We found a match
Your institution may have access to this item. Find your institution then sign in to continue.
- Title
Particle sizing by photon correlation laser Doppler anemometer in the submicron/nanometer size range.
- Authors
Va´mos, Le´na´rd; Jani, Pe´ter
- 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-nmillumination wavelength, the most sensitive size region is found below 300 nmdown 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 nmdiameter requires at least 123-kWcm2laser power density at 350 nm, while 587 kWcm2at 514 nmis used in the studied system.
- Subjects
PARTICLE size distribution; NANOPARTICLES; PHOTONS; LASER Doppler velocimeter; POLYSTYRENE; ALGORITHMS; SIMULATION methods &; models; AUTOCORRELATION (Statistics)
- Publication
Optical Engineering, 2010, Vol 49, Issue 1, p013602
- ISSN
0091-3286
- Publication type
Article
- DOI
10.1117/1.3292002