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Fig. 1. Computer controlled centrifugal device equipped with a fibreoptical sensor. (A) Scheme of the device. (B,C) Position of the focused light source (ls, sender) and fibre-optical sensor (fos, receiver) relative to the drum centre with an insect rotating on the horizontal drum surface, viewed from above. cm, motor control; cp, computer; cs, sensor control; dr, drum; pt, Plexiglas plate; rt, rotor of the motor.