CN110108340B - Dynamic weighing device for automobile - Google Patents
Dynamic weighing device for automobile Download PDFInfo
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- CN110108340B CN110108340B CN201910481107.5A CN201910481107A CN110108340B CN 110108340 B CN110108340 B CN 110108340B CN 201910481107 A CN201910481107 A CN 201910481107A CN 110108340 B CN110108340 B CN 110108340B
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- 238000005303 weighing Methods 0.000 title claims abstract description 113
- 239000000835 fiber Substances 0.000 claims abstract description 105
- 230000003287 optical effect Effects 0.000 claims abstract description 86
- 238000012360 testing method Methods 0.000 claims abstract description 51
- 238000000034 method Methods 0.000 claims abstract description 9
- 230000008569 process Effects 0.000 claims abstract description 7
- 238000001914 filtration Methods 0.000 claims abstract description 5
- 239000013307 optical fiber Substances 0.000 claims description 23
- 239000000463 material Substances 0.000 claims description 4
- 238000001514 detection method Methods 0.000 description 16
- 230000008859 change Effects 0.000 description 12
- 238000010586 diagram Methods 0.000 description 12
- 238000012544 monitoring process Methods 0.000 description 5
- 238000001228 spectrum Methods 0.000 description 5
- 230000001133 acceleration Effects 0.000 description 4
- 238000009434 installation Methods 0.000 description 4
- 238000012545 processing Methods 0.000 description 4
- 230000035882 stress Effects 0.000 description 4
- 238000013528 artificial neural network Methods 0.000 description 3
- 238000004891 communication Methods 0.000 description 3
- 230000007547 defect Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 230000007797 corrosion Effects 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 230000008878 coupling Effects 0.000 description 2
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- 238000005859 coupling reaction Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 230000035945 sensitivity Effects 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000005253 cladding Methods 0.000 description 1
- 230000001595 contractor effect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000006355 external stress Effects 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
- 230000008054 signal transmission Effects 0.000 description 1
- 238000000411 transmission spectrum Methods 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01G—WEIGHING
- G01G19/00—Weighing apparatus or methods adapted for special purposes not provided for in the preceding groups
- G01G19/02—Weighing apparatus or methods adapted for special purposes not provided for in the preceding groups for weighing wheeled or rolling bodies, e.g. vehicles
- G01G19/03—Weighing apparatus or methods adapted for special purposes not provided for in the preceding groups for weighing wheeled or rolling bodies, e.g. vehicles for weighing during motion
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01G—WEIGHING
- G01G23/00—Auxiliary devices for weighing apparatus
- G01G23/48—Temperature-compensating arrangements
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- Length Measuring Devices By Optical Means (AREA)
- Measuring Temperature Or Quantity Of Heat (AREA)
Abstract
The invention discloses an automobile dynamic weighing device, comprising: a weighing platform; a broadband light source; the fiber bragg grating strain sensor is used for sensing deformation of the weighing platform after receiving the optical signals to obtain deformed optical signals; the fiber bragg grating temperature sensor is used for sensing the ambient temperature of the weighing platform after receiving the optical signal to obtain a temperature optical signal; the fiber bragg grating sensing demodulation system is used for filtering temperature optical signals doped in the deformation optical signals and demodulating the filtered deformation optical signals to obtain the weight of each shaft of the automobile; the infrared whole-vehicle separator is used for tracking and confirming the whole process from entering the test area to exiting the test area, sending a start signal when the vehicle enters the test area and sending an end signal when the vehicle exits the test area; and the controller is used for receiving the weight of each shaft of the same automobile in the test area and obtaining the weight of the automobile. The dynamic weighing device for the automobile can improve the weighing precision.
Description
Technical Field
The invention relates to the technical field of automobile weighing, in particular to an automobile dynamic weighing device.
Background
At present, various automobile weighing machines such as resistance strain gauge type, piezoelectric type, capacitance type and the like are commonly used for dynamically weighing highway automobile weighing machines in China, but the defects of large measurement accuracy error, need of frequent debugging and calibration, large volume and weight, need of professional personnel for installation and maintenance, poor environmental adaptability, easiness in interference by electromagnetic force, temperature, humidity, impact force and the like exist.
