Earth occultation or coded mask?
نویسندگان
چکیده
منابع مشابه
Sensitivity of coded mask telescopes.
Simple formulas are often used to estimate the sensitivity of coded mask x-ray or gamma-ray telescopes, but these are strictly applicable only if a number of basic assumptions are met. Complications arise, for example, if a grid structure is used to support the mask elements, if the detector spatial resolution is not good enough to completely resolve all the detail in the shadow of the mask, or...
متن کاملThe sensitivity of coded mask telescopes
Simple formulae are often used to estimate the sensitivity of coded mask X-ray or gamma-ray telescopes, but these are strictly only applicable if a number of basic assumptions are met. Complications arise, for example, if a grid structure is used to support the mask elements, if the detector spatial resolution is not good enough to completely resolve all the detail in the shadow of the mask or ...
متن کاملThe Burst and Transient Source Experiment (batse) Earth Occultation Catalog of Low-energy Gamma-ray Sources Short Title: Batse Earth Occultation Catalog
The Burst and Transient Source Experiment (BATSE), aboard the Compton Gamma Ray Observatory (CGRO), provided a record of the low-energy gamma-ray sky (∼20-1000 keV) between 1991 April and 2000 May (9.1y). BATSE monitored the high energy sky using the Earth occultation technique (EOT) for point sources whose emission extended for times on the order of the CGRO orbital period (∼92 min) or greater...
متن کاملCoded Mask Imagers when to use them – and when not
Coded mask imagers are among a class of high energy astronomical instruments in which spatial or temporal coding, or a combination of the two, allows ‘multiplexing’ of the detection process. In this way many ‘pixels’ of an image can be observed and measured simultaneously. In certain circumstances this gives an advantage in signal to noise ratio, compared with an alternative approach in which e...
متن کاملCoded mask imaging of extended sources with Gaussian random fields
A novel method for generating coded mask patterns based on Gaussian random fields (GRF) is proposed. In contrast to traditional algorithms based on cyclic difference sets, it is possible to construct mask patterns that encode a predefined point spread function (PSF). The viability of this approach and the reproducibility of the PSFs is examined, together with studies on the mean transparency, p...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Nature
سال: 1994
ISSN: 0028-0836,1476-4687
DOI: 10.1038/368698a0