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Unformatted text preview: sin(ωt+2πx/λ +) = Elight source(x,t) L
L+ΔL/2 + = ΔL/
2 ? ΔL Screen: Destructive interference Moving mirror: What do you see? Esum(x,t) = ½ · E0 sin(ωt+2πx/λ +) + ½ · E0 sin(ωt+2π(x+Δx)/λ +)
= ½ · E0 sin(ωt+2πx/λ +) - ½ · E0 sin(ωt+2πx/λ +) = 0 Light source if Δx = λ / 2:
sin(x+π) = - sin(x) + = ? Screen: Tilted mirror: What do you see?
Screen Intensity λ/
2 ΔL Interference in daily life: Light source Screen 4 Do you want a bigger ‘interferometer’? There you go… Gravitational wave detectors Blue iridescence in animals? Summary for Interferometers The blue color and iridescence originate from constructive
interference of blue light and destructive interference of all other
colors. Michelson interferometers allow us to measure tiny
displacements. Displacements of less than 100 nm are
made visible to the eye!
Interferometers find many applications in precision
metrology such as for displacement, distance and
mechanical stress measurements, as well as flatness
Interferometers have played an important role in
Michelson-Morley experiment special relativity
Testing general relativity: Gravitational wave detection
Global survey of groundwater (GRACE satellites) 5...
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- Spring '14