Surface deformation measurement by photothermal deflection technique

1996 ◽  
Author(s):  
Mario Bertolotti ◽  
Roberto Li Voti ◽  
Stefano Paoloni ◽  
Concita Sibilia ◽  
G. L. Liakhou
Keyword(s):  
Surface Deformation ◽  
Deformation Measurement ◽  
Photothermal Deflection

Free-surface deformation measurement

1997 ◽  
Author(s):  
H. Stahl ◽  
Kevin Stultz ◽  
H. Stahl ◽  
Kevin Stultz
Keyword(s):  
Free Surface ◽  
Surface Deformation ◽  
Deformation Measurement ◽  
Free Surface Deformation

scholarly journals Spatial Baseline Optimization for Spaceborne Multistatic SAR Tomography Systems

Sensors ◽  
2019 ◽  
Vol 19 (9) ◽  
pp. 2106 ◽  
Author(s):  
Jiuchao Zhao ◽  
Anxi Yu ◽  
Yongsheng Zhang ◽  
Xiaoxiang Zhu ◽  
Zhen Dong
Keyword(s):  
Surface Deformation ◽  
Design Method ◽  
Geometric Model ◽  
Three Dimensional ◽  
Optimization Method ◽  
Deformation Measurement ◽  
Experimental Simulation ◽  
Baseline Design ◽  
Imaging Performance ◽  
The Impact

Spaceborne multistatic synthetic aperture radar (SAR) tomography (SMS-TomoSAR) systems take full advantage of the flexible configuration of multistatic SAR in the space, time, phase, and frequency dimensions, and simultaneously achieve high-precision height resolution and low-deformation measurement of three-dimensional ground scenes. SMS-TomoSAR currently poses a series of key issues to solve, such as baseline optimization, spatial transmission error estimation and compensation, and the choice of imaging algorithm, which directly affects the performance of height-dimensional imaging and surface deformation measurement. This paper explores the impact of baseline distribution on height-dimensional imaging performance for the baseline optimization issue, and proposes a feasible baseline optimization method. Firstly, the multi-base multi-pass baselines of an SMS-TomoSAR system are considered equivalent to a group of multi-pass baselines from monostatic SAR. Secondly, we establish the equivalent baselines as a symmetric-geometric model to characterize the non-uniform characteristic of baseline distribution. Through experimental simulation and model analysis, an approximately uniform baseline distribution is shown to have better SMS-TomoSAR imaging performance in the height direction. Further, a baseline design method under uniform-perturbation sampling with Gaussian distribution error is proposed. Finally, the imaging performance of different levels of perturbation is compared, and the maximum baseline perturbation allowed by the system is given.

A New Approach to Surface Deformation Measurement from Phase-stepped Holographic Fringes

1995 ◽  
Vol 42 (6) ◽  
pp. 1271-1279 ◽  
Author(s):  
C. Quan ◽  
H.M. Shang ◽  
C.J. Tay ◽  
P.J. Bryanston-cross
Keyword(s):  
Surface Deformation ◽  
Deformation Measurement ◽  
New Approach

scholarly journals Organ Surface Deformation Measurement and Analysis in Open Hepatic Surgery: Method and Preliminary Results From 12 Clinical Cases

2011 ◽  
Vol 58 (8) ◽  
pp. 2280-2289 ◽  
Author(s):  
Logan W. Clements ◽  
Prashanth Dumpuri ◽  
William C. Chapman ◽  
Benoit M. Dawant ◽  
Robert L. Galloway ◽  
...  
Keyword(s):  
Surface Deformation ◽  
Deformation Measurement ◽  
Hepatic Surgery ◽  
Preliminary Results ◽  
Measurement And Analysis ◽  
Clinical Cases
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