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To find the changes of surface compositions during life time of the Scandia-doped impregnated dispenser cathodes, two cathodes have been tested at an activation temperature of 1150°CB-Mo and an operation temperature of 1000°CB-Mo, respectively, in an AES system up to more than 7,000 hours. Surface compositions were monitored in-situ at intervals. The tested results have been reported and discussed...
Static and dynamic hot spots limit the performance and reliability of electronic devices and ICs. We show that transient thermoreflectance imaging using a CCD camera can measure temperature distribution in chips with 0.1 °C temperature, 100 nanosecond time, and submicron spatial resolution. It is possible to measure the temperature on metal interconnects in wire-bonded chips and, with through-the-substrate...
Emission properties of Scandia Doped Impregnated (SDI) cathodes tested at DC model has been investigated in close-spaced diodes with water-cooled copper anodes. Space Charge Limited (SCL) current density of over 40 A/cm2 has been measured at 950 ºCb after temperature compensation for electron cooling. The life test has lasted for more than 500 hours and is going on.
Automatic temperature control is the most significant aspect in tunnel microwave heating system. The temperature-control circuit module is responsible to detect the temperatures of the materials and send instructions to the execution module to adjust the temperatures to desirable data. Considerable amount of energy and time can be saved using this kind of system rather than traditional infrared heating...
This paper designed a new system of temperature measurement applied to hot packs. It introduced the overall design ideas and host computer program of management software with VC++6.0. The system included a group of the 1-wire digital integrated temperature DS18B20 sensors, used for the multipoint testing. The hardware structure and software flow diagram of the system were given. Several key technical...
The study of thin film thermal properties is an important component of microelectronic and thermoelectric material research. Accurate measurements of such properties, especially in-plane thermal conductivity is known to be challenging. In this paper, we briefly review the thin film inplane thermal conductivity measurement methods that have been developed up to date, and demonstrate a new method with...
Thermal performance is an important factor in the design of power devices. Previous studies have shown that nonuniform temperature distributions occur in both small transistors [1,2,3] and in large area power transistor devices [4,5,6]. We present extensive thermal characterization of large scale transistor arrays that are typical in power applications. Thermal images using the thermoreflectance technique...
According to disadvantages of conventional artificial monitor style or wire transmission monitor style, we adopt wireless communication network between field controllers and monitor central PC to design a distributed clinic medical intelligent physiological parameter data monitor system based on sensor technology, single chip microprocessor (SCM) technology, and visual instrument (VI) technology,...
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