How to the elongation of the fastener that is run by the power tool is measured by ultrasound and power tool

摘要

The present invention relates to a power tool was set to perform the method and the method for measuring the elongation of the fastener by the main minimum peak side lobe (MPS) coded ultrasonic signal. MPS coded signal having a different fundamental frequency is transmitted to the fastener (101), and a set of reflected signals corresponding the fastener is received (102). Each reflected items has is transmitted primarily cross-correlated with the ultrasonic signals corresponding to (103), and the quality attributes of the main signals each transmitted from the cross-correlation signal is determined (104). based on quality feature, at least one parameter of the ultrasonic measuring signals are determined (105), and an ultrasonic measurement signals transmitted to the fastener (106), and receives the ultrasonic measurement signals reflected (107) is measured by is done.FIELD 1