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An improved design and simplified evaluation technique for waveguide microcalorimeter is presented in this paper. The design is based on a traditional twin-line microcalorimeter for calibrating thermistor mounts but with a proposed novel modification. In the improved design, another thermistor is added to measure the temperature change of the thermal isolation waveguide section. A simplified evaluation...
We have designed and measured WR28 calorimeter which will be used as national primary power standard frequency range is 26.5–40GHz. The detail of design and measurement results was published in 2010CPEM and 74th ARFTG[1][2]. At present, the effective efficiency of WR-28 calorimeter was calculated and some uncertainty evaluations were done.
We have designed and manufactured a new WR-28 (26.5-40GHz) rectangular waveguide calorimeter. The former WR-28 calorimeter was setup during 1980s, many parts are not work, and especially the mount is not available. So the new calorimeter needed. The calorimeter is designed as twin line structure and put in two layers copper barrel. The outer one is temperature controlled to reduce the effect of the...
Three calorimeters are being developed as national primary power standards which cover frequency range is 18-26.5 GHz, 26.5-40 GHz and 40-60 GHz. The connectors are WR-42, WR28 and WR19. At present, WR-42 calorimeter has been assembled and some measurements done. The calorimeter is designed as twin line structure and put in two layers copper barrel. The outer one is temperature controlled to reduce...
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