scholarly journals In situtwo-dimensional imaging quick-scanning XAFS with pixel array detector

2011 ◽  
Vol 18 (6) ◽  
pp. 919-922 ◽  
Author(s):  
Hajime Tanida ◽  
Hisao Yamashige ◽  
Yuki Orikasa ◽  
Masatsugu Oishi ◽  
Yu Takanashi ◽  
...  
Keyword(s):  
Dynamic Range ◽  
Signal To Noise Ratio ◽  
Low Noise ◽  
Array Detector ◽  
Large Area ◽  
Scanning Method ◽  
Two Dimensional Image ◽  
Pixel Array ◽  
Pixel Array Detector ◽  
Good Signal

Quick-scanning X-ray absorption fine structure (XAFS) measurements were performed in transmission mode using a PILATUS 100K pixel array detector (PAD). The method can display a two-dimensional image for a large area of the order of a centimetre with a spatial resolution of 0.2 mm at each energy point in the XAFS spectrum. The time resolution of the quick-scanning method ranged from 10 s to 1 min per spectrum depending on the energy range. The PAD has a wide dynamic range and low noise, so the obtained spectra have a good signal-to-noise ratio.

scholarly journals Next generation X-ray detectors for in-house XRD

2008 ◽  
Vol 23 (2) ◽  
pp. 101-105 ◽  
Author(s):  
Takeyoshi Taguchi ◽  
Christian Brönnimann ◽  
Eric F. Eikenberry
Keyword(s):  
Generation X ◽  
Dynamic Range ◽  
Single Photon ◽  
Signal To Noise Ratio ◽  
Photon Counting ◽  
Next Generation ◽  
Large Area ◽  
X Ray ◽  
Array Detectors ◽  
Good Signal

A novel type X-ray detector, called PILATUS, has been developed at the Paul Scherrer Institut in Switzerland during the last decade. PILATUS detectors are two-dimensional hybrid pixel array detectors, which operate in single-photon counting mode. PILATUS detectors feature a very wide dynamic range (1:1 000 000), very short readout time (<3.0 ms), no readout noise, and very high counting rate (>2×106counts/s/pixel). In addition, a lower energy threshold can be set in order to suppress fluorescence background from the sample, thus a very good signal-to-noise ratio is achieved. The combination of these features for area detectors is unique and thus the PILATUS detectors are considered to be the next generation X-ray detectors. The basic building block of all the detectors is the PILATUS module having an active area of 83.8×33.5 mm2. The PILATUS 100K is a complete detector system with one module. PILATUS detector systems can have other configurations, including large area systems consisting of 20 to 60 modules that can cover up to an area of 431×448 mm2. Such large systems are mainly used for macromolecular structure determination, such as protein crystallography and small angle X-ray scattering. The PILATUS 100K detector can be easily adapted to many systems; the single-module detector is integrated to an in-house X-ray diffraction (XRD) system. Examples of XRD measurements with the PILATUS 100K detector are given.

scholarly journals High Dynamic Range Pixel Array Detector for Scanning Transmission Electron Microscopy

2016 ◽  
Vol 22 (1) ◽  
pp. 237-249 ◽  
Author(s):  
Mark W. Tate ◽  
Prafull Purohit ◽  
Darol Chamberlain ◽  
Kayla X. Nguyen ◽  
Robert Hovden ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Electron Microscope ◽  
Scanning Transmission Electron Microscopy ◽  
Dynamic Range ◽  
Array Detector ◽  
Transmission Electron ◽  
Pixel Array ◽  
Scanning Transmission ◽  
Pixel Array Detector

AbstractWe describe a hybrid pixel array detector (electron microscope pixel array detector, or EMPAD) adapted for use in electron microscope applications, especially as a universal detector for scanning transmission electron microscopy. The 128×128 pixel detector consists of a 500µm thick silicon diode array bump-bonded pixel-by-pixel to an application-specific integrated circuit. The in-pixel circuitry provides a 1,000,000:1 dynamic range within a single frame, allowing the direct electron beam to be imaged while still maintaining single electron sensitivity. A 1.1 kHz framing rate enables rapid data collection and minimizes sample drift distortions while scanning. By capturing the entire unsaturated diffraction pattern in scanning mode, one can simultaneously capture bright field, dark field, and phase contrast information, as well as being able to analyze the full scattering distribution, allowing true center of mass imaging. The scattering is recorded on an absolute scale, so that information such as local sample thickness can be directly determined. This paper describes the detector architecture, data acquisition system, and preliminary results from experiments with 80–200 keV electron beams.

scholarly journals The high dynamic range pixel array detector (HDR-PAD): Concept and design

2016 ◽  
Author(s):  
Katherine S. Shanks ◽  
Hugh T. Philipp ◽  
Joel T. Weiss ◽  
Julian Becker ◽  
Mark W. Tate ◽  
...  
Keyword(s):  
Dynamic Range ◽  
High Dynamic Range ◽  
Array Detector ◽  
Pixel Array ◽  
High Dynamic ◽  
Pixel Array Detector

scholarly journals High dynamic range CdTe mixed-mode pixel array detector (MM-PAD) for kilohertz imaging of hard x-rays

