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.
ASIC, we demonstrate that the spectroscopic information contained in the incoming photon beam can be recovered by the implementation in hardware of an algorithm whereby the signal from a single photon is reconstructed and allocated to the pixel with the largest deposition.
MÖ NCH is a 25 mm-pitch charge-integrating detector aimed at exploring the limits of current hybrid silicon detector technology. The small pixel size makes it ideal for high-resolution imaging. With an electronic noise of about 110 eV r.m.s., it opens new perspectives for many synchrotron applications where currently the detector is the limiting factor, e.g. inelastic X-ray scattering, Laue diffraction and soft X-ray or high-resolution color imaging. Due to the small pixel pitch, the charge cloud generated by absorbed X-rays is shared between neighboring pixels for most of the photons. Therefore, at low photon fluxes, interpolation algorithms can be applied to determine the absorption position of each photon with a resolution of the order of 1 mm. In this work, the characterization results of one of the MÖ NCH prototypes are presented under low-flux conditions. A custom interpolation algorithm is described and applied to the data to obtain high-resolution images. Images obtained in grating interferometry experiments without the use of the absorption grating G 2 are shown and discussed. Perspectives for the future developments of the MÖ NCH detector are also presented.
Electron crystallography is a discipline that currently attracts much attention as method for inorganic, organic and macromolecular structure solution. EIGER, a direct-detection hybrid pixel detector developed at the Paul Scherrer Institut, Switzerland, has been tested for electron diffraction in a transmission electron microscope. EIGER features a pixel pitch of 75 Â 75 mm 2 , frame rates up to 23 kHz and a dead time between frames as low as 3 ms. Cluster size and modulation transfer functions of the detector at 100, 200 and 300 keV electron energies are reported and the data quality is demonstrated by structure determination of a SAPO-34 zeotype from electron diffraction data.
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