25
Intensity signal is observed at
different time shi s, tau. Particles
move differently based on their size,
and will induce a different shaped
ACF decay. From this decay function
we can determine D, the diffusion
coefficient, and therefore the particle
size, r
H
(see Page 21).
Time
Time
Time τ
Time τ
Correlation
g
2
Correlation
g
2
Correlation
g
2
Correlation
g
2
Intensity
Intensity
Large
Particle
Small
Particle
Time τ [log-scale]
Time τ [log-scale]
Autocorrelation Function
DLS evaluates intensity fluctuations via the autocorrelation function
0 1 2
0 1 2
