A5102000722- Advanced Fiber Optic Sensors
- Anodic Oxide Films and Nanostructures
- Semiconductor Lasers and Optical Devices
- Photonic and Optical Devices
- Nanopore and Nanochannel Transport Studies
- Ion-surface interactions and analysis
- Nanoporous metals and alloys
- Integrated Circuits and Semiconductor Failure Analysis
- Photonic Crystal and Fiber Optics
- Electronic and Structural Properties of Oxides
- Advanced Measurement and Detection Methods
- Supercapacitor Materials and Fabrication
- Optical measurement and interference techniques
- Adhesion, Friction, and Surface Interactions
- Ferroelectric and Piezoelectric Materials
- Advanced Condensed Matter Physics
- Ga2O3 and related materials
- Advanced Sensor Technologies Research
- Multiferroics and related materials
- Corrosion Behavior and Inhibition
- Surface Roughness and Optical Measurements
- Advanced Measurement and Metrology Techniques
- TiO2 Photocatalysis and Solar Cells
- Mechanical and Optical Resonators
- Semiconductor materials and devices
Virginia Tech
2010-2017
Magnetoelectric composite thin films hold substantial promise for applications in novel multifunctional devices. However, there are presently shortcomings both the extensively studied bilayer epitaxial (2-2) and vertically architectured nanocomposite (1-3) film systems, restricting their applications. Here we design a growth strategy to fabricate an heterostructure with magnetic quasiparticles (0) embedded ferroelectric matrix (3) by alternately growing layers within film. The new...
A sourceless sapphire fiber extrinsic Fabry-Perot interferometer for ultrahigh temperature sensing is developed. wafer mounted on the tip of a as cavity. The interference signal generated by thermal radiation that transmits through and guided to spectrometer then silica fiber. entire sensor system compact low cost. was experimentally tested up 1593°C, resolution around 1°C achieved.
Focused ion beam patterning is a powerful technique for guiding the growth of ordered hexagonal porous anodic alumina. This study shows that, with guidance focused patterning, alumina interpore distances from 200 to 425 nm can be fabricated at 140 V in 0.3 M phosphoric acid. When distance increased 500 nm, alternating diameter nanopore arrays are synthesized creation and new small pores junctions three large neighboring pores. Moreover, arrangement by guided anodization. Interpore an...
The fabrication of ordered porous templates in large areas with sophisticated patterns beyond mono-sized pores hexagonal packing remains a great technical challenge. Conventional anodization cannot overcome this limitation and new approach needs to be sought. This study is focused on designing pore square arrangements via ion beam lithography varying interpore distances order form organized arrays more patterns. results demonstrate that the small from can meshed larger unique, complicated...
Anti-Stokes Raman scattering in sapphire fiber has been observed for the first time. Temperature dependence of peaks' intensity, frequency shift, and linewidth were also measured. Three anti-Stokes peaks at temperatures higher than 300°C a 0.72-m-long excited by second-harmonic Nd YAG laser. The intensity are comparable to that Stokes when temperature increases 1033°C. We foresee combination measurement use as mechanism ultrahigh sensing.
Anodic TiO2 nanotube arrays possess exciting application potentials in solar cells and photocatalysis. However, self-organized anodization alone can only produce randomly arranged nanotubes. In this study, focused ion beam (FIB) guided is used to create highly ordered with different intertube distances tube arrangements. On the one hand, FIB patterning greatly enhances organization of nanotubes for classic hexagonal close packing. other fundamentally arrangements, such as square, oblique...
Multilayers of dielectric oxide coated at the end sapphire fiber act as Fabry-Perot interferometer, and high-temperature sensing elements are proposed demonstrated. Broadband tungsten halogen lamp is used to generate interferometric fringes from which temperature-dependent optical thickness change coatings can be accurately determined. Experimental investigation shows that sensor exhibits a temperature responsibility 40.7 pm/°C when ambient changes 400 °C 1000 °C. The proved simple in...
In this Letter, we present the design of a simple signal interrogator for optical fiber-based white light Fabry-Perot (F-P) interferometers. With hardware being composed only flat fused silica wafer and CCD camera, translates spectral interference into spatial pattern, then demodulates F-P cavity length with use relatively demodulation algorithm. The concept is demonstrated experimentally in fiber optic sensor sapphire as cavity.
A fiber optic high-temperature sensor with a low-fineness Fabry-Perot cavity formed by dielectric films on sapphire tip is proposed and demonstrated. Experimental investigation shows that the exhibits sensitivity of 40.7pm/℃ when ambient temperature changes from 400℃ to 1000℃.
This article introduces an approach for modeling the fiber optic low-finesse extrinsic Fabry-Pérot Interferometers (EFPI), aiming to address signal processing problems in EFPI demodulation algorithms based on white light interferometry. The main goal is seek physical interpretations correlate sensor spectrum with interferometer geometry (most importantly, optical path difference). Because quality and reliability hinge heavily understanding of such relationships, model sheds optimizing performance.
This paper reports a miniaturized fiber optic (FO) sensor developed using microfabrication technology. In this device, the temperature and pressure measurements are incorporated into single point tip sensor. The temperature-pressure cross sensing issue, common problem in air gap sensors, is addressed by self-calibrating with integrated element approximately 300 μm. Signal demodulation was based on an optical white light interferometry algorithm.
It is well known that using a single-mode lead-in fiber, multi-mode fiber section as Fabry-Perot cavity, and an additional the tail results in structure generates strong interference fringes while remaining robust. Due to their compact size, sensitivity, ability be multiplexed, intrinsic interferometers (IFPIs) are excellent candidates for almost any multi-point temperature or strain application. Four of these sensors were installed on 2"x2" coupon installation simulated gas turbine...