This paper describes the design of CCD camera that is part of the EUV detector to be used in Space Solar Telescope. It will run at the solar synchronous circular orbit with 735 km height. In this paper, a CCD camera is designed composed of the CCD sensor module, the analog system and the embedded controller with an NIOSII soft-core processor based on FPGA. The analog system is first introduced in detail including power and bias voltage supply circuit, 16 bit A/D converter, power protecting circuit, amplifier circuit, and CCD driving clocks generation circuit. NIOS II embedded system is then presented including system hardware and NIOS II processor. Finally, evaluation results of this camera are also presented including readout noise, gain, linearity, dynamic range and full well capacity.
National Astronomical Observatories of Chinese Academy of Sciences have successfully developed a universal
astronomical CCD controller, which is called Astronomical Array Control & Acquisition System (AACAS). It behaves
excellent performance and ultra low system noise. In this paper, results of E2V 4K×4K CCD203_82 characterization
using AACAS controller are presented and also the comparison with the specifications E2V supplied is given. It
concludes some important merits, such as dark current, readout noise, CTE and etc. The readout noise is smaller than 3e-
(50KHz) at -100°C working temperature. The system linearity is better than 99.99% and the full well is about 110027e-.
The horizontal and vertical CTE are 0.999993 and 0.999997, measured by Fe55 X-ray source and extended pixel edge
response (EPER) separately.
In the interest of expanding our ground-based observation to the infrared spectral range, we have built a short wave (SW)
infrared imaging system operating in 0.9-2.5μm. It is based on a commercial infrared focal plane array (IRFPA)
assembly from Sofradir, France. We have changed the cooling mode of this module from thermoelectric cooler (TEC) to
liquid nitrogen to further reduce the dark current of detector. A camera controller based on the soft-core embedded
processor and the relevant acquisition software has been also developed. This paper presents each part of the infrared
imaging system in detail and the preliminary results of testing and astronomical observation.
In this paper, the feasibility of CMOS imagers for astronomical application was evaluated as well as evaluation methods were studied. A camera based on IBIS5 CMOS sensor was built. Evaluation results of this sensor were also presented including readout noise, gain, linearity, dark current, full well capacity and pixel nonuniformity. Experimental observations of solar flare were carried out with Hα solar telescope in Huairou Solar Observation Station (HSOS), and the solar flare in NOAA AR0742 on March 13, 2005 was successfully observed with this IBIS5 CMOS camera. The results show a favorable aspect of the CMOS imager in large dynamic range astronomical imaging.
Dynamic range is a very important figure of merit to an imaging system in astronomy since it decides the range of brightness we can observe. This paper describes the design of a CMOS camera with extended dynamic range in which the CMOS sensor achieves high dynamic range by its dual slope response. We first established a model of how the dual slope response works, and gave a method to restore the image from dual slope response to linear response with the extended dynamic range. Then the data needed in the restoration to linear image was obtained in the laboratory by experiments using stable light source based on the model. At last the results of high dynamic range linear response images are shown using these experiment data.