Studies of the properties of the temporal phase-shifting method applied to silicone microelement vibration investigations using the time-average method

2004 ◽  
Author(s):  
Krzysztof Patorski ◽  
Zbigniew Sienicki ◽  
Michal Pawlowski ◽  
Adam R. Styk ◽  
Agata Jzwicka
Keyword(s):  
Average Method ◽  
Phase Shifting ◽  
Temporal Phase ◽  
Phase Shifting Method ◽  
Time Average

Defect Detection in Optical Disk Substrate by Mach-Zehnder Interferometer

2013 ◽  
Vol 534 ◽  
pp. 149-153 ◽  
Author(s):  
Yoshitaka Takahashi ◽  
Kazuki Morishima ◽  
Masayuki Yokota
Keyword(s):  
Error Detection ◽  
Average Method ◽  
Moving Average ◽  
Phase Shifting ◽  
Zehnder Interferometer ◽  
Process Error ◽  
Phase Shifting Method ◽  
Optical Disks ◽  
Binary Image Processing ◽  
Mach Zehnder Interferometer

In recent years optical disks have been very popular and in manufacturing process error detection in optical disks becomes very important, especially for the defects whose size of a few millimeters in length and several hundred nanometers in depth. The authors have developed a new system to measure the defects of disk substrates using a Mach-Zehnder interferometer with a phase shifting method. But it was found that optical disks had undulation of the optical thickness and it disturbed the detection of defects. To solve the problem moving-average method was developed and introduced in data processing to distinguish the defect from the undulation, and with modified unwrapping program the defect was visualized by binary image processing.

scholarly journals Birefringence measurement by four-step phase-shifting method on triple-polarizer plane polariscope

2013 ◽  
Vol 52 (4) ◽  
pp. 040501 ◽  
Author(s):  
Xusheng Zhang ◽  
Chuan He ◽  
Haoyu Wang
Keyword(s):  
Phase Shifting ◽  
Phase Shifting Method

Phase-shifting method with a normal polariscope

1999 ◽  
Vol 38 (28) ◽  
pp. 5931 ◽  
Author(s):  
Anand Asundi ◽  
Liu Tong ◽  
Chai Gin Boay
Keyword(s):  
Phase Shifting ◽  
Phase Shifting Method

scholarly journals An Error-Reduction Method for Temporal Phase Unwrapping Based on Double Three-Step Phase-Shifting and Least-Squares Fitting

2012 ◽  
Vol 6-7 ◽  
pp. 76-81
Author(s):  
Yong Liu ◽  
Ding Fa Huang ◽  
Yong Jiang
Keyword(s):  
Least Squares ◽  
Reduction Method ◽  
Intermediate Phase ◽  
Error Reduction ◽  
Phase Unwrapping ◽  
Phase Shifting ◽  
Surface Measurement ◽  
Acquisition Time ◽  
Least Squares Fitting ◽  
Temporal Phase

Phase-shifting interferometry on structured light projection is widely used in 3-D surface measurement. An investigation shows that least-squares fitting can significantly decrease random error by incorporating data from the intermediate phase values, but it cannot completely eliminate nonlinear error. This paper proposes an error-reduction method based on double three-step phase-shifting algorithm and least-squares fitting, and applies it on the temporal phase unwrapping algorithm using three-frequency heterodyne principle. Theoretical analyses and experiment results show that this method can greatly save data acquisition time and improve the precision.

A flexible phase-shifting method with absolute phase marker retrieval

Measurement ◽  
2012 ◽  
Vol 45 (1) ◽  
pp. 101-108 ◽  
Author(s):  
Haihua Cui ◽  
Wenhe Liao ◽  
Ning Dai ◽  
Xiaosheng Cheng
Keyword(s):  
Phase Shifting ◽  
Absolute Phase ◽  
Phase Shifting Method
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