2011
DOI: 10.1016/j.nima.2010.06.181
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Centroiding algorithms for high speed crossed-strip readout of microchannel plate detectors

Abstract: Imaging microchannel plate (MCP) detectors with cross strip (XS) readout anodes require centroiding algorithms to determine the location of the amplified charge cloud from the incident radiation, be it photon or particle. We have developed a massively parallel XS readout electronic system that employs an amplifier and ADC for each strip and uses this digital data to calculate the centroid of each event in real time using a field programmable gate array (FPGA). Doing the calculations in real time in the front e… Show more

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Cited by 21 publications
(15 citation statements)
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“…This is a pipelined process, where previous samples are retained until clocked out of the algorithm. Detection algorithms 14,15 can then operate on the output of the FIR filters to identify real events ("self triggering") and store the 64 outputs into a special "Event Pipeline" where the input rate is now the event rate. The timing of the event can be calculated with sub-20 ns accuracy with digital implementation of certain interpolating algorithms (e.g.…”
Section: Pxs Electronicsmentioning
confidence: 99%
“…This is a pipelined process, where previous samples are retained until clocked out of the algorithm. Detection algorithms 14,15 can then operate on the output of the FIR filters to identify real events ("self triggering") and store the 64 outputs into a special "Event Pipeline" where the input rate is now the event rate. The timing of the event can be calculated with sub-20 ns accuracy with digital implementation of certain interpolating algorithms (e.g.…”
Section: Pxs Electronicsmentioning
confidence: 99%
“…The incident photons position is extrapolated by measuring the charge cloud distribution for every event, over orthogonal anode strips being 25 µm wide and 625 µm apart [1]. Using an older laboratory readout system (Parallel Cross Strip -PXS), a spatial resolution of 17 µm FWHM was measured [2]. Our base line detector has an aperture of 50 x 50 mm 2 , therefore the readout system must continuously measure 160 channels.…”
Section: Introductionmentioning
confidence: 99%
“…Selected, often used centroiding algorithms for sparse emission data sets, are center-of-gravity (COG) centroiding, centroiding algorithms based on analytical functions (that describe the emission cloud) or "interpolated convolution". Center-of-gravity (COG) centroiding [9,10,13,[15][16][17] is a simple and popular centroiding method. The center coordinates of a signal cluster are determined by calculating a weighted average over the signal cluster.…”
Section: Introductionmentioning
confidence: 99%
“…The center coordinates of a signal cluster are determined by calculating a weighted average over the signal cluster. A modification of this technique is the "all above threshold COG" [16,17], which takes into account all detector elements within a signal cluster that have a pre-defined signal level. There are several different centroiding algorithms based on analytical functions.…”
Section: Introductionmentioning
confidence: 99%
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