Effects of impedance mismatch and coaxial cable length on absolute gravimeters

Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00177016%3A_____%2F17%3AN0000002" target="_blank" >RIV/00177016:_____/17:N0000002 - isvavai.cz</a>
Result on the web
<a href="http://iopscience.iop.org/article/10.1088/1681-7575/aa5ba1" target="_blank" >http://iopscience.iop.org/article/10.1088/1681-7575/aa5ba1</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/https://doi.org/10.1088/1681-7575/aa5ba1" target="_blank" >https://doi.org/10.1088/1681-7575/aa5ba1</a>

Result language
angličtina
Original language name
Effects of impedance mismatch and coaxial cable length on absolute gravimeters
Original language description
Systematic effects of absolute gravimeters have to be investigated to fully utilize the capabilities of absolute gravimeters in metrology and geosciences. In Křen et al (2016 Metrologia 53 27–40) we found that for a FG5 gravimeter even a few meter long coaxial cables used for transmission of fringe signal cause systematic features in residuals and errors at the level of 1-2 µGal. In this paper we present experimental results and appropriate models for explanation of these effects that were found to be caused by impedance mismatches of electronic components and dispersion effects in coaxial cables of gravimeters. The experimental results have been obtained for analogue and TTL signals in the FG5-215 gravimeter and for a TTL signal in the FG5X-251 gravimeter as well. We found that dispersion and impedance mismatch effects are similar for both gravimeters. Further, we describe a model of the dispersion that allows an evaluation of the effect/correction for a given range of the free-fall and thus it is also applicable to other gravimeters. The effect of impedance mismatch for the analogue fringe signal is modelled as an effect of the reflected electronic signal on the evaluation of zero-crossings. The applicability of this model for TTL signal is also discussed.
Czech name
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Czech description
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Type
J<sub>x</sub> - Unclassified - Peer-reviewed scientific article (Jimp, Jsc and Jost)
CEP classification
DE - Earth magnetism, geodesy, geography
OECD FORD branch
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Project
<a href="/en/project/GA16-14105S" target="_blank" >GA16-14105S: Advanced processing of absolute gravity measurements and investigation of systematic instrumental effects</a><br>
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year
2017
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

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