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Proceedings Paper

Instrument-quality digital camera that transitioned to low-cost high-volume production
Author(s): William J. Mandl
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Paper Abstract

MOSAD(copyright), Multiplexed OverSample Analog to Digital conversion, is a low power on focal plane analog to digital, A/D, process that places an oversample A/D at each pixel site. Two full custom designs for a visible light staring array were developed with this approach. One design approach uses a silicon photo diode in combination with photo gates at the pixel and the other approach uses an all photo gate sensor for detection. Both arrays were designed with a 320x240 format with the pixels placed on 16 micron centers. The system includes the camera assembly, driver interface assembly, a frame grabber board with integrated decimator and Windows 2000 compatible software for real time image display. The camera includes the sensor, either photo gate or photo diode, mounted on a PC card with support electronics. A custom lens mount attaches the camera to C or CS mount lens. Testing was done with a Tamron 13VM2812 CCTV CS mount lens. Both an RS644 and an RS422 parallel interface card assembly was developed to attach to the frame grabber board. The final iteration cameras were tested at the Amain facility and pictures were taken. At 400 samples per second, measured on chip power consumption is under 10 milliwatts. Noise measurements at sample rates from 400 samples per second to 1,600 samples per second were taken for both parts. The photo diode worked and produced images but it had a sense amplifier problem that prevented adequate noise measurement. At 28 times oversample, the photo gate achieved typical 9 to 11 bits signal to noise with best case measured at 13 bits. Nonuniformity variation was below the noise floor.

Paper Details

Date Published: 18 December 2002
PDF: 12 pages
Proc. SPIE 4818, Infrared Spaceborne Remote Sensing X, (18 December 2002); doi: 10.1117/12.453700
Show Author Affiliations
William J. Mandl, Amain Electronics Co. (United States)

Published in SPIE Proceedings Vol. 4818:
Infrared Spaceborne Remote Sensing X
Marija Strojnik; Bjorn F. Andresen, Editor(s)

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