Adj Professor, Electrical and Computer Engineering
Acousto-optics, opto-electronics, spread-spectrum communications, oversampling. Professor Das, a teacher in university settings for more than 35 years, has led research into a number of important electrical engineering fields. Among areas of expertise for Das are acousto-optics, opto-electronics, spread-spectrum communications, and oversampling in analog -to-digital converters. In acousto-optics, acoustical waves are used to control light signals. Das is currently researching how non-destructive, acousto-electronic sensors can detect flaws in walls and other structures. Spread-spectrum devices transmit low-power radio waves that seem noise-like to devices not clued to how the initial narrow-band signal was encoded when distributed across the spectrum. This fact makes spread-spectrum signals less prone to attack from electronic eaves droppers. Using a new encoding algorithm, Das is helping the U.S. Navy secure ship-bound wireless networks. In sampling, the value of an analog signal is read before it is quantized as a digital number. The resolution of the digital representation is normally dependent on the number of bits of the output device. But high resolutions can sometimes be achieved at low-bit counts by oversampling, or reading the initial signal far more frequently.
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