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Record Details

Record 97 of 3950
A High-Speed, Event-Driven, Active Pixel Sensor Readout for Photon-Counting Microchannel Plate Detectors
Author and Affiliation:
Kimble, Randy A.(NASA Goddard Space Flight Center, Greenbelt, MD United States)
Pain, B.(Jet Propulsion Lab., California Inst. of Tech., Pasadena, CA United States)
Norton, T. J.(NASA Goddard Space Flight Center, Greenbelt, MD United States)
Haas, P.(NASA Goddard Space Flight Center, Greenbelt, MD United States)
Fisher, Richard R. [Technical Monitor]
Abstract: Silicon array readouts for microchannel plate intensifiers offer several attractive features. In this class of detector, the electron cloud output of the MCP intensifier is converted to visible light by a phosphor; that light is then fiber-optically coupled to the silicon array. In photon-counting mode, the resulting light splashes on the silicon array are recognized and centroided to fractional pixel accuracy by off-chip electronics. This process can result in very high (MCP-limited) spatial resolution for the readout while operating at a modest MCP gain (desirable for dynamic range and long term stability). The principal limitation of intensified CCD systems of this type is their severely limited local dynamic range, as accurate photon counting is achieved only if there are not overlapping event splashes within the frame time of the device. This problem can be ameliorated somewhat by processing events only in pre-selected windows of interest or by using an addressable charge injection device (CID) for the readout array. We are currently pursuing the development of an intriguing alternative readout concept based on using an event-driven CMOS Active Pixel Sensor. APS technology permits the incorporation of discriminator circuitry within each pixel. When coupled with suitable CMOS logic outside the array area, the discriminator circuitry can be used to trigger the readout of small sub-array windows only when and where an event splash has been detected, completely eliminating the local dynamic range problem, while achieving a high global count rate capability and maintaining high spatial resolution. We elaborate on this concept and present our progress toward implementing an event-driven APS readout.
Publication Date: Jan 01, 2001
Document ID:
20020015531
(Acquired Feb 01, 2002)
Subject Category: INSTRUMENTATION AND PHOTOGRAPHY
Document Type: Preprint
Meeting Information: 199th American Astronomical Society Meeting; 6-10 Jan. 2002; Washington, DC; United States
Meeting Sponsor: American Astronomical Society; United States
Contract/Grant/Task Num: RTOP 344-01-11
Financial Sponsor: NASA Goddard Space Flight Center; Greenbelt, MD United States
Organization Source: NASA Goddard Space Flight Center; Greenbelt, MD United States
Description: 1p; In English
Distribution Limits: Unclassified; Publicly available; Unlimited
Rights: No Copyright
NASA Terms: FIBER OPTICS; HIGH SPEED; MICROCHANNEL PLATES; PHOTONS; PIXELS; IMAGING TECHNIQUES; CHARGE INJECTION DEVICES; ELECTRON CLOUDS; CHARGE COUPLED DEVICES; HIGH RESOLUTION; SILICON; SPATIAL RESOLUTION; CMOS; DYNAMIC RANGE
Availability Source: Other Sources
Availability Notes: Abstract Only
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