Descent Imager/Spectral Radiometer (DISR)

DISR is the ..

This instrument will make a range of imaging and spectral observations using several sensors and fields of view. By measuring the upward and downward flux of radiation, the radiative balance (or imbalance) of the thick Titan atmosphere will be deduced. Solar sensors will measure the light intensity around the Sun due to scattering by aerosols in the atmosphere. This will permit the calculation of the size and number density of the suspended particles. Two imagers (one visible, one infrared) will observe the surface during the latter stages of the descent and, as the probe slowly spins, build up a mosaic of pictures around the landing site. There will also be a side-looking visible imager to get a horizontal view of the horizon and the underside of the cloud deck. For spectral measurements of the surface, the weak sunlight will be augmented by a lamp that will switch on shortly before landing.

Prof. Manuel Grande
Last updated: 11 June 2001