CN209820605U - Dynamic weighing device for automobile - Google Patents
Dynamic weighing device for automobile Download PDFInfo
- Publication number
- CN209820605U CN209820605U CN201920832216.2U CN201920832216U CN209820605U CN 209820605 U CN209820605 U CN 209820605U CN 201920832216 U CN201920832216 U CN 201920832216U CN 209820605 U CN209820605 U CN 209820605U
- Authority
- CN
- China
- Prior art keywords
- automobile
- optical signal
- signal
- test area
- temperature
- 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
Landscapes
- Length Measuring Devices By Optical Means (AREA)
Abstract
The utility model discloses a car dynamic weighing device, include: a weighing platform; a broadband light source; the fiber bragg grating strain sensor is used for sensing the deformation of the weighing platform after receiving the optical signal to obtain a deformed optical signal; 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 axis of the automobile; the infrared finished automobile separator is used for tracking and confirming the whole process from the automobile entering the test area to the automobile leaving the test area, sending a starting signal when the automobile enters the test area, and sending an ending signal when the automobile leaves 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 utility model discloses a car dynamic weighing device can improve the precision of weighing.
Description
Technical Field
The utility model relates to an automobile weighing technical field especially relates to an automobile dynamic weighing device.
Background
At present, the highway truck scale dynamic weighing is carried out domestically, various truck scales such as a resistance strain gauge type, a piezoelectric type and a capacitance type are generally applied, but the highway truck scale dynamic weighing has the defects of large measurement precision error, frequent debugging and calibration, large volume and weight, requirement of professional installation and maintenance, poor environmental adaptability, easiness in interference of electromagnetism, temperature, humidity and impact force and the like.
In recent years, certain development and achievement are achieved for weighing detection technology, especially 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 scale body, a data acquisition control device, and functional detection components, where the functional detection components include an infrared alignment tube for vehicle separation detection, a hall sensor device for detecting vehicle speed, wheel base, and number of tires, a weight sensor for detecting weight, and a signal line connected to the data acquisition control device. The device of the truck scale requires that front and rear wheel shafts of a tested vehicle pass through a weighing platform at a constant speed once during testing, and the total weight of the vehicle is obtained by accumulating the data of the wheel shafts obtained by a weighing sensor arranged below the weighing platform. The strict constant speed does not exist in the actual test, so that certain errors can be generated in the test. Chinese patent CN200810163397.0 proposes a weighing channel, a weighing platform and a data acquisition and processing device arranged on the weighing channel, and further includes a wheel axle identifier and an image collector, etc., which can analyze and calculate the running speed and acceleration of the vehicle, so as to correct the weighing result and improve the precision. However, the two weighing devices adopt the traditional weighing sensors and are limited by factors such as position, time and the like, so the two weighing devices have the problems of low sensitivity and large zero drift, and have the defects of large nonlinearity, low precision, poor electromagnetic interference resistance, poor corrosion resistance and the like in a large strain state. To the traditional electric strain sensor, chinese patent CN200510010507.6 proposes a weighing detection device based on fiber bragg grating sensor, which comprises 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 comprises a bearing plate, a buffer layer, a bracket and a foundation, two brackets are fixed on the foundation, two ends of the bearing plate are fixed on the brackets, the buffer layer is located between the bearing plate and the foundation, and at least three sensors are symmetrically arranged on the bearing plate of the weighing bearing device. The automobile weighing detection by utilizing the fiber 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, the fiber grating sensor needs to be arranged on a bearing device with a multi-layer structure for weighing, the structure is complex, the installation is complex, the testing time is short, the influence of different temperatures on the mechanical property of the bearing device is not considered, that is, the indirect influence of temperature on the weighing precision is not considered, because the fiber grating sensor is divided into a strain sensor and a temperature sensor, the fiber grating wavelength of the strain sensor is sensitive to the temperature and the strain simultaneously, that is, the temperature and the strain simultaneously cause the coupling wavelength of the fiber bragg grating to move, so that the temperature and the strain can not be distinguished by measuring the coupling wavelength of the fiber bragg grating, the temperature sensor can only measure the change of the temperature in the environment and is not influenced by the change of the strain, if the system is only provided with a strain sensor, the temperature variable cannot be independently monitored, so the technology has the defects of low weighing precision and the like.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a car dynamic weighing device can improve the precision of weighing.
