Journal ArticleDOI
Precision roll angle measurement based on digital speckle pattern interferometry
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TLDR
In this article, a simple relationship between the roll angle and interferometric phase distribution is established by analyzing the mechanism of fringe formation in the process of roll detection using a dual-beam DSPI, and reasonable approximate processing.Abstract:
An approach to precise measurement of small roll angle based on digital speckle pattern interferometry (DSPI) is introduced. A simple relationship between the roll angle and interferometric phase distribution is established by analyzing the mechanism of fringe formation in the process of roll detection using a dual-beam DSPI, and reasonable approximate processing. The presented method enjoys some important advantages, such as being free of a cooperative target and a very high measurement resolution. In our experiments, a measurement resolution of 1 µrad, which can compete with the best resolution of the existing methods, is achieved. Theoretically, the measurement resolution can even be improved to tens of nano-radians at the cost of increasing the size of the measuring device. The performance of the method is also demonstrated by a comparison experiment.read more
Citations
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Journal ArticleDOI
Measurement of In-Plane Displacement in Two Orthogonal Directions by Digital Speckle Pattern Interferometry
TL;DR: In this paper, a spatial carrier phase-shift digital speckle pattern interferometry (DSPI) was proposed for the simultaneous measurement of in-plane displacement in two orthogonal directions.
Journal ArticleDOI
DSPI Filtering Evaluation Method Based on Sobel Operator and Image Entropy
TL;DR: In this article, the authors proposed an image-filtering evaluation method based on the Sobel operator and image entropy, which can quantitatively evaluate the filtering process of the DSPI.
Journal ArticleDOI
Simultaneous Measurement of Three-Dimensional Displacement Gradients Using Tri-color Digital Shearography
TL;DR: In this paper, a tri-color Michelson-type spatial phase shift digital shearography is introduced to measure three displacement gradients, including one out-of-plane component and two in-plane components, simultaneously.
Journal ArticleDOI
Non-contact and fast measurement of small roll angle using digital shearography
TL;DR: In this paper , a noncontact, fast, and precision measurement of small roll angle using digital shearography is introduced, where the roll angles are determined directly by recording the interferometric phase changes when using a dual-beam digital sheerography to measure tested surfaces.
Journal ArticleDOI
Non-contact and fast measurement of small roll angle using digital shearography
TL;DR: In this paper, a noncontact, fast, and precision measurement of small roll angle using digital shearography is introduced, where the roll angles are determined directly by recording the interferometric phase changes when using a dual-beam digital sheerography to measure tested surfaces.
References
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Journal ArticleDOI
Interferometric displacement measurement on scattering surfaces utilizing speckle effect
TL;DR: In this article, the distribution of intensity in the resultant pattern depends on the relative phases of the component patterns, and by measuring the correlation between the resultant patterns at two different times a change of relative phase is detected.
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Review of electronic speckle pattern interferometry (ESPI) for three dimensional displacement measurement
TL;DR: A review of the recent developments in ESPI systems for 3D displacement and strain measurement can be found in this article, where the basic theory, a brief derivation and different optical layouts are presented.
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A three-axis autocollimator for detection of angular error motions of a precision stage
TL;DR: In this paper, a collimated laser beam from a laser diode is projected onto a grating reflector mounted on the stage and the reflected 0th-order diffracted beam is received by an autocollimation unit, which consists of a collimator objective and a quadrant photodiode, for detecting the pitch and yaw errors.
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Whole field in-plane vibration analysis using pulsed phase-stepped ESPI
TL;DR: Electronic speckle pattern interferometry has been used to study resonant in-plane vibrations of a thin square metal plate using dual-beam illumination from a pulsed laser to determine the amplitude and phase for the horizontal and vertical components of in- plane vibration.
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Compact optical roll-angle sensor with large measurement range and high sensitivity.
TL;DR: A simple and effective optical roll-angle sensor based on a magnetic garnet single crystal that is insensitive to various fluctuations such as optical intensity, photodiode responsivity, and temperature and to vibrations is demonstrated.