Abstract
The practical standard in high temperature is maintained by tungsten strip lamps. In the past to use these lamps as standard, it was necessary to calibrate these lamps with other radiance sources using an intermediate instrument, the optical pyrometer. But the accuracy of an optical pyrometer is limited and insufficient for calibration; especially this instrument is not adequate for the calibration of blackbody furnaces. And the limitations impede the establishment of traceability of standard for commercial radiation thermometers.
This pyrometer is on trial to remove the limitations of an optical pyrometer. This pyrometer adopts a silicon photocell as detector and operates with monochromatic light by an interference filter (λmax=0.649μm, Δλ=18nm) so as to calibrate the photocell directly to the tungsten strip, the effective wavelength of this pyrometer corresponds approximately to that of a lamp.
The luminance temperature range is 1000°C to 2000°C with a resolution of 0.1°C and the stability is 0.2°C/month. This pyrometer may be useful as practical standard instrument.