In recent years, a certain development and achievement of a weighing detection technology are achieved, and particularly, a detection system developed by applying a sensor metering theory realizes a new breakthrough, and the metering speed and the metering precision are improved to a great extent. For example, chinese patent CN200320127306.0 proposes a balance body, a data acquisition control device and a function detection component, where the function detection component includes an infrared alignment tube for detecting a vehicle, a hall sensor for detecting a vehicle speed, a wheel base and the number of tires, a weight sensor for detecting a weight, and a signal line is connected to the data acquisition controller. The device of the truck scale requires that the front and rear wheel axles of the tested vehicle pass through the weighing platform at a constant speed during testing, and the total weight of the vehicle is obtained by accumulating the wheel axle data obtained by the weighing sensor arranged under the weighing platform. In the actual test, a strict uniform speed does not exist, so that a certain error is generated in the test. Chinese patent CN200810163397.0 proposes a weighing channel, a weighing platform disposed on the weighing channel, a data acquisition and processing device, and further includes a wheel axle identifier, an image collector, etc., where the image collector can analyze and calculate the running speed and acceleration of the vehicle, so as to correct the weighing result and improve the accuracy. However, the two weighing devices adopt the traditional weighing sensor and are limited by factors such as position, time and the like, so that the two devices have the defects of low sensitivity, large zero drift, large nonlinearity under a large strain state, low precision, poor electromagnetic interference resistance, poor corrosion resistance and the like. Aiming at the traditional electric strain sensor, chinese patent CN200510010507.6 proposes a weighing detection device based on an optical fiber Bragg grating sensor, which consists of a sensor, a weighing bearing device, a demodulation device, a data acquisition device and a data processing device, wherein the weighing device is arranged on the ground and consists of a bearing plate, a buffer layer, a support and a foundation, the two supports are fixed on the foundation, the two ends of the bearing plate are fixed on the supports, the buffer layer is positioned between the bearing plate and the foundation, and at least three sensors are symmetrically distributed on the bearing plate of the weighing bearing device. The automobile weighing detection by utilizing the fiber bragg grating technology overcomes the defects of the traditional electric strain sensor and has the performances of electromagnetic interference resistance, insulation, high temperature resistance, corrosion resistance and the like. However, this patent needs to lay the fiber grating sensor on the bearing device of multilayer structure to weigh, the structure is more complicated, the installation is more complicated, and test time is shorter, do not consider the influence of different temperatures on the mechanical properties of bearing device itself, namely do not consider the indirect influence of temperature to weighing accuracy, because the fiber grating sensor divide into strain sensor and temperature sensor, the fiber grating wavelength of strain sensor is sensitive to temperature and strain simultaneously, namely temperature and strain cause fiber grating coupling wavelength to move simultaneously, make through measuring fiber grating coupling wavelength to move can't distinguish temperature and strain, temperature sensor can only measure the change of temperature size in the environment, not receive the influence of strain change, if the system only installs strain sensor, then temperature variable is not the independent monitoring of method, so this technique has disadvantages such as weighing accuracy is low.
Disclosure of Invention
The invention aims to provide an automobile dynamic weighing device which can improve weighing precision.
In order to achieve the above object, the present invention provides the following solutions:
an automotive dynamic weighing device comprising:
the weighing platform is arranged on the road surface of the test area and is used for bearing deformation caused by the weight of each shaft of the automobile;
a broadband light source for generating an optical signal;
the fiber bragg grating strain sensor is arranged on the weighing platform, connected with the broadband light source and used for sensing deformation of the weighing platform after receiving the light signals to obtain deformed light signals;
the fiber bragg grating temperature sensor is arranged on the weighing platform, connected with the broadband light source and used for sensing the ambient temperature of the weighing platform after receiving the light signals to obtain temperature light signals;
the fiber bragg grating sensing demodulation system is respectively connected with the fiber bragg grating strain sensor and the fiber bragg grating temperature sensor and is used for filtering the temperature optical signals doped in the deformation optical signals and demodulating the filtered deformation optical signals to obtain the weight of each shaft of the automobile;
the infrared whole car separator is arranged in the test area and is used for tracking and confirming the whole process from entering the test area to exiting the test area, sending a start signal when the car enters the test area and sending an end signal when the car exits the test area;
and the controller is respectively connected with the infrared whole car separator and the fiber bragg grating sensing demodulation system and is used for receiving the weight of each shaft of the same car in the test area and obtaining the weight of the car.
