Precise measurement of CO 2 from space using Fabry-Perot based optical setup: current status and development

2006 ◽  
Author(s):  
E. Georgieva ◽  
E. Wilson ◽  
W. S. Heaps
Keyword(s):  
Precise Measurement ◽  
Current Status ◽  
Optical Setup ◽  
Fabry Perot

scholarly journals Understanding interferometry for micro-cantilever displacement detection

2016 ◽  
Vol 7 ◽  
pp. 841-851 ◽  
Author(s):  
Alexander von Schmidsfeld ◽  
Tobias Nörenberg ◽  
Matthias Temmen ◽  
Michael Reichling
Keyword(s):  
Precise Measurement ◽  
Systematic Approach ◽  
High Vacuum ◽  
Ultra High Vacuum ◽  
Relative Positioning ◽  
Optimum Conditions ◽  
Noise Spectral Density ◽  
Atomic Force ◽  
Fabry Perot ◽  
Micro Cantilever

Interferometric displacement detection in a cantilever-based non-contact atomic force microscope (NC-AFM) operated in ultra-high vacuum is demonstrated for the Michelson and Fabry–Pérot modes of operation. Each mode is addressed by appropriately adjusting the distance between the fiber end delivering and collecting light and a highly reflective micro-cantilever, both together forming the interferometric cavity. For a precise measurement of the cantilever displacement, the relative positioning of fiber and cantilever is of critical importance. We describe a systematic approach for accurate alignment as well as the implications of deficient fiber–cantilever configurations. In the Fabry–Pérot regime, the displacement noise spectral density strongly decreases with decreasing distance between the fiber-end and the cantilever, yielding a noise floor of 24 fm/Hz0.5 under optimum conditions.

scholarly journals The SPIRou wavelength calibration for precise radial velocities in the near infrared

2021 ◽  
Vol 648 ◽  
pp. A48
Author(s):  
M. J. Hobson ◽  
F. Bouchy ◽  
N. J. Cook ◽  
E. Artigau ◽  
C. Moutou ◽  
...  
Keyword(s):  
Hollow Cathode ◽  
Near Infrared ◽  
Wavelength Dependence ◽  
Radial Velocities ◽  
Current Status ◽  
Wavelength Calibration ◽  
Spectral Bands ◽  
Fabry Perot ◽  
Internal Error ◽  
Cavity Width

Aims. SPIRou is a near-infrared (nIR) spectropolarimeter at the CFHT, covering the YJHK nIR spectral bands (980−2350 nm). We describe the development and current status of the SPIRou wavelength calibration in order to obtain precise radial velocities (RVs) in the nIR. Methods. We make use of a UNe hollow-cathode lamp and a Fabry-Pérot étalon to calibrate the pixel-wavelength correspondence for SPIRou. Different methods are developed for identifying the hollow-cathode lines, for calibrating the wavelength dependence of the Fabry-Pérot cavity width, and for combining the two calibrators. Results. The hollow-cathode spectra alone do not provide a sufficiently accurate wavelength solution to meet the design requirements of an internal error of < 0.45 m s−1, for an overall RV precision of 1 m s−1. However, the combination with the Fabry-Pérot spectra allows for significant improvements, leading to an internal error of ∼0.15 m s−1. We examine the inter-night stability, intra-night stability, and impact on the stellar RVs of the wavelength solution.

scholarly journals Higgs-mass predictions in the MSSM and beyond

2021 ◽  
Vol 81 (5) ◽  
Author(s):  
P. Slavich ◽  
S. Heinemeyer ◽  
E. Bagnaschi ◽  
H. Bahl ◽  
M. Goodsell ◽  
...  
Keyword(s):  
Higgs Boson ◽  
Distinctive Feature ◽  
Higgs Mass ◽  
Precise Measurement ◽  
Current Status ◽  
Comprehensive Overview ◽  
The Standard Model ◽  
Supersymmetric Models ◽  
Theoretical Predictions ◽  
The Many