In order to achieve the above object, the utility model provides a following scheme:
a dynamic weighing apparatus for a vehicle, comprising:
the weighing platform is arranged on the road surface of the test area and used for bearing the 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, is connected with the broadband light source and is used for sensing the deformation of the weighing platform after receiving the optical signal to obtain a deformed optical signal;
the fiber bragg grating temperature sensor is arranged on the weighing platform, is connected with the broadband light source and 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 respectively connected with the fiber bragg grating strain sensor and the fiber bragg grating temperature sensor and is used for filtering the temperature optical signal doped in the deformation optical signal and demodulating the filtered deformation optical signal to obtain the weight of each axis of the automobile;
the infrared finished automobile separator is arranged in the test area and used for tracking and confirming the whole process from the time when the automobile enters the test area to the time when the automobile leaves the test area, sending a starting signal when the automobile enters the test area and sending an ending signal when the automobile leaves the test area;
and the controller is respectively connected with the infrared finished automobile separator and the fiber bragg grating sensing demodulation system and is used for receiving the weight of each shaft of the same automobile in a test area to obtain the weight of the automobile.
Optionally, the controller includes:
the control chip is connected with the infrared finished automobile separator and used for sending an adding instruction according to the starting signal and sending a stopping adding instruction according to the ending signal;
and the adder is respectively connected with the control chip and the fiber bragg grating sensing and demodulating 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 a vehicle further comprises:
the trigger sensor is arranged in the test area, connected with the broadband light source and used for sending a starting signal to the broadband light source when an automobile enters the test area, and the broadband light source generates the optical signal according to the starting signal.
Optionally, the dynamic weighing device for a vehicle 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 optical fiber coupler is used for shunting the optical signal to the fiber grating strain sensor and the fiber grating temperature sensor and combining the deformation optical signal and the temperature optical signal to the optical splitter, and the optical splitter divides the combined deformation optical signal and temperature optical signal into a deformation optical signal and a temperature optical signal and then sends the deformation optical signal and the temperature optical signal to the fiber grating sensing demodulation system.
Optionally, the dynamic weighing device for a vehicle 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 signal and temperature optical signal into electric signals and transmitting the electric signals to the optical splitter.
Optionally, the dynamic weighing device for a vehicle further comprises:
and the tire identifier is arranged in the test area, is connected with the infrared finished automobile separator, and is used for starting to identify whether the automobile tire is single or double according to the starting signal and stopping identification according to the ending signal.
Optionally, the dynamic weighing device for a vehicle further comprises:
and the license plate recognition system is arranged in the test area, is connected with the infrared whole vehicle separator, and is used for starting to recognize 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 a vehicle further comprises:
and the vehicle type recognition system is arranged in the test area, is connected with the infrared finished vehicle separator, and is used for starting to recognize the vehicle type of the vehicle according to the starting signal and stopping recognizing according to the ending signal.
Optionally, the weighing platform is a layer of uniform-strength beam.
Optionally, the number of the fiber grating strain sensors and the number of the fiber grating temperature sensors both include 4, and each of the fiber grating strain sensors and each of the fiber grating temperature sensors are respectively disposed at four corners of the weighing platform.
According to the utility model provides a concrete embodiment, the utility model discloses a following technological effect: the utility model discloses a car dynamic weighing device sets up fiber grating strain sensor and fiber grating temperature sensor on the platform of weighing, deformation that arouses through fiber grating strain sensor monitoring car weight obtains deformation light signal, the temperature variation that arouses through fiber grating temperature sensor monitoring ambient temperature obtains temperature light signal, through the temperature light signal of doping in the fiber grating sensing demodulation system filtering deformation light signal, thereby the deformation light signal after disturbing to the filtering temperature demodulates and obtains accurate car weight information. The utility model discloses a set up fiber grating temperature sensor, considered the temperature to bear the influence of device and weighing accuracy, compensated the change that the temperature arouses in final result to the weighing accuracy has been improved. Adopt the utility model discloses a car dynamic weighing device can carry out dynamic weighing to the car in real time, judges whether the car has the phenomenon of overloading.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without inventive labor.