Optionally, the controller includes:
the control chip is connected with the infrared whole vehicle separator and is used for sending out a summation instruction according to the starting signal and sending out a summation stopping instruction according to the ending signal;
and the adder is respectively connected with the control chip and the fiber bragg grating sensing demodulation system, and is used for receiving the adding instruction, receiving the weight of each shaft, adding the weight of each shaft of the same automobile and stopping adding according to the adding stopping instruction.
Optionally, the dynamic weighing device for an automobile further comprises:
the triggering sensor is arranged in the test area and connected with the broadband light source and is used for sending an opening signal to the broadband light source when the automobile enters the test area, and the broadband light source generates the optical signal according to the opening signal.
Optionally, the dynamic weighing device for an automobile further comprises:
the optical fiber coupler is further connected with the broadband light source, the fiber grating strain sensor and the fiber grating temperature sensor, the optical splitter is further connected with the fiber grating sensing demodulation system, the fiber coupler is used for splitting the optical signals to the fiber grating strain sensor and the fiber grating temperature sensor, combining the deformation optical signals and the temperature optical signals to the optical splitter, and the optical splitter divides the combined deformation optical signals and temperature optical signals into deformation optical signals and temperature optical signals and sends the deformation optical signals and the temperature optical signals to the fiber grating sensing demodulation system.
Optionally, the dynamic weighing device for an automobile further comprises:
and the optical detector is respectively connected with the optical fiber coupler and the optical splitter and is used for converting the combined deformation optical signals and temperature optical signals into electric signals and transmitting the electric signals to the optical splitter.
Optionally, the dynamic weighing device for an automobile further comprises:
the tire identifier is arranged in the test area, connected with the infrared whole vehicle separator, and used for starting and identifying whether the automobile tire is a single tire or a double tire according to the starting signal and stopping identification according to the ending signal.
Optionally, the dynamic weighing device for an automobile further comprises:
the license plate recognition system is arranged in the test area, connected with the infrared whole vehicle separator, and used for starting and recognizing the license plate number of the vehicle according to the starting signal and stopping recognition according to the ending signal.
Optionally, the dynamic weighing device for an automobile further comprises:
the vehicle type recognition system is arranged in the test area, connected with the infrared whole vehicle separator, and used for starting and recognizing the vehicle type of the vehicle according to the start signal and stopping recognition according to the end signal.
Optionally, the weighing platform is a layer of constant-strength beam.
Optionally, the fiber grating strain sensor and the fiber grating temperature sensor each include 4, and each fiber grating strain sensor and each fiber grating temperature sensor are respectively disposed at four corners of the weighing platform.
According to the specific embodiment provided by the invention, the invention discloses the following technical effects: the invention discloses an automobile dynamic weighing device, wherein a fiber grating strain sensor and a fiber grating temperature sensor are arranged on a weighing platform, deformation caused by the weight of an automobile is monitored through the fiber grating strain sensor, a deformed light signal is obtained, temperature change caused by the external temperature is monitored through the fiber grating temperature sensor, a temperature light signal is obtained, the doped temperature light signal in the deformed light signal is filtered through a fiber grating sensing demodulation system, and the deformed light signal with temperature interference filtered is demodulated, so that accurate automobile weight information is obtained. According to the invention, the fiber bragg grating temperature sensor is arranged, the influence of temperature on the bearing device and the weighing precision is considered, and the change caused by the temperature is compensated in a final result, so that the weighing precision is improved. The automobile dynamic weighing device disclosed by the invention can dynamically weigh the automobile in real time and judge whether the automobile is overloaded or not.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions of the prior art, the drawings that are needed in the embodiments will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a block diagram of an embodiment of an automotive dynamic weighing apparatus of the present invention;
FIG. 2 is a block diagram of a weighing platform in an embodiment of an automotive dynamic weighing apparatus of the present invention;
FIG. 3 is a schematic diagram of axle set identification in an embodiment of an automotive dynamic weighing apparatus according to the present invention;
FIG. 4 is a diagram of a fiber grating structure in an embodiment of the dynamic weighing apparatus of the present invention;
FIG. 5 is a schematic diagram of a fiber grating in a normal state in an embodiment of the dynamic weighing device of the present invention;
FIG. 6 is a schematic diagram of a fiber grating in a pulled/pressed state in an embodiment of the dynamic weighing apparatus of the present invention;
FIG. 7 is a waveform diagram of incident light of a fiber grating in a pulled/pressed state in an embodiment of an automobile dynamic weighing apparatus according to the present invention;
FIG. 8 is a waveform diagram of the reflected light from the fiber grating in the pulled/pressed state in an embodiment of the dynamic weighing apparatus for an automobile according to the present invention;
FIG. 9 is a waveform diagram of the transmitted light of the fiber grating in the pulled/pressed state in an embodiment of the dynamic weighing apparatus for an automobile according to the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The invention aims to provide an automobile dynamic weighing device which can improve weighing precision.
