2002
DOI: 10.1063/1.1505841
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Development of the imaging system of the balloon-borne gamma-ray telescope Máscara Codificada (MASCO)

Abstract: We report laboratory imaging results of a balloon-borne gamma-ray imaging telescope, Máscara Codificada ͑Portuguese for ''coded mask,''͒ designed to obtain high angular resolution ͑ϳ14 arcmin͒ images of the sky in the 50 keV-1.8 MeV energy range. The instrument incorporates a coded mask with an aperture pattern based on a 19ϫ19-element modified uniformly redundant array ͑MURA͒. This pattern belongs to a subclass of MURAs that are almost completely antisymmetrical for 90°rotations with respect to the lower-righ… Show more

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Cited by 7 publications
(7 citation statements)
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“…It is noteworthy, however, that in some wide-field applications the mask is so large that this scheme is not possible, and the ambiguity problem has to be dealt with in conjunction with other instrumental constraints. One possible way to avoid the ambiguity is to use a rotating mask (Cook et al 1984;Braga et al 2002). In this case, the center of rotation of the shadowgram in the PSDP will depend upon the source incoming direction and the ambiguity can be avoided by determining this center in the timing analysis of the recorded data.…”
Section: The Mask Patternmentioning
confidence: 99%
See 1 more Smart Citation
“…It is noteworthy, however, that in some wide-field applications the mask is so large that this scheme is not possible, and the ambiguity problem has to be dealt with in conjunction with other instrumental constraints. One possible way to avoid the ambiguity is to use a rotating mask (Cook et al 1984;Braga et al 2002). In this case, the center of rotation of the shadowgram in the PSDP will depend upon the source incoming direction and the ambiguity can be avoided by determining this center in the timing analysis of the recorded data.…”
Section: The Mask Patternmentioning
confidence: 99%
“…The MURAs have exactly the same imaging properties as the URAs and provide a much wider choice of patterns to instrument designs. Later, Braga et al (2002) noticed that a sub-class of MURAs have 90-degree symmetries, meaning that a 90-degree rotation of the mask produces an "antimask" with the exception of one single cell that remains closed. Imaging alternatively with mask and antimask can be an efficient way to subtract out systematic spatial variations in the background level across the detector plane (see section 7 and Braga et al (1991)).…”
Section: The Mask Patternmentioning
confidence: 99%
“…A 315 mm  275 mm Tungsten coded-mask with 1.3-mm side square cells (0.5-mm thick) will be placed 600 mm away from the detector to provide images with 7 0 30 00 angular resolution. The basic pattern of the mask will be a 139  139 Modified Uniformly Redundant Array (MURA - Gottesman and Fenimore, 1989;Braga et al, 2002), which will allow for full shadowgrams to be cast on the position-sensitive detector area and will provide no source ambiguity problems in the fully-coded field-of-view (FCFOV). A sketch of the CXD is shown in Fig.…”
Section: The Hard X-ray Camerasmentioning
confidence: 99%
“…For a point source, the reconstructed image is "perfect" in the sense that it produces a peak in an otherwise completely flat image (see Gottesman & Fenimore (1989) and Braga et al (2002) for details about imaging with MURAs). With this configuration, the protoMIRAX X-ray camera will have a total field-of-view of 20…”
Section: The Coded Maskmentioning
confidence: 99%