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How Stable is the Eppley PIR? ( Broadband Infrared Measurements) Joe - PowerPoint PPT Presentation

How Stable is the Eppley PIR? ( Broadband Infrared Measurements) Joe Michalsky (NOAA) and Emiel Hall (CIRES) Blackbody calibrations over 15 year period Eppley Precision Infrared Radiometer (PIR) U emf T 4 BB - T 4 B k hours k k hours


  1. How Stable is the Eppley PIR? ( Broadband Infrared Measurements) Joe Michalsky (NOAA) and Emiel Hall (CIRES)  Blackbody calibrations over 15 year period

  2. Eppley Precision Infrared Radiometer (PIR)

  3. U emf σT 4 BB - σT 4 B

  4. k hours

  5. k

  6. k hours

  7. k

  8. Conclusions  Eppley Precision Infrared Radiometers (PIRs) are very stable  The blackbody calibration technique we use is quite stable  PIRs can be used to detect long-term changes in downwelling infrared to about 0.5 Wm -2 even if the scale changes

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