Benjamin R. Anderson

Fungus Covered Insulator Materials Studied with Laser-Induced Fluorescence and Principal Component Analysis

A method combining laser-induced fluorescence and principal component analysis to detect and discriminate between algal and fungal growth on insulator materials has been studied. Eight fungal cultures and four insulator materials have been analyzed. Multivariate classifications were utilized to characterize the insulator material, and fungal growth could readily be distinguished from a clean surface. The results of the principal component analyses make it possible to distinguish between algae infected, fungi infected, and clean silicone rubber materials. The experiments were performed in the laboratory using a fiber-optic fluorosensor that consisted of a nitrogen laser and an optical multi-channel analyzer system.

Generalizing the correlated chromophore domain model of reversible photodegradation to include the effects of an applied electric field.

All observations of photodegradation and self-healing follow the predictions of the correlated chromophore domain model [Ramini et al., Polym. Chem. 4, 4948 (2013)]. In the present work, we generalize the domain model to describe the effects of an electric field by including induced dipole interactions between molecules in a domain by means of a self-consistent field approach. This electric field correction is added to the statistical mechanical model to calculate the distribution of domains that are central to healing. Also included in the model are the dynamics due to the formation of an irreversibly damaged species, which we propose involves damage to the polymer mediated through energy transfer from a dopant molecule after absorbing a photon. As in previous studies, the model with one-dimensional domains best explains all experimental data of the population as a function of time, temperature, intensity, concentration, and now applied electric field. Though the precise nature of a domain is yet to be determined, the fact that only one-dimensional domain models are consistent with observations suggests that they might be made of correlated dye molecules along polymer chains. Furthermore, the voltage-dependent measurements suggest that the largest polarizability axis of the molecules are oriented perpendicular to the chain.

Random lasing and reversible photodegradation in disperse orange 11 dye-doped PMMA with dispersed ZrO2 nanoparticles

We report the observation of intensity feedback random lasing at 645 nm in Disperse Orange 11 dye-doped PMMA (DO11/PMMA) with dispersed ZrO

Effect of experimental parameters on optimal transmission of light through opaque media

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Microgenetic optimization algorithm for optimal wavefront shaping

nanoparticles (NPs). The lasing threshold is found to increase with concentration, with the lasing threshold for 0.1 wt\% being

A White Light Interferometric Microscope for Measuring Dose-Dependent Reversible Photodegradation

75.8 \pm 9.4

Development of a tool for remote detection of fungi and algae on electrical insulators using laser induced fluorescence combined with principal component analysis

MW/cm

Effect of experimental parameters on optimal reflection of light from opaque media

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Stability of optimal-wave-front-sample coupling under sample translation and rotation

and the lasing threshold for 0.5 wt\% being

Nanoscale Ex Situ Thermal Impulse Sensors for Structural Fire Forensics

121.1 \pm 2.1