No cooling means longer
life and higher reliability
Infrared Spectral Imaging Radiometer (ISIR) is a four-band imaging radiometer which utilizes an uncooled infrared microbolometer detector array to eliminate cryogenic cooling. Spectral bands can be selected for cloud radiation and/or earth mapping missions by means of an easily removable filter wheel. ISIR features a through-the-lens calibration system for highly calibrated radiometric measurements. ISIR operates in a pushbroom mode to eliminate mechanical scanning and reduce system complexity, weight and power.
Based on a prototype warm focal plane array detector, the first ISIR was built for NASA/GSFC and launched on August 7, 1997 aboard the shuttle Discovery as part of the STS-85 mission. ISIR operated successfully and produced a large quantity of the highest resolution thermal imagery ever obtained by NASA from space.