January 1, 2010.
The definitive version is available at http://dx.doi.org/.
Tests are being conducted to monitor key electrical components. One such component class is DC to DC converters which are used to change a low voltage current source to a higher voltage. They are common in portable electronic devices such as lap top computers and cell phones that are primarily powered by batteries. Studies show that DC to DC converters produce acoustic waves while in use. Acoustic sensors were used to compare sensitivity and bandwidth. Time versus frequency signatures were constructed from the data collected by a digital oscilloscope. The digital oscilloscope collected raw data from various acoustic sensors and software put the data into a single file to display the signature. Signatures may be used in the future to examine time dependent features.
Morris Good and Jeffrey Griffin
Pacific Northwest National Laboratory (PNNL)