Three-Dimensional Heat Flow Visualization with a Laser Holographic Interferometry

1992 ◽  
pp. 520-524
Author(s):  
Seizo Kato ◽  
Naoki Maruyama
Keyword(s):  
Heat Flow ◽  
Flow Visualization ◽  
Holographic Interferometry ◽  
Three Dimensional ◽  
Laser Holographic Interferometry

Laser Interferometry Hologram Registration for Three-Dimensional Precision Measurements

2006 ◽  
Vol 128 (4) ◽  
pp. 1006-1013 ◽  
Author(s):  
Zhenhua Huang ◽  
Albert J. Shih ◽  
Jun Ni
Keyword(s):  
Holographic Interferometry ◽  
Three Dimensional ◽  
Surface Profile ◽  
Laser Interferometry ◽  
Depth Of Field ◽  
Registration Method ◽  
Dimensional Precision ◽  
Data Registration ◽  
Cross Correlation Analysis ◽  
Laser Holographic Interferometry

A hologram registration method is developed for the laser holographic interferometry measurement of the 3D surface profile of objects which are larger than the field of view (FOV). The theory of laser holographic interferometry, including the phase-shifting and multiwavelength tuning, is described. The hologram registration without using targets is elaborated. The cross-correlation analysis is used to find the translation and overlapped regions, which determine the tilt and shift correction for data registration. The proposed method is validated using two examples with different approaches. The first example, a wheel hub, is smaller than the FOV and demonstrates only 0.1μm discrepancy of the surface flatness between the registered and standard measurements. The second example, an engine combustion deck surface, is larger than the FOV. The registered surface measurements are compared to that of coordinate measurement machine (CMM) with only 2.5% discrepancy of the peak-to-valley flatness. This data registration method enables the sub-μm precision and large depth of field (several centimeters) measurement of large size objects.

Laser Interferometry Hologram Registration for Three-Dimensional Precision Measurements

2006 ◽  
Author(s):  
Z. Huang ◽  
A. J. Shih ◽  
J. Ni
Keyword(s):  
Holographic Interferometry ◽  
Three Dimensional ◽  
Laser Interferometry ◽  
Depth Of Field ◽  
Measurement Technology ◽  
Registration Method ◽  
Dimensional Precision ◽  
Data Registration ◽  
Cross Correlation Analysis ◽  
Laser Holographic Interferometry

Laser holographic interferometry is an advanced precision measurement technology with sub-μm accuracy and large, over 17 mm, depth-of-field. The limitation of current laser holographic interferometry is the limited measurement area, which cannot be larger than the field of view (FOV). A hologram registration method without using targets is developed to overcome this problem. The theory of laser holographic interferometry, including the phase-shifting and multi-wavelength tuning, is described. The cross-correlation analysis is used to find the translation and overlapped regions, which determine the tilt and shift correction for data registration. The proposed method is validated using two examples with different approaches. The first example, a wheel hub, is smaller than the FOV and demonstrates only 0.1 μm discrepancy of the surface flatness between the registered and standard measurements. The second example, an engine combustion deck surface, is larger than the FOV. The registered surface measurements are compared to that of coordinate measurement machine (CMM) with only 2.5% discrepancy of the peak-to-valley flatness. This data registration method enables the sub-μm precision and large depth of field (several centimeters) measurement of large size objects.

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