Title :
Laser Interferometer for High Sensitivity Measurements on Transient Phase Objects
Author_Institution :
German-French Research Institute Saint-Louis, France
fDate :
3/1/1972 12:00:00 AM
Abstract :
A He-Ne laser beam is sent through a common path differential interferometer and the interference signal is detected by a p-i-n photodiode. Weak phase objects can be examined because optical path changes can be resolved to 0.1 Ã… with a time resolution of about 20 ns. Examples for different gas-dynamic investigations show good results and demonstrate the wide field of application for this type of laser interferometer.
Keywords :
Image motion analysis; Laser beams; Optical films; Optical interferometry; Optical sensors; Phase measurement; Photodiodes; Signal resolution; Spatial resolution; Testing;
Journal_Title :
Aerospace and Electronic Systems, IEEE Transactions on
DOI :
10.1109/TAES.1972.309488
