scholarly journals Double heterodyne interferometry for high-precision distance measurements

1994 ◽  
Author(s):  
E. Dalhoff ◽  
Edgar W. Fischer ◽  
S. Heim ◽  
Hans J. Tiziani
Keyword(s):  
High Precision ◽  
Heterodyne Interferometry ◽  
Distance Measurements

High Precision Radar Distance Measurements in Overmoded Circular Waveguides

2007 ◽  
Vol 55 (6) ◽  
pp. 1374-1381 ◽  
Author(s):  
Nils Pohl ◽  
Michael Gerding ◽  
Bianca Will ◽  
Thomas Musch ◽  
Josef Hausner ◽  
...  
Keyword(s):  
High Precision ◽  
Distance Measurements ◽  
Circular Waveguides

Fast high-precision distance measurements on scattering technical surfaces using frequency combs

CLEO: 2013 ◽  
2013 ◽  
Author(s):  
C. Weimann ◽  
D. Meier ◽  
S. Wolf ◽  
Y. Schleitzer ◽  
M. Totzeck ◽  
...  
Keyword(s):  
High Precision ◽  
Distance Measurements ◽  
Frequency Combs

scholarly journals High-Precision CO2 Column Length Analysis on the Basis of a 1.57-μm Dual-Wavelength IPDA Lidar

Sensors ◽  
2020 ◽  
Vol 20 (20) ◽  
pp. 5887
Author(s):  
Xin Ma ◽  
Haowei Zhang ◽  
Ge Han ◽  
Hao Xu ◽  
Tianqi Shi ◽  
...  
Keyword(s):  
High Precision ◽  
Adaptive Filtering ◽  
Laser Pulses ◽  
Column Length ◽  
Distance Measurements ◽  
Atmospheric Delay ◽  
Gaussian Decomposition ◽  
Length Analysis ◽  
Sea Area ◽  
Airborne Experiment

For high-precision measurements of the CO2 column concentration in the atmosphere with airborne integrated path differential absorption (IPDA) Lidar, the exact distance of the Lidar beam to the scattering surface, that is, the length of the column, must be measured accurately. For the high-precision inversion of the column length, we propose a set of methods on the basis of the actual conditions, including autocorrelation detection, adaptive filtering, Gaussian decomposition, and optimized Levenberg–Marquardt fitting based on the generalized Gaussian distribution. Then, based on the information of a pair of laser pulses, we use the direct adjustment method of unequal precision to eliminate the error in the distance measurement. Further, the effect of atmospheric delay on distance measurements is considered, leading to further correction of the inversion results. At last, an airborne experiment was carried out in a sea area near Qinhuangdao, China on 14 March 2019. The results showed that the ranging accuracy can reach 0.9066 m, which achieved an excellent ranging accuracy on 1.57-μm IPDA Lidar and met the requirement for high-precision CO2 column length inversion.

A high-precision dilatometer based on sub-nm heterodyne interferometry

2009 ◽  
Author(s):  
Thilo Schuldt ◽  
Martin Gohlke ◽  
Dennis Weise ◽  
Ulrich Johann ◽  
Claus Braxmaier
Keyword(s):  
High Precision ◽  
Heterodyne Interferometry

The white dwarf mass-radius relation with Gaia, Hubble and FUSE

2017 ◽  
Vol 12 (S330) ◽  
pp. 301-304
Author(s):  
Simon R. G. Joyce ◽  
Martin A. Barstow ◽  
Sarah L. Casewell ◽  
Jay B. Holberg ◽  
Howard E. Bond
Keyword(s):  
Star Formation ◽  
High Precision ◽  
White Dwarf ◽  
White Dwarfs ◽  
Distance Measurements ◽  
Theoretical Mass ◽  
History Of

AbstractWhite dwarfs are becoming useful tools for many areas of astronomy. They can be used as accurate chronometers over Gyr timescales. They are also clues to the history of star formation in our galaxy. Many of these studies require accurate estimates of the mass of the white dwarf. The theoretical mass-radius relation is often invoked to provide these mass estimates. While the theoretical mass-radius relation is well developed, observational tests of this relation show a much larger scatter in the results than expected. High precision observational tests to confirm this relation are required. Gaia is providing distance measurements which will remove one of the main source of uncertainty affecting most previous observations. We combine Gaia distances with spectra from the Hubble and FUSE satelites to make precise tests of the white dwarf mass-radius relation.

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