecting the weight of the vehicle. For example, the same shape and the same components as those of the optical fiber sensor 10 for detecting the weight of the vehicle may be formed in the same structure.
Next, when the temperature compensation fiber bragg grating 1 is mounted, it is considered to be mounted in the vicinity of the fiber sensor 10 for detecting the vehicle weight so that the temperature is always the same as the temperature of the fiber sensor 10 for detecting the vehicle weight. However, as described above, the fiber bragg grating 1 for temperature compensation is provided at a structure or a position that is not affected by the weight of the vehicle, so that the fiber bragg grating 1 is not deformed by the weight of the vehicle.
The optical fiber sensor 10 that detects the weight of the vehicle deforms the detection plate 2 due to the weight of the passing vehicle, and deforms the detection plate 2 due to thermal expansion caused by the ambient temperature. Therefore, the change in the reflection wavelength of the light from the fiber bragg grating 1 detected by the fiber sensor 10 that detects the vehicle weight is due to the deformation of the detection plate 2 caused by the vehicle weight and the deformation caused by the thermal expansion.
On the other hand, the deformation of the fiber bragg grating 1 for temperature compensation is caused only by the deformation of the detection plate 2 due to thermal expansion, which corresponds to the change itself due to expansion.
Therefore, by removing the change in the reflected wavelength of light detected by the temperature compensating fiber bragg grating 1 from the change in the wavelength of reflected light from the fiber bragg grating 1 detected by the fiber optic sensor 10 for detecting the vehicle weight, the vehicle weight becomes possible to detect only the change caused by the vehicle weight detected by the fiber optic sensor 10 for detecting the vehicle weight.
As described above, the vehicle weight can be detected by the optical fiber sensor 10 for detecting the vehicle weight having a simple structure in which the optical fiber bragg grating 1 is closely attached to the detection plate 2.
In addition, by using the detection plate 2 made of a material having a low thermal expansion coefficient, the fiber bragg grating 1 mounted on the detection plate 2 can be used as a sensor of the fiber sensor 10 for detecting the weight of a vehicle, which is not easily affected by changes in the ambient temperature. Since the optical fiber bragg grating 1 is provided in the optical fiber 6 and the optical fiber bragg grating 1 portion is small in diameter and short in length, no adverse effect is caused to the detection plate 2.
Further, by providing 1 or more temperature compensating fiber bragg gratings 1 separately from the fiber bragg gratings 1 for the fiber optic sensor 10 for detecting the vehicle weight, the wavelength change of the fiber optic sensor 10 for detecting the vehicle weight due to the change in the ambient temperature can be eliminated.
Next, an example of the optical fiber sensor 15 for detecting the weight of the vehicle by applying compressive deformation of the optical fiber bragg grating 1, which is caused by the bending of the detection plate 2 due to the weight of the vehicle, to the up-down movement amount will be described.
Fig. 4 is a block diagram showing the structure of the vehicle weight detecting optical fiber sensor 15 for detecting the vehicle weight based on the compression strain of the optical fiber bragg grating 1. Fig. 5 is a configuration diagram showing a state in which the vehicle weight is applied to the optical fiber sensor 15 for vehicle weight detection.
As shown in fig. 4, in the optical fiber sensor 15 for vehicle weight detection, the optical fiber bragg grating 1 is provided between the detection plate 2 and the fixing plate 3 which are bent by the weight of the vehicle, and a compressive load is applied to the optical fiber bragg grating 1 to detect the weight of the vehicle.
Specifically, the optical fiber bragg grating 1 provided on an optical fiber, not shown, is vertically mounted at the substantially center of the lower surface of the detection plate 2, and the optical fiber bragg grating 1 is fixed by mounting the lower end of the optical fiber bragg grating 1 on the upper surface of the fixing plate 3. The fixing plate 3 supports the lower end of the fiber bragg grating 1. By supporting the lower end of the fiber bragg grating 1 with the fixing plate 3, the curvature of the detection plate 2 compresses the fiber bragg grating 1 and provides compressive strain.
The detection plate 2 is deformed by an external force, both ends are fixed, and a center portion of the detection plate 2 has a structure that is bent according to a weight of a vehicle when the vehicle passes. The fiber bragg grating 1 is provided with a grating along the optical fiber in the loading direction (vertical direction).
The curvature change of the detection plate 2 caused by the vehicle weight is determined for the detection plate 2, so that the fiber bragg grating 1 can fully detect the pressure strain, and the fiber bragg grating 1 is not damaged due to excessive compression.
The fixing plate 3 is made of rigid materials, is not easy to deform by external force, and is buried below the detection plate 2 arranged on the road surface.
