Share Email Print

Optical Engineering

Particle sizing by photon correlation laser Doppler anemometer in the submicron/nanometer size range
Format Member Price Non-Member Price
PDF $20.00 $25.00
cover GOOD NEWS! Your organization subscribes to the SPIE Digital Library. You may be able to download this paper for free. Check Access

Paper Abstract

A particle sizing algorithm is developed for nanoparticle sizing with laser Doppler anemometry/velocimetry systems. A model-based signal processing method is used to estimate the particle size from the autocorrelation curve corresponding to a single particle transit. Two kinds of figures of merit functions are combined to improve the sensitivity. The optimal setup parameters (refractive index, wavelength, and observation direction) and trajectory error are investigated in independent simulation studies. At 514-nm illumination wavelength, the most sensitive size region is found below 300 nm down to the sizing limit (20 photons on average from a single particle transit). The required laser power is searched for by the lower sizing limit based on the calibration measurement. The size estimation of a polystyrene sphere particle of 50 nm diameter requires at least 123-kW/cm2 laser power density at 350 nm, while 587 kW/cm2 at 514 nm is used in the studied system.

Paper Details

Date Published: 1 January 2010
PDF: 8 pages
Opt. Eng. 49(1) 013602 doi: 10.1117/1.3292002
Published in: Optical Engineering Volume 49, Issue 1
Show Author Affiliations
Lénárd Vámos, Research Institute for Solid State Physics and Optics (Hungary)
Péter J. Jani, Research Institute for Solid State Physics and Optics (Hungary)

© SPIE. Terms of Use
Back to Top