FIG. 1 is a structural diagram of an embodiment of the dynamic weighing apparatus for a vehicle according to the present invention;
FIG. 2 is a structural diagram of a weighing platform in an embodiment of the dynamic weighing apparatus for an automobile of the present invention;
FIG. 3 is a schematic view of axle group recognition in an embodiment of the dynamic weighing apparatus for an automobile of the present invention;
FIG. 4 is a diagram of a fiber grating structure in an embodiment of the dynamic weighing apparatus for a vehicle of the present invention;
FIG. 5 is a schematic view of the fiber grating in a normal state in an embodiment of the dynamic weighing apparatus for a vehicle according to the present invention;
FIG. 6 is a schematic view of the fiber grating in the embodiment of the dynamic weighing apparatus for automobile of the present invention under the pulling/pressing state;
FIG. 7 is a waveform diagram of the incident light of the fiber grating in the pulling/pressing state in the embodiment of the dynamic weighing apparatus for automobile of the present invention;
FIG. 8 is a waveform diagram of the reflected light of the fiber grating under the pulling/pressing state in the embodiment of the dynamic weighing apparatus for automobile of the present invention;
fig. 9 is a waveform diagram of the transmission light of the fiber grating in the pulling/pressing state in the embodiment of the dynamic weighing apparatus for automobile of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
The utility model aims at providing a car dynamic weighing device can improve the precision of weighing.
In order to make the above objects, features and advantages of the present invention more comprehensible, the present invention is described in detail with reference to the accompanying drawings and the detailed description.
Fig. 1 is a structural diagram of an embodiment of the dynamic weighing device for an automobile of the present invention. Referring to fig. 1, the dynamic weighing device for the automobile comprises a weighing platform 101, a broadband light source 102, a fiber grating strain sensor 103, a fiber grating temperature sensor 104, a fiber grating sensing and demodulating system 105, an infrared whole automobile separator 106 and a controller 107.
The weighing platform 101 is arranged on a road surface of a test area and 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 arranged on the weighing platform 101, connected with the broadband light source 102, and used for sensing deformation of the weighing platform 101 after receiving the optical signal to obtain a deformed optical signal.
The fiber bragg grating temperature sensor 104 is arranged on the weighing platform 101, connected with the broadband light source 102, and configured to sense an ambient temperature of the weighing platform 101 after receiving the optical signal, so as to obtain a temperature optical signal.
The fiber grating sensing demodulation system 105 is respectively connected with the fiber grating strain sensor 103 and the fiber grating temperature sensor 104, and is configured to filter the temperature optical signal doped in the deformation optical signal, and demodulate the filtered deformation optical signal to obtain the weight of each axle of the automobile.
The infrared finished automobile separator 106 is arranged in the test area and used for tracking and confirming the whole process from the time when the automobile enters the test area to the time when the automobile leaves the test area, sending a starting signal when the automobile enters the test area, and sending an ending signal when the automobile leaves the test area.
The whole infrared vehicle separator 106 can track and confirm the whole process of a test vehicle from entering a detection area to leaving the detection area, and can transmit signals to the controller when the vehicle enters the detection area and leaves the detection area, because the strain sensor tests strain information, but can not judge which strain information is a vehicle, and can judge which strain information is a vehicle through the information of the infrared separator, and then the weight strain information of the vehicle is summarized to be the weight of the whole vehicle.
The controller 107 is respectively connected with the infrared finished automobile separator 106 and the fiber bragg grating sensing and demodulating system 105, and is used for receiving the weight of each shaft of the same automobile in a test area to obtain the weight of the automobile.
In this embodiment, the controller 107 is wirelessly connected to the infrared full car splitter 106.
The controller 107 includes a control chip and an adder.
The control chip is connected with the infrared finished automobile separator 106 and used for sending an adding instruction according to the starting signal and sending a stopping adding instruction according to the ending signal.
The adder is respectively connected with the control chip and the fiber bragg grating sensing and demodulating system 105 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 stopping adding instruction.
The automobile dynamic weighing device further comprises a trigger sensor 108, an optical fiber coupler 109, a light splitter 110, a light detector 111, a tire recognizer 112, a license plate recognition system 113 and a vehicle type recognition system 114.
The trigger sensor 108 is disposed in the test area, connected to the broadband light source 102, and configured to send a start signal to the broadband light source 102 when the automobile enters the test area, where the broadband light source 102 generates the optical signal according to the start signal.
In this embodiment, the trigger sensor 108 is wirelessly connected to the controller 107, the controller is connected to the broadband light source 102, and the controller 107 controls the broadband light source to generate the optical signal.
