Keywords:Mode-matched thermal lens Metallic-dye nanocluster Thermal diffusivity a b s t r a c t Dual beam mode-matched thermal lens method has been employed to measure the heat diffusion in nanofluid of silver with various volumes of rhodamine 6G, both dispersed in water. The important observation is an indication of temperature dependent diffusivity and that the overall heat diffusion is slower in the chemically prepared Ag sol compared to that of water. The experimental results can be explained assuming that Brownian motion is the main mechanism of heat transfer under the present experimental conditions. Light induced aggregation of the nanoparticles can also result in an anomalous diffusion behavior.
Ammonia
is one of the most toxic gases present in our environment,
and its presence in the atmosphere is very unpleasant since its higher
concentration in blood causes the coma and convulsion. Hence, in light
of advance photonics technology, we report a contemporary approach
to design and develop hypersensitive ammonia gas sensor realizing
Mach–Zehnder interferometer (MZI) by a single mode fiber (SMF)-photonic
crystal fiber (PCF)-SMF fiber optic substrate for realizing the interference
by immobilizing PANI@SnO2 nanocomposite to achieve sensing.
In this case, excitation of core and cladding modes of PCF is achieved
using collapse region that is formed at the junction of SMF and PCF
specialty fiber. The method claimed to have very fast response and
recovery times of 7 and 2 s, respectively, which can detect as low
as 8.09 ppt (47.59 fM). The reusable probe shows the potential for
rapid detection of ultratrace ammonia with high selectivity and reproducible
features, thereby opening a new window for environmental monitoring
and online measurements.
.
Significance:
Mueller matrix (MM) polarimetry is a promising tool for the detection of skin cancer. Polarimetric
in vivo
measurements often suffer from misalignment of the polarimetric images due to motion, which can lead to false results.
Aim:
We aim to provide an easy-to-implement polarimetric image data registration method to ensure proper image alignment.
Approach:
A feature-based image registration is implemented for an MM polarimeter for phantom and
in vivo
human skin measurements.
Results:
We show that the keypoint-based registration of polarimetric images is necessary for
in vivo
skin polarimetry to ensure reliable results. Further, we deliver an efficient semiautomated method for the registration of polarimetric images.
Conclusions:
Image registration for
in vivo
polarimetry of human skin is required for improved diagnostics and can be efficiently enhanced with a keypoint-based approach.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.