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Philip Colosimo

Senior Engineer

Email

pcolosimo@apl.washington.edu

Department Affiliation

Ocean Engineering

Education

B.S. Physics and English, University of Michigan-Ann Arbor, 1998

Ph.D. Physics, SUNY-Stony Brook, 2007

Publications

2000-present and while at APL-UW

On sensing nitro-group containing compounds using thin planar arrays of titanium dioxide nanowires

Asher, W.E., P. Colosimo, E.I. Thorsos, and A. Yao, "On sensing nitro-group containing compounds using thin planar arrays of titanium dioxide nanowires," IEEE Sens. J., 18, 6927-6936, doi:10.1109/JSEN.2018.2855110, 2018.

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1 Sep 2018

Previous laboratory results have suggested that unheated TiO2 nanowire arrays provide a means to detect trace level concentrations of nitro-group containing compounds in the gas phase with fast response and high chemical selectivity. The detection method is based on the chemiresistive effect, where an electron-deficient compound adsorbed to the surface of an n-type semiconductor causes a surface charge deficit on the semiconductor leading to an increase in its resistance. However, a major issue with this method is that chemiresistive sensors based on TiO2 are also sensitive to the presence of water vapor, and this cross-sensitivity could lead to artifacts for sensors used under environmental conditions. Results are presented here, where thin planar arrays of TiO2 nanowires were tested to determine the sensitivity towards water vapor, along with the detection limits and response times towards several nitrocontaining organic molecules as a function of gas-phase water vapor concentration. When water vapor concentrations were carefully controlled to ensure they remain constant throughout the testing cycle, it was found that TiO2 nanowire devices could detect 2,4,6-trinitrotoluene at a concentration as low as a few tens of part per trillion by volume with a response time in the range of 102 – 103 s, depending on experimental conditions.

Sensing RF and microwave energy with fiber Bragg grating heating via soft ferromagnetic glass-coated microwires

Colosimo, P., A. Chen, J. Devkota, H. Srikanth, and M.-H. Phan, "Sensing RF and microwave energy with fiber Bragg grating heating via soft ferromagnetic glass-coated microwires," Sensor Actuat. A-Phys., 210, 25-31, doi:10.1016/j.sna.2014.01.038, 2014.

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1 Apr 2014

We present results from a fiber Bragg grating-based microwave energy sensor. The sensor relies on a soft ferromagnetic glass-coated microwire that is bonded to the cladding of the grating. The microwire absorbs microwave energy and heats up thus raising the temperature of the fiber Bragg grating. Compared to a similar sensor that uses gold to absorb electromagnetic radiation, the microwire yields a sensor with greater sensitivity (~10 times at f = 3.25 GHz) relative to the perturbation of the microwave field. With the sensor reported here, the best sensitivity to electromagnetic radiation corresponds to AC electric fields that have an an average electric energy density of approximately 1.3 mJ/m3.

Tailoring magnetic and microwave absorption properties of glass-coated soft ferromagnetic amorphous microwires for microwave energy sensing

Devkota, J., P. Colosimo, A. Chen, V.S. Larin, H. Srikanth, and M.H. Phan, "Tailoring magnetic and microwave absorption properties of glass-coated soft ferromagnetic amorphous microwires for microwave energy sensing," J. Appl. Phys., 115, 17A525, doi:10.1063/1.4868329, 2014.

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13 Mar 2014

A comparative study of the magnetic softness, giant magnetoimpedance (GMI) effect, and microwave absorption capacity of glass-coated amorphous Co64.63Fe4.97B16Si11Cr3.4Ni0.02 and Co68B15Si10Mn7 microwires has been performed. We find that the Mn-containing sample exhibits a softer magnetic property, a larger GMI ratio, and a higher microwave absorption capacity as compared to those with a Fe-Cr-Ni composition. As a result, the Mn-containing microwire is shown to be a better microwave absorber for fabrication of a new class of microwave energy sensor based on Fiber Bragg Grating. Our study emphasizes a correlation between the magnetic softness, GMI, and microwave absorption in the microwires and paves the way to improving the performance of such sensors by tailoring their soft magnetic properties.

Inventions

Fiber-optic, Distributed Pressure Sensor

Record of Invention Number: 45350

Philip Colosimo

Disclosure

19 Aug 2010

Acoustics Air-Sea Interaction & Remote Sensing Center for Environmental & Information Systems Center for Industrial & Medical Ultrasound Electronic & Photonic Systems Ocean Engineering Ocean Physics Polar Science Center
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