NANOPARTICLE SIZING METHOD USING THE FREQUENCY DISTRIBUTION CURVE OF PROBE BEAM DEFLECTION SIGNAL MAGNITUDE GENERATED BY LASER-INDUCED BREAKDOWN

摘要

PURPOSE: A method for measuring the size of a nano-particle is provided to obtain a normal distribution curve with a Gaussian function shape which is related to the data of a measured probe-beam deflection signal magnitude. CONSTITUTION: A sample cell(10) generates a laser-induced plasma by radiating pulsed laser beam(1') to a Z-axis direction. Probe beam(13') is radiated to a Y-axis direction. The signal of the probe beam is measured by a photo diode(19). The focus location of the pulsed laser beam is adjusted for overlapping two signals which is reached to the probe beam. A symmetrical frequency distribution of the probe beam signal magnitude is obtained by a gate integrator(22).