In order that the above-recited objects, features and advantages of the present invention will become more readily apparent, a more particular description of the invention will be rendered by reference to the appended drawings and appended detailed description.
FIG. 1 is a block diagram of an embodiment of an automotive dynamic weighing apparatus of the present invention. Referring to fig. 1, the automobile dynamic weighing device comprises a weighing platform 101, a broadband light source 102, a fiber bragg grating strain sensor 103, a fiber bragg grating temperature sensor 104, a fiber bragg grating sensing demodulation system 105, an infrared whole automobile separator 106 and a controller 107.
The weighing platform 101 is arranged on the road surface of the test area and is used for bearing deformation caused by the weight of each shaft of the automobile.
The broadband light source 102 is used to generate an optical signal.
The fiber bragg grating strain sensor 103 is disposed on the weighing platform 101 and connected to the broadband light source 102, and is configured to sense deformation of the weighing platform 101 after receiving the optical signal, so as to obtain a deformed optical signal.
The fiber bragg grating temperature sensor 104 is disposed on the weighing platform 101, connected to the broadband light source 102, and configured to sense an ambient temperature of the weighing platform 101 after receiving the light signal, so as to obtain a temperature light signal.
The fiber bragg grating sensing demodulation system 105 is respectively connected with the fiber bragg grating strain sensor 103 and the fiber bragg grating temperature sensor 104, and is used for filtering the temperature optical signals doped in the deformation optical signals, and demodulating the filtered deformation optical signals to obtain the weight of each shaft of the automobile.
The infrared whole car separator 106 is arranged in the test area, and is used for tracking and confirming the whole process from entering the test area to exiting the test area, sending a start signal when the car enters the test area, and sending an end signal when the car exits the test area.
The infrared whole car separator 106 can track and confirm the whole process of the test car from entering the detection zone to exiting the detection zone, and can transmit signals to the controller when the car enters the detection zone and exits the detection zone, because the strain sensor tests strain information, which strain information is one car cannot be judged, which strain information is one car can be judged through the information of the infrared separator, and then the weight strain information of the car is summarized to be the weight of the whole car.
The controller 107 is respectively connected with the infrared whole car separator 106 and the fiber bragg grating sensing demodulation system 105, and is used for receiving the weight of each shaft of the same car in the test area, and obtaining the weight of the car.
In this embodiment, the controller 107 is wirelessly connected to the infrared whole vehicle separator 106.
The controller 107 includes a control chip and an adder.
The control chip is connected with the infrared whole vehicle separator 106 and is used for sending out an addition instruction according to the starting signal and sending out an addition stopping instruction according to the ending signal.
The adder is connected with the control chip and the fiber bragg grating sensing demodulation system 105 respectively, and is used for receiving the adding instruction, receiving the weight of each shaft, adding the weight of each shaft of the same automobile, and stopping adding according to the adding stopping instruction.
The dynamic weighing device of the automobile further comprises a trigger sensor 108, an optical fiber coupler 109, a beam splitter 110, a light detector 111, a tire identifier 112, a license plate identification system 113 and a vehicle type identification system 114.
The trigger sensor 108 is disposed in the test area and connected to the broadband light source 102, and is configured to send an on signal to the broadband light source 102 when the automobile enters the test area, and the broadband light source 102 generates the optical signal according to the on signal.
In this embodiment, the trigger sensor 108 is wirelessly connected to the controller 107, which is connected to the broadband light source 102, and the broadband light source is controlled by the controller 107 to generate the optical signal.
