SYMPOSIA PAPER Published: 01 January 2003

Calibration of a Heat Flux Sensor up to 200 kW/m in a Spherical Blackbody Cavity


This paper presents the results of a comparative study of narrow view-angle and wide view-angle calibrations of a water-cooled Schmidt-Boelter heat-flux sensor. The narrow view-angle calibration, up to a heat flux level of 50 kW/m2, was conducted using the 25 mm Variable Temperature Blackbody (VTBB) facility. An electrical substitution standard was used as a transfer standard to determine the flux level at the sensor plane. The wide view-angle calibration was conducted by placing the sensor inside the radiating cavity of a spherical blackbody. The calibration in the spherical blackbody is based on the heat-flux derived from the Stefan-Boltzmann equation using the blackbody temperature measured from a type-S thermocouple. The calibration covered an extended range from 50 kW/m2 to 200 kW/m2. Results of the calibration of the heat-flux sensor using the two different techniques are presented. A discussion of the problems associated with calibrating sensors at high heat-flux levels by inserting the sensor inside a blackbody cavity is also presented.

Author Information

Murthy, AV
Aero-Tech, Inc., Hampton, VA
Tsai, BK
Optical Technology Division, NIST, Gaithersburg, MD
Saunders, RD
Saunders Enterprises, Gaithersburg, MD
Price: $25.00
Contact Sales
Reprints and Permissions
Reprints and copyright permissions can be requested through the
Copyright Clearance Center
Developed by Committee: E05
Pages: 51–66
DOI: 10.1520/STP10948S
ISBN-EB: 978-0-8031-5477-3
ISBN-13: 978-0-8031-3451-5