Overview: A Spectroscopy "Performance Estimation Tool"
(SPEC-PET). For user configured Spitzer/IRS observing
parameters, the SPEC-PET returns an estimate of the instrument
sensitivity and an estimate of the signal-to-noise for user supplied
source continuum flux density, wavelength. For MIPS SED mode,
sensitivities are returned at 60, 75 and 90 microns.
Input: choose IRS module, ramp
duration, number of cycles, and wavelength for sensitivity
output. Configure MIPS SED exposure time and number of cycles.
Output: sensitivity and signal-to-noise for
the selected observing mode and wavelength, and user specified source
Warning: For each cycle of the IRS Staring mode AOT, two
exposures are obtained. The sensitivity quoted here assumes that
both exposures have been combined, and that the sensitivity of
the combined image has scaled as 1/sqrt(2) times the sensitivity
of the individual images. Similarly, for multiple cycles, the
sensitivity quoted assumes that the sensitivity of the combined
image has scaled as the 1/(square root of the number of
cycles). n.b. The sensitivities given in the SOM (section
188.8.131.52) are for a single exposure.