Space Instruments
ISIR Specifications
Sensor Performance:
Spectral Bands*
  Cirrus detection/aerosol
  Cloud & surface temp
  Cloud & surface temp
  Precise thermal imaging

8.2 - 9.0 µ (MODIS 29)
10.3 - 11.3 µ (AVHRR 3 & MODIS 31)
11.5 - 12.5 µ (AVHRR 5 & MODIS 32)
8.0 - 12.5 µ
Dynamic Ranges 0 to 400 °K
Spatial resolution (IFOV) 0.9 mrad (240 meters on ground)
FOV 17 degrees
Optics 50 mm, f/0.73
Cryogenic Cooling None
Inflight calibration Multi-level, through the lens, real-time calibration
Physical Parameters:
Weight 25 lbs.
Size 9"L x 11"W x 22"H
Power 25 watts @ 28 volt DC
Data Rate Approx. 250 KBytes/sec.
* Spectral bands are selectable depending on mission.
AVHRR is the Advanced Very High Resolution Radiometer on the NOAA satellites. MODIS is the Moderate Resolution Imaging Spectrometer.


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Real-time Signal Processor

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.



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