Experiment with simultaneous measurements at two optical wavelengths in the FG5X absolute gravimeter

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00177016%3A_____%2F24%3AN0000001" target="_blank" >RIV/00177016:_____/24:N0000001 - isvavai.cz</a>

Result on the web

<a href="https://iopscience.iop.org/article/10.1088/1361-6501/ad1311/pdf" target="_blank" >https://iopscience.iop.org/article/10.1088/1361-6501/ad1311/pdf</a>

DOI - Digital Object Identifier

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Result language

angličtina

Original language name

Experiment with simultaneous measurements at two optical wavelengths in the FG5X absolute gravimeter

Original language description

The FG5X gravimeters are the most accurate commercially available absolute gravimeters at present. They traditionally use one optical wavelength in their interferometer to measure the gravity acceleration of the freely falling test mass in a vacuum. In this paper, for the first time, it is demonstrated the possibility to track the test mass simultaneously with two optical wavelengths of 633 nm and 771 nm and to evaluate the gravity acceleration from both these measurements. We show the technical solution, mathematical methods and error sources that have to be taken into account for the realization of simultaneous interferometric measurements. The achieved results show agreement of the gravity accelerations at the level of 2-4 microgals and increased low-frequency noise in residuals at 771 nm due to optical optimization of a gravimeter to the wavelength of 633 nm. We evaluated the sensitivity of gravity measurements to the used wavelength as a new contribution in the uncertainty budget that for the FG5X gravimeter reached 0.25 µGal and 2 µGal at wavelengths of 633 nm and 771 nm, respectively. Further, we discuss that the optimization of a gravimeter to a certain wavelength is related to the applied antireflective coating on the optical elements of the gravimeter among them the glass retroreflector plays the key role since its movements being dominant.

Czech name

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Czech description

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Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

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OECD FORD branch

10306 - Optics (including laser optics and quantum optics)

Project

<a href="/en/project/LTT19008" target="_blank" >LTT19008: Research related with International Gravity Reference System</a><br>

Continuities

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year

2024

Confidentiality

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

Name of the periodical

Measurement Science and Technology

ISSN

1361-6501

e-ISSN

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Volume of the periodical

35

Issue of the periodical within the volume

3

Country of publishing house

GB - UNITED KINGDOM

Number of pages

11

Pages from-to

035013

UT code for WoS article

001125672200001

EID of the result in the Scopus database

2-s2.0-85180357364