Speckle pattern modulation for high-resolution displacement measurements
Veröffentlichungsdatum
2021-06-20
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.
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
Dokumenttyp
Konferenzbeitrag
Zeitschrift/Sammelwerk
Zweitveröffentlichung
Ja
Dokumentversion
Published Version
Lizenz
Sprache
Englisch
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Name
Schweickhardt et al_Speckle pattern modulation for high-resolution displacement measurements_2021_published-version.pdf
Size
4.33 MB
Format
Adobe PDF
Checksum
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