摘要:
A metallurgical process expands the grain structure in a heat sink from a fine grain to a coarse grain to improve the thermal conductivity of the heat sink. The temperature of the heat sink is raised to a level high enough to lead to a secondary re-crystallization grain growth in the metal alloy. The temperature of the heat sink is then gradually lowered to a cryogenic temperature and then immediately brought back up to ambient temperature to strengthen the material.
摘要:
A circuit board includes two planes. A via spans the planes, and an impedance component is placed in the via. The impedance component is coupled to both of the planes. The impedance component provides an impedance between the planes without the use of traces or hand soldering of components.
摘要:
A circuit board includes two planes. A via spans the planes, and an impedance component is placed in the via. The impedance component is coupled to both of the planes. The impedance component provides an impedance between the planes without the use of traces or hand soldering of components.
摘要:
A method and apparatus comprising using buried microchannels to cool specific areas of a substrate over which high heat generating elements of integrated circuits, circuits or devices are processed is disclosed. In one embodiment of the method and apparatus comprise running a cooling fluid thorough a buried microchannel under a heat generating element to locally cool the substrate.
摘要:
Piezoelectric wafers are affixed to a circuit card to control displacement of the circuit card when vibrated. A trigger wafer located at an anti-node of the dominant mode shape produces a voltage as a function of modal displacement. A control system responsive to the trigger wafer produces voltages that are applied to flex wafers at a different anti-node of the dominant mode shape. The flex wafers expand and contract in a manner that reduces the modal displacement of the circuit card. Multiple flex wafers can exist, affixed to the circuit card substantially opposite each other, or a single flex wafer can exist with a single trigger wafer. The trigger wafer can be located substantially opposite the flex wafer or can be located elsewhere on the circuit card.
摘要:
Piezoelectric material is embedded in epoxy layers of circuit cards to control thermal expansion and contraction as a function of temperature changes. A temperature sensor and thermostat generates a controlled voltage as a function of temperature and applies the voltage to piezoelectric blocks within the circuit card. Local areas of the circuit card can have different amounts of piezoelectric material or different thermostats. Piezoelectric blocks can be arranged in regular patterns or can be randomly or pseudo-randomly placed.
摘要:
A semiconductor substrate with integrated circuit devices on its front side and a high thermal conductivity layer such as diamond on its back side, with components such as capacitors embedded in the high thermal conductivity layer and coupled to the front side integrated circuits with vias through the substrate.
摘要:
The present invention provides a fluorescent imaging thermographic method and system for use particularly in surface temperature measurements, which are reproducible over time. The invention provides a temperature-sensitive fluorescent probe comprising a rare earth compound in an ultraviolet and fluorescence transparent medium wherein the intensity of fluorescence varies as the temperature varies, in particular, provided are probes comprising Europium(1,1,1,5,5,5-hexafluoroacetylacetone)3 for measuring temperatures greater than 24° C., and Terbium(1,1,1,5,5,5-hexafluoroacetylacetone)3 for measuring temperatures less than 24° C. The probe is applied as a layer to a surface, exposed to fluorescence-inducing energy, and emitted fluorescence measured. A ratio imaging algorithm enables the temperature at each location on the surface to be determined.