In vacuum UV band, especially in the domain around 100nm wavelength, MCP dominates the detector realm, such as the FUSE telescope (the Far Ultraviolet Spectroscopic Explorer), the working band of which is 90.5-119.5nm. In this paper, it is introduced our work of an attempt to build a CCD system with e2v’s enhanced no-coating device as the detector to test two vacuum UV band spectrographs, of which one works at 102-170nm band and another at 160-320nm. And the working band testing result of the CCD system is showed and the potential possibility to use CCD to detect far UV image is discussed.
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<sup>-</sup>
(50KHz) at -100°C working temperature. The system linearity is better than 99.99% and the full well is about 110027e<sup>-</sup>.
The horizontal and vertical CTE are 0.999993 and 0.999997, measured by Fe55 X-ray source and extended pixel edge
response (EPER) separately.
The scintillating fiber camera is a type of three-dimensional track detector. Using this camera, we can observe the scintillation track produced along the path of a charged particle, and from its scintillation yield can determine the linear energy transfer (LET) distribution of the charged particle. Such observations are also possible for recoil (charged) particles produced by fast neutrons. From these data, we can estimate the LET distribution of individual charged particles or that of recoil particles produced by neutrons; and finally, we can estimate the dose equivalent due to charged particles and/or fast neutrons. For use as a dosimeter for fast neutrons produced by the interaction between cosmic-ray particles and wall materials of a manned spaceship in space, a 52 mm cubic scintillating fiber camera with a 75 mmΦ gated-image intensifier with a maximum counting rate of 30 Hz was constructed. The dosimeter consists of a stack of scintillation fibers with a sensitive volume of 52 mm × 52 mm × 52 mm and a 75 mm diameter image intensifier for readout from the scintillation fibers. The scintillation yields were measured for high-energy heavy ions such as carbon and argon ions. An energy resolution of 12% full-width half-maximum (FWHM) was obtained for penetrated argon ions of 650 MeV/n. These results demonstrate that this type detector is very useful as a dosimeter for high-energy cosmic rays and their secondary neutrons.
A high speed CCD camera has been completed at the National Astronomical Observatories of China (NAOC). A Kodak
CCD was used in the camera. Two output ports are used to read out CCD data and total speed achieved 60M pixels per
second. The Kodak KAI-4021 image sensor is a high-performance 2Kx2K-pixel interline transfer device. The 7.4μ square
pixels with micro lenses provide high sensitivity and the large full well capacity results in high dynamic range. The
inter-line transfer structure provides high quality image and enables electronic shuttering for precise exposure control.
The electronic shutter provides a method of precisely controlling the image exposure time without any mechanical
components. The camera is controlled by a NIOS II family of embedded processors, which is Altera's second-generation soft-core
embedded processor for FPGAs. The powerful embedded processors make the camera with splendid features to satisfy
continuously appearing new observational requirements. This camera is very flexible and is easy to implement new
special functions. Since FPGA and other peripheral logic signals are triggered by a single master clock, the whole system is perfectly
synchronized. By using this technique the camera cuts off the noise dramatically.
A CCD camera system has been constructed and is in regular use at the Yunnan Observatory. A Texas Instruments-Japan 1024 X 1024 CCD is employed. The TI-Japan CCD is a virtual-phase with high quantum efficiency, 8 electrons rms readout noise, and excellent charge-transfer properties under low-level light. The CCD controller is designed to operate with multi-functions, the pixels of CCD can be binned into any format. The dewar is cooled by a three stage thermoelectronic device.