Projects

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    Current Projects and Abstracts

    1. Microstructured Optical Fiber for Urban Sensing:

       

      A three-core photonic crystal fiber (PCF) anemometer with fast response times (<30μs) for low wind speed (<30m/s) detection is being developed. The results of this investigation are relevant to urban sensing technologies that involve air quality monitoring. High-resolution anemometers with fast response times are important to environmental monitoring industries as well as basic research investigations of small-scale (<10cm) fluid mechanical phenomena. In anemometry, the main difficulty in selecting anemometers is the system size and reliability. The multicore photonic crystal fiber (PCF) anemometer is compact and lightweight unlike the sonic anemometer making it suitable for <10cm resolution measurements. The featured PCF anemometer offers a sensing resolution comparable to hot wire anemometers in the form of a rugged all-weather device.

    2. This project was supported in part by the Villanova Undergraduate Research Fellowship Program.

    3. Joint Chemical Sensing with Microstructured Optical Fibers:

      The objective of this effort is to develop a microstructured optical fiber based sensor that is compact, lightweight, sensitive and rugged for vehicle interiors, aircraft, individual personnel, shipboard, and fixed site locations. The proposed device will offer an improvement to the performance of current JCAD technology demonstrated by the commercially ChemSentryTM from BAE Systems.

       

    4. Nanostructured Optical Fiber for Biodetection:

      Detectors for measuring chemical quantities that are markers for medical diseases such as acetone detection for diabetes.

    5. Modeling Thermal and Strain Properties of Multicore PCF:

      Models for determining the intercore bending or deflection of multicore optical fibers as well as thermal expansion modeling of inter core spacing in multicore optical fibers will be presented. These models will be employed to predict the detection sensitivities of mulitcore fiber based force meters and thermal detectors. The results of this effort will contribute significantly to the development of optical fiber based anemometers and heat flux detection systems.

    6. Thermal Sensing with Microstructured Optical Fibers:

      A sensing configuration based on commercially available triple-core photonic crystal fibre (PCF) for the image based optical collection of thermal information is presented. Detection of thermal phenomena on the micro and nano scale is important for monitoring thermodynamic processes and cooling mechanisms for the microelectronic packaging industry. The thermal characteristics of the fiber combined with couple mode theory principles are used to construct and simultaneously measure heat flux and temperature with a three core PCF with a 1-D core arrangement for the first time. The PCF sensor demonstrated high detection sensitivity (<1°C) and fast response times (<30μs) which is a significant improvement to current commercial standards.

    Other Projects

    We are currently working on research for a Gas Filling System:

    Gas Filling System Research

    image of gas filling results
    NEED CAPTION
    • HC-PBG fiber (Corning™ PBG-1550) with a transmission window between 1480-nm and 1640-nm with a core diameter 12.5μm
    • Hermetically sealed aluminum housing components with a gas filling or evacuation port
    • PBG fiber butt-coupled to conventional SMF and MMF
    • OSA resolution 0.2nm
    • Butt-coupled fiber ends gap (< 100 μm) to allow gas to enter/exit the hollow-core of the fiber
    • The investigated fiber lengths were 0.3 m, 0.7m, 1 m, 1.9 m and 27 m.

    Results

    image of gas filling results
    NEED CAPTION
    • Fillings times can be <2mins for ~ 2m length of fiber
    • Normalized transmission of 100% C2H2 as a function of time ¨ Line P23 at 1540.01 nm
    • The filling times vary with fiber length, pressure and concentration
    • Spectral signature of 5%C2H2 and 50%CO2 gas mixture for L= 27m
    • The absorption strength of the peaks increased as the gas filled the fiber
    • The fiber was 95% filled in approx. 6hrs 20mins at ΔP=17Psi
    • Absorption strengths for relatively weak CO2 lines are strong for long fiber lengths
    image of gas filling results