The optical fiber coupler 109 and the optical fiber coupler 110 are connected to each other, the optical fiber coupler 109 is further connected to the broadband light source 102, the optical fiber grating strain sensor 103 and the optical fiber grating temperature sensor 104, the optical fiber coupler 110 is further connected to the optical fiber grating sensing demodulation system 105, the optical fiber coupler 109 is used for branching the optical signal to the optical fiber grating strain sensor 103 and the optical fiber grating temperature sensor 104, and combining the deformed optical signal and the temperature optical signal to the optical fiber splitter 110, and the optical splitter 110 divides the combined deformed optical signal and temperature optical signal into a deformed optical signal and a temperature optical signal and then sends the deformed optical signal and the temperature optical signal to the optical fiber grating sensing demodulation system 105.
The optical detector 111 is connected to the optical fiber coupler 109 and the optical splitter 110, and is configured to convert the combined deformed optical signal and temperature optical signal into an electrical signal, and transmit the electrical signal to the optical splitter.
The tire identifier 112 is disposed in the test area, connected to the infrared whole vehicle separator 106, and is configured to start identifying whether the vehicle tire is a single tire or a double tire according to the start signal, and stop identifying according to the end signal.
In this embodiment, the tire identifier 112 is provided with only to 20 pressure-sensitive sensors (each spaced by 10 cm) on the road surface on the side of the center line of the passage, the number of contact points between the tire and the ground can be detected by the pressure-sensitive sensors when the vehicle passes, and data l is generated when the wheel is pressed to the pressure-sensitive sensors, otherwise data 0 is generated. The singlechip connected with the pressure-sensitive sensor reads the data, and when the data is continuous, the data is identified as a tire. For example: the data of the double tires is 001101100000, the data of the single tires is 001100000000, and the type of the automobile can be judged by detecting the number of the tires.
The tyre identifier is used for identifying whether the vehicle is a single tyre or a double tyre, the data processing center compares and analyzes the types of the vehicles, calculates the axle number, the axle distance, the vehicle speed, the acceleration and the like of the vehicles, comprehensively utilizes the functions of the infrared whole vehicle separator to track and confirm the whole process from the entering detection area to the exiting detection area of the detected vehicles, and timely transmits and sends interrupt signal passing information to the controller when the detected vehicles enter the detection area and exit the detection area, so that the controller automatically judges according to the signals sent by the infrared whole vehicle separator, and calculates the total weight of the detected vehicles according to the total weight of the passing information.
The vehicle speed detection is fixed by the distance d between the tire identifier and the weighing platform, and the distance between the tire identifier and the weighing platform is generally less than 1m, so that the vehicle can be considered to pass at a constant speed, and the vehicle speed can be detected by the time t that the vehicle passes through the tire identifier and the weighing platform: v=d/t.
And the axle set detection judges the single axle, double axle or triple axle through the vehicle speed v and the adjacent signal time t of the tire identifier. For example, referring to FIG. 3, when each axle passes through the tire identifier, the time difference between every two is t 1 、t 2 、t 3 D can be obtained 1 ＝v*t 1 、d 2 ＝v*t 2 、d 3 ＝v*t 3 If the distance d is greater than the set value, it can be determined that A, B is uniaxial and C, D is double-axis.
The license plate recognition system 113 is disposed in the test area, connected to the infrared whole car separator 106, and configured to start and recognize a license plate number of the car according to the start signal, and stop recognition according to the end signal.
In this embodiment, the license plate recognition system 113 adopts a mature license plate recognition system, and can start license plate recognition equipment in the video monitoring system while a vehicle drives through the weighing platform 101, collect license plate image data through the image acquisition module, and obtain a license plate number through image algorithm processing.
The vehicle type recognition system 114 is disposed in the test area, connected to the infrared whole vehicle separator 106, and is configured to start recognizing a vehicle type of the vehicle according to the start signal, and stop recognizing according to the end signal.
In this embodiment, 4 identical test areas are provided, each including 1 weigh platform, 4 fiber bragg grating strain sensors 103, 4 fiber bragg grating temperature sensors 104, one tire identifier 112, 2 trigger sensors 108, and 1 infrared whole car separator 106.
In this embodiment, the fiber bragg grating strain sensor 103 and the fiber bragg grating temperature sensor 104 are both fiber bragg grating sensors. The fiber grating sensing demodulation system 105 is a fiber grating sensing demodulation system with a temperature compensation function. Signal transmission is achieved through optical fibers.