The optical fiber coupler 109 and the optical splitter 110 are connected to each other, the optical fiber coupler 109 is further connected to the broadband light source 102, the fiber grating strain sensor 103 and the fiber grating temperature sensor 104, the optical splitter 110 is further connected to the fiber grating sensing demodulation system 105, the optical fiber coupler 109 is configured to split the optical signal to the fiber grating strain sensor 103 and the fiber grating temperature sensor 104, and combine the deformation optical signal and the temperature optical signal to the optical splitter 110, and the optical splitter 110 divides the combined deformation optical signal and temperature optical signal into a deformation optical signal and a temperature optical signal and then sends the deformation optical signal and the temperature optical signal to the fiber grating sensing demodulation system 105.
The optical detector 111 is respectively connected to the optical fiber coupler 109 and the optical splitter 110, and is configured to convert the combined deformation optical signal and temperature optical signal into electrical signals and transmit the electrical signals to the optical splitter.
The tire identifier 112 is arranged in a test area, connected with the infrared finished automobile separator 106, and used for starting to identify whether an automobile tire is single or double according to the starting signal and stopping identification according to the ending signal.
In this embodiment, the tire identifier 112 is provided with only 20 (each spaced by 10cm) pressure-sensitive sensors on the road surface on the center line side of the tunnel, and the number of the tire-ground contact portions can be detected by the pressure-sensitive sensors when the vehicle passes, and data l is generated when the wheel is pressed against the pressure-sensitive sensors, and data 0 is generated otherwise. The data is read by a single chip connected to the pressure-sensitive sensor, and when the data continues to be l, a tire is identified. For example: the data of the double tires is 001101100000, and the data of the single tire is 001100000000, and the type of the automobile can be judged by detecting the number of the tires.
The tire recognizer is used for recognizing whether the vehicle is a single tire or a double tire, the data processing center compares, analyzes and determines the type of the vehicle, calculates the number of axles, the distance between the axles, the speed, the acceleration and the like of the vehicle, comprehensively utilizes the function of the infrared whole vehicle separator to track and confirm the whole process from the entering of the detected vehicle into the detection area to the leaving of the detection area, timely transmits and sends interrupt signal passing information to the controller when the detected vehicle enters the detection area and leaves the detection area, enables the controller to automatically judge according to the signal sent by the infrared whole vehicle separator, and sums and weights the total weight of the detected vehicle according to the passing information.
Wherein, the speed of a motor vehicle detects by tire recognizer and weighing platform's distance d fixed, and both are apart from generally being less than 1m, can regard as the car to pass through at the uniform velocity, consequently through the time t of car through tire recognizer and weighing platform alright detect the speed of a motor vehicle: and v is d/t.
And the detection of the axle group judges a single axle, a double axle or a triple axle according to the vehicle speed v and the adjacent signal time t of the tire identifier. For example, referring to FIG. 3, as each axle passes the tire identifier, the time difference between each pair is t1、t2、t3Can obtain d1＝v*t1、d2＝v*t2、d3＝v*t3If the distance d is larger than the set value, A, B is determined to be single-axis, C, D is determined to be double-axis.
The license plate recognition system 113 is arranged in a test area, is connected with the infrared whole vehicle separator 106, and is used for starting to recognize the license plate number of the vehicle according to the starting signal and stopping recognition according to the ending signal.
In this embodiment, the license plate recognition system 113 adopts a mature license plate recognition system, and when the vehicle passes through the weighing platform 101, the license plate recognition device in the video monitoring system can be started, and the image acquisition module acquires the image data of the license plate, and the license plate number is obtained through the image algorithm processing.
The vehicle type recognition system 114 is arranged in a test area, connected with the infrared finished vehicle separator 106, and used for starting recognition of the vehicle type of the vehicle according to the start signal and stopping recognition according to the end signal.
In this embodiment, 4 identical test areas are provided, each test area including 1 weighing platform, 4 fiber grating strain sensors 103, 4 fiber grating temperature sensors 104, one tire identifier 112, 2 trigger sensors 108, and 1 infrared full car splitter 106.
In this embodiment, the fiber grating strain sensor 103 and the fiber 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.
The utility model discloses a car dynamic weighing device, when the car passes through the test area territory and triggers the sensor, can produce an interrupt signal, according to this interrupt signal, weighing device send instruction control fiber grating strain transducer and fiber grating temperature sensor begin to prepare to weigh to begin to gather the light wave signal of fiber grating sensor output, turn into information such as measured weight, speed, temperature. The optical signal change 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 a tire identifier, and the optical signal acquired by the temperature sensor can be directly converted into the temperature through a formula and sent to a data processing center according to an agreed communication protocol.
