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Traceability and Quality Control in a Radiation Thermometry Laboratory

Traceability and Quality Control in a Radiation Thermometry Laboratory. Frank Liebmann – Tom Kolat NCSLi 2011. Outline. Traceability and Quality Control in a Radiation Thermometry Laboratory Introduction Traceability Traceability Scheme Uncertainty Budgets

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Traceability and Quality Control in a Radiation Thermometry Laboratory

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  1. Traceability and Quality Control in a Radiation Thermometry Laboratory Frank Liebmann – Tom Kolat NCSLi 2011

  2. Outline Traceability and Quality Control in a Radiation Thermometry Laboratory • Introduction • Traceability • Traceability Scheme • Uncertainty Budgets • Quality Control - Blackbody Sources • Cross-Checks – Verification • Cavity Uniformity • Hot Gas Purge • Quality Control – Transfer Standard Calibrations • Size-of-Source Effect • Alignment • Long Term Stability History • Transfer Standard Warm-up Time • Quality Control – Flat-Plate Calibrations • Calibrations below Ambient • Calibration Quality Control Steps • Conclusion NCSL - Liebmann – RT QC

  3. Outline Traceability and Quality Control in a Radiation Thermometry Laboratory • Introduction • Traceability • Traceability Scheme • Uncertainty Budgets • Quality Control - Blackbody Sources • Cross-Checks – Verification • Cavity Uniformity • Hot Gas Purge • Quality Control – Transfer Standard Calibrations • Size-of-Source Effect • Alignment • Long Term Stability History • Transfer Standard Warm-up Time • Quality Control – Flat-Plate Calibrations • Calibrations below Ambient • Calibration Quality Control Steps • Conclusion NCSL - Liebmann – RT QC

  4. Introduction • Fluke Calibration in American Fork, Utah • (formerly known as Hart Scientific) • 2005: Work began to establish a radiometric calibration program • Flat-plate radiation sources (IR calibrators) • Transfer standard calibration • Blackbody Cavities • Steps taken for quality control NCSL - Liebmann – RT QC

  5. Learning Objectives • Steps taken to assure quality in any calibration program • especially one involving radiation thermometry • Foster ideas on how to apply these ideas to a calibration laboratory NCSL - Liebmann – RT QC

  6. Outline Traceability and Quality Control in a Radiation Thermometry Laboratory • Introduction • Traceability • Traceability Scheme • Uncertainty Budgets • Quality Control - Blackbody Sources • Cross-Checks – Verification • Cavity Uniformity • Hot Gas Purge • Quality Control Measures – Transfer Standard Calibrations • Size-of-Source Effect • Alignment • Long Term Stability History • Transfer Standard Warm-up Time • Quality Control Measures – Flat-Plate Calibrations • Calibrations below Ambient • Calibration Quality Control Steps • Conclusion NCSL - Liebmann – RT QC

  7. Traceability • Flat-plate sources calibrated radiometrically • RT transfer standard: KT19II.82 • KT19 calibrated in liquid bath blackbodies • Blackbody ε > 0.999 • Modeled in STEEP3 • Blackbody Z-axis temperature uniformity profiled NCSL - Liebmann – RT QC

  8. Traceability NCSL - Liebmann – RT QC

  9. Traceability NCSL - Liebmann – RT QC

  10. Traceability Scheme NCSL - Liebmann – RT QC

  11. Uncertainty Budget • 4 Uncertainty Budgets • 4180, 4181 Calibrations (2 flat-plate models) • KT19 (Radiometric transfer standard) • TRT (cross check with NMI) • Original UCB followed traditional contact UCB • 2008: BIPM CCT-WG5 • Uncertainty Budgets for Calibration of Radiation Thermometers below the Silver Point NCSL - Liebmann – RT QC

