The Development Of The EMCCD Signal Acquisition System Used In Low-energy X-ray

Electron multiplying charge coupled device (EMCCD) is a glimmer CCD detecting device with the high-voltage multiplier electrode. Compared with the conventional CCD, because of higher sensitivity and lower noise, the EMCCD has been increasingly used in fields of detection and acquisition glimmer signal.Based on Hard X-ray Modulation Telescope which is a major national issue, EMCCD signal acquisition system of low-energy X-ray has been developed, in this paper the following results have been obtained.1. The sensitivity of detection has been improved by using the new glimmer detector to detect the weak signal. Compared to the conventional CCD detector, the EMCCD has the better energy resolution, especially in the low-energy of the x-rays, therefore it can detect the lower energy x-rays.2. The software for the EMCCD signal acquisition system has been designed, which is based on the FPGA platform of the Xilinx, driving schedules have been designed with hardware description language (VHDL), it has been implemented to drive the EMCCD.3. The hardware of the the EMCCD signal acquisition system has been designed and made, which includes the full investigation of the system requirement, the design and simulation of the electric circuits, the selection of components, and the creation of Printed circuit boards. The circuit has features as follows:(1) The USB2.0interface chip uses the CY7C68013to ensure the efficient and accurate transmission of the data.(2) The driving clock circuit uses the components, which successfully transform the driving voltages to the required value of the system.4. The EMCCD signal acquisition system has meet the requirement via the simulation in the software and the test of the downloading. The relevant data have been processed and analyzed by the oscilloscope with2.5GHz bandwidth and the MATLAB tool. The results show that spatial resolution of the system is superior to the original system, the images are clearer.