TY - GEN
T1 - Visualization of deformation by secondary speckle sensing
AU - Garcia, Javier
AU - Micó, Vicente
AU - Sanz-Sabater, Martín
AU - Beiderman, Yevgeny
AU - Zalevsky, Zeev
PY - 2013
Y1 - 2013
N2 - In this contribution we propose a new technique for deformation measurement based upon a multipoint speckle imaging using the correlation statistics of speckle patterns. The system is capable of interferometric accuracy, although it relies on self-interference, shown as speckle patterns on the detector plane. Therefore, most of the constraints imposed by interferometric setups no longer apply. A camera is used to capture images at the desired frame rate, a collimated laser and a diffractive optical element, achieving a high number of inspection points opens the possibility for analyzing simultaneously a plurality of inspected points. Proper adjustment of the optical parameters (aperture size and shape) can deal with the measurements at different locations of the object's surface with no crosstalk between the outputs for each inspected point. The data from the different inspected locations can be analyzed separately or integrated to provide a global surface change in shape. The system has two major advantages. On one hand, it uses few hardware elements, making the system easily portable and compact. On the other hand the system needs a laser source with relatively low degree of coherence, as interference is done on the tested surface itself and no external coherent reference is needed. The system can be packed in a compact enclosure and it can operate at an arbitrary distance from the inspected object, limited only by intensity available on the detector and sensor's sensitivity. The system can work at frame rate allowed by the camera in the selected region of interest.
AB - In this contribution we propose a new technique for deformation measurement based upon a multipoint speckle imaging using the correlation statistics of speckle patterns. The system is capable of interferometric accuracy, although it relies on self-interference, shown as speckle patterns on the detector plane. Therefore, most of the constraints imposed by interferometric setups no longer apply. A camera is used to capture images at the desired frame rate, a collimated laser and a diffractive optical element, achieving a high number of inspection points opens the possibility for analyzing simultaneously a plurality of inspected points. Proper adjustment of the optical parameters (aperture size and shape) can deal with the measurements at different locations of the object's surface with no crosstalk between the outputs for each inspected point. The data from the different inspected locations can be analyzed separately or integrated to provide a global surface change in shape. The system has two major advantages. On one hand, it uses few hardware elements, making the system easily portable and compact. On the other hand the system needs a laser source with relatively low degree of coherence, as interference is done on the tested surface itself and no external coherent reference is needed. The system can be packed in a compact enclosure and it can operate at an arbitrary distance from the inspected object, limited only by intensity available on the detector and sensor's sensitivity. The system can work at frame rate allowed by the camera in the selected region of interest.
KW - Deformation sensing
KW - Interferometry
KW - Speckle
KW - Vibration sensing
UR - http://www.scopus.com/inward/record.url?scp=84899930273&partnerID=8YFLogxK
U2 - 10.1117/12.2020854
DO - 10.1117/12.2020854
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AN - SCOPUS:84899930273
SN - 9780819496089
T3 - Proceedings of SPIE - The International Society for Optical Engineering
BT - Optical Methods for Inspection, Characterization, and Imaging of Biomaterials
PB - SPIE
T2 - Optical Methods for Inspection, Characterization, and Imaging of Biomaterials
Y2 - 15 May 2013 through 16 May 2013
ER -