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IEEE sensors

作者： Kirit Chatterjee Hung Lam Ryan Robucci Govind Rao Yordan Kostov Departement of Computer Science and Electrical Engineering University of Maryland Baltimore County 1000 Hilltop Circle Baltimore MD 21250 Center for Advanced Sensor Technology and Department of Chemical Biochemical and Environmental Engineering University of Maryland Baltimore County 1000 Hilltop Circle Baltimore MD 21250

ISBN: (纸本)9781467346412

A remotely-measured fluorescence-based temperature measurement system designed for neonatal care is built and presented using a low-cost, off-the-shelf camera-phone image sensor. The fluorophore-based sensor salve removes the need of attaching thermistor probes using adhesives to the neonate's skin;and therefore reduces the risk of epidermal stripping, microbial infections, etc. The system performs low-cost yet precise remote ratiometric measurements of our thermometric fluorescent salve using only a 10-bit, 120-FPS CMOS imager. An FPGA handles control and capture of image data in the region of interest with frames synchronized with a pulsing illuminator. A minimalistic algorithm using basic pixel-summations and division to compute a ratio is presented, suitable for implementation on a minimal embedded system. The resolution of the system is reported to be at least 0.18 degrees Celcius.

关键词： temperature measurement system Ointments Newborn Infant image data region of interest temperature sensing adhesives Ratiometric Measurement

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Safe and rapid monitoring of transcutaneous gases using a novel non-equilibrium approach

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Journal of Medical Devices, Transactions of the ASME 2012年第1期6卷 1-1页

作者： Chatterjee, Madkubanti Ge, Xudong Kostov, Yordan Rao, Govind Center for Advanced Sensor Technology(CAST) Department of Chemical and Biochemical Engineering University of Maryland Baltimore Comity United States

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Plasmonic photothermal therapy of thyroid cancer cells with gold nanorods using thermal image monitoring

Plasmonic photothermal therapy of thyroid cancer cells with ...

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2012 17th Opto-Electronics and Communications Conference, OECC 2012

作者： Jang, Chi Woong Arai, Yoshie An, Ji A. Jung, Hyun Jang, Wonhee Jhon, Young Min Dept. of Life Science Dongguk University Seoul 100-715 Korea Republic of Advanced Functional Nanohybrid Material Laboratory Dept. of Chemistry Dongguk University Seoul 100-715 Korea Republic of Sensor System Research Center Korea Institute of Science and Technology Seoul 136-791 Korea Republic of

Thermal images were observed while irradiating a laser beam on thyroid cancer cells treated with gold nanorods submerged in phosphate buffered saline. Cancer cells were found to be dead only in the irradiation area. &... 详细信息

ISBN: (纸本)9781467309776

关键词： Cancer cells

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Plasmonic photothermal therapy of thyroid cancer cells with gold nanorods using thermal image monitoring

Plasmonic photothermal therapy of thyroid cancer cells with ...

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OptoElectronics and Communications Conference, OECC

作者： Chi Woong Jang Yoshie Arai Ji A An Hyun Jung Wonhee Jang Young Min Jhon Sensor System Research Center Korea Institute of Science and Technology Seoul South Korea Department of Life Science Dongguk University Seoul South Korea Advanced Functional Nanohybrid Material Laboratory Department of Chemistry Dongguk University Seoul South Korea

关键词： Cancer Gold Measurement by laser beam Radiation effects Medical treatment Laser beams Temperature measurement

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Optimum Design of Quenching Capacitor Integrated Silicon Photomultipliers for TOF-PET Application

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Physics Procedia 2012年 37卷 1511-1517页

作者： Gyuseong Cho Hyoungtaek Kim Woo Suk Sul Chaehun Lee Bo-Sun Kang Radiation Detection And Medical Image Sensor Laboratory Department of Nuclear and Quantum Engineering KAIST Daejeon 305-701 Republic of Korea National Nanofab Center Daejeon 305-806 Republic of Korea Samsung Advanced Institute of Technology Gyeonggi Do 446-712 Republic of Korea Department of Radiological Science College of Medical Science Konyang University Daejeon 302-718 Republic of Korea

