TY - GEN
T1 - 3-D shape measurement using a micro/nano speckle method
AU - Chiang, Fu Pen
AU - Uzer, Gunes
PY - 2006
Y1 - 2006
N2 - When an object is placed at different distances from a camera lens, the resulting images are different in size due to perspective effect. If this effect can be quantitatively measured, it could be used to deduce the shape of a 3D object, because different part of the object occupies different position from the imaging lens. An equation for the perspective effect was derived by Sciammarella and Chiang in 1968 and verified using moiré fringes. It was then called the moiré gap effect and the equation was referred to as the moiré gap equation. An attempt was made in the present study to show that the moiré gap equation can be applied to the random speckle method for strain analysis as well. Furthermore an attempt was also made to use the effect to deduce the 3D shape of an object. Since speckles can be made in micro/nanometer size, one can use the technique to measure 3D shape of very small objects.
AB - When an object is placed at different distances from a camera lens, the resulting images are different in size due to perspective effect. If this effect can be quantitatively measured, it could be used to deduce the shape of a 3D object, because different part of the object occupies different position from the imaging lens. An equation for the perspective effect was derived by Sciammarella and Chiang in 1968 and verified using moiré fringes. It was then called the moiré gap effect and the equation was referred to as the moiré gap equation. An attempt was made in the present study to show that the moiré gap equation can be applied to the random speckle method for strain analysis as well. Furthermore an attempt was also made to use the effect to deduce the 3D shape of an object. Since speckles can be made in micro/nanometer size, one can use the technique to measure 3D shape of very small objects.
UR - http://www.scopus.com/inward/record.url?scp=33750324121&partnerID=8YFLogxK
M3 - Conference contribution
AN - SCOPUS:33750324121
SN - 091205395X
SN - 9780912053950
T3 - Proceedings of the 2006 SEM Annual Conference and Exposition on Experimental and Applied Mechanics 2006
SP - 1385
EP - 1388
BT - Proceedings of the 2006 SEM Annual Conference and Exposition on Experimental and Applied Mechanics 2006
T2 - SEM Annual Conference and Exposition on Experimental and Applied Mechanics 2006
Y2 - 4 June 2006 through 7 June 2006
ER -