Detective quantum efficiency of the Timepix4 hybrid pixel detector and its application to parallel-beam diffraction
Zhiyuan Ding1, Nina Dimova2, Jonathan S Barnard3
1University of Oxford, Department of Materials, Parks Road, Oxford, OX1 3PH, UK; The Rosalind Franklin Institute, Harwell Campus, Didcot, OX11 0QX, UK.
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The detective quantum efficiency (DQE) and normalised noise power spectrum (NNPS) of the Timepix4 hybrid pixel detector in event-driven mode in TEM have been measured at 100 kV and 200 kV. In a raw data readout mode, the zero-frequency DQE exceeds 0.9 at both 100 kV and 200 kV. At the Nyquist frequency, the DQE remains above 0.2 at 100 kV but drops close to zero at 200 kV. Initial parallel-beam diffraction data from a polycrystalline gold nanoparticle sample is reported which shows that at 200 kV Timepix4 can detect weak diffracted information beyond a 75 mrad half-angle.