The tire recognizer detects the type of the vehicle according to the characteristics of the vehicle axle, license plate numbers are obtained through license plate recognition equipment, and data such as vehicle type classification, license plate numbers and the like are transmitted to the monitoring analysis processing unit through the serial communication interface.
When the vehicle passes through the platform of weighing, the every axle weight of vehicle can be acted on the platform of weighing through both sides tire, strain sensor output and the light signal of weight proportion, when the vehicle pressure is on the platform of weighing, the platform of weighing takes place deformation, the strain sensor who installs on the platform of weighing also receives pressure simultaneously and deforms, demodulation equipment one end sends light signal, light signal transmits the sensor through the link, and reflect in the sensor, because the sensor takes place deformation, the center wavelength that reflects can change, demodulation equipment is through the change volume that detects reflection center wavelength, reachs corresponding light signal's change volume, and pass through the optic fibre transmission with every axle weight and give the controller.
The fiber grating sensing demodulation system is a high-speed demodulation device which integrates a wavelength demodulation algorithm and a physical quantity conversion algorithm and can demodulate optical signals with wavelength offset into measured related physical quantities such as weight, speed, acceleration, temperature and the like in real time.
The fiber grating sensing demodulation system can not only collect the weighed optical signal variable quantity (variable quantity of the wavelength of the grating reflection center) in real time and demodulate the measured quantity, but also effectively reduce or even eliminate the influence of temperature and vehicle running speed on the measurement of other parameters, and the demodulated information can be transmitted to a data processing center in real time through a communication subsystem to realize remote control and management; in turn, the data processing center can configure various parameters of the demodulating device according to actual requirements, so that the automobile dynamic weighing device is more flexible and effective. And the data processing center calculates whether the vehicle is overloaded and the specific number of the overloaded vehicle 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 which can receive information demodulated by the demodulating device in real time, synthesize multiple factors according to a neural network algorithm, correct weight information directly detected by the demodulating device, finally generate monitoring reports of vehicle types, license plate numbers, total vehicle loads, overload quantity, speed and the like and display the monitoring reports on a client terminal, after an automobile passes through a test area, the demodulating device collects optical signal quantity changed by a sensor, the data is only optical data, the optical data has a direct linear relation with the weight, and the optical data is directly converted into the weight information through the neural network algorithm. The software system of the data processing center is simple to operate, and a worker can quickly master the usage of the software system, so that whether the measured value is in a normal range or not can be accurately detected and monitored, and the field worker can be conveniently guided to take corresponding measures.
Fig. 2 is the structure diagram of the weighing platform in the embodiment of the dynamic weighing device for automobile of the utility model. Referring to fig. 2, the weighing platform 101 is a layer of uniform-strength beam, and the weighing platform 101 is optimized compared with a multilayer bearing structure, so that the weighing platform is simpler to mount.
The fiber bragg grating strain sensors 103 and the fiber bragg grating temperature sensors 104 respectively comprise 4 fiber bragg grating strain sensors 103, and the fiber bragg grating strain sensors 103 and the fiber bragg grating temperature sensors 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 which are respectively arranged at four corners of the weighing platform 101, adjacent fiber bragg grating sensors are connected end to end through optical fibers and are finally connected in series, the sensors are arranged on a sensing beam, the sensing beam is an equal-strength beam, the maximum positive stress on each cross section area of the beam is equal and reaches the allowable stress of materials, and the structural design can save materials and improve the bearing capacity of the structure. Therefore, after an 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 axial strain 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 loaded goods, the borne weight is transmitted to the fiber grating strain sensor, the strain sensor monitors the strain change caused by the weight, and the weighing system is simple in structure, convenient to install and quite stable in working state.
Fig. 4 is a structure diagram of the fiber grating in the embodiment of the dynamic weighing apparatus for automobile of the present invention. Referring to fig. 4, a fiber grating is a fiber with a certain length (typically only 10mm), and the fiber has a periodically changing refractive index in the core 401 or the cladding 402, so as to reflect light that satisfies the bragg condition (λ ═ 2neff Λ, where neff is the effective refractive index of the grating and Λ is the grating period). When a broad spectrum, such as the incident spectrum 403 of fig. 4, passes through the fiber bragg grating, a monochromatic light is reflected back by the grating, such as the reflected spectrum 404 of fig. 4. 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.
