A method to determine the calorimetric equivalence correction for a coaxial microwave microcalorimeter

Experimental Method to Determine the Thermal Isolation Line Effect on the Efficiency of the Bolometer Mount in a Microcalorimeter

“…1) [2]. Nevertheless, the different loss paths for DC and RF powers in the mount itself require one other corrective factor inside the classical formula (1) [3].…”

“…Nevertheless, the different loss paths for DC and RF powers in the mount itself require one other corrective factor inside the classical formula (1) [3]. The coefficient a could be detennined by the analytical method [4] or some indirect measurement of the isolation line attenuation [2]. For the analytical method, certain theoretical hypothesis is necessary on the heat contribution along the isolation line as well as its thermal behaviour against the heat sink in the microcalorimeter [4].…”

“…For the analytical method, certain theoretical hypothesis is necessary on the heat contribution along the isolation line as well as its thermal behaviour against the heat sink in the microcalorimeter [4]. Indeed, for all indirect evaluation one needs to measure the RF attenuation of the isolation line for the applied frequency [2]. So, these additional conditions or measurements increase the total uncertainty of the effective efficiency.…”

Validation of RF power standard in the frequency range of 100 MHz to 18 GHz by an inter laboratory data comparison

“…The coaxial microcalorimeter system has been established at NPLI since 1994. In the microcalorimeter, the total RF power dissipated in the thermistor mount and the dcsubstituted power in the mount are measured simultaneously to determine the effective efficiency of the thermistor mount [1][2][3][4][5]. This is the key technique for the realization of a RF power primary standard and its traceability is obtained through the determination of effective efficiency of the thermistor mounts as a function of frequency.…”

A new 50 GHz coaxial DC-substitution microwave bolometer

“…DC-substitution bolometry has been the standard for low-power (10 μW to 10 mW) RF power, used as national standards [1,2], and working sensors [3] when the lowest uncertainty measurement is required.…”