Aperture Proximity Effects in High Heat Flux Sensors Calibration
A V Murthy1, B K Tsai2, R D Saunders2
1Aero-Tech, Inc., Hampton, VA 23666.
Summary
A correction method is presented for heat flux sensor transfer calibration when sensor areas differ. This accounts for irradiance distribution, improving calibration accuracy for sensors with varying sizes.
Area of Science:
- Metrology
- Heat Transfer Science
- Sensor Technology
Background:
- Transfer calibration of heat flux sensors is crucial for accurate measurements.
- Differences in sensing areas between reference and test sensors can introduce errors.
- Irradiance distribution across sensor surfaces is a key factor in calibration accuracy.
Purpose of the Study:
- To present a method for calculating correction factors in heat flux sensor transfer calibration.
- To address the challenge of differing sensor sensing areas during calibration.
- To provide estimates of these corrections under specific National Institute of Standards and Technology (NIST) test conditions.
Main Methods:
- Utilizing established equations for configuration factors to model irradiance distribution.
- Developing a calculational method for correction factors based on sensor geometry.
- Applying the method to typical transfer calibration scenarios at NIST.
Main Results:
- A quantifiable method to correct for irradiance distribution differences is demonstrated.
- Correction estimates are provided for specific NIST transfer calibration test conditions.
- The study validates the necessity and calculation of these corrections.
Conclusions:
- The presented method provides a robust way to correct for irradiance distribution in heat flux sensor transfer calibration.
- Accurate calibration is achievable even with sensors of different sensing areas.
- This work contributes to improved metrology standards for heat flux measurements.
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