Precision of quasi-optical null-balanced bridge techniques for transmission and reflection coefficient measurements

Hadjiloucas, S. ORCID: https://orcid.org/0000-0003-2380-6114 and Bowen, J. W. (1999) Precision of quasi-optical null-balanced bridge techniques for transmission and reflection coefficient measurements. Review of Scientific Instruments, 70 (1). 213. ISSN 0034-6748 doi: 10.1063/1.1149568

Abstract/Summary

The precision of quasioptical null-balanced bridge instruments for transmission and reflection coefficient measurements at millimeter and submillimeter wavelengths is analyzed. A Jones matrix analysis is used to describe the amount of power reaching the detector as a function of grid angle orientation, sample transmittance/reflectance and phase delay. An analysis is performed of the errors involved in determining the complex transmission and reflection coefficient after taking into account the quantization error in the grid angle and micrometer readings, the transmission or reflection coefficient of the sample, the noise equivalent power of the detector, the source power and the post-detection bandwidth. For a system fitted with a rotating grid with resolution of 0.017 rad and a micrometer quantization error of 1 μm, a 1 mW source, and a detector with a noise equivalent power 5×10−9 W Hz−1/2, the maximum errors at an amplitude transmission or reflection coefficient of 0.5 are below ±0.025.

Item Type	Article
URI	https://reading-clone.eprints-hosting.org/id/eprint/18898
Item Type	Article
Refereed	Yes
Divisions	Life Sciences > School of Biological Sciences > Department of Bio-Engineering
Publisher	AIP
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