Digital phase-shifting shearography for strain measurement by using a rotating platform system

2005 ◽  
Vol 44 (8) ◽  
pp. 085601 ◽  
Author(s):  
Ping Sun
Keyword(s):  
Strain Measurement ◽  
Phase Shifting ◽  
Rotating Platform ◽  
Digital Phase ◽  
Platform System

Single-shot digital phase-shifting Moiré patterns for 3D topography

2020 ◽  
Vol 60 (4) ◽  
pp. A84
Author(s):  
Haiyun Guo ◽  
Haowen Zhou ◽  
Partha P. Banerjee
Keyword(s):  
Phase Shifting ◽  
Single Shot ◽  
Digital Phase ◽  
3D Topography ◽  
Moire Patterns ◽  
Moiré Patterns

A New Method for Platform Inertial Navigation Initial Alignment Based on Rotation Mode

2014 ◽  
Vol 543-547 ◽  
pp. 1344-1350
Author(s):  
Ming Yi Liu ◽  
Jing Juan Zhang ◽  
Xue Yun Wang ◽  
Ran Li
Keyword(s):  
Navigation System ◽  
Inertial Navigation System ◽  
Inertial Navigation ◽  
New Method ◽  
Initial Alignment ◽  
Rotating Platform ◽  
Rotation Mode ◽  
Speed Rotation ◽  
Platform System ◽  
Method Analysis

A new method for rotation mode platform inertial navigation initial alignment is presented. This method is based on sinusoidal varying speed rotation mode and thus makes the factors decoupling in real time. In this way it makes the estimation process much faster and more precise compared with previous methods. The error equations of a rotating platform inertial navigation system are introduced. We give detailed description and analysis of this method. Simulation is done based on this new method. Analysis and simulation results indicate that this method makes the platform system initial alignment achieved desired results in 207.5 seconds, while the traditional methods takes 388.1 seconds. The accuracy also has highly improved. The standard deviation of gyroscope drift decreased from 0.03°/h to 0.005°/h. This provides a theoretical foundation for platform inertial navigation system rotating mode during actual experiment and application.

A direct conversion receiver employing a frequency multiplied digital phase-shifting demodulator

1994 ◽  
Vol 77 (4) ◽  
pp. 29-37
Author(s):  
Makoto Hasegawa ◽  
Masahiro Mimura ◽  
Kazuaki Takahashi ◽  
Mitsuo Makimoto
Keyword(s):  
Direct Conversion ◽  
Phase Shifting ◽  
Digital Phase
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