E Usadi, NPL Low Temperature Blackbody for CAVIAR: Characterisation & Calibration Eric Usadi Thanks to Chris Price Theo Theocharous Title E Usadi 02Jun08

E Usadi, NPL blackbody description traceability chain calibration & validation plan E Usadi 02Jun08

E Usadi, NPL blackbody description traceability chain calibration & validation Blackbody short description E Usadi 02Jun08

E Usadi, NPL Uniqueness UNIQUE CALIBRATION TOOLS CAVIAR blackbody in-air (i.e. non-vacuum) temperature range time response aperture size emissivity calibrated & characterised IR filter radiometer world leading infrared FR enables traceability E Usadi 02Jun08

E Usadi, NPL CAVIAR blackbody Blackbody schematic (not to scale) ethanol in LN 2 insulation PRT s fluid heater/chiller & circulator (sealed system) -60 o C to +30 o C heat exchanger E Usadi 02Jun08

E Usadi, NPL Copper parts E Usadi 02Jun08

E Usadi, NPL Copper parts E Usadi 02Jun08

E Usadi, NPL blackbody description traceability chain calibration & validation Traceability chain E Usadi 02Jun08

E Usadi, NPL Traceability schematic Cryogenic radiometer High emissivity BB Ga fixed point) CBB TAFTSAries IR filter radiometer IR filter Transmittance scale E Usadi 02Jun08

E Usadi, NPL Traceability schematic 2 Cryogenic radiometer High emissivity BB Ga fixed point) CBB TAFTSAries IR filter radiometer IR filter Transmittance scale E Usadi 02Jun08

E Usadi, NPL Calibration schematic High emissivity Gallium Melting Point (29.76 deg C) IR filter radiometer (4.7  m, et al) Low temperature blackbody E Usadi 02Jun08

E Usadi, NPL 4.7  m Temperature (K) Planck function Responsivity Uncertainty (%) (microns) Planck function Filter Radiometer Responsivity E Usadi 02Jun08

E Usadi, NPL Spectral Radiance slope E Usadi 02Jun08

E Usadi, NPL blackbody description traceability chain calibration & validation Calibration & validation E Usadi 02Jun08

E Usadi, NPL E Usadi 02Jun08

E Usadi, NPL 22May08 data Blackbody thermometer readings AMBER radiometer reading of reference blackbody (arb units) AMBER radiometer reading of low-temp blackbody E Usadi 02Jun08

E Usadi, NPL E Usadi 02Jun08

E Usadi, NPL Equation 6 E Usadi 02Jun08

E Usadi, NPL Equation 6 detail Planck function Filter radiometer responsivity measured at discrete ’s Signal from reference blackbody at Gallium Point Emissivities known by design & modelling Signal from CAVIAR blackbody 1) MEASURED 2) CALCULATED E Usadi 02Jun08

E Usadi, NPL E Usadi 02Jun08

E Usadi, NPL Uncertainty budget E Usadi 02Jun08

E Usadi, NPL Combined uncertainty E Usadi 02Jun08

E Usadi, NPL Conclusion E Usadi 02Jun08 Conclusions blackbody tested -60 to +30 deg C performance CALIBRATED & VALIDATED full uncertainty analysis unique characterisation of low-temp blackbody ready for ARIES & TAFTS……