Research on Digital Image Correlation Measurement Technology for Light Intensity Factor
In the micro deformation measurement of spacecraft component structures using array image correlation(DIC)measurement technology,the impact of measurement errors caused by changes in ambient light intensity on measurement accuracy and reliability of measurement results is currently a problem that needs to be addressed.This article conducts a study on the stability of DIC measurement systems based on changes in light intensity.For the same specimen under the same load,image acquisition and data analysis are carried out to study the impact of light intensity changes on DIC measurement results.The results show that within a certain range of light intensity,changes in the testing environment's light intensity will bring maximum measurement errors of 0.003 mm and 0.008 mm to DIC in-plane and out of plane rigid body displacement measurement,respectively.However,the accuracy requirement for micro deformation measurement of spacecraft structures is generally at the micrometer level,so the impact of light intensity changes cannot be ignored.In response to this issue,the ambient light separation technology designed in this article maintains the accuracy of DIC rigid body displacement measurement at 0.001 mm in plane and 0.002 mm out of plane under extreme light intensity conditions,with good measurement accuracy and stability,which can meet the precision requirements of micrometer level deformation measurement for highly stable structures of spacecraft.
DIChigh stability structure of spacecraftambient lightmeasurement accuracy
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