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The
use of lasers to measure vibrations is another advanced
technology that Celestion has pioneered in speaker design.
The technique is so effective because it doesn't touch
(and therefore influence or damage) the test object at
all.
The
laser beam scans the surface of the vibrating object
and measures the velocity of each point on the scan,
using the Doppler principle. The overall effect, with
the use of moving computer graphics, is like a dynamic
microscope that allows engineers to see and analyse
movements invisible to the naked eye. This is illustrated
in the laserplots above.
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