Comparison of two cryogenic radiometers by determining the absolute spectral responsivity of silicon photodiodes with an uncertainty of 0.02
Abstract
To substantiate the NPL primary standard cryogenic radiometer as an absolute instrument it has been compared with the cryogenic radiometer which was successfully used to determine the Stefan-Boltzmann constant. The comparison was carried out with an accuracy of better than 0.02-percent by the independent determination of the spectral responsivity of silicon photodiodes with each radiometer. Only a detector comprising a number of silicon photodiodes (a trap device) had the required stability to achieve the desired accuracy. Four trap devices were found to have near unity internal quantum efficiency, being self-consistent to within 0.01 percent.
- Publication:
-
Applied Optics
- Pub Date:
- November 1990
- DOI:
- 10.1364/AO.29.004686
- Bibcode:
- 1990ApOpt..29.4686F
- Keywords:
-
- Cryogenic Equipment;
- Photodiodes;
- Radiometers;
- Silicon Radiation Detectors;
- Quantum Efficiency;
- Spectral Resolution;
- Stefan-Boltzmann Law;
- Instrumentation and Photography;
- METROLOGY;
- DEFLECTORS;
- RADIOMETRY;
- PHOTODIODES;
- SILICON;
- RADIOMETERS