According to the dynamic weighing device for the automobile, when the automobile passes through the test area and passes through the trigger sensor, an interrupt signal is generated, and according to the interrupt signal, the weighing device sends out an instruction to control the fiber bragg grating strain sensor and the fiber bragg grating temperature sensor to start to weigh, and light wave signals output by the fiber bragg grating sensor start to be collected and converted into information such as measured weight, speed and temperature. The change of the optical signal collected by the strain sensor has a linear relation with the weight, and the optical wave signal is converted into the weight through a neural network algorithm. The speed can be measured by the tire identifier, the optical signals collected by the temperature sensor can be directly converted into temperature by a formula, and the temperature is sent to the data processing center according to a agreed communication protocol.
The tire identifier detects the type of the vehicle according to the characteristics of the wheel axle of the vehicle, obtains license plate numbers through license plate identification equipment, and transmits data such as vehicle type classification, license plate numbers and the like to the monitoring analysis processing unit through the serial communication interface.
When the vehicle passes through the weighing platform, the weight of each shaft of the vehicle can act on the weighing platform through tires on two sides, the strain sensor outputs optical signals in direct proportion to the weight, when the vehicle is pressed on the weighing platform, the weighing platform deforms, the strain sensor arranged on the weighing platform is simultaneously deformed by pressure, one end of the demodulation equipment sends out optical signals, the optical signals are transmitted to the sensor through a link and reflected in the sensor, the central wavelength of the reflection can be changed due to the deformation of the sensor, the demodulation equipment obtains the corresponding optical signal variation by detecting the variation of the central wavelength of the reflection, and the weight of each shaft is transmitted to the controller through an optical fiber.
The fiber grating sensing demodulation system is a high-speed demodulation device, and the device integrates a wavelength demodulation algorithm and a physical quantity conversion algorithm, so that an optical signal of the wavelength offset can be demodulated into related physical quantities to be measured, such as weight, speed, acceleration, temperature and the like in real time.
The fiber bragg grating sensing demodulation system not only can collect the light signal variation of weighing (the variation of the grating reflection center wavelength) in real time and demodulate the measured light signal variation, but also can effectively reduce or even eliminate the influence caused by the fact that the temperature and the vehicle running speed are the measured other parameters, and the demodulated information can be transmitted to the data processing center in real time through the communication subsystem so as to realize remote control and management; in turn, the data processing center can configure various parameters of the demodulation device according to actual requirements, so that the dynamic weighing device of the automobile is more flexible and effective. The data processing center calculates whether the vehicle is overloaded or not and the specific number of the overloaded vehicles according to the obtained total weight of the vehicle and the detected vehicle type classification.
The data processing center is provided with an autonomously developed software system, can receive information demodulated by the demodulation device in real time, synthesizes multiple factors according to a neural network algorithm, corrects weight information directly detected by the demodulation device, finally generates monitoring reports of vehicle types, license plate numbers, total vehicle loads, overload quantity, speed and the like, displays the monitoring reports on the client terminal, and after the vehicle passes through a test area, the demodulation device collects optical signal quantity of sensor change, at the moment, the data is only optical data, the optical data has a direct linear relation with weight, and the optical data is directly converted into weight information through the neural network algorithm. The software system of the data processing center is simple to operate, and workers can quickly master the usage of the software system, so that whether the measured data is in a normal range or not can be accurately detected and monitored, and the on-site workers can be conveniently guided to take corresponding measures.
Fig. 2 is a block diagram of a weighing platform in an embodiment of an automotive dynamic weighing apparatus of the present invention. Referring to fig. 2, the weighing platform 101 is a layer of uniform-strength beams, and the weighing platform 101 is optimized compared with a multi-layer bearing structure, so that the installation is simpler.
The fiber bragg grating strain sensor 103 and the fiber bragg grating temperature sensor 104 each comprise 4, and each fiber bragg grating strain sensor 103 and each fiber bragg grating temperature sensor 104 are respectively arranged at four corners of the weighing platform 101.
