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

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Presentation on theme: "Traceability and Quality Control in a Radiation Thermometry Laboratory Frank Liebmann – Tom Kolat NCSLi 2011."— Presentation transcript:

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 © 2011 Fluke CalibrationNCSL - Liebmann – RT QC2

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 © 2011 Fluke CalibrationNCSL - Liebmann – RT QC3

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 © 2011 Fluke CalibrationNCSL - Liebmann – RT QC4

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 © 2011 Fluke CalibrationNCSL - Liebmann – RT QC5

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 © 2011 Fluke CalibrationNCSL - Liebmann – RT QC6

7 Traceability Flat-plate sources calibrated radiometrically –RT transfer standard: KT19II.82 KT19 calibrated in liquid bath blackbodies –Blackbody ε > –Modeled in STEEP3 –Blackbody Z-axis temperature uniformity profiled © 2011 Fluke CalibrationNCSL - Liebmann – RT QC7

8 Traceability © 2011 Fluke CalibrationNCSL - Liebmann – RT QC8

9 Traceability © 2011 Fluke CalibrationNCSL - Liebmann – RT QC9

10 Traceability Scheme © 2011 Fluke CalibrationNCSL - Liebmann – RT QC10

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 © 2011 Fluke CalibrationNCSL - Liebmann – RT QC11

12 Uncertainty Budget © 2011 Fluke CalibrationNCSL - Liebmann – RT QC12

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 © 2011 Fluke CalibrationNCSL - Liebmann – RT QC13

14 Quality Control - Blackbody Sources Cross check with a national laboratory Determination of cavity bottom uniformity Use of a hot-gas purge © 2011 Fluke CalibrationNCSL - Liebmann – RT QC14

15 Cross-Checks – Verification Blackbody Nominal Temperature (°C) Temperature Difference (K) NIST Uncertainty (K) AMF Uncertainty (K) Normal Equivalence LT LT LT LT MT MT HT HT HT HT HT © 2011 Fluke CalibrationNCSL - Liebmann – RT QC15

16 Cavity Uniformity © 2011 Fluke CalibrationNCSL - Liebmann – RT QC16

17 Hot Gas Purge © 2011 Fluke CalibrationNCSL - Liebmann – RT QC17

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 © 2011 Fluke CalibrationNCSL - Liebmann – RT QC18

19 Quality Control – Transfer Standard Size-of-Source Effect Alignment Long Term Stability History Transfer Standard Warm-up Time © 2011 Fluke CalibrationNCSL - Liebmann – RT QC19

20 Size-of-Source Effect 35 mm diameter aperture used Diameter based on testing © 2011 Fluke CalibrationNCSL - Liebmann – RT QC20

21 Alignment Three steps –Angular alignment (laser, aligns tripod head) –Z-axis alignment –X-Y alignment © 2011 Fluke CalibrationNCSL - Liebmann – RT QC21

22 Long Term Stability History © 2011 Fluke CalibrationNCSL - Liebmann – RT QC22

23 Transfer Standard Warm-up Time Time constant ~ 15 minutes © 2011 Fluke CalibrationNCSL - Liebmann – RT QC23

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 © 2011 Fluke CalibrationNCSL - Liebmann – RT QC24

25 Quality Control – Flat Plate Models 4180 and 4181 Reflected radiation ~ room temperature Scatter temperature controlled Calibration points below ambient © 2011 Fluke CalibrationNCSL - Liebmann – RT QC25

26 Calibrations below Ambient © 2011 Fluke CalibrationNCSL - Liebmann – RT QC26

27 Calibration Geometry © 2011 Fluke CalibrationNCSL - Liebmann – RT QC27

28 Particulates (Dust) © 2011 Fluke CalibrationNCSL - Liebmann – RT QC28

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 © 2011 Fluke CalibrationNCSL - Liebmann – RT QC29

30 Conclusion Establishment of quality in radiation thermometry calibration Blackbody cavities Transfer standards Flat-Plate calibrations © 2011 Fluke CalibrationNCSL - Liebmann – RT QC30


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