ELECTROMAGNETIC ACOUSTIC TRANSDUCER FOR BOLT TENSION AND LOAD MEASUREMENT

摘要

A device for measuring a load on a part such as a bolt (2), comprises a socket (15) have walls defining an interior space (17) wherein the socket engages the bolt for transmitting a load to the bolt. An electromagnetic acoustic transducer (20) comprising a magnet (28) and a coil (26) is located in the interior space of the socket near the bolt. The coil provides a current while the magnet provides a magnetic field such that the magnet and the coil generate an ultrasonic signal with the bolt. A detector is used to detect and measure a change in the ultrasonic signal at the bolt.