Method and system for recalibration during micro-imaging to determine thermal drift
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United States of America Patent
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Jul 27, 2004
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app pub date -
Jun 15, 2000
filing date -
Jun 15, 2000
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Abstract
A method of recalibrating to compensate for thermal drift between a micro-imaging system and a sample integrated circuit (IC) under investigation determines a planar drift using a cross-correlation between a reference calibration image and a recalibration image, and further determines a focus drift from a difference between a reference focus setting and a recalibration focus setting. The recalibration is performed on detection of a recalibration trigger event, such as expiry of a recalibration time interval. The recalibration time interval can be adaptively adjusted based on a magnitude of the thermal drift. Tile images captured since a last recalibration are recaptured if the thermal drift is too great for reliable image compensation. The system ensures seamless assembly of tile images into image photo-mosaics and increases image photo mosaic throughput.
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