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SPI Coded Mask
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SPI Coded Mask

January 4, 2013
Date: 07 Jun 2000 Satellite: INTEGRAL Copyright: Photo courtesy INTA, Spain The hexagonal coded aperture mask of SPI is located 1.7 m above the detection plane in order to image large regions of the sky (fully coded field of view = 16 degrees) with an angular resolution of 2 degrees. The mask is made of 3 centimetre thick tungsten and consists of 127 hexagonal elements, of which 63 are opaque, 64 transparent.