SPAN - A novel high speed high resolution position readout

Details SPAN - A novel high speed high resolution position readout SPAN - A novel high speed high resolution position readout

Nov 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990spie.1344..324l&link_type=abstract

IN: EUV, X-ray, and Gamma-ray instrumentation for astronomy; Proceedings of the Meeting, San Diego, CA, July 11-13, 1990 (A92-20

Astronomy and Astrophysics

Astronomy

4

Electric Charge, Electrical Measurement, Electrodes, Imaging Techniques, Photons, Readout, Anodes, Equipment Specifications, High Resolution, Pixels

Scientific paper

The concept for the 2D position-readout device for the SPAN photon-counting detector is presented with attention to the count rates, spatial resolution, and charge-measurement precision. The electrodes which are deposited on the planar substrate result from charge division induced by a charge cloud, the centroid position of which is encoded by the ratio of charge magnitudes. The SPAN electrode design is analyzed and theorized to permit 1000 x 1000-pixel resolution at 1 MHz. The SPAN spiral-anode six-electrode design is compared to the Vernier-anode twelve-electrode structure for encoding 2D position, and digital precision is analyzed at count rates up to 1 MHz. The SPAN readout affords resolution levels of up to 1/1000 across the entire active area at 8-bit digitization.

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