Bright source limits of JWST's Mid-Infrared Instrument (MIRI) are predicted by a saturation model that uses measurements obtained during ground testing.
Parent page: MIRI Predicted Performance
The performance of MIRI has been measured directly at both the component and system level using the fully assembled MIRI flight model in a flight-like radiative environment with a well characterized radiometric source (Glasse et al. 2015). Results of these JWST throughput measurements have been integrated into a sensitivity model, which includes the following components: (1) background, (2) photon conversion efficiency (PCD), (3) encircled energy, and (4) detector performance (Pontoppidan 2016).
Tables 1 and 2, and Figure 1 show bright source limits assuming a five group integration. The values shown represent the fluxes at which the detector reaches 70% of the pixels' full-well capacity.
Table 1.MIRI imager bright source limits (for Ngroups = 5)
Table 2.MIRI imager subarray bright source limits (for Ngroups = 5)
Glasse, A. et al. 2015, PASP, 127, 686
Pontoppidan, K. 2016, Proc of SPIE, 9910, 16