In order to measure the common taper of benchmark blades in helicopter, we put forward an optical common taper measurement based on CPLD. Using three groups of laser paths to lock a laser plane, the three pieces of primary standard rotor blade could cut the laser path, and we can calculate taper parameters of the primary standard rotor blade by measuring time-domain pulse signals and time-sequence algorithm programs. The results show that this method satisfies the measurement standard, and the uncertainty is less than 5 mm.
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