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Smart Structures and Systems
  Volume 21, Number 5, May 2018 , pages 637-652

Comparative study on displacement measurement sensors for high-speed railroad bridge
Soojin Cho, Junhwa Lee and Sung-Han Sim

    This paper presents a comparative study of displacement measurement using four sensors that are being used in the field: they are a ring gauge, a laser Doppler vibrometer (LDV), a vision-based displacement measurement system (VDMS), and an optoelectronic displacement meter (ODM). The comparative study was carried out on a brand-new high-speed railroad bridge designed to produce displacements within a couple of millimeters under the loading of a high-speed train. The tests were carried out on a single-span steel plate girder bridge two times with different train loadings: KTX and HEMU. The measured displacement is compared as raw and further discussion was made on the measurement noise, peak displacement, and frequency response of four sensors. The comparisonsare summarized to show the pros and cons of the used sensors in measuring displacement at a typical high-speed railroad bridge.
Key Words
    displacement; railroad bridge; ring gauge; laser Doppler vibrometer; vision system; optoelectronic displacement meter
Soojin Cho: Department of Civil Engineering, University of Seoul, Seoul 02504, South Korea
Junhwa Lee and Sung-Han Sim: School of Urban and Environmental Engineering, Ulsan National Institute of Science and Technology, Ulsan 44919, South Korea

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