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A fixed support method for cryogenic silicon cavities of ultra-stable lasers for space applications.
Sci Rep
January 2025
School of Physics and Optoelectronic Engineering, Key Laboratory of Gravitational Wave Precision Measurement of Zhejiang Province, Taiji Laboratory for Gravitational Wave Universe, Hangzhou Institute for Advanced Study, University of Chinese Academy of Sciences, Hangzhou, 310024, China.
In this paper, a fixed support method for a cryogenic monocrystalline silicon Fabry-Pérot cavity of an ultra-stable laser for space applications is proposed. Through finite element analysis, the vibration sensitivity at the center of the cavity is below 10E-12/g; the fundamental frequency is 381 Hz; the thermal deformation is compensated by applying a preload force of about 3 N*m for a variation of 300 K to 124 K. Based on these analyses, an equal-mass cavity simulator was machined and mounted.
View Article and Find Full Text PDFFemtosecond Laser Introduced Cantilever Beam on Optical Fiber for Vibration Sensing.
Sensors (Basel)
November 2024
Hubei Key Laboratory of Optical Information and Pattern Recognition, Wuhan Institute of Technology, Wuhan 430205, China.
An all-fiber vibration sensor based on the Fabry-Perot interferometer (FPI) is proposed and experimentally evaluated in this study. The sensor is fabricated by introducing a Fabry-Perot cavity to the single-mode fiber using femtosecond laser ablation. The cavity and the tail act together as a cantilever beam, which can be used as a vibration receiver.
View Article and Find Full Text PDFAdvancements in Optical Resonator Stability: Principles, Technologies, and Applications.
Sensors (Basel)
October 2024
College of Advanced Interdisciplinary Studies, National University of Defense Technology, Changsha 410073, China.
This paper provides an overview of the study of optical resonant cavity stability, focusing on the relevant principles, key technological advances, and applications of optical resonant cavities in a variety of high-precision measurement techniques and modern science and technology. Firstly, the vibration characteristics, thermal noise, and temperature characteristics of the reference cavity are presented. Subsequently, the report extensively discusses the advances in key technologies such as mechanical vibration isolation, thermal noise control, and resistance to temperature fluctuations.
View Article and Find Full Text PDFAuditory pathway for detection of vibration in the tokay gecko.
Curr Biol
November 2024
Department of Biology, University of Maryland, College Park, MD 20742, USA. Electronic address:
Otolithic endorgans such as the saccule were thought to be strictly vestibular in amniotes (reptiles, birds, and mammals), with little evidence supporting the auditory function found in fish and amphibians (frogs and salamanders). Here, we demonstrate an auditory role for the saccule in the tokay gecko (Gekko gecko). The nucleus vestibularis ovalis (VeO) in the hindbrain exclusively receives input from the saccule and projects to the auditory midbrain, the torus semicircularis, via an ascending pathway parallel to cochlear pathways.
View Article and Find Full Text PDFDiagnostics of unmanned aerial vehicle with recurrence based approach of piezo-element voltage signals.
Sci Rep
July 2024
Centre for Mechanics, School of Mechanical and Materials Engineering, University College Dublin, Stillorgan Road, Belfield, Dublin 4, Republic of Ireland.
This work experimentally addresses damage calibration of an unmanned aerial vehicle in operational condition. A wide range of damage level and types are simulated and controlled by an electric motor via pulse width modulation in this regard. The measurement is carried out via established protocols of using a piezo-patch on one of the 8 arms, utilising the vibration sensitivity and flexibility of the arms, demonstrating repeatability of such protocol.
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