Ice accretion indicator-
An instrument used to detect the occurrence of freezing precipitation.
Ice nuclei counter-
Any of several devices for counting atmospheric particles that serve as heterogeneous ice nuclei that are suited by
composition to catalyze the formation of ice crystals in the atmosphere.
Infrared spectrometer-
An instrument often flown on a satellite that measures intensities of electromagnetic radiation at wavelengths within the infrared portion of the spectrum.
Interceptometer-
A rain gauge that is placed under trees or in foliage to determine the rainfall in that location. By comparing this catch with that from a rain gauge set in the open, the amount of rainfall that has been intercepted by foliage is determined.
