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252 Small displacement measurement of crack opening using One Pitch Phase Analysis (OPPA) method
* 1 , 2 , 3 , 3 , 3
1  Chairman of 4D Sensor Inc., Japan.
2  President of 4D Sensor Inc.
3  4D Sensor Inc.


A new method to measure small displacement of crack width

Keywords: Displacement measurement; Crack opening displacement; One-pitch phase analysis; Sampling moiré method; Phase analysis; Grating