AbstractPredictions for the Higgs masses are a distinctive feature of supersymmetric extensions of the Standard Model, where they play a crucial role in constraining the parameter space. The discovery of a Higgs boson and the remarkably precise measurement of its mass at the LHC have spurred new efforts aimed at improving the accuracy of the theoretical predictions for the Higgs masses in supersymmetric models. The “Precision SUSY Higgs Mass Calculation Initiative” (KUTS) was launched in 2014 to provide a forum for discussions between the different groups involved in these efforts. This report aims to present a comprehensive overview of the current status of Higgs-mass calculations in supersymmetric models, to document the many advances that were achieved in recent years and were discussed during the KUTS meetings, and to outline the prospects for future improvements in these calculations.

scholarly journals Current status of space gravitational wave antenna DECIGO and B-DECIGO

2021 ◽  
Author(s):  
Seiji Kawamura ◽  
Masaki Ando ◽  
Naoki Seto ◽  
Shuichi Sato ◽  
Mitsuru Musha ◽  
...  
Keyword(s):  
Gravitational Wave ◽  
Gravitational Waves ◽  
Space Mission ◽  
Current Status ◽  
Fabry Perot ◽  
Primordial Gravitational Waves ◽  
Expansion Of The Universe ◽  
Black Hole Binary ◽  
Scientific Results ◽  
The Universe

Abstract Deci-hertz Interferometer Gravitational Wave Observatory (DECIGO) is the future Japanese space mission with a frequency band of 0.1 Hz to 10 Hz. DECIGO aims at the detection of primordial gravitational waves, which could be produced during the inflationary period right after the birth of the universe. There are many other scientific objectives of DECIGO, including the direct measurement of the acceleration of the expansion of the universe, and reliable and accurate predictions of the timing and locations of neutron star/black hole binary coalescences. DECIGO consists of four clusters of observatories placed in the heliocentric orbit. Each cluster consists of three spacecraft, which form three Fabry-Perot Michelson interferometers with an arm length of 1,000 km. Three clusters of DECIGO will be placed far from each other, and the fourth cluster will be placed in the same position as one of the three clusters to obtain the correlation signals for the detection of the primordial gravitational waves. We plan to launch B-DECIGO, which is a scientific pathfinder of DECIGO, before DECIGO in the 2030s to demonstrate the technologies required for DECIGO, as well as to obtain fruitful scientific results to further expand the multi-messenger astronomy.

Noise suppression for the precise measurement of Fabry-Perot cavity with wide tunable range

2014 ◽  
Author(s):  
Radek Smid ◽  
Martin Cizek ◽  
Bretislav Mikel ◽  
Jan Hrabina ◽  
Josef Lazar ◽  
...  
Keyword(s):  
Precise Measurement ◽  
Noise Suppression ◽  
Tunable Range ◽  
Fabry Perot

Cosmological Parameters from the 2dF Galaxy Redshift Survey

2005 ◽  
Vol 201 ◽  
pp. 158-167
Author(s):  
Matthew Colless
Keyword(s):  
Precise Measurement ◽  
Cosmological Parameters ◽  
Current Status ◽  
Low Density ◽  
Distortion Parameter ◽  
Preliminary Results ◽  
Redshift Survey ◽  
Space Distortion ◽  
Galaxy Redshift

This paper describes the goals, current status and some preliminary results from the 2dF Galaxy Redshift Survey. In particular we present the most precise measurement to date of the redshift-space distortion parameter, β ≡ Ω0.6/b = 0.39 ± 0.05. Combined with recent CMB anisotropy measurements, our results strongly favour a low-density universe.

Ultra-Precise Measurement of Distance by Fabry-Perot Resonator

2005 ◽  
pp. 45
Author(s):  
O. ?íp ◽  
F. Petr? ◽  
J. Lazar ◽  
Z. Buchta
Keyword(s):  
Precise Measurement ◽  
Fabry Perot
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