Affiliation:
1. South China Normal University
2. South China Normal University Qingyuan Institute of Science and Technology Innovation
Abstract
Recently, image methods for measuring dynamics of nanoparticles have garnered
attention; however, the low-speed frame rate of normal image sensors
limits their application. Applying a low-speed detector can extract
fast dynamic information by the method of an exposure time-dependent
spectrum, whereas its accuracy is too sensitive to the wave vector
range selection. In this paper, we present a criterion to determine
the wave vector range for the image method of heterodyne near-field
light scattering, where the hologram of the particles is analyzed to
extract the particle dynamics. A normalized instrument factor ratio
𝓇
(
q
)
is defined, and the accuracy of
results can be guaranteed when the upper limit
q
up
is selected at the maximum of
𝓇
(
q
up
)
=
1
, and the lower limit
q
low
is selected according to the optimal
goodness of fit
R
2
. The experimental results verify the
effectiveness of the proposed criterion. Since most image methods for
nanoparticle characterizing are related to the wave vector range
selection, it is believed that the idea of this criterion can be
extended generally.
Funder
National Natural Science Foundation of China
Natural Science Foundation of Guangdong Province
Science and Technology Program of Guangzhou
Subject
Atomic and Molecular Physics, and Optics,Engineering (miscellaneous),Electrical and Electronic Engineering