Noncontact deflection measurements in structures using diffraction gratings

Peter L. Fuhr; Dryver R. Huston; Adam J. McPadden

Noncontact deflection measurements in structures using diffraction gratings

Peter L. Fuhr, Dryver R. Huston, Adam J. McPadden

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › peer-review

Abstract

An optical technique has been developed whereby two angles and linear displacement can be simultaneously measured in a non-contact manner. The method depends upon the usage of a diffraction grating with linear variation of period along its length. The grating is attached to a structure at a point of interest while all other system components are placed at a remote location. Evaluation of this measurement technique has been demonstrated on a laboratory-based structure which simulated conditions found at deep trench (or tunnel) walls or bracing systems. In a construction site configuration, this sensor allows the user to determine if the walls are undergoing structural deformation. In addition, the magnitude of deformation may be measured and alarm conditions may be monitored. Experimental results obtained using this technique are presented and compared with theory.

Original language	English
Title of host publication	Recent Developments in Deflection Evaluation of Concrete
Editors	Edward G. Nawy, Debrethann R. Cagley
Publisher	American Concrete Institute
Pages	113-125
Number of pages	13
ISBN (Electronic)	9780870316593
State	Published - Apr 1 1996
Externally published	Yes

Publication series

Name	American Concrete Institute, ACI Special Publication
Volume	SP-161
ISSN (Print)	0193-2527

Funding

The authors wish to thank the National Science Foundation for their partial support of this project under grant BCS-9024390.

Funders	Funder number
National Science Foundation	BCS-9024390

Keywords

Deflection
Deformation
Diffraction grating
Optical metrology

Cite this

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title = "Noncontact deflection measurements in structures using diffraction gratings",

abstract = "An optical technique has been developed whereby two angles and linear displacement can be simultaneously measured in a non-contact manner. The method depends upon the usage of a diffraction grating with linear variation of period along its length. The grating is attached to a structure at a point of interest while all other system components are placed at a remote location. Evaluation of this measurement technique has been demonstrated on a laboratory-based structure which simulated conditions found at deep trench (or tunnel) walls or bracing systems. In a construction site configuration, this sensor allows the user to determine if the walls are undergoing structural deformation. In addition, the magnitude of deformation may be measured and alarm conditions may be monitored. Experimental results obtained using this technique are presented and compared with theory.",

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Noncontact deflection measurements in structures using diffraction gratings. / Fuhr, Peter L.; Huston, Dryver R.; McPadden, Adam J.
Recent Developments in Deflection Evaluation of Concrete. ed. / Edward G. Nawy; Debrethann R. Cagley. American Concrete Institute, 1996. p. 113-125 (American Concrete Institute, ACI Special Publication; Vol. SP-161).

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › peer-review

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N2 - An optical technique has been developed whereby two angles and linear displacement can be simultaneously measured in a non-contact manner. The method depends upon the usage of a diffraction grating with linear variation of period along its length. The grating is attached to a structure at a point of interest while all other system components are placed at a remote location. Evaluation of this measurement technique has been demonstrated on a laboratory-based structure which simulated conditions found at deep trench (or tunnel) walls or bracing systems. In a construction site configuration, this sensor allows the user to determine if the walls are undergoing structural deformation. In addition, the magnitude of deformation may be measured and alarm conditions may be monitored. Experimental results obtained using this technique are presented and compared with theory.

AB - An optical technique has been developed whereby two angles and linear displacement can be simultaneously measured in a non-contact manner. The method depends upon the usage of a diffraction grating with linear variation of period along its length. The grating is attached to a structure at a point of interest while all other system components are placed at a remote location. Evaluation of this measurement technique has been demonstrated on a laboratory-based structure which simulated conditions found at deep trench (or tunnel) walls or bracing systems. In a construction site configuration, this sensor allows the user to determine if the walls are undergoing structural deformation. In addition, the magnitude of deformation may be measured and alarm conditions may be monitored. Experimental results obtained using this technique are presented and compared with theory.

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BT - Recent Developments in Deflection Evaluation of Concrete

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ER -

Noncontact deflection measurements in structures using diffraction gratings

Abstract

Publication series

Funding

Keywords

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