Results 21 to 30 of about 10,414 (210)

Measurement of the Optical Path Difference Caused by Steering Mirror Using an Equal-Arm Heterodyne Interferometer

Photonics, 2023
In space gravitational wave detection, the inter-satellite link-building process requires a type of steering mirror to achieve point-ahead angle pointing.
Weizhou Zhu, Yue Guo, Qiyi Jin, Xue Wang, Xingguang Qian, Yong Xie, Lingqiang Meng, Jianjun Jia   +7 more
doaj   +1 more source

The Role of the Transverse Arch in Progressive Collapsing Foot Deformity (PCFD): A Retrospective Case Control Study

Foot & Ankle Orthopaedics, 2022
Category: Midfoot/Forefoot; Basic Sciences/Biologics; Hindfoot Introduction/Purpose: A recent study published in Nature (Venkadesan et al.) demonstrated that coupling the transverse arch (TA) with the medial longitudinal arch (MLA) significantly ...
Eli Schmidt, Ki Chun Kim MD, Kepler Carvalho MD, Kevin N. Dibbern PhD, Chris Cychosz MD, Nacime SB Mansur MD, Samuel Braza, Matthieu Lalevée MD, Cesar de Cesar Netto MD, PhD   +8 more
doaj   +1 more source

Experimental demonstration of reduced tilt-to-length coupling by using imaging systems in precision interferometers [PDF]

International Conference on Space Optics — ICSO 2016, 2017
Angular misalignment of one of the interfering beams in laser interferometers can couple into the interferometric length measurement and is called tilt-to-length (TTL) coupling in the following. In the noise budget of the planned space-based gravitational-wave detector evolved Laser Interferometer Space Antenna (eLISA) [1, 2] TTL coupling is the second
Tröbs, M., Chwalla, M., Danzmann, K., Fernández Barránco, G., Fitzsimons, E., Gerberding, O., Heinzel, G., Killow, C. J., Lieser, M., Perreur-Lloyd, M., Robertson, D. I., Schuster, S., Schwarze, T. S., Ward, H., Zwetz, M.   +14 more
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Research on Telescope TTL Coupling Noise in Intersatellite Laser Interferometry

Photonic Sensors, 2019
The detection mission of gravitational waves in space is that the accuracy of the long-baseline intersatellite laser interferometry on the million-kilometer order needs to reach the order of $$8 \rm{pm}/\sqrt{\rm{Hz}}$$ 8 p m / H z .
Zhi Wang, Tao Yu, Ya Zhao, Ziren Luo, Wei Sha, Chao Fang, Yukun Wang, Shaoxin Wang, Keqi Qi, Yongxian Wang, Xuanwen Xu   +10 more
doaj   +1 more source

Laser-dilatometer calibration using a single-crystal silicon sample

International Journal of Optomechatronics, 2019
Marginal changes in geometrical dimensions due to temperature changes affect the performance of optical instruments. Highly dimensionally stable materials can minimize these effects since they offer low coefficients of thermal expansion (CTE).
Ines Hamann, Josep Sanjuan, Ruven Spannagel, Martin Gohlke, Gudrun Wanner, Sönke Schuster, Felipe Guzman, Claus Braxmaier   +7 more
doaj   +1 more source

Experimental Demonstration of Geometric Tilt-to-Length Noise Model in Test Mass Interferometer

Sensors
Space-based gravitational wave detection missions impose extremely stringent requirements on the measurement precision of the laser interferometer, where tilt-to-length coupling noise emerges as a critical factor degrading performance. This paper focuses
Mengyang Zhao, Jia Shen, Shaoxin Wang, Keqi Qi, Heshan Liu, Peng Xu, Ruihong Gao, Ziren Luo   +7 more
doaj   +1 more source

Design and Testing of a Flexible Inclinometer Probe for Model Tests of Landslide Deep Displacement Measurement

Sensors, 2018
The physical model test of landslides is important for studying landslide structural damage, and parameter measurement is key in this process. To meet the measurement requirements for deep displacement in landslide physical models, an automatic flexible ...
Yongquan Zhang, Huiming Tang, Changdong Li, Guiying Lu, Yi Cai, Junrong Zhang, Fulin Tan   +6 more
doaj   +1 more source

Tilt-to-length noise coupled by wavefront errors in the interfering beams for the space measurement of gravitational waves

Optics Express, 2020
The space-based gravitational wave detection programs, like the Laser Interferometer Space Antenna (LISA) or the Taiji program, aim to detect gravitational waves in space with a triangular constellation of three spacecraft. The unavoidable jitters of the spacecraft and the pointing will couple with the misalignment of the interfering beams into the ...
Ya, Zhao, Jia, Shen, Chao, Fang, Heshan, Liu, Zhi, Wang, Ziren, Luo   +5 more
openaire   +2 more sources

Towards a tilt-to-length coupling calibration on the GRACE follow-on laser ranging instrument [PDF]

International Conference on Space Optics — ICSO 2018, 2019
The Laser Ranging Instrument (LRI) measures the biased range between the two GRACE Follow-On spacecraft (launched in May 2018) using laser interferometry. It is the first of its type and serves as a technology demonstrator. Here we present the working principle and a brief report on the first turn-on of the instrument.
openaire   +1 more source

Performance of fiber-based QAM/FSO systems in turbulence with anisotropic tilt angle and random angular jitter

Results in Engineering
Recent experiments have demonstrated that the anisotropic property of turbulence cells is inherently present, and the long axis of turbulence cell possibly is not level with the ground but has an anisotropic tilt angle with it.
Chao Zhai, Zhenyuan Xue
doaj   +1 more source