Effects of impedance mismatch and coaxial cable length on absolute gravimeters

Kód výsledku v 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>

Výsledek na webu

<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>

Jazyk výsledku

angličtina

Název v původním jazyce

Effects of impedance mismatch and coaxial cable length on absolute gravimeters

Popis výsledku v původním jazyce

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.

Název v anglickém jazyce

Effects of impedance mismatch and coaxial cable length on absolute gravimeters

Popis výsledku anglicky

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.

Druh

J_x - Nezařazeno - Článek v odborném periodiku (Jimp, Jsc a Jost)

CEP obor

DE - Zemský magnetismus, geodesie, geografie

OECD FORD obor

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Projekt

<a href="/cs/project/GA16-14105S" target="_blank" >GA16-14105S: Pokročilé zpracování absolutních tíhových měření a výzkum systematických přístrojových vlivů</a><br>

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Rok uplatnění

2017

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Metrologia

ISSN

0026-1394

e-ISSN

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Svazek periodika

54

Číslo periodika v rámci svazku

2

Stát vydavatele periodika

GB - Spojené království Velké Británie a Severního Irska

Počet stran výsledku

10

Strana od-do

161-170

Kód UT WoS článku

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EID výsledku v databázi Scopus

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