Optical differential strain gauge

Details Optical differential strain gauge Optical differential strain gauge

1987-03-30

1988-10-11

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

250231R, 73800, 356 355, G01L 124

Patent

active

047773588

ABSTRACT:
An optical strain gauge has a first birefringent optical module secured to a specimen bar in a manner transferring tensile strain from the bar to the module and has a similar second birefringent module secured to the bar in a manner transferring shear strain from the bar to the module. The two modules are disposed in series in a light path along which polarized light is directed. A polarization rotator is situated in that path between the two modules and causes the phase shift between two polarized components of the light to optically subtract. The optical subtraction arrangement conduces to making the gauge insensitive to environmental effects because stresses imposed by those environmetal effects equally upon both modules result in optical cancellation of the effects of those stresses on the modules. Those two polarized components, after passing through both modules, are separated to obtain a measure of the difference between the transferred tensile strength and the transferred shear strain.

REFERENCES:
patent: 4648274 (1987-03-01), Trainer
patent: 4679933 (1987-07-01), Pindera
patent: 4703918 (1987-11-01), Pindera

Affiliated with

Also associated with

Rating

Optical differential strain gauge does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Optical differential strain gauge, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Optical differential strain gauge will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1959615