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

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Jul 19, 2023 465 likes •653 views

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

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How Stable is the Eppley PIR? (Broadband Infrared Measurements)

Joe Michalsky (NOAA) and Emiel Hall (CIRES)

 Blackbody calibrations over 15 year period

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Eppley Precision Infrared Radiometer (PIR)

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σT4

BB-σT4 B

Uemf

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hours k

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hours k

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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