Image Measurement Strategy for Extreme Circumstances
A new strategy of image measurement in an extreme circumstance was proposed, according to the high-accuracy measuring requirements in high-low temperature. A camera imaging model was chosen and analyzed. A precise vision measurement system was designed based on a comprehensive analysis of the ambient influences on the system. The system utilized camera temperature control device, high-intensity light source, telecentric lens and vibration isolation platform to ensure imaging quality, such as low distortion, high contrast and stability. A quartz standard part with very low coefficient of linear expansion was chosen, combined with sub-pixel feature extraction algorithm, so as to realize a real-time calibration of the measurement system errors. Through a continuous 60 h and three temperature cycle measurement experiment in an extreme circumstance, the results show that the system can work stably for a long period and can achieve high measurement accuracy.
KeywordsHigh-low temperature Image measurement Real-time calibration Sub-pixel
This work was supported by National Natural Science Foundation (No. 51175377) and Tianjin Natural Science Foundation (No.12JCQNJC02700).
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