MIT 2 717 - Heterodyning (8 pages)

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Heterodyning



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Heterodyning

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Lecture Notes


Pages:
8
School:
Massachusetts Institute of Technology
Course:
2 717 -

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Heterodyning frequency f1 frequency f2 in phase MIT 2 717 03 28 05 wk8 a 1 not to scale slightly out of phase more out of phase envelope beat difference frequency oscillation 1MHz detectable by electronics sum frequency oscillation 1015Hz too fast for detector Principle of heterodyne interferometer reference retro reflector fixed f2 f1 f2 f1 movable retro reflector f1 f2 polarizer detector phase comparator MIT 2 717 03 28 05 wk8 a 2 relative position velocity information output Difference frequency generation orthogonally polarized polarizer f1 f2 45 wrt both f1 f2 f1 f2 both parallel polarized at 45 detector can follow beat frequency only MIT 2 717 03 28 05 wk8 a 3 polarization of field f1 polarizer direction polarization of field f2 f1 f2 Principle of heterodyne interferometer reference retro reflector fixed f2 f1 f2 f1 movable retro reflector f1 f2 polarizer detector f1 f2 MIT 2 717 03 28 05 wk8 a 4 phase comparator relative position velocity information output Splitting the two frequencies reference retro reflector fixed f2 f2 polarized f1 polarized polarizing beam splitter reflects polarization transmits polarization MIT 2 717 03 28 05 wk8 a 5 f1 movable retro reflector Mapping position and velocity reference retro reflector fixed f2 f2 f1 movable retro reflector f2 f1 f1 f1 f1 polarizing beam splitter reflects polarization transmits polarization MIT 2 717 03 28 05 wk8 a 6 field is Doppler shifted and phase delayed Principle of heterodyne interferometer reference retro reflector fixed f2 f1 f2 f1 f2 polarizer detector f1 f2 MIT 2 717 03 28 05 wk8 a 7 f2 f1 f1 f1 movable retro reflector f1 f1 f1 f1 f2 phase comparator relative position velocity information output Position measurement principle beat phase position beat frequency f1 f2 MIT 2 717 03 28 05 wk8 a 8



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