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The Optical Technology Division at NIST is developing techniques to calibrate heat-flux sensors to meet the current calibration needs of U.S. science and industry. An outcome of this effort is a calibration service offered now through NIST Calibration Services to calibrate heat-flux sensors up to 50 kW/m2. The calibration, performed using the 25 mm Variable-Temperature Blackbody as a broadband radiant source, transfers calibration from a primary electrical substitution radiometer standard to the heat-flux sensor. In contrast to other calibration methods using temperature traceability, the objective of this calibration is to provide heat-flux traceability to NIST primary standards. This report gives the calibration principle, the associated laboratory procedure, safety, and typical calibration results of a Schmidt-Boelter type heat-flux sensor.
Contents
- Cover/Table of Contents
- 1. Introduction
- 2. Measurement principle
- 3. Traceability
- 4. Calibration technique
- 4.1 25 mm Variable-Temperature Blackbody
- 4.2 Transfer Standard Radiometer
- 4.3 Radiometer Calibration
- 4.4 Reference Calibration Sensor
- 5. Calibration procedures
- 5.1 Pre-Calibration inspection
- 5.2 Additional test equipment
- 5.3 Calibration
- 5.4 Post-Calibration inspection
- 5.5 Data reduction
- 5.6 Calibration report
- 6. Measurement uncertainty
- 6.1 Transfer standard
- 6.2 Blackbody temperature (VTBB)
- 6.3 Blackbody emissivity
- 6.4 Blackbody radiation - aperture uniformity
- 6.5 Alignment error (distance)
- 6.6 Alingnment error (angular)
- 6.7 Radiometer aperture size
- 6.8 Radiometer/Sensor reading
- 6.9 Other sources
- 6.10 Combined uncertainty
- References
- Appendix A: Heat-flux sensor:
Laboratory procedure manuals
- Appendix B: Sample calibration
report
- Appendix C: Blackbody operation:
Laboratory procedure manuals
- Appendix D: How to request
calibration services
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The calibration and related measurement services of the National Institute of Standards and Technology (NIST) are intended to assist the makers and users of precision measuring instruments in achieving the highest possible levels of accuracy, quality, and productivity. NIST offers over 300 different calibrations, special tests, and measurement assurance services. These services allow customers to directly link their measurement systems to measurement systems and standards maintained by NIST. NIST offers these services to the public and private organizations alike. See the NIST Calibration Services Web Site for more information.