Next, as shown in fig. 5, it is assumed that the vehicle weight is applied to the optical fiber sensor 15 for vehicle weight detection. When the vehicle passes near the center of the detection plate 2, the weight of the vehicle acts on the detection plate 2 in the direction of arrow 55 in the figure to bend the detection plate 2 downward. On the lower surface of the detection plate 2, since the other end of the mounted optical fiber bragg grating 1 is fixed to the fixing plate 3, the detection plate 2 is compressed, and the detection plate 2 is bent and depressed downward by an amount, compression deformation is generated on the optical fiber bragg grating 1.
The fiber bragg grating 1 reflects light of a specific wavelength before compression, but the reflected wavelength changes upon compression. Since the change in the reflected wavelength corresponds to the vehicle weight applied to the optical fiber sensor for vehicle weight detection 15, the vehicle weight can be obtained from the wavelength change amount.
As described above, the compressive strain caused by the deformation of the detection plate 2 is detected by the fiber bragg grating 1, and the weight of the vehicle passing through the vehicle weight detecting fiber optic sensor 15 can be calculated.
Next, an embodiment of the optical fiber sensor 16 for detecting the weight of the vehicle, which measures the weight of the vehicle by applying the vertical movement amount of the detection plate 2 caused by the bending of the vehicle weight as a tensile strain to the optical fiber bragg grating 1, will be described below.
Fig. 6 is a block diagram showing the structure of the vehicle weight detecting fiber sensor 16 for detecting the weight of a vehicle by applying a tensile strain to the fiber bragg grating 1. Fig. 7 is a configuration diagram showing a state in which the vehicle weight is applied to the optical fiber sensor 16 for detecting the vehicle weight.
As shown in fig. 6, in the optical fiber sensor 16 for detecting the weight of the vehicle, the optical fiber bragg grating 1 is arranged between the detection plate 2 and the fixing plate 3 which are bent by the weight of the vehicle, and a compressive load is applied to the optical fiber bragg grating 1 to detect the weight of the vehicle.
Specifically, a traction portion 4 is provided on the lower surface of the detection plate 2, and a holding portion 5 is provided on the fixing plate 3. The holding portion 5 is connected to the upper end of the fiber bragg grating 1, the pulling portion 4 is connected to the lower end of the fiber bragg grating 1, and the bending of the detection plate 2 is configured to apply strain to the fiber bragg grating 1 via the pulling portion 4.
The traction portion 4 has a hook-like (L-shaped) shape, and one end of the traction portion 4 is mounted at a substantially central position of the lower surface of the detection plate 2 and descends together with the central portion. The other end of the traction portion 4 is attached to the lower end of the fiber bragg grating 1 hanging down from the holding portion 5.
The detection plate 2 is composed of an elastic plate, two ends of which are fixed and paved on the road surface. The traction portion 4 is made of a rigid material and is not easily deformed by an external force.
The fiber bragg grating 1 is suspended from the holding portion 5, and the other end is attached to the pulling portion 4 to be elongated without being bent. The fiber bragg grating 1 has a suspended grating formed in a vertical direction, and the interval between the gratings vertically expands and contracts as the fiber bragg grating 1 expands and contracts.
The curvature change of the detection plate 2 caused by the vehicle weight is determined for the detection plate 2, so that the fiber bragg grating 1 can fully detect the tensile strain, and the fiber bragg grating 1 cannot be damaged due to the excessive tensile strain.
The fixing plate 3 is made of rigid materials, is not easy to deform by external force, and is buried below the detection plate 2 arranged on the road surface. The holding portion 5 is made of a rigid material and is not easily deformed by an external force. As shown, the holding portion 5 has a hook shape (inverted L shape), one end of which is attached to the upper surface of the fixing plate 3, and the other end of which suspends the fiber bragg grating 1.
The detection plate 2 is bent at a central portion of the detection plate 2 as the weight of the vehicle passing through the optical fiber sensor 16 for vehicle weight detection sinks in the direction of the arrow 55 shown in the drawing. The pulling portion 4 also lowers the detection plate 2 by the amount of the sagging bending, and the pulling portion 4 stretches the fiber bragg grating 1 downward.
The other end of the fiber bragg grating 1 is suspended by the holding portion 5, and since the holding portion 5 is fixed to the fixing plate 3, the elongation of the fiber bragg grating 1 is the same as the movement amount of the traction portion 4, that is, the amount by which the detection plate 2 sinks down due to the weight of the vehicle. The tensile force caused by the vehicle weight and the wavelength variation reflected by the fiber bragg grating 1 show the same tendency as the characteristics shown in fig. 3, and thus the vehicle weight can be calculated from the wavelength variation.
Next, a system configuration using the optical fiber sensor for detecting the weight of a vehicle according to the present utility model will be described.
Fig. 8 is a block diagram showing an embodiment of a vehicle weight detecting system using the optical fiber sensor for detecting vehicle weight according to the present utility model.