The weighing platform 101 adopts four fiber bragg grating strain sensors 103 and four fiber bragg grating temperature sensors 104, and is respectively installed at four corners of the weighing platform 101, adjacent fiber bragg grating sensors are connected end to end through optical fibers and finally connected in series, the sensors are installed on a sensing beam, the sensing beam is an equal-strength beam, the maximum normal stress on each cross section area of the beam is equal, and the maximum normal stress of the material is reached, so that the material can be saved, and the bearing capacity of the structure can be improved through the structural design. Therefore, after the automobile passes through the system, the axial stress of the weighing platform 101 is uniform, so that the output waveform of the grating is more stable and is not easy to distort, the strain in the axial direction is uniform, the output waveform of the grating can be effectively prevented from widening, distorting and the like, the weighing platform 101 is a bearing device for bearing the weight of the automobile and loading cargoes, the bearing weight is transmitted to the fiber grating strain sensor, the strain sensor monitors the strain change caused by the weight, and the weighing device has the advantages of simple structure, convenience in installation and quite stable working state.
FIG. 4 is a diagram of a fiber grating structure in an embodiment of the dynamic weighing apparatus of the present invention. Referring to fig. 4, a fiber grating is a fiber having a certain length (typically only 10 mm), in which the refractive index is periodically changed in the core 401 or cladding 402 of the fiber, so that light satisfying the bragg condition (λ=2neff Λ, where neff is the effective refractive index of the grating and Λ is the grating period) can be reflected. When a broad spectrum, such as the incident spectrum 403 in fig. 4, passes through the fiber bragg grating, it is reflected back to a monochromatic light, such as the reflection spectrum 404 in fig. 4, by the grating. A grating 405 is disposed in the core 401 and the incident spectrum 403 passes through the fiber bragg grating to produce a transmission spectrum 406.
Fiber bragg gratings are a physical generic term, and the grating principle inside each fiber bragg grating sensor is the same, but different sensor processes, packages, sizes, sensitivities, materials and the like are different. The fiber Bragg grating is the most common fiber Bragg grating, and is a narrow-band reflection filtering passive device with excellent performance. When the Bragg grating is subjected to external stress (strain), the grating period can change, and the photoelastic effect can cause the change of the effective refractive index of the grating; when the Bragg grating is influenced by external temperature, the thermal expansion and contraction effect can also change the period of the grating, meanwhile, the thermosensitive effect can lead to the change of the effective refractive index of the grating, and the sensor based on the fiber Bragg grating principle basically directly or indirectly utilizes strain or temperature to change the central wavelength of the grating, thereby achieving the purpose of testing the measured physical quantity.
Fig. 5 and 6 are schematic views of the fiber grating in a normal state and a pull/push state, respectively. In actual engineering, if a point to be detected is subjected to changes such as strain, temperature, pressure, displacement and acceleration, the wavelength of reflected light changes, and fig. 7, 8 and 9 are respectively a waveform of incident light, a waveform of reflected light and a waveform of transmitted light, so that the stress and other conditions of the point can be detected by detecting the changes of the wavelength, and the safety condition of the detected position or physical quantity can be further determined.
In practical application, the demodulation device can continuously emit a wide spectrum for detecting whether the fiber grating is influenced by the outside. When the grating is pulled and pressed, the central wavelength of the reflection spectrum changes. The demodulation device collects corresponding environmental changes by detecting the reflected changes in the center wavelength.
In the present specification, each embodiment is described in a progressive manner, and each embodiment is mainly described in a different point from other embodiments, and identical and similar parts between the embodiments are all enough to refer to each other.
The principles and embodiments of the present invention have been described herein with reference to specific examples, the description of which is intended only to facilitate an understanding of the system of the present invention and its core ideas; also, it is within the scope of the present invention to be modified by those of ordinary skill in the art in light of the present teachings. In view of the foregoing, this description should not be construed as limiting the invention.
