title: Radiative Calibration of Heat-Flux Sensors at NIST: Facilities and Techniques.
abstract: We present an overview of the National Institute of Standards and Technology high temperature blackbodies, both in operation and in development, suitable for heat-flux sensor calibration. Typical results of calibrations using the transfer technique in the 25 mm Variable-Temperature Blackbody are presented to demonstrate the long-term repeatability of the calibration technique. A comparative study of the absolute and transfer calibrations of a Gardon gage in a spherical blackbody with a cooled enclosure surrounding the gage housing was conducted. Results of this study demonstrated the influence of convection associated with absolute calibration of sensors in a cooled enclosure. Plans for further development of the transfer technique to higher heat-flux levels and the associated technical issues are discussed.
authors.affiliation: Aero-Tech, Inc., Hampton, VA 2366.
authors.forename: A V
authors.initials: AV
authors.lastname: Murthy
authors.affiliation: National Institute of Standards and Technology, Gaithersburg, MD 20899-8441.
authors.forename: B K
authors.initials: BK
authors.lastname: Tsai
authors.affiliation: National Institute of Standards and Technology, Gaithersburg, MD 20899-8441.
authors.forename: R D
authors.initials: RD
authors.lastname: Saunders
keywords: blackbody; calibration; heat-flux; radiometer; sensor