The phase-shifting method which is used in ESSPI can improve the precision of the measurement greatly. So the phase-shifting method is used in Non Destructive Testing widely.
而在ESSPI的定量测量中应用相移技术，可以使测量精度大为提高，因此被广泛用于无损检测领域。
The phase-shifting method which is used in ESSPI can improve the precision of the measurement greatly. So the phase-shifting method is used in Non Destructive Testing widely.
而在ESSPI的定量测量中应用相移技术，可以使测量精度大为提高，因此被广泛用于无损检测领域。
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