As shown in the figure, the vehicle weight detection system 20 includes an optical fiber sensor 10 that detects the weight of the vehicle, a wavelength meter 12 that incorporates a light source and measures the reflected wavelength, and an optical fiber 6 that connects the optical fiber sensor 10 that detects the weight of the vehicle and the wavelength meter 12 and is used for transmitting light.
The optical fiber sensors 10 for detecting the weight of the vehicle are connected from the wavelength meter 12 through the optical fibers 6, and the optical fiber sensors 10 for detecting the weight of the vehicle are connected in series through the optical fibers 6 to form a sensor single-wire connection mode.
The optical fiber sensor 10 for detecting the weight of the vehicle may be any sensor having the optical fiber bragg grating 1 and capable of detecting the weight of the vehicle, and may be a similar type of sensor, such as the optical fiber sensor 15 for detecting the weight of the vehicle, the optical fiber sensor 16 for detecting the weight of the vehicle.
Light emitted from the light source of the wavelength meter 12 passes through the optical fiber 6 to reach the optical fiber sensor 10 that detects the weight of the vehicle. When the vehicle passes through the optical fiber sensor 10 that detects the weight of the vehicle, the wavelength of the reflected light changes. The reflected light returns to the wavelength measuring instrument 12, and the wavelength of the reflected light is measured, so that the weight of the traveling vehicle can be detected.
Next, another vehicle weight detection system configuration using the vehicle weight detection optical fiber sensor of the present utility model will be described.
Fig. 9 is a block diagram showing another embodiment of a vehicle weight detecting system using the optical fiber sensor for vehicle weight detection of the present utility model.
As shown in the figure, the vehicle weight detection system 21 includes an optical fiber sensor 10 that detects the weight of the vehicle, a wavelength meter 12 that incorporates a light source and measures the reflected wavelength, an optical fiber 6 that connects the optical fiber sensor 10 that detects the weight of the vehicle and the wavelength meter 12 and transmits light, and an optical coupler 11 for connecting paths of the optical fibers 6 in parallel.
If the optical fiber sensor 10 for detecting the weight of the vehicle is a sensor capable of detecting the weight of the vehicle provided with the optical fiber bragg grating 1, a homogeneous sensor such as the optical fiber sensor 15 for detecting the weight of the vehicle by compressive strain and the optical fiber sensor 16 for detecting the weight of the vehicle by tensile strain may be used.
The wiring in the figure is different from the single wire series shown in fig. 1, and forms a parallel system.
Light emitted from a light source of the wavelength measuring instrument 12 is transmitted through the optical fiber 6, branched and transmitted through the optical coupler 11, and reaches the vehicle weight detecting optical fiber sensor. When the vehicle passes through the optical fiber sensor 10 that detects the weight of the vehicle, the wavelength of the reflected light changes. The reflected light is returned to the wavelength meter 12, the wavelength of the reflected light is measured, and the vehicle weight is calculated.
The above-described structures of fig. 8 and 9 require the same number of measuring instruments as compared with the conventional plurality of sensors, and the fiber bragg gratings 1 having different reflection wavelengths can be provided for each of the optical fiber sensors 10 for detecting the weight of the vehicle, to obtain an excellent effect of being able to measure the reflection wavelengths from the plurality of optical fiber sensors 10 for detecting the weight of the vehicle with one wavelength meter 12.
Further, since the weight detection system 20 having the single-line configuration hardly causes attenuation of the wavelength intensity of the optical fiber bragg grating 1, there is an advantage in that it is possible to construct a system that detects the weight of the vehicle by providing a plurality of optical fiber sensors 10 for detecting the weight of the vehicle at a long distance interval and performing weight detection on a wide range of roads.
In the vehicle weight detection system 21 having the parallel structure, even if the optical fiber 6 is cut at the optical coupler 11 at a certain intermediate branch point, light is transmitted to the optical fiber sensor 10 for detecting the vehicle weight in front of the cut optical fiber, and the detection of the optical fiber sensor 10 for detecting the vehicle weight in the connected state is not affected, so that an excellent effect can be obtained in which the system for detecting the vehicle weight on the road is configured as a highly reliable system.
The foregoing description of the preferred embodiments of the utility model is not intended to limit the utility model to the precise form disclosed, and any such modifications, equivalents, and alternatives falling within the spirit and scope of the utility model are intended to be included within the scope of the utility model.
Claims (9)
1. An optical fiber sensor for detecting the weight of a vehicle comprises a detection plate for being arranged on a road to bear the load of the vehicle and bend, and an optical fiber for transmitting light; the method is characterized in that: the optical fiber Bragg grating is arranged in the optical fiber, is fixed on the detection plate and detects the bending of the detection plate caused by the vehicle load.
