Second-generation fiber grating traffic monitoring systems on the I-84 freeway

Kunzler, Marley; Udd, Eric; Taylor, Tad; Kunzler, Wesley

doi:10.1117/12.483693

Cited by 2 publications

(3 citation statements)

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“…FBG offers promising advantages, such as its anti-electromagnetic interference, favorable compatibility, high sensitivity and sampling frequency, and excellent durability, and has been proven suitable for traffic and pavement structural monitoring. [10][11][12][13][14] When the external loading applies impulse on an FBG, the Bragg wavelength shifts from its initial value as detected by a demodulator. However, the bare FBG comprises quartz, which is substantially similar to ordinary fragile glass.…”

Section: Introductionmentioning

confidence: 99%

Theoretical evaluation of the measurement accuracy of fiber Bragg grating strain sensors within randomly filled asphalt mixtures based on finite element simulation

Zhang

Gong

et al. 2017

Struct Control Health Monit

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SummaryStrain sensor is a crucial component in pavement response monitoring, and its measuring accuracy is vital to the evaluation and prediction of pavement performance.However, measurement variability and biases are unavoidable in nature due to the inherent granular characteristics of the asphalt mixture and the inclusion of the embedded strain sensor, respectively. In this study, a certain amount of 4-point bending beams, which were filled with random aggregates and asphalt mortar utilizing the finite element method, were constructed to represent the variability of the conventional dense asphalt mixture AC-13. Fiber Bragg grating sensor models of various lengths, anchor radii, and encapsulating moduli were then inserted into these bending beams to analyze the inclusion effect of the embedded strain sensor.The simulation results illustrated the diverse effects of the different geometries and moduli of embedded sensors on the stress and strain states of the asphalt mixture.From a purely theoretical perspective, a calibration equation was proposed between the theoretical value that represented the equivalent strain of the asphalt mixture and the measured value that was calculated from the sensor model. Multifactor variance analysis and multiple comparison procedure were applied to evaluate the measurement accuracy and to optimize the geometries and moduli of sensors. This research provides a basis for optimizing strain sensors employed in asphalt pavements and offers a novel insight toward the response measurement for granular materials. | INTRODUCTIONStructural health monitoring (SHM) is an interdisciplinary branch of engineering that was broadly expanded over the past two decades. SHM interprets the mechanisms between external loading and structural response, represents the evolutionary deterioration or unexpected collapse of full-scale civil infrastructures, and predicts the damage condition and service life of structures. [1,2] Specifically, our research focuses on the application of SHM technology in pavement engineering.Various instruments, including pressure cells, strain gauges, and temperature and moisture probes, are involved in monitoring pavement responses. These instruments are usually installed at the bottom of each pavement structural layer to measure the responses that are induced by traffic and environment loads. Several representative projects in pavement health

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Section: Introductionmentioning

confidence: 99%

Theoretical evaluation of the measurement accuracy of fiber Bragg grating strain sensors within randomly filled asphalt mixtures based on finite element simulation

Zhang

Gong

et al. 2017

Struct Control Health Monit

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“…An invasive method for monitoring selected road traffic parameters which included detecting vehicles and vehicle speed and weight was conducted on the I-84 highway in Portland using five FBG (fiber Bragg grating) sensors installed into the asphalt pavement at a depth of 7 cm [25,26]. Insufficient protection of the FBG sensors resulted in damage to the sensors.…”

Section: Fiber Optic and Optical Sensorsmentioning

confidence: 99%

“…In the Introduction, we summarize the current approaches to using fiber Bragg grating sensors for road traffic monitoring. Against the presented research [25][26][27][28][29], where an invasive installation of sensors into the road is necessary, we focused on the design of a portable sensor that can be installed non-invasively on the road at any place for any time with a focus on urban car traffic.…”

Section: Design and Realization Of Portable Fbg Sensormentioning

confidence: 99%

Portable Optical Fiber Bragg Grating Sensor for Monitoring Traffic Density

et al. 2019

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The paper examines the development of a portable sensor strip with fiber optic Bragg grating for monitoring urban traffic density up to 80 kph. It contains a 2.5-m-long and a 2-cm-high sensor created from a combination of silicone addition rubber (bicomponent addition silicone rubber) and Bragg grating placed inside a carbon tube. The design of the portable sensor permits traffic density and cars crossings to be monitored and detected in a single lane. The functionality of the sensor was verified in real traffic; the results of this study are based on the detection of 1518 vehicles of different types and sizes. According to the measurements, the sensor is characterized by a high detection rate of 98.946%.

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Second-generation fiber grating traffic monitoring systems on the I-84 freeway

Cited by 2 publications

References 0 publications

Theoretical evaluation of the measurement accuracy of fiber Bragg grating strain sensors within randomly filled asphalt mixtures based on finite element simulation

Theoretical evaluation of the measurement accuracy of fiber Bragg grating strain sensors within randomly filled asphalt mixtures based on finite element simulation

Portable Optical Fiber Bragg Grating Sensor for Monitoring Traffic Density

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