Results 11 to 20 of about 9,282,430 (299)
Multiple-wavelength free-space laser communications [PDF]
SPIE Proceedings, 2003 Free-space optical communications systems in the atmosphere, based on intensity modulation and direct detection, are heavily affected by fading caused by turbulence cells of varying scale and motion. Several data sets of fading measurements under different scenarios have been recorded demonstrating this effect. In this paper we introduce a form of free-
Purvinskis, Robert +4 more
openaire +4 more sources
Sensors, 2022 Time-to-digital converter (TDC) is the key technology to realize accurate time delay measurement in high-precision optical fiber time-frequency transmission and synchronization, optical sensing and many scientific applications.
Xiangyu Mao +5 more
doaj +1 more source
Design considerations for the use of laser-plasma accelerators for advanced space radiation studies [PDF]
, 2012 We present design considerations for the use of laser-plasma accelerators for mimicking space radiation and testing space-grade electronics. This novel application takes advantage of the inherent ability of laser-plasma accelerators to produce particle ...
Koenigstein, T. +4 more
core +4 more sources
Faint Echo Extraction from ALB Waveforms Using a Point Cloud Semantic Segmentation Model
Remote Sensing, 2023 As an active remote sensing technology, airborne LIDAR can work at all times while emitting specific wavelengths of laser light that can penetrate seawater.
Yifan Huang +4 more
doaj +1 more source
Sensors, 2023 In free-space optical (FSO) communication systems, on–off keying (OOK) is a widely used modulation format. Coherent and non-coherent OOK receivers with sensitivities of −54.60 dBm and −51.25 dBm, respectively, were built with a communication rate of 1 ...
Weijie Ren +3 more
doaj +1 more source
IEEE Photonics Journal, 2021 An absolutely consistent fiber-optic phase synchronization scheme based on fixed-phase-reference optical active compensation is proposed. By measuring the time interval of time pulse and the phase difference of frequency signal, and then using the ...
Rui Wu +6 more
doaj +1 more source
Remote Sensing, 2021 The spaceborne double-pulse integrated-path differential absorption (IPDA) light detection and ranging (LIDAR) system was found to be helpful in observing atmospheric CO2 and understanding the carbon cycle.
Yadan Zhu +11 more
doaj +1 more source
Recent Progress in Distributed Fiber Acoustic Sensing with Φ-OTDR
Sensors, 2020 Distributed fiber acoustic sensing (DAS) technology can continuously spatially detect disturbances along the sensing fiber over long distance in real time.
Zhaoyong Wang +3 more
doaj +1 more source
Possible explanations for different surface quality in laser cutting with 1 micron and 10 microns beams [PDF]
, 2012 In laser cutting of thick steel sheets, quality difference is observed between cut surfaces obtained with 1 micron and 10 micron laser beams. This paper investigates physical mechanisms for this interesting and important problem of the wavelength ...
Remy Fabbro +3 more
core +1 more source
Deflecting small asteroids using laser ablation : Deep space navigation and asteroid orbit control for LightTouch2 Mission [PDF]
, 2013 This paper presents a low-cost, low mass, mission design to successfully intercept and deflect a small and faint, 4 m in diameter asteroid. Intended to be launched after 2025, the laser-ablating mission, LightTouch2 will be used to deflect the orbit of ...
Daniel Garci Yarnoz +9 more
core +4 more sources