Claims (8)
1. An automotive dynamic weighing device, comprising:
the weighing platform is arranged on the road surface of the test area and is used for bearing deformation caused by the weight of each shaft of the automobile;
a broadband light source for generating an optical signal;
the fiber bragg grating strain sensor is arranged on the weighing platform, connected with the broadband light source and used for sensing deformation of the weighing platform after receiving the light signals to obtain deformed light signals;
the fiber bragg grating temperature sensor is arranged on the weighing platform, connected with the broadband light source and used for sensing the ambient temperature of the weighing platform after receiving the light signals to obtain temperature light signals;
the fiber bragg grating sensing demodulation system is respectively connected with the fiber bragg grating strain sensor and the fiber bragg grating temperature sensor and is used for filtering the temperature optical signals doped in the deformation optical signals and demodulating the filtered deformation optical signals to obtain the weight of each shaft of the automobile;
the infrared whole car separator is arranged in the test area and is used for tracking and confirming the whole process from entering the test area to exiting the test area, sending a start signal when the car enters the test area and sending an end signal when the car exits the test area;
the controller is respectively connected with the infrared whole car separator and the fiber bragg grating sensing demodulation system and is used for receiving the weight of each shaft of the same car in the test area to obtain the weight of the car;
the weighing platform is a layer of constant-strength beam; the fiber bragg grating strain sensors and the fiber bragg grating temperature sensors are respectively arranged at four corners of the weighing platform, wherein the fiber bragg grating strain sensors and the fiber bragg grating temperature sensors comprise 4; the weighing platform adopts four fiber bragg grating strain sensors and four fiber bragg grating temperature sensors, the four fiber bragg grating strain sensors and the four fiber bragg grating temperature sensors are respectively arranged at four corners of the weighing platform, adjacent fiber bragg grating sensors are connected end to end through optical fibers and finally connected in series, the sensors are arranged on a sensing beam, the sensing beam is an equal-strength beam, and the maximum positive stress on each cross section area of the beam is equal and reaches the allowable stress of materials.
2. The vehicle dynamic weighing apparatus of claim 1, wherein said controller comprises:
the control chip is connected with the infrared whole vehicle separator and is used for sending out a summation instruction according to the starting signal and sending out a summation stopping instruction according to the ending signal;
and the adder is respectively connected with the control chip and the fiber bragg grating sensing demodulation system, and is used for receiving the adding instruction, receiving the weight of each shaft, adding the weight of each shaft of the same automobile and stopping adding according to the adding stopping instruction.
3. The vehicle dynamic weighing apparatus of claim 1, further comprising:
the triggering sensor is arranged in the test area and connected with the broadband light source and is used for sending an opening signal to the broadband light source when the automobile enters the test area, and the broadband light source generates the optical signal according to the opening signal.
4. The vehicle dynamic weighing apparatus of claim 1, further comprising:
the optical fiber coupler is further connected with the broadband light source, the fiber grating strain sensor and the fiber grating temperature sensor, the optical splitter is further connected with the fiber grating sensing demodulation system, the fiber coupler is used for splitting the optical signals to the fiber grating strain sensor and the fiber grating temperature sensor, combining the deformation optical signals and the temperature optical signals to the optical splitter, and the optical splitter divides the combined deformation optical signals and temperature optical signals into deformation optical signals and temperature optical signals and sends the deformation optical signals and the temperature optical signals to the fiber grating sensing demodulation system.
5. The vehicle dynamic weighing apparatus of claim 4, further comprising:
and the optical detector is respectively connected with the optical fiber coupler and the optical splitter and is used for converting the combined deformation optical signals and temperature optical signals into electric signals and transmitting the electric signals to the optical splitter.
6. The vehicle dynamic weighing apparatus of claim 1, further comprising:
the tire identifier is arranged in the test area, connected with the infrared whole vehicle separator, and used for starting and identifying whether the automobile tire is a single tire or a double tire according to the starting signal and stopping identification according to the ending signal.
7. The vehicle dynamic weighing apparatus of claim 1, further comprising:
the license plate recognition system is arranged in the test area, connected with the infrared whole vehicle separator, and used for starting and recognizing the license plate number of the vehicle according to the starting signal and stopping recognition according to the ending signal.
8. The vehicle dynamic weighing apparatus of claim 1, further comprising:
the vehicle type recognition system is arranged in the test area, connected with the infrared whole vehicle separator, and used for starting and recognizing the vehicle type of the vehicle according to the start signal and stopping recognition according to the end signal.
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| CN110926572A (en) * | 2019-11-18 | 2020-03-27 | 武汉理工大学 | Vehicle overload monitoring system and method based on fiber bragg grating sensor |
| CN111521252B (en) * | 2020-04-02 | 2022-02-08 | 河南省计量科学研究院 | Remote metering verification method for dynamic truck scale |
| CN111521248B (en) * | 2020-05-09 | 2021-07-06 | 珠海任驰光电科技有限公司 | Fiber grating vehicle dynamic weighing sensor, device and method |
| CN113739891B (en) * | 2021-08-30 | 2024-01-26 | 西北铁道电子股份有限公司 | Sensor assembly for dynamic weighing of train and weighing method |
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