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A calibration system of a 3.5 mm coaxial power sensor was implemented using transfer standards with 7 mm coaxial or K-band waveguide input connectors. A 7 mm-3.5 mm or WR42-3.5 mm adapter was used to form a combined transfer standard. The effective efficiency of the combined transfer standard was obtained. The 3.5 mm coaxial power sensor was calibrated using the well-known direct comparison method...
The design and correction factor evaluation of a WR-15 (50 to 75 GHz) rectangular waveguide microcalorimeter is presented. This new microcalorimeter will be the US national standard for power from 50 to 75 GHz. It can measure the effective efficiency of a wider variety of transfer standards than can the previous microcalorimeter. It has also been designed so that its correction factor can be experimentally...
The density of an isotopically enriched 28Si crystal is evaluated. A transfer standard of the hollow silicon cylinder is prepared and its density is determined by the hydrostatic weighing (HW). The 28Si crystal is then compared with the hollow silicon for the determination of the density by the pressure-of-flotation (PF) measurement.
In the present study, we introduce a wideband calibration method of electric field strength sensors by using a gigahertz transverse electromagnetic (GTEM) cell and a reference electric field sensor. A preliminary comparison shows good agreement between the proposed method and other ones. Another measurement result will be presented at the conference.
Optical fiber power meter (OFPM) linearity standards of NMIJ (Japan) and NIST (USA) are compared using a commercial OFPM as a transfer standard at 1310 nm and 1550 nm over a power range [-60 dBm, 0 dBm]. At both wavelengths the comparison indicates an agreement between the two laboratories within the combined uncertainty. At 1550 nm the uncertainties are larger, which is attributed to unstable operation...
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