- Author
- Murthy, A. V. | Tsai, B. K. | Saunders, R. D.
- Title
- Comparative Calibration of Heat Flux Sensors in Two Blackbody Facilities.
- Coporate
- Aero-Tech, Inc., Hampton, VA National Institute of Standards and Technology, Gaithersburg, MD
- Journal
- Journal of Research of the National Institute of Standards and Technology, Vol. 104, No. 5, 487-494, September/October 1999
- Report
- NIST SP 971, August 2001,
- Distribution
- For more information contact: Website: http://nvl.nist.gov/pub/nistpubs/jres/104/5/j45mur.pdf For More Information on NIST SP 971 visit: WEBSITE: http://www.bfrl.nist.gov/866/heatflux/index.htm
- Book or Conf
- NIST SP 971: "Collected Reports and Publications by the National Institute of Standards and Technology on Heat Flux Gage Calibration and Usage.", ['2001', '1999']
- Keywords
- heat flux | sensors | black body | calibration | irradiance | transfer calibration
- Abstract
- This paper presents the results of heat flux sensor calibrations in two blackbody facilities: the 25 mm variable temperature blackbody (VTBB) primary facility and a recently developed 51 mm aperture spherical blackbody (SPBB) facility. Three Schmidt-Boelter gages and a Gardon gage were calibrated with reference to an electrical substitution radiometer in the VTBB. One of the Schmidt-Boelter gates thus calibrated was used as a reference standard to calibrate other gages in the SPBB. comparison of the Schmidt-Boelter gages calibrations in the SPBB and the VTBB agreed within the measurement uncertainties. For the Gardon gage, the measured responsivity in the SPBB showed a gradual decrease with increasing distance from the aperture. When the gage was located close to the aperture, a distance less than the aperture radius, the responsivity in the SPBB agreed with VTBB measurements. At a distance of about three times the aperture radius, the responsivity showed a decrease of about 4%. This is probably due to higher convection loss from the Gardon gage surface compared to the Schmidt-Boelter sensor.