PHT-32 intermediate brightness source calibration, Ghost images - not by optics, but by chopper, Time constants of Signal Transients after Flux Changes
the effects of detector transient behaviour on the pht32 photometry and spatial response pattern has to be accurately determined. the obtained calibration images will ultimately serve as the basis for the development of techniques to remove these effects from all pht32 observations, incl. the ghost image introduced by the saw-tooth chopping mode on bright sources. in conjunction with existing beam measurements (and vignetting measurements) the measurements will be used for the development of semi-empirical models for the detector behaviour in the pht32 context. such models would aim to describe the detector data for any combination of source and background brightnesses. the models would be the basic building block for the deconvolution of the non- linear detector response from illumination and would be the essential step towards the deconvolution of the point spread function from the data.
Instrument
PHT22 , PHT32
Temporal Coverage
1998-03-07T11:13:39Z/1998-03-07T16:03:07Z
Version
1.0
Mission Description
The Infrared Space Observatory (ISO) was the world's first true orbiting infrared observatory. Equipped with four highly-sophisticated and versatile scientific instruments, it was launched by Ariane in November 1995 and provided astronomers world-wide with a facility of unprecedented sensitivity and capabilities for a detailed exploration of the Universe at infrared wavelengths.
European Space Agency, 2024, Pht-32 Intermediate Brightness Source Calibration Comma Ghost Images - Not By Optics Comma But By Chopper Comma Time Constants Of Signal Transients After Flux Changes, 1.0, European Space Agency, https://doi.org/10.5270/esa-bpk5402