The prototype SiPM was designed and fabricated for MRI compatible PET using the customized CMOS process at National Nanofab center in KAIST. The SiPM was designed to have a size of 3x3 mm2 composed of micro-cells of 65x65 μm 2 with a fill factor of 68%. The size of a micro-cell was determined by optimization between the photon detection efficiency (PDE) and the dynamic range for the photons of 511 keV from LYSO crystal. In the micro-cell structure, a specially designed quenching capacitor (QC) is added parallel to quenching resistor using the Metal-Insulator-Metal (MIM) process. This QC integrated SiPMs (QC-SiPM) was devised to realize rapid response of output pulses and to enhance the timing resolution of SiPM. Coincidence timing resolution of PET detectors depends on the output pulse shapes which are the convolution of the intrinsic pulse shape of scintillation crystals and the single photon pulse shape at the micro-cell in a SiPM. A quenching capacitor parallel to a quenching resistor provides a fast current path at the beginning stage of avalanche process, than reduces rising time of single photon pulse shape. In this study the rise time of the QC-SiPM signal was analyzed to be 22.5 ns while that for the regular SiPM was 34.3 ns.

关键词： SiPM TOF-PET Quenching capacitor Timing resolution

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Large volume liquid helium relief device verifacation apparatus for the alpha magnetic spectrometer

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AIP Conference Proceedings 2012年第1期1434卷 309-316页

作者： Richard John Klimas P. McIntyre John Colvin John Zeigler Steven Van Sciver Samual Ting National High Magnetic Field Laboratory Tallahassee FL 32310 USA Texas A&M University College Station Texas 77843 USA Houston Advanced Research Center The Woodlands TX 77381 Sensor Design Group LLC Houston TX 77205 National High Magnetic Laboratory Tallahassee FL 32310 USA Massachusetts Institute of Technology Cambridge MA 02139

Here we present details of an experiment for verifying the liquid helium vessel relief device for the Alpha Magnetic Spectrometer-02 (AMS-02). The relief device utilizes a series of rupture discs designed to open in the event of a vacuum failure of the AMS-02 cryogenic system. A failure of this type is classified to be a catastrophic loss of insulating vacuum accident. This apparatus differs from other approaches due to the size of the test volumes used. The verification apparatus consists of a 250 liter vessel used for the test quantity of liquid helium that is located inside a vacuum insulated vessel. A large diameter valve is suddenly opened to simulate the loss of insulating vacuum in a repeatable manner. Pressure and temperature vs. time data are presented and discussed in the context of the AMS-02 hardware configuration.

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Semiconductor scintillator based on photon recycling

Semiconductor scintillator based on photon recycling

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作者： Luryi, Serge Subashiev, Arsen V. University at Stony Brook ECE Department and NY State Center for Advanced Sensor Technology Stony Brook NY 11794-2350 United States

Direct-bandgap semiconductor with high quantum radiative efficiency can operate as a scintillator despite being opaque to its own luminescence. An interband absorption does not finish off the luminescence but merely creates a new minority carrier, which in turn recombines in a predominately radiative fashion. To take full advantage of this photon recycling effect, optically-tight integration of photoreceivers on both sides of the semiconductor scintillator wafer is desirable. © 2011 Elsevier B.V.

关键词： Indium phosphide

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A 1kW-class S-band compact waveguide combiner unit with GaN HPAs for WPT and space communication

A 1kW-class S-band compact waveguide combiner unit with GaN ...

