Common-path and phase-shift interferometer for length measurement

2004 ◽  
Author(s):  
Xudong Han ◽  
Hua Ai ◽  
Changyuan Han
Keyword(s):  
Phase Shift ◽  
Length Measurement ◽  
Common Path

Two-shot common-path phase-shifting interferometer with a four-step algorithm and an unknown phase shift

2014 ◽  
Vol 53 (10) ◽  
pp. 2067 ◽  
Author(s):  
Zhi Zhong ◽  
Bengong Hao ◽  
Mingguang Shan ◽  
Ying Wang ◽  
Ming Diao ◽  
...  
Keyword(s):  
Phase Shift ◽  
Phase Shifting ◽  
Common Path ◽  
Unknown Phase ◽  
Step Algorithm

High Precision Fiber Length Measurement Technique Based on Modulation Phase Shift Method

2016 ◽  
Vol 45 (7) ◽  
pp. 70706004
Author(s):  
朱兴邦 ZHU Xing-bang ◽  
孙权社 SUN Quan-she ◽  
郑祥亮 ZHENG Xiang-liang ◽  
韩忠 HAN Zhong ◽  
刘志明 LIU Zhi-ming
Keyword(s):  
Phase Shift ◽  
High Precision ◽  
Measurement Technique ◽  
Fiber Length ◽  
Length Measurement ◽  
Shift Method ◽  
Phase Shift Method ◽  
Modulation Phase

Dual-directional shearography based on a modified common-path configuration using spatial phase shift

2019 ◽  
Vol 58 (3) ◽  
pp. 593 ◽  
Author(s):  
Shengjia Wang ◽  
Jie Dong ◽  
Franziska Pöller ◽  
Xingchen Dong ◽  
Min Lu ◽  
...  
Keyword(s):  
Phase Shift ◽  
Spatial Phase ◽  
Common Path ◽  
Spatial Phase Shift

Common-path spatial phase-shift speckle shearography using a glass plate

2019 ◽  
Vol 90 (10) ◽  
pp. 105105 ◽  
Author(s):  
Helia Hooshmand-Ziafi ◽  
Masoomeh Dashtdar ◽  
Khosrow Hassani ◽  
Morvarid Motallebi-Araghi
Keyword(s):  
Phase Shift ◽  
Glass Plate ◽  
Spatial Phase ◽  
Common Path ◽  
Spatial Phase Shift

Surface Shape Measurement for Small Lens Using Phase Shift Shearing Interferometer

2011 ◽  
Vol 5 (2) ◽  
pp. 162-166 ◽  
Author(s):  
Ryohei Hanayama ◽  
◽  
Katsuhiro Ishii
Keyword(s):  
Phase Shift ◽  
Phase Distribution ◽  
Glass Plate ◽  
Surface Shape ◽  
Shape Measurement ◽  
Test Beam ◽  
Common Path ◽  
Shear Plate ◽  
Lens Surface ◽  
Solid Glass

In discussing small-lens surface shape measurement, a shearing interferometer with a plane-parallel glass plate is used to shape a laterally sheared beam from an induced test beam, producing interferogramreflecting wavefront phase distribution. This approach is robust against disturbance thanks to common-path interferometry and to the single solid glass plate. The Degree Of Freedom (DOF) for the shape of targets is high because no reference surfaces are needed. These make our proposal practical for use in the actual factory environment. The phase shift we use to analyze the interference fringe is induced by tilting a shear plate in this configuration, which is far cheaper than conventional equipment using PZT actuators. Our interferometer’s phase distribution shows a differential image of the target wavefront, so detected phase distribution must be integrated to get the original surface shape, as confirmed in the sections that follow.

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