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Proceedings Paper

Smart pixels with smart illumination for memory applications
Author(s): W. Randall Babbitt; Mohammad Azadeh; Robert B. Darling
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Paper Abstract

The simple and compact optical design of the recently proposed smart pixels with smart illumination (SPSI) concept allows an integrated emitter and detector array to dynamically and efficiently illuminate and sense remote objects with enhanced functionality. Each pixel can control its associated photodetector(s) illumination level or modulation characteristics through electronic feedback from the pixel's photodetector(s) to its emitter. Features include intensity compression and background subtraction on every pixel. The SPSI concept has several potential applications in sensor array technology including edge detection; focus and tracking sensors; dynamic spotlight tracking systems; tracking of objects in manufacturing; and ranging. The features of SPSI can be exploited in the writing and reading interfaces of page-oriented optical memory systems. The simple optical design coupled with the electrically integrated array of emitters and detectors allows for simultaneous sensing of all elements of a two dimensional array, with each pixel adjusting to maximize its sensitivity. The opto-electronic feedback in each pixel allows for adjustment for variation in reflectivity (or emission) across a memory material and maximization of each photodetectors' dynamic range. Differential sensing capabilities allow for precise detection of dual rail digital or analog signals. Pixel-by-pixel background subtraction can reduce the effects of scattering and crosstalk between pixels. The dynamic spatial structure of the illumination could play an integral role in adaptive error correction and encryption algorithms.

Paper Details

Date Published: 5 November 1998
PDF: 8 pages
Proc. SPIE 3468, Advanced Optical Memories and Interfaces to Computer Storage, (5 November 1998); doi: 10.1117/12.330408
Show Author Affiliations
W. Randall Babbitt, Montana State Univ./Bozeman (United States)
Mohammad Azadeh, Univ. of Washington (United States)
Robert B. Darling, Univ. of Washington (United States)

Published in SPIE Proceedings Vol. 3468:
Advanced Optical Memories and Interfaces to Computer Storage
Pericles A. Mitkas; Zameer U. Hasan, Editor(s)

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