A Video Optical Extensometer Based on Virtual Instrument
A video optical extensometer based on the virtual instrument LabVIEW Vision software platform is developed in this paper. A general CCD camera DH-HV-1303UM with Dynamic Link Library is used to complete real-time image acquisition and LabVIEW Vision platform is used to complete image processing. The algorithm of the center of gravity is adopted for the displacement measurement. This smart extensometer shows the high ratio of performance to price and reliability. A calibration experiment is completed and if resolution large than 0.05 pixel, the relative error is less than 3.5%.
KeywordsMarker Point Calibration Experiment Maximum Relative Error Virtual Instrument Video Extensometer
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