The fiber bragg grating is a general term in physics, the principle of the internal grating of each fiber bragg grating sensor is the same, but different sensor processes, packaging, sizes, sensitivities, materials and the like are different. The fiber Bragg grating is the most common fiber grating and is a narrowband reflection filtering passive device with excellent performance. When the Bragg grating is subjected to external stress (strain), the grating period can be changed, and meanwhile, the effective refractive index of the grating can be changed due to the photoelastic effect; when the Bragg grating is affected by external temperature, the grating period can be changed by the expansion with heat and contraction with cold effects, meanwhile, the effective refractive index of the grating can be changed by the thermosensitive effect, and the sensor based on the fiber Bragg grating principle basically changes the central wavelength of the grating by directly or indirectly utilizing strain or temperature, so that the purpose of testing the measured physical quantity is achieved.
Fig. 5 and 6 are schematic diagrams of the fiber grating in a normal state and a pull/press state, respectively. In actual engineering, if a point to be detected is subjected to changes such as strain, temperature, pressure, displacement, acceleration and the like, the wavelength of reflected light changes, and fig. 7, 8 and 9 are respectively a waveform diagram of incident light, a waveform diagram of reflected light and a waveform diagram of transmitted light, so that the conditions such as stress of the point can be detected by detecting the change of the wavelength, and the safety condition of the detected position or physical quantity can be judged.
In practical application, the demodulation device can continuously emit wide spectrum to detect 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 changes of the reflected central wavelength.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
The principle and the implementation of the present invention are explained herein by using specific examples, and the above description of the embodiments is only used to help understand the system and the core idea of the present invention; meanwhile, for the general technical personnel in the field, according to the idea of the present invention, there are changes in the concrete implementation and the application scope. In summary, the content of the present specification should not be construed as a limitation of the present invention.
Claims (10)
1. A dynamic weighing apparatus for a vehicle, comprising:
the weighing platform is arranged on the road surface of the test area and used for bearing the 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, is connected with the broadband light source and is used for sensing the deformation of the weighing platform after receiving the optical signal to obtain a deformed optical signal;
the fiber bragg grating temperature sensor is arranged on the weighing platform, is connected with the broadband light source and 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 respectively connected with the fiber bragg grating strain sensor and the fiber bragg grating temperature sensor and is used for filtering the temperature optical signal doped in the deformation optical signal and demodulating the filtered deformation optical signal to obtain the weight of each axis of the automobile;
the infrared finished automobile separator is arranged in the test area and used for tracking and confirming the whole process from the time when the automobile enters the test area to the time when the automobile leaves the test area, sending a starting signal when the automobile enters the test area and sending an ending signal when the automobile leaves the test area;
and the controller is respectively connected with the infrared finished automobile separator and the fiber bragg grating sensing demodulation system and is used for receiving the weight of each shaft of the same automobile in a test area to obtain the weight of the automobile.
2. The automotive dynamic weighing apparatus of claim 1, wherein the controller comprises:
the control chip is connected with the infrared finished automobile separator and used for sending an adding instruction according to the starting signal and sending a stopping adding instruction according to the ending signal;
and the adder is respectively connected with the control chip and the fiber bragg grating sensing and demodulating 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 automotive dynamic weighing device of claim 1, further comprising:
the trigger sensor is arranged in the test area, connected with the broadband light source and used for sending a starting signal to the broadband light source when an automobile enters the test area, and the broadband light source generates the optical signal according to the starting signal.
4. The automotive dynamic weighing device 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 optical fiber coupler is used for shunting the optical signal to the fiber grating strain sensor and the fiber grating temperature sensor and combining the deformation optical signal and the temperature optical signal to the optical splitter, and the optical splitter divides the combined deformation optical signal and temperature optical signal into a deformation optical signal and a temperature optical signal and then sends the deformation optical signal and the temperature optical signal to the fiber grating sensing demodulation system.
5. The automotive dynamic weighing device 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 signal and temperature optical signal into electric signals and transmitting the electric signals to the optical splitter.
6. The automotive dynamic weighing device of claim 1, further comprising:
and the tire identifier is arranged in the test area, is connected with the infrared finished automobile separator, and is used for starting to identify whether the automobile tire is single or double according to the starting signal and stopping identification according to the ending signal.
