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IN-PLANE INSENSITIVE DOUBLE-APERTURE digital shearography FOR SLOPE MEASUREMENT

Transactions of Nanjing University of Aeronautics and Astronautics 2012年第4期29卷 367-372页

作者：顾国庆王开福张成斌许星梁智锦南京航空航天大学航空宇航学院

An improved in-plane insensitive double-aperture digital speckle shearing interferometric technique is proposed to measure the first derivative of out-of-plane displacement （slope）. The temporal phase-shifting method is used for the quantitative analysis of fringes. The designed system employs a double-aperture arrange- ment placed in front of the imaging lens. A glass wedge covers one of the two apertures to introduce a laterally shear. The experimental specimen is a circular aluminum plate, clamped along its edge and subjected to both out- of-plane deflection and in-plane rotation. Experimental results show that the fringes obtained from the proposed optical configuration represent pure slope contour distributions, and that the contributions from the in-plane dis- placement components are completely eliminated. Theoretical and experimental results are in good agreement.

关键词： digital shearography slope temporal phase-shifting double-aperture

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Several Phase Modulators for digital shearography

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Chinese Journal of Lasers 1995年第3期B4卷 263-268页

作者： F. CHEN, Y. Y. HUNG(Department of Mechanical Engineering,Oakland University, Rochester Hills,Michigan 48309, USA) Oakland Univ Michigan United States

ＳｅｖｅｒａｌＰｈａｓｅＭｏｄｕｌａｔｏｒｓｆｏｒＤｉｇｉｔａｌＳｈｅａｒｏｇｒａｐｈｙ￥Ｆ．ＣＨＥＮ，Ｙ．Ｙ．ＨＵＮＧ（ＤｅｐａｒｔｍｅｎｔｏｆＭｅｃｈａｎｉｃａｌＥｎｇｉｎｅｅｒｉｎｇ，ＯａｋｌａｎｄＵｎｉｖｅｒ... 详细信息

ＳｅｖｅｒａｌＰｈａｓｅＭｏｄｕｌａｔｏｒｓｆｏｒＤｉｇｉｔａｌＳｈｅａｒｏｇｒａｐｈｙ￥Ｆ．ＣＨＥＮ，Ｙ．Ｙ．ＨＵＮＧ（ＤｅｐａｒｔｍｅｎｔｏｆＭｅｃｈａｎｉｃａｌＥｎｇｉｎｅｅｒｉｎｇ，ＯａｋｌａｎｄＵｎｉｖｅｒｓｉｔｙ，ＲｏｃｈｅｓｔｅｒＨｉｌ...

关键词： digital shearography phase modulator

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New multiplexed system for synchronous measurement of out-of-plane deformation and two orthogonal slopes

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Chinese Physics B 2022年第3期31卷 259-264页

作者： Yonghong Wang Xiao Zhang Qihan Zhao Yanfeng Yao Peizheng Yan Biao Wang School of Instrument Science and Opto-electronics Engineering Hefei University of TechnologyHefei 230009China Anhui Province Key Laboratory of Measuring Theory and Precision Instrument Hefei University of TechnologyHefei 230009China

We propose a novel system for synchronous measurement of out-of-plane deformation and two orthogonal slopes using a single camera. The linearly polarized reference beam introduced by an optical fiber interferes with the unpolarized object beam to measure the out-of-plane deformation. A modified Mach–Zehnder interferometer is used to measure the two orthogonal slopes of the out-of-plane deformation. One of the object beams of the Mach–Zehnder interferometer is an unpolarized beam, and the other object beam is split into two orthogonal linearly polarized object beams by a polarizing prism. The two beams are orthogonally polarized. Hence, they will not interfere with each other. The two polarized beams respectively interfere with the unpolarized beam to simultaneously measure the two orthogonal slopes of the out-of-plane deformation. In addition, the imaging lens and apertures are respectively placed in three optical paths to independently control the carrier frequencies and shearing amounts. The effectiveness of this method can be proved by measuring two pressure-loaded circular plates.

关键词： digital speckle pattern interferometry digital shearography simultaneous measurement of displacement and two orthogonal slopes

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Measurement　of　Vibration　Derivative′s　Amplitude　and　Phase　by　Strobe　and　Optical　Phase　Shifting　shearography

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Chinese Journal of Lasers 1995年第2期B4卷 181-185页

作者： F. Chen, Y. Y. Hung, G. M. Brown(Department of Mechanical Engineering, Oakland University,Rochester Hills, Michigan 48300 USA) Oakland Univ Rochester Hills United States

ＭｅａｓｕｒｅｍｅｎｔｏｆＶｉｂｒａｔｉｏｎＤｅｒｉｖａｔｉｖｅ′ｓＡｍｐｌｉｔｕｄｅａｎｄＰｈａｓｅｂｙＳｔｒｏｂｅａｎｄＯｐｔｉｃａｌＰｈａｓｅＳｈｉｆｔｉｎｇＳｈｅａｒｏｇｒａｐｈｙ￥Ｆ．Ｃｈｅｎ，Ｙ．Ｙ．Ｈｕ... 详细信息

ＭｅａｓｕｒｅｍｅｎｔｏｆＶｉｂｒａｔｉｏｎＤｅｒｉｖａｔｉｖｅ′ｓＡｍｐｌｉｔｕｄｅａｎｄＰｈａｓｅｂｙＳｔｒｏｂｅａｎｄＯｐｔｉｃａｌＰｈａｓｅＳｈｉｆｔｉｎｇＳｈｅａｒｏｇｒａｐｈｙ￥Ｆ．Ｃｈｅｎ，Ｙ．Ｙ．Ｈｕｎｇ，Ｇ．Ｍ．Ｂｒｏｗｎ（Ｄｅｐａ...

关键词： digital shearography vibration measurement

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