Rotating polarizer angle sensing system

Details Rotating polarizer angle sensing system Rotating polarizer angle sensing system

1986-05-15

1987-08-25

Willis, Davis L.

Optics: measuring and testing

Material strain analysis

With polarized light

250225, 250231SE, 356364, G01B 1116

Patent

active

046889345

ABSTRACT:
A system for measuring aeroelastic deformation of an aircraft wing in flight or in a wind tunnel utilizing light from a linearly polarized light source (101). The light is transmitted through modulating elements (104, 105) to provide a carrier beam, and a small portion of the beam is reflected through a linear polarizer (107) into a photo-detector (108) for utilization as a reference electrical signal (208). The remainder of the beam is reflected back from a retro-reflector target (700) located on the wing into another photo-detector (114) to provide the target electrical signal (209). The two amplified electrical signals are compared in a phase detector (FIG. 3) for providing an angle measurement output signal E.sub.0.

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