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6 Answers, Hints and Solutions 223
2,200

a=60
Rotation rate (rpm) 1,400 45
1,800

1,000 30
2 4 6 8 10 12 14
Slope number
Fig. A.13. Rotation rate and number of slopes of the cylindrical rotor with slope
angle of a =30 , 45 ,and 60 ◦
◦
◦
A4.5 See Fig. A.14. Optical mixer rotates due to the torque exerted on the
slope upon parallel beam illumination, makingthe objective lens unnecessary.

Laser

Paddle
Slope

Rotation
Fig. A.14. Optical mixer suitable for used in a microchannel of future µ-TAS