The sensitivity model for the JWST Mid-Infrared Instrument (MIRI) uses ground testing measurements and incorporated into a full sensitivity model that includes parameters such as background, photon conversion efficiency, encircled energy and detector performance.
The performance of JWST 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). The results of the JWST throughput measurements have been integrated into a sensitivity model which includes the following components: (1) background, (2) photon conversion efficiency (PCE), (3) encircled energy, (4) and detector performance (Pontoppidan 2016).
Table 1. S/N=10 in 10^4 s for the MIRI imaging filters
|Filter||Low-background detection limit (μJy)|
Pontoppidan, K. 2016, Proc of SPIE, 9910, 16
Pandeia: a multi-mission exposure time calculator for JWST and WFIRST