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A New Tool for IndustryUltrasonic P2L2 bolt monitor is a new industrial tool, developed at Langley Research Laboratory, which is lightweight, portable, extremely accurate because it is not subject to friction error, and it is cost-competitive with the least expensive of other types of accurate strain monitors. P2L2 is an acronym for Pulse Phase Locked Loop. The ultrasound system which measures the stress that occurs when a bolt becomes elongated in the process of tightening, transmits sound waves to the bolt being fastened and receives a return signal indicating changes in bolt stress. Results are translated into a digital reading of the actual stress on the bolt. Device monitors the bolt tensioning process on mine roof bolts that provide increased safety within the mine. Also has utility in industrial applications.
Document ID
20030005017
Acquisition Source
Langley Research Center
Document Type
Other
Date Acquired
August 21, 2013
Publication Date
January 1, 1981
Publication Information
Publication: Spinoff 1981
Subject Category
Structural Mechanics
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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