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  4. Speckle pattern modulation for high-resolution displacement measurements
 
Zitierlink DOI
10.26092/elib/3654
Verlagslink DOI
10.1117/12.2591847

Speckle pattern modulation for high-resolution displacement measurements

Veröffentlichungsdatum
2021-06-20
Autoren
Schweickhardt, León  
Tausendfreund, Andreas  
Stöbener, Dirk  
Fischer, Andreas  
Zusammenfassung
For digital image speckle correlation (DISC), a novel approach is introduced where an ensemble average over
multiple different speckle patterns is calculated. As a result, the measurement uncertainty of the displacement
is reduced by an order of magnitude without deteriorating the spatial resolution. This enables precise surface
displacement field measurements in the micrometer range with a measurement uncertainty lower than 100nm
at a spatial resolution below 20 μm. By using a digital micromirror device (DMD) for illumination modulation,
measuring rates in the range of 25 Hz are possible while each measurement is based on 80 images.
Schlagwörter
Speckle pattern

; 

Diffusers

; 

Modulation

; 

Spatial resolution

; 

Digital micromirror devices

; 

Speckle

; 

Digital image correlation
Verlag
Society of Photo‑Optical Instrumentation Engineers (SPIE)
Institution
Universität Bremen  
Fachbereich
Fachbereich 04: Produktionstechnik, Maschinenbau & Verfahrenstechnik (FB 04)  
Zentrale Wissenschaftliche Einrichtungen und Kooperationen  
Institute
Bremer Institut für Messtechnik, Automatisierung und Qualitätswissenschaft (BIMAQ)  
MAPEX Center for Materials and Processes  
Dokumenttyp
Konferenzbeitrag
Zeitschrift/Sammelwerk
Proceedings Volume 11782, Optical Measurement Systems for Industrial Inspection XII  
Zweitveröffentlichung
Ja
Dokumentversion
Published Version
Lizenz
Alle Rechte vorbehalten
Sprache
Englisch
Dateien
Lade...
Vorschaubild
Name

Schweickhardt et al_Speckle pattern modulation for high-resolution displacement measurements_2021_published-version.pdf

Size

4.33 MB

Format

Adobe PDF

Checksum

(MD5):005f64716584698258e9b1ef5674944d

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