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Terahertz power calibration using absolute reference calorimeter
Author(s) -
Iida Hitoshi,
Kinoshita Moto,
Amemiya Kuniaki,
Tojima Yuya
Publication year - 2019
Publication title -
ieej transactions on electrical and electronic engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.254
H-Index - 30
eISSN - 1931-4981
pISSN - 1931-4973
DOI - 10.1002/tee.22929
Subject(s) - thermopile , calibration , calorimeter (particle physics) , terahertz radiation , electricity meter , power (physics) , measurement uncertainty , noise (video) , electrical engineering , materials science , optics , physics , optoelectronics , nuclear engineering , engineering , computer science , infrared , detector , quantum mechanics , artificial intelligence , image (mathematics)
Here, we demonstrate an accurate terahertz (THz) power calibration toward tens of nanowatt levels at room temperature. A power reference standard based on a calorimeter with extremely low noise is realized by introducing vacuum insulation panels utilized for thermal insulation. The standard provides a measurement capability of 26.7 nW with the expanded uncertainty of 4.2% ( k = 2) at 1 THz. The direct‐comparison calibration of a commercially available power meter is performed by considering its detectable power levels using the standard. A thermopile‐type power meter is used as the device under test, and its calibration factors are determined at 1 and 1.5 THz over a power‐level range of 0.66–1.56 µW. We evaluate the measurement uncertainties of the calibration and find a relative expanded uncertainty of 4.8–9.0% ( k = 2). © 2019 Institute of Electrical Engineers of Japan. Published by John Wiley & Sons, Inc.