2 Micron CW Vibration Sensing Laser Radar

1998 ◽  
Author(s):  
Richard D. Richmond
Keyword(s):  
Laser Radar ◽  
Vibration Sensing

Atmospheric Observation by a Laser Radar Using Raman Scattering and Mie Scattering

2003 ◽  
Vol 123 (10) ◽  
pp. 1714-1720 ◽  
Author(s):  
Tetsuo Fukuchi ◽  
Takuya Nayuki ◽  
Takashi Fujii ◽  
Koshichi Nemoto
Keyword(s):  
Raman Scattering ◽  
Mie Scattering ◽  
Laser Radar

Improvement in Distance Resolution of Chaos Laser Radar Using Phase Delay Circuit

2008 ◽  
Vol 128 (4) ◽  
pp. 607-612
Author(s):  
Nagayuki Sato ◽  
Yoshikazu Yano ◽  
Norio Tsuda ◽  
Jun Yamada
Keyword(s):  
Phase Delay ◽  
Laser Radar ◽  
Delay Circuit

Laser Radar Receiver Performance Improvement by Inter Symbol Interference

2012 ◽  
Vol E95.B (8) ◽  
pp. 2631-2637 ◽  
Author(s):  
Xuesong MAO ◽  
Daisuke INOUE ◽  
Hiroyuki MATSUBARA ◽  
Manabu KAGAMI
Keyword(s):  
Performance Improvement ◽  
Laser Radar ◽  
Receiver Performance ◽  
Inter Symbol Interference

Vibration sensing-based human and infrastructure safety/health monitoring: A survey

2021 ◽  
pp. 103037
Author(s):  
Maria Valero ◽  
Fangyu Li ◽  
Liang Zhao ◽  
Chi Zhang ◽  
Jose Garrido ◽  
...  
Keyword(s):  
Health Monitoring ◽  
Vibration Sensing

scholarly journals Comparative Study of PVDF Sheets and Their Sensitivity to Mechanical Vibrations: The Role of Dimensions, Molecular Weight, Stretching and Poling

Nanomaterials ◽  
2021 ◽  
Vol 11 (7) ◽  
pp. 1637
Author(s):  
Miroslav Mrlík ◽  
Josef Osička ◽  
Martin Cvek ◽  
Markéta Ilčíková ◽  
Peter Srnec ◽  
...  
Keyword(s):  
Molecular Weight ◽  
Comparative Study ◽  
Vinylidene Fluoride ◽  
Initial Thickness ◽  
Complementary Method ◽  
Β Phase ◽  
Vibration Sensing ◽  
Poly Vinylidene Fluoride ◽  
Processing Techniques ◽  
The Comparative Study

This paper is focused on the comparative study of the vibration sensing capabilities of poly(vinylidene fluoride) (PVDF) sheets. The main parameters such as molecular weight, initial sample thickness, stretching and poling were systematically applied, and their impact on sensing behavior was examined. The mechanical properties of prepared sheets were investigated via tensile testing on the samples with various initial thicknesses. The transformation of the α-phase to the electro-active β-phase was analyzed using FTIR after applying stretching and poling procedures as crucial post-processing techniques. As a complementary method, the XRD was applied, and it confirmed the crystallinity data resulting from the FTIR analysis. The highest degree of phase transformation was found in the PVDF sheet with a moderate molecular weight (Mw of 275 kDa) after being subjected to the highest axial elongation (500%); in this case, the β-phase content reached approximately 90%. Finally, the vibration sensing capability was systematically determined, and all the mentioned processing/molecular parameters were taken into consideration. The whole range of the elongations (from 50 to 500%) applied on the PVDF sheets with an Mw of 180 and 275 kDa and an initial thickness of 0.5 mm appeared to be sufficient for vibration sensing purposes, showing a d33 piezoelectric charge coefficient from 7 pC N−1 to 9.9 pC N−1. In terms of the d33, the PVDF sheets were suitable regardless of their Mw only after applying the elongation of 500%. Among all the investigated samples, those with an initial thickness of 1.0 mm did not seem to be suitable for vibration sensing purposes.

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