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http://dx.doi.org/10.3807/JOSK.2016.20.6.770

Methods and Systems for High-temperature Strain Measurement of the Main Steam Pipe of a Boiler of a Power Plant While in Service  

Guang, Chen (Beijing Jiaotong University)
Qibo, Feng (Beijing Jiaotong University)
Keqin, Ding (China Special Equipment Inspection and Research Institute)
Publication Information
Journal of the Optical Society of Korea / v.20, no.6, 2016 , pp. 770-777 More about this Journal
Abstract
It has been a challenge for researchers to accurately measure high temperature creep strain online without damaging the mechanical properties of the pipe surface. To this end, a noncontact method for measuring high temperature strain of a main steam pipe based on digital image correlation was proposed, and a system for monitoring of high temperature strain was designed and developed. Wavelet thresholding was used for denoising measurement data. The sub-pixel displacement search algorithm with curved surface fitting was improved to increase measurement accuracy. A field test was carried out to investigate the designed monitoring system of high temperature strain. The measuring error was less than $0.4ppm/^{\circ}C$, which meets actual measurement requirements for engineering. Our findings provide a new way to monitor creep damage of the main steam pipe of a boiler of an ultra-supercritical power plant in service.
Keywords
Digital image correlation; Main steam pipe; Creep strain; Optical window; High temperture;
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Times Cited By KSCI : 1  (Citation Analysis)
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