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Ultrasonic Lateral Displacement Sensor for Health Monitoring in Seismically Isolated Buildings.

Matsuya I, Matsumoto F, Ihara I - Sensors (Basel) (2015)

Bottom Line: The transmitters are immobilized at a fixed point, whereas the receiver set-up is separately arranged on the opposite side.In order to improve measurement accuracy, a correction method that utilizes polynomial approximation is introduced.When five transmitters are arranged, their measurement range is easily extended up to ±60 mm with an accuracy of 0.7 mm.

View Article: PubMed Central - PubMed

Affiliation: Department of Mechanical Engineering, Nagaoka University of Technology, Kamitomioka 1603-1, Nagaoka 940-2188, Niigata, Japan. matsuya@mech.nagaokaut.ac.jp.

ABSTRACT
An ultrasonic lateral displacement sensor utilizing air-coupled ultrasound transducers is proposed. The normally-distributed far field of an ultrasound transducer in a lateral direction is taken advantage of for measuring lateral displacement. The measurement system is composed of several air-coupled ultrasound transducers as a receiver and several transmitters. The transmitters are immobilized at a fixed point, whereas the receiver set-up is separately arranged on the opposite side. In order to improve measurement accuracy, a correction method that utilizes polynomial approximation is introduced. The difference between the corrected lateral displacement and the reference displacement is estimated to be 0.2 mm at maximum for the two transmitters system. A good responsiveness is demonstrated by conducting a dynamic response experiment. When five transmitters are arranged, their measurement range is easily extended up to ±60 mm with an accuracy of 0.7 mm. In both cases, the fluctuations to the measurement ranges show less than 1%. These results indicate that the developed sensor system is useful for measuring relative lateral displacement of a seismically isolated building in the field of structural health monitoring.

No MeSH data available.


Related in: MedlinePlus

Experimental setup for measuring lateral displacement over a wide range.
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sensors-15-17000-f004: Experimental setup for measuring lateral displacement over a wide range.

Mentions: In SHM, real-time responsiveness is important for small displacements as mentioned above, but for larger displacements, recording the maximum displacement is essential. Therefore, the ability to extend for large lateral displacements should be shown. The measurement range of lateral displacement is easily extended utilizing several transmitters and a receiver. Figure 4 shows the experimental setup for measuring lateral displacement over a wide measurement range. Several transmitters are immobilized at a fixed point, side by side with a distance of 30 mm, whereas the receiver is separately arranged on the opposite side. The distance between the transmitters and receiver is arranged to be 60 mm. When the receiver is traveling along the x axis, the wider lateral displacement of the receiver is calculated during every section of every two transmitters. The accuracy of the lateral displacement over a wide measurement range is discussed.


Ultrasonic Lateral Displacement Sensor for Health Monitoring in Seismically Isolated Buildings.

Matsuya I, Matsumoto F, Ihara I - Sensors (Basel) (2015)

Experimental setup for measuring lateral displacement over a wide range.
© Copyright Policy
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4541918&req=5

sensors-15-17000-f004: Experimental setup for measuring lateral displacement over a wide range.
Mentions: In SHM, real-time responsiveness is important for small displacements as mentioned above, but for larger displacements, recording the maximum displacement is essential. Therefore, the ability to extend for large lateral displacements should be shown. The measurement range of lateral displacement is easily extended utilizing several transmitters and a receiver. Figure 4 shows the experimental setup for measuring lateral displacement over a wide measurement range. Several transmitters are immobilized at a fixed point, side by side with a distance of 30 mm, whereas the receiver is separately arranged on the opposite side. The distance between the transmitters and receiver is arranged to be 60 mm. When the receiver is traveling along the x axis, the wider lateral displacement of the receiver is calculated during every section of every two transmitters. The accuracy of the lateral displacement over a wide measurement range is discussed.

Bottom Line: The transmitters are immobilized at a fixed point, whereas the receiver set-up is separately arranged on the opposite side.In order to improve measurement accuracy, a correction method that utilizes polynomial approximation is introduced.When five transmitters are arranged, their measurement range is easily extended up to ±60 mm with an accuracy of 0.7 mm.

View Article: PubMed Central - PubMed

Affiliation: Department of Mechanical Engineering, Nagaoka University of Technology, Kamitomioka 1603-1, Nagaoka 940-2188, Niigata, Japan. matsuya@mech.nagaokaut.ac.jp.

ABSTRACT
An ultrasonic lateral displacement sensor utilizing air-coupled ultrasound transducers is proposed. The normally-distributed far field of an ultrasound transducer in a lateral direction is taken advantage of for measuring lateral displacement. The measurement system is composed of several air-coupled ultrasound transducers as a receiver and several transmitters. The transmitters are immobilized at a fixed point, whereas the receiver set-up is separately arranged on the opposite side. In order to improve measurement accuracy, a correction method that utilizes polynomial approximation is introduced. The difference between the corrected lateral displacement and the reference displacement is estimated to be 0.2 mm at maximum for the two transmitters system. A good responsiveness is demonstrated by conducting a dynamic response experiment. When five transmitters are arranged, their measurement range is easily extended up to ±60 mm with an accuracy of 0.7 mm. In both cases, the fluctuations to the measurement ranges show less than 1%. These results indicate that the developed sensor system is useful for measuring relative lateral displacement of a seismically isolated building in the field of structural health monitoring.

No MeSH data available.


Related in: MedlinePlus