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European Conference on Microwave

作者： Hirofumi Noji Yasuhiro Shibuya Kosuke Isono Masakazu Hori Yuta Kobayashi Toshio Ishizaki Shigeki Furuta Yukio Moriguchi Zen-ichi Yamamoto Shigeo Kawasaki Applied Physics Department Tokyo University of Science Japan Electrical Engineering Department Tokyo University of Science Japan Institute of Space and Astronautical Science Japan AeroSpace Exploration Agency Sagamihara Kanagawa Japan Advanced Devices Development Center Panasonic Corporation Japan Technology Development Division NEC Network and Sensor Systems Limited Japan

Using a GaN high power amplifier and a double 4-inputport circular waveguide combiner, a 1kW S-band compact waveguide combiner unit operating at 2.1 GHz was assembled. The maximum power of 200W was realized with a Peltier device for heat sink. The high power amplifier unit shows the PAE of more than 50% with an AB-class operation under the temperature around 40 degrees C. The four GaN high power amplifiers were combined with the 4-inputports circular waveguide combiner, having an output power of 540W. Further the 1kW output power connecting two 500W-class power combiners was achieved. The combining efficiency of the 1kW-class power combiner unit was achieved to about 90%.

关键词： Power generation Power combiners High power amplifiers Cooling Gallium nitride

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A planar, integrated total internal reflection sensor for biofouling detection

A planar, integrated total internal reflection sensor for bi...

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2010 Solid-State sensors, Actuators, and Microsystems Workshop

作者： Nam, K.H. Choi, W. Yeo, J. Ko, S.H. Lin, Liwei Berkeley Sensor and Actuator Center University of California BerkeleyCA United States Research Center of MEMS Space Telescope Ewha Womans University Korea Republic of LG Innotek Inc Korea Republic of Department of Mechanical Engineering Korea Advanced Institute of Science and Technology Korea Republic of

ISBN: (纸本)0964002485

A planar, integrated total internal reflection (TIR) sensor for the characterizations of biofouling has been demonstrated based on angular interrogation of Fraunhofer diffraction. This sensor is made of a two-mask process to have optical prism and built-in waveguides of 4×0.25μm2 in cross section area. The core and cladding layer of the waveguide are made of silicon nitride and silicon dioxide, respectively and a 780nm in wavelength light source is used in the experiments. Water, ethanol, acetone and glycerol, have all been tested to illustrate the basic refractive index sensing principle of the prototype sensor. Biofouling measurements show that after been immersed into milk as the testing liquid, the surface refractive index of a prototype TIR sensor shifted continuously to as much as 0.0089 for a 9-hour test. As such, this technique could be useful to various biofouling control and monitoring applications, including water desalination, medical, marine and electronic device industries. © 2010TRF.

关键词： Refractive index

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Nonhysteretic phenomena in the metal- Semiconductor phasetransition loop of VO2 films for bolometric sensor applications

Nonhysteretic phenomena in the metal- Semiconductor phasetra...

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作者： Gurvitch, Michael Luryi, Serge Polyakov, Aleksandr Shabalov, Alexander Department of Physics and Astronomy State University of New York Stony Brook NY 11794 United States Stony Brook United States Department of Electrical and Computer Engineering State University of New York Stony Brook NY 11794 United States New York State Center for Advanced Sensor Technology State University of New York Stony Brook NY 11794 United States

Hysteresis observed in the resistive semiconductorto- metal phase transition in VO2 causes problems in bolometric readout, and thus is an obstacle in utilizing this strong phase transition in bolometric sensor applications. It is possible to avoid the unwanted hysteresis when operating in limited temperature ranges within the hysteresis loop of VO2. Nonhysteretic branches (NHBs) traced in such limited temperature intervals turned out to have much higher temperature coefficient of resistance (TCR) than VO2 at room temperature: while TCR at 25 ?C in VO2 is close to 3%, peak TCR values in NHB-s reach 6% in VO2 films on Si/SiOi2 substrates and 21% in films on crystalline sapphire substrates. At the same time, the nanoscopic-scale mixture of semiconducting and metallic phases in VO2 within its hysteresis loop provides forpartially shunted low resistivity, thus creating an unprecedented combination of record high semiconducting TCR and metal-like low resistance. This combination may benefit the uncooled ocal plane array microbolometer IR visualization technology.

关键词： Hysteresis

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