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Sökning: WFRF:(Blaj M)

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  • Ballabriga, Rafael, et al. (författare)
  • The Medipix3RX: a high resolution, zero dead-time pixel detector readout chip allowing spectroscopic imaging
  • 2013
  • Ingår i: Journal of Instrumentation. - 1748-0221. ; 8:2, s. C02016-
  • Tidskriftsartikel (refereegranskat)abstract
    • The Medipix3 chips have been designed to permit spectroscopic imaging in highly segmented hybrid pixel detectors. Spectral degradation due to charge sharing in the sensor has been addressed by means of an architecture in which adjacent pixels communicate in the analog and digital domains on an event-by-event basis to reconstruct the deposited charge in a neighbourhood prior to the assignation of the hit to a single pixel. The Medipix3RX chip architecture is presented. The first results for the characterization of the chip with 300 μm thick Si sensors are given. ~ 72e− r.m.s. noise and ~ 40e− r.m.s. of threshold dispersion after chip equalization have been measured in Single Pixel Mode of operation. The homogeneity of the image in Charge Summing mode is comparable to the Single Pixel Mode image. This demonstrates both modes are suitable for X-ray imaging applications.
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  • Wong, Winnie S, et al. (författare)
  • Electrical measurements of a multi-mode hybrid pixel detector ASIC for radiation detection
  • 2012
  • Ingår i: Journal of Instrumentation. - 1748-0221. ; 7:1, s. Art. no. C01056-
  • Tidskriftsartikel (refereegranskat)abstract
    • We present the first electrical measurements of an application-specific integrated circuit (ASIC) to be used in a hybrid pixel detector intended for dosimetry and radiation detection. The dosimeter has three programmable modes of operation: photon counting mode, energy integration mode, and dosimetry mode. The ASIC comprises a matrix of 16 by 16 (256 total) square pixels of 220 ÎŒm pitch, providing 12.4 mm 2 of segmented active area. Each pixel can be configured to operate in one of the three radiation measurement modes, with programmable-depth counters and shift registers to tailor the data word size and optimise the readout frame-rate in a given mode. The individual energies of impinging photons are determined through programmable analogue energy threshold discrimination, time over threshold measurement, or a combination thereof. Furthermore, the dosimetry mode contains 16 digital energy thresholds and automatically sorts data into 16 corresponding energy bin registers. The chip's output is therefore pre-processed charge spectra of the radiation field. This paper discusses results from measurements taken using programmable test-pulses to inject controlled stimuli into the pixel circuits.
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  • Resultat 1-6 av 6

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