Dr. Nickolay V. Lavrik Profile

Dr. Nickolay V. Lavrik

at Oak Ridge National Lab

SPIE Involvement:

Author

Publications (11)

Proceedings Article | 17 October 2014 Paper

Nonlinear mechanical resonators for ultra-sensitive mass detection

P. Datskos, N. Lavrik

Proceedings Volume 9248, 924804 (2014) https://doi.org/10.1117/12.2071922

KEYWORDS: Resonators, Oscillators, Mechanical sensors, Transducers, Signal to noise ratio, Interference (communication), Thermal sensing, Microresonators, Sensors, Thermal effects

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Proceedings Article | 7 March 2014 Paper

Magnified neutron radiography with coded sources

Philip Bingham, Hector Santos-Villalobos, Nickolay Lavrik, Hassina Bilheux, Jens Gregor

Proceedings Volume 9020, 90200A (2014) https://doi.org/10.1117/12.2044587

KEYWORDS: Imaging systems, Sensors, Radiography, Image resolution, Reconstruction algorithms, Photomasks, Coded apertures, Gadolinium, Manufacturing, Algorithm development

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Proceedings Article | 25 May 2012 Paper

Review of pyroelectric thermal energy harvesting and new MEMs-based resonant energy conversion techniques

Scott Hunter, Nickolay Lavrik, Salwa Mostafa, Slo Rajic, Panos Datskos

Proceedings Volume 8377, 83770D (2012) https://doi.org/10.1117/12.920978

KEYWORDS: Capacitors, Energy efficiency, Thermoelectric materials, Energy conversion efficiency, Pyroelectric materials, Temperature metrology, Energy harvesting, Instrument modeling, Thermal modeling, Dielectrics

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Harvesting electrical energy from thermal energy sources using pyroelectric conversion techniques has been under investigation for over 50 years, but it has not received the attention that thermoelectric energy harvesting techniques have during this time period. This lack of interest stems from early studies which found that the energy conversion efficiencies achievable using pyroelectric materials were several times less than those potentially achievable with thermoelectrics. More recent modeling and experimental studies have shown that pyroelectric techniques can be cost competitive with thermoelectrics and, using new temperature cycling techniques, has the potential to be several times as efficient as thermoelectrics under comparable operating conditions. This paper will review the recent history in this field and describe the techniques that are being developed to increase the opportunities for pyroelectric energy harvesting. The development of a new thermal energy harvester concept, based on temperature cycled pyroelectric thermal-to-electrical energy conversion, are also outlined. The approach uses a resonantly driven, pyroelectric capacitive bimorph cantilever structure that can be used to rapidly cycle the temperature in the energy harvester. The device has been modeled using a finite element multi-physics based method, where the effect of the structure material properties and system parameters on the frequency and magnitude of temperature cycling, and the efficiency of energy recycling using the proposed structure, have been modeled. Results show that thermal contact conductance and heat source temperature differences play key roles in dominating the cantilever resonant frequency and efficiency of the energy conversion technique. This paper outlines the modeling, fabrication and testing of cantilever and pyroelectric structures and single element devices that demonstrate the potential of this technology for the development of high efficiency thermal-toelectrical energy conversion devices.

Proceedings Article | 24 May 2011 Paper

Detection of electromagnetic waves using MEMS antennas

P. Datskos, N. Lavrik, J. Tobin, L. Bowland

Proceedings Volume 8046, 80460J (2011) https://doi.org/10.1117/12.888863

KEYWORDS: Antennas, Microelectromechanical systems, Electromagnetic radiation, Electromagnetism, Sensors, Silicon, Receivers, Oscillators, Signal detection, Electric field sensors

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Proceedings Article | 18 May 2011 Paper

Development of MEMS based pyroelectric thermal energy harvesters

Scott Hunter, Nickolay Lavrik, Thirumalesh Bannuru, Salwa Mostafa, Slo Rajic, Panos Datskos

Proceedings Volume 8035, 80350V (2011) https://doi.org/10.1117/12.882125

KEYWORDS: Capacitors, Solar energy, Temperature metrology, Microelectromechanical systems, Energy efficiency, Energy conversion efficiency, Fabrication, Dielectrics, Computing systems, Thermal modeling

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Proceedings Article | 16 April 2008 Paper

Progress with MEMS based UGS (IR/THz)

D. Grbovic, S. Rajic, N. Lavrik, P. Datskos

Proceedings Volume 6963, 696317 (2008) https://doi.org/10.1117/12.786633

KEYWORDS: Sensors, Microelectromechanical systems, Silicon, Silica, Semiconducting wafers, Terahertz radiation, Infrared sensors, Finite element methods, Infrared imaging, Thermography

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Proceedings Article | 8 June 2007 Paper

Uncooled MEMS IR imagers with optical readout and image processing

Nickolay Lavrik, Rick Archibald, Dragoslav Grbovic, Slo Rajic, Panos Datskos

Proceedings Volume 6542, 65421E (2007) https://doi.org/10.1117/12.724346

KEYWORDS: Microelectromechanical systems, Infrared imaging, Staring arrays, Image processing, Associative arrays, Thermography, Imaging systems, Image quality, Silicon, Video

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Proceedings Article | 17 May 2006 Paper

Uncooled infrared imaging using bimaterial microcantilever arrays

N. Lavrik, D. Grbovic, S. Rajic, P. Datskos, D. Forrai, E. Nelson, J. Devitt, B. McIntyre

Proceedings Volume 6206, 62061K (2006) https://doi.org/10.1117/12.666125

KEYWORDS: Infrared imaging, Microelectromechanical systems, Staring arrays, Sensors, Thermography, Imaging systems, Silicon, Prototyping, Infrared detectors, Head

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Proceedings Article | 22 January 2005 Paper

Performance of uncooled microcantilever thermal detectors

Panos Datskos, Slobodan Rajic, Nickolay Lavrik

Proceedings Volume 5721, (2005) https://doi.org/10.1117/12.590823

KEYWORDS: Sensors, Infrared detectors, Photodetectors, Infrared sensors, Thermography, Signal to noise ratio, Infrared imaging, Infrared radiation, Interference (communication), Photodiodes

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