2. The optical fiber sensor for detecting the weight of a vehicle according to claim 1, wherein: the optical fiber Bragg grating is arranged between a detection plate bent under the action of the weight of the vehicle and a fixed plate, the optical fiber Bragg grating is vertically arranged on the lower surface of the detection plate, the fixed plate supports the lower end of the optical fiber Bragg grating, and compressive strain is applied to the optical fiber Bragg grating when the detection plate is bent under the load of the vehicle.
3. The optical fiber sensor for detecting the weight of a vehicle according to claim 2, wherein: the fiber Bragg grating is vertically arranged in the center of the lower surface of the detection plate.
4. The optical fiber sensor for detecting the weight of a vehicle according to claim 2, wherein: the fixed plate is a rigid piece and is buried below the detection plate arranged on the road surface.
5. The optical fiber sensor for detecting the weight of a vehicle according to claim 1, wherein: the fiber Bragg grating is arranged between a detection plate bent under the action of the weight of the vehicle and a fixed plate, a traction part is arranged on the lower surface of the detection plate, a holding part is arranged on the fixed plate, the holding part is connected with the upper end of the fiber Bragg grating, the traction part is connected with the lower end of the fiber Bragg grating, and the detection plate exerts tensile strain on the fiber Bragg grating when the detection plate is bent under the load of the vehicle.
6. The optical fiber sensor for detecting the weight of a vehicle according to claim 5, wherein: one end of the traction part is arranged in the center of the lower surface of the detection plate, and the other end of the traction part is connected with the lower end of the fiber Bragg grating.
7. The optical fiber sensor for detecting the weight of a vehicle according to claim 5, wherein: the fixed plate is a rigid piece and is buried below the detection plate arranged on the road surface.
8. The optical fiber sensor for detecting the weight of a vehicle according to claim 5, wherein: the traction portion and the holding portion are rigid members.
9. The fiber optic sensor for detecting vehicle weight of claim 8, wherein: the traction part is L-shaped, one end of the traction part is arranged on the lower surface of the detection plate, and the other end of the traction part is arranged on the lower end of the fiber Bragg grating; the holding part is L-shaped, one end of the holding part is connected to the upper surface of the fixing plate, and the other end of the holding part suspends the fiber Bragg grating.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320938755.0U CN220018700U (en) | 2023-04-24 | 2023-04-24 | Optical fiber sensor for detecting weight of vehicle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320938755.0U CN220018700U (en) | 2023-04-24 | 2023-04-24 | Optical fiber sensor for detecting weight of vehicle |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220018700U true CN220018700U (en) | 2023-11-14 |
Family
ID=88678450
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202320938755.0U Active CN220018700U (en) | 2023-04-24 | 2023-04-24 | Optical fiber sensor for detecting weight of vehicle |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220018700U (en) |
-
2023
- 2023-04-24 CN CN202320938755.0U patent/CN220018700U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JP2983018B1 (en) | Optical fiber sensor | |
| EP1124112A2 (en) | Optical fiber sensor | |
| CA1183016A (en) | Microbending of optical fibers for remote force measurement | |
| US7215416B2 (en) | Method for measuring using optical fiber distributed sensor | |
| US9109883B2 (en) | High resolution large displacement/crack sensor | |
| KR100984378B1 (en) | Vehicle axle weighing device | |
| WO2003078932A1 (en) | Monitoring of large structures using brillouin spectrum analysis | |
| US10620018B2 (en) | Method for measuring the displacement profile of buildings and sensor therefor | |
| JP4403674B2 (en) | Optical fiber sensor | |
| CN113358047B (en) | Bridge body deformation form measuring device and method based on inclination angle and vibration sensing mechanism | |
| CN220018700U (en) | Optical fiber sensor for detecting weight of vehicle | |
| CN112484656A (en) | Optical fiber type convergence meter and using method thereof | |
| JP2005024427A (en) | Optical fiber sensor for vehicle weight detection | |
| KR20180081347A (en) | Optical fiber sensor system including optical fiber sensor module of cantilever beam structure | |
| JP3860488B2 (en) | Wide-area strain distribution measurement system | |
| EP3842766A1 (en) | Apparatus for measuring displacement of slope surface by using optical fiber bragg grating sensor | |
| JP3373188B2 (en) | Displacement measurement system using optical fiber | |
| US20060159385A1 (en) | Extensometer comprising a flexible sensing element and bragg gratings | |
| JPH11101617A (en) | Structure strain monitoring method and its monitoring device | |
| Suopajaervi et al. | Fiber optic sensors for traffic monitoring applications | |
| JP3544861B2 (en) | Measurement target section identification method | |
| JP2002213927A (en) | Optical fiber strain sensor | |
| KR101166182B1 (en) | The clinometer/accelerometer using Optical fiber sensor | |
| WO2007043716A1 (en) | Optical fiber bragg grating unit and apparatus and method of measuring deformation of structure having the same | |
| US20240337522A1 (en) | In-motion weighing system for motor vehicles based on rigid and fiber optic sensors |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |