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US 7,411,176 B2Granted
Method and apparatus for examining corrosion of tendon embedded in concrete
AssigneeNational Central University
InventorsChung-Yue Wang, Peng-Ching Peng
Life of this patent
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Abstract
The present invention measures the strain caused by the shrink and expansion from the corrosion and examines the corrosion of a tendon for a long term with high sensitivity to improve the accuracy of the examination.
Claims24
An apparatus for examining corrosion of a tendon embedded in concrete, comprising:
- a tendon comprising a plurality of twisted pairs of steel wire strands while having a gap between every two neighboring steel wire strands;
- at least a sensor deposed in said gap respectively and connected to a coupler;
- a laser connected with said coupler, by which a light signal is transmitted through said coupler to said sensor;
- and
- an analyzer connected with said coupler, into which said light signal is received to be measured and analyzed after said light signal is returned from passing through said sensor.
2 more elements
A method for examining corrosion of a tendon embedded in concrete, comprising:
- step a:
- obtaining at least a sensor to be connected to a coupler, and deposing said sensor respectively in a gap between every two neighboring steel wire strands of said tendon;
- and
- step b:
- connecting a laser and an analyzer to said coupler,
- wherein a light signal is transmitted by said laser to said sensor through said coupler,
- wherein said light signal is returned to said analyzer through said sensor, and
- wherein a wavelength drift of said light signal is detected by said analyzer to obtain a strain of said tendon caused by shrink and expansion of said tendon.
5 more elements
Dependencies are inferred from the claim text.