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APEX II CCD Detector
- APEX II CCD Detector
The APEX II CCD detector brings you improved CCD technology for structure elucidation on the widest variety of crystalline samples.
The APEX II is based on a brand new model of the largest scientific grade CCD chip manufactured - the Fairchild Imaging Systems 486 4K CCD (16 Mega Pixels). The only CCD which does not require a taper to achieve the active area required for crystallography.
Nano- and Micro-crystals or very weakly diffracting samples
(Requires a very sensitive, low-noise camera for superb signal to noise ratio)
| Highest sensitivity | 1:1 imaging on largest next generation scientific grade CCDchip |
| High gain scintillation screen | |
| Low noise | Lower CCD chip cooling |
| Optimized electronics | |
| Best point spread | Smaller spots for even better signal to-noise ratio |
Strongly diffracting samples – High throughput
(Requires a high dynamic range and fast read out detector for short data collection times)
| Fastest readout | 4 port; for up to 4 MHz total for sub second readout |
| 2 s frame to frame overhead | |
| High dynamic range | Next generation CCD Chip |
| Optimized electronic gain |
Thermal diffuse scattering experiments
(Require very long exposure times to detect weak diffuse scatter next to very intense Bragg reflections)
| Anti blooming | electronics prevent overflow of pixels |
| Ultra low readnoise | slower ultra low readnoise modes available |
| Low darknoise | Lower CCD chip cooling |
| High dynamic range | Next generation CCD Chip |
| optimized electronic gain | |
| lower binning modes | |
Mineralogical samples
(Require the determination of highly accurate unit cells)
| No spatial distortion | The large CCD chip does not require a fiberoptic taper used in traditional detector designs |
| Best spatial resolution | Optimized scintillation screen |
| New improved fiber optic face plate |
High pressure, solid state, charge density, absolute configuration of organics (Cu)…
Technical Specifications
| Sensor Type | Fairchild 486 4K CCD |
| Number of pixels | 4096 x 4096 |
| Active Area | 62 mm x 62 mm |
| CCD Pixel Size | 15μm x 15 μm |
| Demagnification Ratio | 1:1 |
| Typical Quantum Gain | 170 elektrons/X-ray photon (Mo) |
| Point Spread Function | FWHM: 75 μm |
| Readout Speed | 4 port; up to 4 MHz total |
| Signral-to-Noise for Single X-ray photon (Mo) | > 10:1 (SMART 1K detector 0.7:1) |
In the conventional CCD design, more than 90% of the photons from the scintillator are lost in the fiber optic taper. In the APEX II detector, 1:1 imaging improves the optical transmission by an order of magnitude - allowing data on yet smaller microcrystals or very weak diffractors. The APEX II has 15 times the sensitivity of the classic design.
- Conventional CCD Detector vs. APEX II