  12. Uncertainty Budget NCSL - Liebmann – RT QC

  13. Outline Traceability and Quality Control in a Radiation Thermometry Laboratory • Introduction • Traceability • Traceability Scheme • Uncertainty Budgets • Quality Control - Blackbody Sources • Cross-Checks – Verification • Cavity Uniformity • Hot Gas Purge • Quality Control – Transfer Standard Calibrations • Size-of-Source Effect • Alignment • Long Term Stability History • Transfer Standard Warm-up Time • Quality Control – Flat-Plate Calibrations • Calibrations below Ambient • Calibration Quality Control Steps • Conclusion NCSL - Liebmann – RT QC

  14. Quality Control - Blackbody Sources • Cross check with a national laboratory • Determination of cavity bottom uniformity • Use of a hot-gas purge NCSL - Liebmann – RT QC

  15. Cross-Checks – Verification NCSL - Liebmann – RT QC

  16. Cavity Uniformity NCSL - Liebmann – RT QC

  17. Hot Gas Purge NCSL - Liebmann – RT QC

  18. Outline Traceability and Quality Control in a Radiation Thermometry Laboratory • Introduction • Traceability • Traceability Scheme • Uncertainty Budgets • Quality Control - Blackbody Sources • Cross-Checks – Verification • Cavity Uniformity • Hot Gas Purge • Quality Control – Transfer Standard Calibrations • Size-of-Source Effect • Alignment • Long Term Stability History • Transfer Standard Warm-up Time • Quality Control – Flat-Plate Calibrations • Calibrations below Ambient • Calibration Quality Control Steps • Conclusion NCSL - Liebmann – RT QC

  19. Quality Control – Transfer Standard • Size-of-Source Effect • Alignment • Long Term Stability History • Transfer Standard Warm-up Time NCSL - Liebmann – RT QC

  20. Size-of-Source Effect • 35 mm diameter aperture used • Diameter based on testing NCSL - Liebmann – RT QC

  21. Alignment • Three steps • Angular alignment (laser, aligns tripod head) • Z-axis alignment • X-Y alignment NCSL - Liebmann – RT QC

  22. Long Term Stability History NCSL - Liebmann – RT QC

  23. Transfer Standard Warm-up Time • Time constant ~ 15 minutes NCSL - Liebmann – RT QC

  24. Outline Traceability and Quality Control in a Radiation Thermometry Laboratory • Introduction • Traceability • Traceability Scheme • Uncertainty Budgets • Quality Control - Blackbody Sources • Cross-Checks – Verification • Cavity Uniformity • Hot Gas Purge • Quality Control – Transfer Standard Calibrations • Size-of-Source Effect • Alignment • Long Term Stability History • Transfer Standard Warm-up Time • Quality Control – Flat-Plate Calibrations • Calibrations below Ambient • Calibration Quality Control Steps • Conclusion NCSL - Liebmann – RT QC

  25. Quality Control – Flat Plate • Models 4180 and 4181 • Reflected radiation ~ room temperature • Scatter temperature controlled • Calibration points below ambient NCSL - Liebmann – RT QC

  26. Calibrations below Ambient NCSL - Liebmann – RT QC

  27. Calibration Geometry NCSL - Liebmann – RT QC

  28. Particulates (Dust) NCSL - Liebmann – RT QC

  29. Outline Traceability and Quality Control in a Radiation Thermometry Laboratory • Introduction • Traceability • Traceability Scheme • Uncertainty Budgets • Quality Control - Blackbody Sources • Cross-Checks – Verification • Cavity Uniformity • Hot Gas Purge • Quality Control – Transfer Standard Calibrations • Size-of-Source Effect • Alignment • Long Term Stability History • Transfer Standard Warm-up Time • Quality Control – Flat-Plate Calibrations • Calibrations below Ambient • Calibration Quality Control Steps • Conclusion NCSL - Liebmann – RT QC

  30. Conclusion • Establishment of quality in radiation thermometry calibration • Blackbody cavities • Transfer standards • Flat-Plate calibrations NCSL - Liebmann – RT QC

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