P2sup.L2sup. strain monitor measures strain by monitoring change in phase of acoustic signal that passes through stressed sample. Phase sample causes shift in frequency of VCO. As with other monitors of this type, instrument is only accurate in elastic range of material. Monitor is expected to have broad application in materials testing, structural design, fabrication and assembly.
Pulsed Phase-Locked-Loop Strain Monitor
NASA Tech Briefs ; 6 , 1
1982-09-01
Miscellaneous
No indication
English
Double-Referenced, Pulsed, Phase-Locked Loop - DRP2L2
NTRS | 1987
|Differential vector phase locked loop
IEEE | 2016
|