Browsing by Author "Udrea, Florin"

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    High Temperature Characterization of a CMOS Based Infra-red Source using Thermal-incandescence Microscopy
    (Solid State Electronics, 2020-01-30) Pandey, Prakash; Oxley, Chris; Hopper, Richard H.; Udrea, Florin; Ali, Syed Zeeshan
    This paper presents the high temperature thermal characterization of a Micro-Electro-Mechanical Systems (MEMS) infra-red (IR) thermal source, using non-contact optical approaches, based on IR and thermo-incandescence microscopy. The IR thermal source was fabricated using a CMOS based processing technology and consists of a miniature micro-heater, fabricated using tungsten metallization. The performance and reliability of the IR source is highly dependent on its operating temperature. For short-wave (1.4 μm - 2.5 μm) infra-red emission, the operating temperature is in excess of 800°C. Work will be presented in this paper in which spot temperature measurements (> 700 °C) were made on the IR source using thermal-incandescence microscopy. Thermal-optical calibration was achieved by utilizing the known melting point (MP) of different metal micro-particles. Optical measurements were compared to those obtained using an electrical approach. The thermal measurements suggest good temperature uniformity across the micro-heater of the IR source.
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    Improved infrared thermal imaging of a CMOS MEMS device.
    (IEEE, 2010) Hopper, Richard; Haneef, Ibraheem; Ali, Syed Zeeshan; Udrea, Florin; Oxley, C. H.
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    Thermo-optical characterization of fluorescent rhodamine B based temperature-sensitive nanosensors using a CMOS MEMS micro-hotplate
    (Elsevier, 2014-03) Chauhan, V. M.; Hopper, R. H.; Ali, S. Z; King, E. M.; Udrea, Florin; Oxley, C. H.; Aylotta, J. W.
    A custom designed microelectromechanical systems (MEMS) micro-hotplate, capable of operating at high temperatures (up to 700 °C), was used to thermo-optically characterize fluorescent temperature-sensitive nanosensors. The nanosensors, 550 nm in diameter, are composed of temperature-sensitive rhodamine B (RhB) fluorophore which was conjugated to an inert silica sol–gel matrix. Temperature-sensitive nanosensors were dispersed and dried across the surface of the MEMS micro-hotplate, which was mounted in the slide holder of a fluorescence confocal microscope. Through electrical control of the MEMS micro-hotplate, temperature induced changes in fluorescence intensity of the nanosensors was measured over a wide temperature range. The fluorescence response of all nanosensors dispersed across the surface of the MEMS device was found to decrease in an exponential manner by 94%, when the temperature was increased from 25 °C to 145 °C. The fluorescence response of all dispersed nanosensors across the whole surface of the MEMS device and individual nanosensors, using line profile analysis, were not statistically different (p < 0.05). The MEMS device used for this study could prove to be a reliable, low cost, low power and high temperature micro-hotplate for the thermo-optical characterisation of sub-micron sized particles. The temperature-sensitive nanosensors could find potential application in the measurement of temperature in biological and micro-electrical systems.
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    Use of carbon micro-particles for improved infrared temperature measurement of CMOS MEMS devices.
    (IOP, 2010-04) Hopper, Richard; Haneef, Ibraheem; Ali, Syed Zeeshan; Udrea, Florin; Oxley, C. H.
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    Use of Carbon Micro-particles for improved IR surface temperature measurements of CMOS MEMs Devices
    (2010-04) Haneel, I.; Udrea, Florin; Oxley, C. H.; Hopper, R. H.; Ali, S.