Deep hole machining technology has been widely applied in the manufacturing industry.Due to the limited internal space of deep holes,there are difficulties in detecting them.In recent years,optical detection methods have received attention,promoting the development of deep hole detection technology from traditional manual detection to optical detec-tion.This article elaborates on the existing deep hole measurement tools and their existing problems,summarizes the meas-urement principles,research progress,and advantages and disadvantages of existing optical measurement methods,and pro-poses unresolved issues in research.Finally,it prospects the future development of deep hole detection methods.
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