Comparison Among Coaxial Microcalorimeter Models

TL;DR

This paper compares various models of coaxial microcalorimeters based on thermoelectric sensors, analyzing their uncertainties and limitations for high-frequency power measurement standards.

Contribution

It provides a comprehensive comparison of existing models, evaluating their accuracy and identifying their strengths and weaknesses in high-frequency applications.

Findings

Different models show varying levels of uncertainty.

Some models have limitations at higher frequencies.

The analysis highlights the most reliable models for specific conditions.

Abstract

Thermoelectric power sensors used as power transfer standards are promising devices for further enhancements of the microcalorimetric technique in the high frequency field. A coaxial microcalorimeter has been studied, based on thermoelectric power sensors, at Istituto Nazionale di Ricerca Metrologica (INRIM). In the literature, several models have been proposed, considering different calibration processes and error sources. Hereby we analyze these models in terms of total uncertainty for the 3.5 mm coaxial line case between 10 MHz and 26.5 GHz. Merits and limits of the models are highlighted.