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Differential interferometer for tachometric movement measurement, has frequency multipliers placed at start and end of measurement distance covered by laser beams to cause phase shift between beams whose variation follows light speed
Differential interferometer for tachometric movement measurement, has frequency multipliers placed at start and end of measurement distance covered by laser beams to cause phase shift between beams whose variation follows light speed
The interferometer has a semi-reflecting prism (2) which divides light beam emitted by a laser (1) into two secondary beams. The beams cross frequency multipliers (4, 5) that are arranged at start and end of measurement distance covered by respective beams, to cause a phase shift between the beams whose variation directly follows the light speed. The shift is proportional to linear speed of displacement in Sagnac reference frame.
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