7. The automotive dynamic weighing device of claim 1, further comprising:
and the license plate recognition system is arranged in the test area, is connected with the infrared whole vehicle separator, and is used for starting to recognize the license plate number of the vehicle according to the starting signal and stopping recognition according to the ending signal.
8. The automotive dynamic weighing device of claim 1, further comprising:
and the vehicle type recognition system is arranged in the test area, is connected with the infrared finished vehicle separator, and is used for starting to recognize the vehicle type of the vehicle according to the starting signal and stopping recognizing according to the ending signal.
9. The automotive dynamic weighing apparatus of claim 1, wherein the weighing platform is a layer of constant strength beam.
10. The dynamic weighing apparatus according to claim 1, wherein the number of the fiber grating strain sensors and the number of the fiber grating temperature sensors are 4, and each of the fiber grating strain sensors and each of the fiber grating temperature sensors are respectively disposed at four corners of the weighing platform.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920832216.2U CN209820605U (en) | 2019-06-04 | 2019-06-04 | Dynamic weighing device for automobile |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920832216.2U CN209820605U (en) | 2019-06-04 | 2019-06-04 | Dynamic weighing device for automobile |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209820605U true CN209820605U (en) | 2019-12-20 |
Family
ID=68884111
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920832216.2U Active CN209820605U (en) | 2019-06-04 | 2019-06-04 | Dynamic weighing device for automobile |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN209820605U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110108340A (en) * | 2019-06-04 | 2019-08-09 | 西北铁道电子股份有限公司 | A kind of automobile dynamically weighing device |
-
2019
- 2019-06-04 CN CN201920832216.2U patent/CN209820605U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110108340A (en) * | 2019-06-04 | 2019-08-09 | 西北铁道电子股份有限公司 | A kind of automobile dynamically weighing device |
| CN110108340B (en) * | 2019-06-04 | 2024-03-22 | 西北铁道电子股份有限公司 | Dynamic weighing device for automobile |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN110108340B (en) | Dynamic weighing device for automobile | |
| US10753827B2 (en) | Method and system for measuring vertical wheel impact force in real-time based on tire pressure monitoring | |
| CN203011351U (en) | Sheet deformation measuring device with FBG (Fiber Bragg Grating) sensors | |
| CN109595470B (en) | Distributed pipeline detection method | |
| CN107131938A (en) | A kind of vehicle dynamic weighing system and its monitoring method | |
| Bin et al. | Study of vehicle weight-in-motion system based on fiber-optic microbend sensor | |
| CN104390685A (en) | Portable optical fiber dynamic weighing system | |
| CN103033285A (en) | Simultaneous measurement method of temperature and strain of laid photoelectric composite cable | |
| Gubaidullin et al. | Microwave-photonic sensory tire control system based on FBG | |
| CN209820605U (en) | Dynamic weighing device for automobile | |
| CN1936520B (en) | Data processing method of optical-fiber sensing type railroad track scale | |
| CN202055155U (en) | Laser inertia high-speed pavement smoothness detection instrument | |
| CN212567631U (en) | Quartz dynamic vehicle weighing system capable of weighing at low speed | |
| CN100367324C (en) | Expressway dynamic weight and speed monitoring device | |
| CN214583662U (en) | Asphalt pavement compaction temperature detection system | |
| CN206847755U (en) | A kind of vehicle dynamic weighing system | |
| CN110926572A (en) | Vehicle overload monitoring system and method based on fiber bragg grating sensor | |
| CN102866031A (en) | Method for testing response relation of load position and bridge | |
| CN201974183U (en) | Sensor for crack detection of civil structure based on optical fiber long chirping grating frequency domain reflection technology | |
| CN102175170A (en) | Detecting method and sensor for cracks of civil structure based on optical fiber long chirped grating frequency domain reflection technology | |
| CN105527001B (en) | Vehicle dynamic measurement sensing device and method based on fiber annular cavity attenuation and vibration technique | |
| CN107631814A (en) | Light senses light channel structure, frequency displacement change detecting method and sensing device from relevant | |
| CN201037786Y (en) | Chirped optical fibre grating weighing sensor | |
| RU2308692C1 (en) | Method and device for monitoring bridge | |
| CN208520454U (en) | Bar shaped stress-type dynamic vehicle weighing device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |