Hitoshi Iida, Moto Kinoshita, Kuniaki Amemiya, Yuya Tojima
https://onlinelibrary.wiley.com/doi/abs/10.1002/tee.22929?af=R
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.
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