Interferometer - How We Measure Tiny Physical Changes [video]
Naval Postgraduate School Physics
MetadataShow full item record
A Fiber Optic Interferometer is a highly coherent laser light that's launched into a single mode optical fiber and then split equally into two paths to form the two legs of an interferometer. One leg of the fiber is wound around a piezoelectric cylinder while the other leg lies on the table. A voltage is applied to the piezoelectric cylinder to excite it into radial vibrations. The light passing through the leg on the cylinder travels different distances as the cylinder vibrates. When the light from two legs is recombined, the intensity of the combined light measured by a photodetector changes rapidly. Very small path length differences are detected by constructive and destructive interference as the light in the two paths changes phase relative to each other.
NPS PhysicsPhysics Demonstrations
Showing items related by title, author, creator and subject.
Geöktun, Selâahattin (Monterey, California. Naval Postgraduate School, 1975-12);Surface pressure, drag and lift coefficients have been experimentally determined for a right circular cylinder located near a plane surface and placed in a cross flow of air. Parametric studies were carried out for ...
Sarpkaya, Turgut (Society of Petroleum Engineers of AIME, 1979-02);The evolution of forces acting on horizontal cylinders subjected to impact by a sinusoidally oscillating free surface was investigated both theoretically and experimentally. The experiments were conducted in a large ...
Köseman, Ender (Monterey, California. Naval Postgraduate School, 1975-12);Local and average Nusselt numbers have been experimentally determined around the circumference of a uniformly heated right circular cylinder placed near a plane surface in a cross flow of air. Experiments were carried out ...