Idea of Metrology Su-Jin Kim 2012.

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Presentation transcript:

Idea of Metrology Su-Jin Kim 2012

Energy of light E =h c/λ = h f Laser sorce: He-Ne laser, Laser diode

Laser mirror detector Security, Count N people passing a door, Part exist or not Machine tool workpiece size and coordinate Milling tool length, diameter, wear Protect worker from press machine (safety)

Velocity of light c = 3x108 m/s CPU: f=3GHz  Resolution = c(m/s) / f(/s) = 0.1 m Not accurate. Long distance (Earth to moon by high power laser) Sound wave v = 300 m/s CPU: f=3GHz  Resolution = v(m/s) / f(/s) = 1 μm Fishing, depth of ocean, Seed in metal is very fast. Ultra sound is used to know inside of earth. x

Triangle method a l b x, y , z

Interfere Laser is electro magnetic wave with single wave length. Wave length of laser light: λ=1μm f = c / λ = 3x108 m/s / 10-6 m = 3x1014 Hz Resolution: 0.5μm ~ 0.05μm

Angle Encoder: Scale is printed on the glass Light pass and stop at each scale grid. Encoder is used for the feedback servo motor rotated angle.