Laser & Optoelectronics Progress, Volume. 51, Issue 10, 101201(2014)
Investigation of the Optimal Light Condition on Digital Image Correlation Method
The effect of lighting conditions on digital speckle correlation method (DSCM) measurement accuracy is researched, and the optimal parameters and light condition for digital speckle correlation calculation are obtained. Through theoretical analysis of the model of DSCM, the relational expression of error about the frequency and average gray gradient is obtained. The optimal digital speckles size, fitting window size and calculation window size are got with computer simulation of digital speckle image. Leading into the technology of GSI in physical experiment, the accurate displacement is got and the error of different light conditions is analyzed, finding the connection about light with the frequency and average gray gradient through studying the digital speckle images. Experiments show that 8000 lx is the optimal light condition in DSCM, when average gray gradient is high and DSCM measurement is precision.
Get Citation
Copy Citation Text
Yu Zhijing, Tao Hongwei. Investigation of the Optimal Light Condition on Digital Image Correlation Method[J]. Laser & Optoelectronics Progress, 2014, 51(10): 101201
Category: Instrumentation, Measurement and Metrology
Received: Apr. 23, 2014
Accepted: --
Published Online: Sep. 10, 2014
The Author Email: Zhijing Yu (hit_yu@126.com)