The Development of a Displacement Interferometer for Model Deflection Measurements
Final rept. Jul 1974-Jun 1976
ARNOLD ENGINEERING DEVELOPMENT CENTER ARNOLD AFB TN
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A two-beam laser interferometric device capable of continuously measuring either absolute or differential displacement both steady state and time variant with a resolution to one-quarter of the laser wavelength is described. This device is proposed for measurement of model attitude and deflection in wind tunnel applications. Experiments are presented demonstrating its accuracy, versatility, and online readout capabilities. A conceptual multibeam device to extend the present device for simultaneous measurement of pitch, roll, twist, and deflection is also discussed.
- Test Facilities, Equipment and Methods