Publication Date:
2019-07-27
Description:
An RCA buried channel thinned 320 x 512 CCD has recently been put into operation as the detector on the blue side of a new double spectrograph used at the Cassegrain focus of the Hale 5.08 m telescope. The chip is used in a vacuum dewer at a temperature of -132 C. The readout noise over most of the chip is 46 electrons per pixel, but on one side of the device there are columns with readout noise three times as high as this. When used in a spectroscopic mode with an f/1.5 beam, the CCD shows interference pattterns with an amplitude of 5 to 20%. This pattern occurs most clearly above 5000 A. It appears to be stable and can be removed by using standard flat-field exposures. At signal levels of a few hundred electrons there are some charge transfer problems. The quantum efficiency between 4000 and 6500 is very high, and the efficiency at 3260 A is about 20% of that at 4200 A. Above 6500 A the sensitivity begins to drop steadily.
Keywords:
ELECTRONICS AND ELECTRICAL ENGINEERING
Type:
Solid state imagers for astronomy; June 10, 11, 1981; Cambridge, MA
Format:
text
Permalink
