NASA NTRS · 19930063019
A microprocessor based portable bolt tension monitor
Abstract
A bolt tension monitor (BTM) which uses ultrasonics and a pulsed phase locked loop circuit to measure load-induced acoustic phase shifts which are independent of friction is described. The BTM makes it possible to measure the load in a bolt that was tightened at some time in the past. This capability to recertify a load after-the-fact will help to insure the integrity of a bolted joint.
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Perey, D. F.. 1991-05-01. A microprocessor based portable bolt tension monitor. https://ntrs.nasa.gov/citations/19930063019
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