外文翻译--WIM系统中以光纤为基础的动态压力传感装置（中英文）

1、附件 外文翻译Optic fiber-based dynamic pressure sensor for WIM system Shenfang Yuana, , , Fahard Ansarib, Xiaohui Liua and Yang ZhaobaThe Aeronautical Key Laboratory for Smart Materials and Structures, Nanjing University of Aeronautics and Astronautics, 29 YuDao Street, Nanjing 210016, ChinabDepartment of Civil and Materials Engineering, University of Illinois at Chicago, Illinois, IL 60607, USAReceived 16 August 2004; accepted 10 November 2004. Available online 15 December 2004. AbstractAn optic fibe

2、r-based dynamic pressure sensor is described here to measure weight-in-motion of vehicles. In the research reported herein, a Michelson interferometer with specially designed hardware and software were developed and experimentally subjected to dynamic compressive loads of different magnitudes, and loading rates. Experiments showed that both output fringe number and fringe period could be used to indicate the dynamic load. A calibration technique has been put forward to calibrate the sensor. Both

3、 the dynamic weight and static weight of the vehicle passed can be obtained. The findings that resulted from these studies developed an understanding for the behavior of interferometer sensor under dynamic compressive states of stress and are fundamental to the application of fiber optic sensors for the monitoring of truck vehicle weights while in motion.Keywords: Optic fiber sensor; Dynamic pressure; Weight-in-motion; Hardware and softwareArticle Outline1. Introduction 2. The sensor design 2.1.

4、 Sensor setup 2.2. Sensor principle3. Experimental procedures and results 3.1. Experimental setup 3.2. Experimental data 3.3. Repeatability of the sensor 3.4. Calibration of the sensor 3.4.1. Calibration of the static weight 3.4.2. Calibration of the dynamic weight4. Conclusion References Vitae1. IntroductionThe need to weigh vehicles in motion, applied especially to traffic control, has grown substantially in the past decades. Several techniques for weighting vehicles in-motion are now used inc

5、luding piezoelectric cables, capacitive mats, hydraulic and bending-plate load cells 1. Hydraulic and bending-plate load cells offer high accuracy (15%) and dynamic range, yet suffer from high installation costs and size constraints. The piezoelectric and capacitive mat techniques are substantially lower in cost, yet are less accurate (515%) and do not function properly at speeds lower than 20km/h 2 and 3. To offer the required accuracy at reduced installation and maintenance costs, optic fiber-

6、based WIM sensors are now being developed to improve, complement or even replace the ones currently in use.Based on the effect of polarization coupling between two orthogonally polarized eigenmodes of polarization-maintaining fiber, Ansari et al. report on using highly birefringence polarization-maintaining (HiBi) fiber for dynamic measurement of pressure with practical ramifications to the determination of weigh-in-motion of trucks 3. Navarrete and Bernabeu report a multiple fiber-optic interfe

7、rometer consisting of a Mach-Zehnder interferometer configuration with one of its arms replaced by another Mach-Zehnder interferometer 4. Cosentino and Grossman developed a dynamic sensor using the microbend theory to test weight-in-motion 5.The present work describes the development of a dynamic pressure sensor based on the Michelson interferometer, which has simple structure, is cost effective and can potentially offer the high accuracy required for many applications. Special hardware and syst

8、em software based on Labview WINDOWS/CVI are designed to implement the sensor functions, such as eliminating environmental noise, self-triggering of the test procedure and the fringe number and fringe period simultaneous count. Responses of the dynamic sensor are studied when subjected to dynamic compressive loads with different magnitudes and loading rates. Data calibration method is also researched to calibrate the sensor.2. The sensor design2.1. Sensor setupFig. 1 illustrates schematically th

9、e proposed dynamic pressure sensor system. Single-mode optical fiber is used as a sensing element to form a Michelson interferometer. The optoelectronics components of the interferometer consist of a laser operating at wavelength of 1550nm, a laser isolator and a photodiode. The sensor is made of communication grade optical fiber (Corning SMF28). The output signal from the detector-amplifier is first fed to a special hardware circuits including a two-order high pass filter, a zero-point detection circuit and a Schmitt Trigger circuit. The hardware circuits are designed to implement the following functions: (1) self-diagnose the arrival time of the vehicle to self-trigger the measurement process; (2) provide function to eliminate the low frequency disturbances, such as temperature influences and slow changes of the elements performances; (3) provide function to reduce the noise to a frequency band sim

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