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APPLICATION TO STRUCTURAL ANALYSIS OF ESPI, HOLOGRAPHY AND 3D SHAPE MEASUREMENT Nagasaki University, Graduate School Yasuaki SUGIHARA Tomofumi NAKYAJIMA.

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Presentation on theme: "APPLICATION TO STRUCTURAL ANALYSIS OF ESPI, HOLOGRAPHY AND 3D SHAPE MEASUREMENT Nagasaki University, Graduate School Yasuaki SUGIHARA Tomofumi NAKYAJIMA."— Presentation transcript:

1 APPLICATION TO STRUCTURAL ANALYSIS OF ESPI, HOLOGRAPHY AND 3D SHAPE MEASUREMENT Nagasaki University, Graduate School Yasuaki SUGIHARA Tomofumi NAKYAJIMA Masataka MORI Nagasaki University Naoki MATSUYAMA Hiroshi MATSUDA

2 ■ The measurement method is easy, and precision is high ■ Now the strain measurement method spreading most widely Problems Measurement at a contact-type and fixed point ■ Measurement only for gauge pasting point ■ Use limit by environment, amount of strain, and fatigue It is necessity of non contact and full field measurement Strain gauge method Introduction ・ Three dimensional shape measurement ・ Holography interferometry measurement ・ Electronic Speckle Pattern Interferometry(ESPI) measurement

3 Three dimensional shape measuring system Feature 3D coordinates of the object can be measured ・ Portable and generality are abundant ・ Measurement time is short The shape of Concrete Joint and Nagasaki Peaceful Prayer was measured

4 Shape measurement of Concrete Joint Concrete Joint3D shape data Detailed 3D coordinates of Concrete Joint surface was obtained

5 3D shape measurement of Nagasaki Peaceful Prayer From 8 directions Point group dataShape data Shape data is obtained by connecting point group data, and pasting surface Detailed 3D coordinates of Nagasaki Peaceful Prayer surface was obtained

6 Holographic interferometry measuring system Measurement of small deformation and vibration are possible by obtaining interference fringes ・ Measurement time is short ・ Measurement in darkroom The vibration of Twisted Conical Shells and Notched Specimen was measured Holographic interferometry measuring system Feature

7 Free vibration modes of Twisted Conical Shells Specimen FE analysis Holography Mode of vibration Frequencies and modes of vibration almost agree with the FE analytical results 8th mode 3289(Hz) 3522(Hz)

8 Vibration modes of the Notched Specimen Holography Mode of vibration Frequencies and modes of vibration almost agree with the FE analytical results FE analysis 3rd mode 520(Hz) 538(Hz)

9 ESPI measuring system ・ Measurement under visible light is possible ・ Non contact and full field measurement From an interference fringe of speckle provided by interference of a laser, measurement of displacement of an object is possible Electric Speckle Pattern Interferometry (ESPI) measuring system Feature The displacement of Tensioned membrane and Defective Plate was measured

10 Wrinkle measurement of Tensioned membrane Wrinkle Distribution of a minor principal strain Research of membrane structure Specific in time and the place of the wrinkle generation is necessary ESPI measuring system enables specific in the wrinkle generation part

11 Tensile Test of the Defective Plate Specimen Load - Maximum principal strain curve The concentration of the strain was able to be confirmed to the vicinity of the breaking side at the small load level by ESPI measuring system Strain (μ) Load (N)

12 Summary Application of optical measurement technology to structure APPLICATION TO STRUCTURAL ANALYSIS ・ Information that was not able to be seen by eyes can be acquired ・ Enormous 3D coordinate information can be acquired in a short time

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14 ESPI の原理 変位 u に対する位相差の増分 Δφ Δφ = sinθ 4 πu λ 光学系 CCD カメラ レーザー光 レンズ 対象物 θ Δφ が2 π 変化するごとに 干渉縞が1本発生する 干渉縞 u スペックルパター ン

15 Principle of ESPI Increment of phase difference Δφ to displacement u Δφ = sinθ 4 πu λ Optical system CCD laser beams lens object θ Δφ が2 π 変化するごとに 干渉縞が1本発生する Interference fringes u Speckle pattern Electric Speckle Pattern Interferometry(ESPI) measuring system

16 長崎平和祈念像の形状計測 変位分布 応力分布


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