Speckle interferometry measurements in a motored engines

1986 ◽  
Author(s):  
Patrick V. Farrell ◽  
Dean D. Verhoeven
Keyword(s):  
Speckle Interferometry

scholarly journals Development of a Compound Speckle Interferometer for Precision Three-Degree-of-Freedom Displacement Measurement

Sensors ◽  
2021 ◽  
Vol 21 (5) ◽  
pp. 1828
Author(s):  
Hung-Lin Hsieh ◽  
Bo-Yen Sun
Keyword(s):  
Speckle Interferometry ◽  
Degree Of Freedom ◽  
Heterodyne Interferometry ◽  
Beam Splitting ◽  
Speckle Interferometer ◽  
Real World Applications ◽  
Three Degree Of Freedom ◽  
Contact Displacement ◽  
Displacement Measurements ◽  
Measurement Capabilities

In this study, a compound speckle interferometer for measuring three-degree-of-freedom (3-DOF) displacement is proposed. The system, which combines heterodyne interferometry, speckle interferometry and beam splitting techniques, can perform precision 3-DOF displacement measurements, while still having the advantages of high resolution and a relatively simple configuration. The incorporation of speckle interferometry allows for non-contact displacement measurements by detecting the phase of the speckle interference pattern formed from the convergence of laser beams on the measured rough surface. Experiments were conducted to verify the measurement capabilities of the system, and the results show that the proposed system has excellent measurement capabilities suitable for future real-world applications.

scholarly journals Microshape Measurement Method Using Speckle Interferometry Based on Phase Analysis

Photonics ◽  
2021 ◽  
Vol 8 (4) ◽  
pp. 112
Author(s):  
Yasuhiko Arai
Keyword(s):  
Fine Structure ◽  
Phase Analysis ◽  
Measurement Method ◽  
Phase Distribution ◽  
Periodic Structures ◽  
Scattered Light ◽  
Speckle Interferometry ◽  
Diffraction Limit ◽  
Silica Microspheres ◽  
Measured Object

A method for the measurement of the shape of a fine structure beyond the diffraction limit based on speckle interferometry has been reported. In this paper, the mechanism for measuring the shape of the fine structure in speckle interferometry using scattered light as the illumination light is discussed. Furthermore, by analyzing the phase distribution of the scattered light from the surface of the measured object, this method can be used to measure the shapes of periodic structures and single silica microspheres beyond the diffraction limit.

scholarly journals A Whole-Field Interferometric Scheme for Measuring strain and Flow Rates of Glacier and Other Natural Surfaces

1983 ◽  
Vol 29 (103) ◽  
pp. 492-497
Author(s):  
Gary Cloud ◽  
Edgar Conley
Keyword(s):  
Displacement Vector ◽  
Surface Displacement ◽  
Time Lapse ◽  
Speckle Interferometry ◽  
Narrow Beam ◽  
Coherent Light ◽  
Ice Surface ◽  
Glacier Ice ◽  
Fringe Patterns ◽  
Small Overlap

AbstractThe flow of glacier ice is mapped using high-resolution photography and non-coherent-light speckle interferometry. Young’s fringe patterns result when a double-exposed photoplate image of the straining surface is illuminated by a narrow beam of coherent light. Geometry gives a relationship between the ice surface displacement vector and the interference fringe patterns. This displacement vector is corrected for rigid-body (camera) movement and projected onto the ice surface using topological maps. The strain during the time-lapse interval is thus known. Comparison with data acquired by surveying techniques at Nisqually Glacier, Washington, U.S.A., is limited because of small overlap of the surface studied. In the areas for which results can be compared, our experiments yield a flow of 0.6 m/d where conventional methods yield about 0.4 m/d.

scholarly journals Fast Drift-Scan CCD Imaging and Photometry with Small Telescopes: Lunar Occultations and Speckle Interferometry

2001 ◽  
Vol 183 ◽  
pp. 309-314
Author(s):  
Jorge Núñez ◽  
Octavi Fors
Keyword(s):  
Data Analysis ◽  
Speckle Interferometry ◽  
Close Binary ◽  
Ccd Cameras ◽  
Ccd Imaging ◽  
Scanning Technique ◽  
Photometric Observations ◽  
Drift Scan ◽  
Fast Drift ◽  
Year 2000

AbstractIn this paper we show how inherent features of typical CCD cameras can be used for fast (in the order of milliseconds) photometric observations (FPO), even with submeter class telescopes. This is based on a modified drift-scanning technique which we show to be advantageous for such kind of observations. In particular, we successfully carried out some lunar occultations and speckle interferometry observations using this technique. During the year 2000, we registered several occultation events. In particular, we present the occultation of SAO79031. The millisecond photometry of the event allows us subsequent data analysis for stellar diameter estimation and close binary detection. We also show an example of the application of the technique to speckle interferometry observations. Finally, we present the main characteristics of our project to build a new remotely controlled observatory near Barcelona.

FIRST RESULTS OF THE OPTICAL SPECKLE INTERFEROMETRY WITH THE 3.5 m TELESCOPE AT CALAR ALTO (SPAIN): MEASUREMENTS AND ORBITS OF VISUAL BINARIES

2008 ◽  
Vol 135 (5) ◽  
pp. 1803-1809 ◽  
Author(s):  
J. A. Docobo ◽  
V. S. Tamazian ◽  
M. Andrade ◽  
J. F. Ling ◽  
Y. Y. Balega ◽  
...  
Keyword(s):  
Speckle Interferometry ◽  
First Results ◽  
Calar Alto ◽  
Visual Binaries

Characterization of microvibrations by speckle interferometry

1995 ◽  
Author(s):  
Roland Hoefling ◽  
Volkmar Liebig ◽  
Claus-Dieter Schmidt
Keyword(s):  
Speckle Interferometry
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