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Thermal dynamics and the time constant domain
IEEE Transactions on Components and Packaging Technologies, 2000The time-constant spectrum representation is a useful description of the dynamic thermal behavior of packages, assemblies and microsystems. After presenting the idea of the time constant spectrum representation of microelectronic structures, the paper provides an algorithm that can be used for time constant spectrum calculation in thermal simulator ...
V. Szekely, M. Rencz
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Uncooled IRFPA with high-performance and low-thermal time constant
SPIE Proceedings, 2004Uncooled infrared focal plane arrays are being developed for a wide range of thermal imaging applications. Developments are focused on the improvement of their sensitivity enabling the possibility of reducing the pixel pitch in order to decrease the total system size and weight by using smaller optics.
Jean Luc Tissot +6 more
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Short time-constant thermal self-defocusing of laser beams
IEEE Journal of Quantum Electronics, 1969Time constants as low as 20 μs have been observed when the beam of a helium-neon laser is focused on a small spot on a thin dye sample and the thermal self-defocusing effects observed. The short time constant arises mainly from the small spot size, but to some extent from axial heat flow to the cell ends.
F. Dabby +3 more
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Thermal Time Constant Between Powdered CMN and Superfluid 3He
1977We report measurement of the thermal relaxation time constant of a mixture of powdered cerium magnesium nitrate (CMN) and liquid 3He in its superfluid phases. At the superfluid transition of liquid 3He, there is a discontinuity in the thermal time constant.
T. Chainer, H. Kojima
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Thermal Time Constant Extraction for HBTs from S-Parameter Measurements
AEU - International Journal of Electronics and Communications, 2003Abstract In this letter we present a novel approach to extract the thermal time constant of HBTs from S-parameter data. The method is based on a calculation of the frequency dependent negative output conductance of the devices due to self-heating effects. It is derived both analytically as well as from an electro-thermal feedback model.
Franz X. Sinnesbichler +1 more
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Measurement of MEMS thermal actuator time constant using image blur
Journal of Micromechanics and Microengineering, 2011A method of experimentally determining the time constants of MEMS thermal actuators from an analysis of blurred still camera images of high frequency motion is presented. The response of MEMS thermal actuators to harmonic excitation falls off with increasing frequency.
Ben Bschaden, Ted Hubbard, Marek Kujath
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Time constant and lateral resonances of thermal vertical bimorph actuators
Journal of Micromechanics and Microengineering, 2002Thermal vertical bimorph actuators consist of silicon beams side-coated with aluminium. Upon heating they bend like a bimetal and produce movement in the wafer plane. We have measured the time constant describing the deflection response of the actuator to input pulses. Depending on the dimensions of the actuator, the time constant ranges from 0.5 ms to
Sehr, H +8 more
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The Thermal Time Constant of a Bolometer
IRE Transactions on Instrumentation, 1955G. U. Sorger
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Thermal-blooming time constant
Journal of the Optical Society of America, 1982Thermal blooming is analyzed by using a wave-propagation code to determine the speed of response of the blooming effect to changes in the transmitted laser beam. Results are developed to indicate where along the propagation path the dominant part of the thermal-blooming effects arise.
David L. Fried, Gus E. Mevers
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Time constants in thermal laser medicine
Lasers in Surgery and Medicine, 1989AbstractTemperature rise of laser‐irradiated tissue due to direct absorption of laser light is related to laser parameters (power, spot size, irradiation time, and repetition rate) and tissue parameters (absorption and scattering coefficients, density, heat capacity, and thermal conductivity).
M J, van Gemert, A J, Welch
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