Vertical Isolation for Photodiodes in CMOS Imagers

NASA Tech Briefs, November 2008 quency mode; analysis of the results led to the conclusion that this mode is useful for measuring thicknesses between 0.5 and 1 m. Several modifications have been conceived for implementation in further development toward an improved practical system: • The system would function in a single frequency-band/mode (100 to 1,200 MHz) that would afford a resolution of about 15 cm. • There would be a single antenna system that would be optimized for the entire 100-to-1,000-MHz frequency band. • To enable ice-thickness surveys over larger areas, the system would be made capable of operating aboard a low-flying aircraft that could be either piloted or robotic. • Data-processing techniques to deconvolve the system response have been developed on the basis of impulse-response measurements over a calm ocean. Implementation of these techniques in the system would enable correction for imperfections of the system and would thereby increase the effective sensitivity of the system. This work was done by Prasad Gogineni and Pannir Kanagaratnam of the University of Kansas and Benjamin M. Holt of Caltech for NASA’s Jet Propulsion Laboratory. Further information is contained in a TSP (see page 1). NPO-45565