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The fiber grating Expressway dynamic weighing systems research

Author: JiaZuoQian
Tutor: LvGuoHui
School: Heilongjiang University
Course: Electronics and Communication Engineering
Keywords: FBG the Automobile Weighting Systems Lab-VIEW software Temperature Compensation
CLC: TH715.1
Type: Master's thesis
Year: 2008
Downloads: 102
Quote: 0
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Abstract

With the rapid development of Chinese economy, highway transportation has become one of the most important means of all transportations, and plays an important supporting role in building of the national economy. As the systems and methods of management are not perfect, overloading phenomenon occurs from time to time. And the damage of road caused by overloading can be found everywhere. The accident arising from the damage of road is also alarming. Therefore, it has important practical significance that the adopting of a new way of counting the fee is to curb overloading on the highway, according the weight.In this paper, based on detailed study of technology of on-line weighting on the highway, the automobile weighting systems mostly employ the traditional electrical signal. Its performance is poor in precision,sensitivity, durability, stability, repeatability, zero shift,and simple in function as well. Aiming at those disadvantages, a new system based on new-style FBG (Fiber Bragg Gratings) sensor demodulation devices researched by company independently was presented. In the system, the unit of FBG sensors is packaged by fiber reinforced polymer. So it has come true that making system of multi-channel on-line vehicle dynamic weighing.In this paper, operating principle of FBG sensors which is the corn of vehicle dynamic weighing system is analyzed theoretically. After classification the FBG sensors, it describes the theory of working of Strain/temperature fiber grating sensor. With the application of measurement of strain and temperature by FBG sensors, the problem of cross-sensitivity of FBG sensors is analyzed emphatically, and discusses the solution to the problem is discussed. Integrating temperature compensation and calibration channel into weighting system and minimizing the influence of temperature to the system.In this Paper, we present fiber grating traditional demodulation methods, analysis the advantages and disadvantages of different demodulation methods and gives a proper modulation method of vehicle dynamic weighing system. We can gather the data of weight by new-style FBG sensor demodulation devices and solve the problem that the weight cannot be tested when the car pasts fast with static FBG sensor demodulation devices. The system discussed in this paper uses high-speed sweep optical maser as the light source to sweep FBG sensor demodulation devices dynamically, its scanning speeds of up to 300Hz. Laser has higher output power and signal to noise ratio of the system, and can achieve the function of multi-channel weighing at the same time, it can reduce highway toll stations of the total cost of re-charging.According to the high-speed fiber grating demodulation data acquisition system features, we use the Lab-VIEW software platform for the preparation of the weighing data acquisition and processing software, realized the high-speed data acquisition of weight, weight and axle load measurement waveforms show the basic functions. It can copy real-time data into the hard drive for data backup. System can transmit data by the Internet and remote monitoring functions can also be achieved.The practice adoption of the test shows that the weighing system has a good high-speed response characteristics, It can be able to accurately measuring the speed of different vehicles under the axle load, and used to detect vehicle’s overload. And combination of precision reference grating temperature compensation system can make the difference in the four seasons, environment, EMI’s big occasions, be widely appli?

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CLC: > Industrial Technology > Machinery and Instrument Industry > Instruments, meters > Measuring instruments > Quality measuring instruments > Weight measuring instruments
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