2020 ◽  
Vol 15 (06) ◽  
pp. P06025-P06025
Author(s):  
H.T. Philipp ◽  
M.W. Tate ◽  
K.S. Shanks ◽  
P. Purohit ◽  
S.M. Gruner
Keyword(s):  
Mixed Mode ◽  
Dynamic Range ◽  
High Dynamic Range ◽  
Array Detector ◽  
X Rays ◽  
Pixel Array ◽  
High Dynamic ◽  
Pixel Array Detector

scholarly journals Lorentz-STEM imaging of Fields and Domains using a High-Speed, High-Dynamic Range Pixel Array Detector at Atomic Resolution

2015 ◽  
Vol 21 (S3) ◽  
pp. 2309-2310 ◽  
Author(s):  
Kayla X. Nguyen ◽  
Robert Hovden ◽  
Mark W. Tate ◽  
Prafull Purohit ◽  
John Heron ◽  
...  
Keyword(s):  
High Speed ◽  
Dynamic Range ◽  
High Dynamic Range ◽  
Atomic Resolution ◽  
Array Detector ◽  
Pixel Array ◽  
High Dynamic ◽  
Pixel Array Detector

scholarly journals Sub-microsecond-resolved multi-speckle X-ray photon correlation spectroscopy with a pixel array detector

2018 ◽  
Vol 25 (5) ◽  
pp. 1408-1416 ◽  
Author(s):  
Qingteng Zhang ◽  
Eric M. Dufresne ◽  
Suresh Narayanan ◽  
Piotr Maj ◽  
Anna Koziol ◽  
...  
Keyword(s):  
Dynamic Range ◽  
Photon Correlation Spectroscopy ◽  
Correlation Spectroscopy ◽  
Acquisition Time ◽  
Array Detector ◽  
Photon Correlation ◽  
X Ray ◽  
Burst Mode ◽  
Pixel Array ◽  
Pixel Array Detector

Small-angle X-ray photon correlation spectroscopy (XPCS) measurements spanning delay times from 826 ns to 52.8 s were performed using a photon-counting pixel array detector with a dynamic range of 0–3 (2 bits). Fine resolution and a wide dynamic range of time scales was achieved by combining two modes of operation of the detector: (i) continuous mode, where data acquisition and data readout are performed in parallel with a frame acquisition time of 19.36 µs, and (ii) burst mode, where 12 frames are acquired with frame integration times of either 2.56 µs frame−1or 826 ns frame−1followed by 3.49 ms or 1.16 ms, respectively, for readout. The applicability of the detector for performing multi-speckle XPCS was demonstrated by measuring the Brownian dynamics of 10 nm-radius gold and 57 nm-radius silica colloids in water at room temperature. In addition, the capability of the detector to faithfully record one- and two-photon counts was examined by comparing the statistical distribution of photon counts with expected probabilities from the negative binomial distribution. It was found that in burst mode the ratio of 2 s to 1 s is markedly smaller than predicted and that this is attributable to pixel-response dead-time.

scholarly journals A large area diamond-based beam tagging hodoscope for ion therapy monitoring

2018 ◽  
Vol 170 ◽  
pp. 09005 ◽  
Author(s):  
M.-L. Gallin-Martel ◽  
L. Abbassi ◽  
A. Bes ◽  
G. Bosson ◽  
J. Collot ◽  
...  
Keyword(s):  
Detection Efficiency ◽  
Signal To Noise Ratio ◽  
Therapy Monitoring ◽  
Chemical Vapor ◽  
X Rays ◽  
Reaction Products ◽  
Large Area ◽  
Position Measurement ◽  
Set Up ◽  
Good Signal

The MoniDiam project is part of the French national collaboration CLaRyS (Contrôle en Ligne de l’hAdronthérapie par RaYonnements Secondaires) for on-line monitoring of hadron therapy. It relies on the imaging of nuclear reaction products that is related to the ion range. The goal here is to provide large area beam detectors with a high detection efficiency for carbon or proton beams giving time and position measurement at 100 MHz count rates (beam tagging hodoscope). High radiation hardness and intrinsic electronic properties make diamonds reliable and very fast detectors with a good signal to noise ratio. Commercial Chemical Vapor Deposited (CVD) poly-crystalline, heteroepitaxial and monocrystalline diamonds were studied. Their applicability as a particle detector was investigated using α and β radioactive sources, 95 MeV/u carbon ion beams at GANIL and 8.5 keV X-ray photon bunches from ESRF. This facility offers the unique capability of providing a focused (~1 μm) beam in bunches of 100 ps duration, with an almost uniform energy deposition in the irradiated detector volume, therefore mimicking the interaction of single ions. A signal rise time resolution ranging from 20 to 90 ps rms and an energy resolution of 7 to 9% were measured using diamonds with aluminum disk shaped surface metallization. This enabled us to conclude that polycrystalline CVD diamond detectors are good candidates for our beam tagging hodoscope development. Recently, double-side stripped metallized diamonds were tested using the XBIC (X Rays Beam Induced Current) set-up of the ID21 beamline at ESRF which permits us to evaluate the capability of diamond to be used as position sensitive detector. The final detector will consist in a mosaic arrangement of double-side stripped diamond sensors read out by a dedicated fast-integrated electronics of several hundreds of channels.

scholarly journals Enhanced Resolution from Full-Field Ptychography with an Electron Microscope Pixel Array Detector

2017 ◽  
Vol 23 (S1) ◽  
pp. 438-439
Author(s):  
Yi Jiang ◽  
Yimo Han ◽  
Zhen Chen ◽  
Veit Elser ◽  
David A. Muller
Keyword(s):  
Electron Microscope ◽  
Array Detector ◽  
Full Field ◽  
Enhanced Resolution ◽  
Pixel Array ◽  
Pixel Array Detector
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