Research Detectors LLC

Large Area CMOS X-ray Detectors


RDI’s CMOS_2M system uses a single large CMOS sensor to create a continuous image area 153 mm x 102 mm with 1.6 million pixels. Each pixel has an active area of 99 mm2. Scattered x-rays from the sample are converted into visible light with a Gd2O2S:Tb phosphor screen and the light is then transferred to the CMOS sensor with a thin fiber optic plate. 

With this sensor the individual pixels can be readout while all the other pixels are acquiring data. The total read time for a complete frame is only 0.05 seconds. This allows the imaging system to be used without a shutter. The system can be used for shutter less crystallography of small molecules in which a series of images are collected as the sample is smoothly rotated through 180 deg. Each frame records a 0.1 deg rotation of the crystal. With a laboratory x-ray system an exposure time of 1-5 seconds is used while at a synchrotron 0.1-0.2 seconds is used.

The system can also be used for rapid, precise centering of a sample in an experiment and for rapid evaluation of crystal quality. The detector is read using a 1G Ethernet link into a fast PC. Control software is supplied and data collected can be directly analyzed with standard analysis programs.

Here are the detailed specifications for the CMOS_2M system.

                       Feature                                    Specification
Active area (mm2) 153 x 102
Image size in pixels 1548 x 1032 pixels (1.6 x million pixels)
Pixel size (microns)
99 x 99
Phosophor (optimized for 1 Angstrom) Gd2O2S:Tb phosophor plate
Detector window Aluminized mylar or Beryllium
Spatial Resolution (FWHM) microns 99
Dark current (e/pixel/sec) 1
Read noise (electrons) 175
Signal from one 12 keV photon (electrons)
Maximum counting rate per pixel
90,000 photons/pixel/sec (12 keV x-ray)
Detector operating temperature (deg C)
0 deg
Cooling type
Internal thermoelectric with external water chiller
Readout time (sec)
0.05 (simultaneous readout and acquisition)
Dimensions (cm)
40 wide x 18 high x 4.4 thick (16" x 7" x 1.75")
Weight (kg)
5.5 (12 lbs)
Detector to PC interface
1 GigE Ethernet interface using TCP/IP
PC Computer system
16 Gybyte Intel system using Windows 8

The system comes with the detector, water chiller, power supplies, computer and software. Delivery is 60 days and the warranty is for one year (parts and labor). For further information please email us from the contact page or call us at 510-409-6031.