Backscatter-modulated laser diode for low-frequency small-amplitude vibration measurement

1997 ◽  
Vol 36 (31) ◽  
pp. 8233 ◽  
Author(s):  
T. Gharbi ◽  
A. Courteville ◽  
A. Chebbour
Keyword(s):  
Laser Diode ◽  
Small Amplitude ◽  
Low Frequency ◽  
Vibration Measurement ◽  
Amplitude Vibration

Low-frequency vibration measurement with a backscatter-modulated laser diode

1999 ◽  
Author(s):  
Jing Zhang ◽  
Qingming Luo ◽  
Shaoqun Zeng ◽  
Hui Gong ◽  
Weiguo Chen
Keyword(s):  
Laser Diode ◽  
Low Frequency ◽  
Vibration Measurement ◽  
Low Frequency Vibration

scholarly journals Electron acoustic solitons in the Earth's magnetotail

2004 ◽  
Vol 11 (2) ◽  
pp. 215-218 ◽  
Author(s):  
S. G. Tagare ◽  
S. V. Singh ◽  
R. V. Reddy ◽  
G. S. Lakhina
Keyword(s):  
Electron Beam ◽  
Small Amplitude ◽  
Low Frequency ◽  
Frequency Component ◽  
Magnetized Plasma ◽  
Cold Electron ◽  
Ion Plasma ◽  
Electron Acoustic ◽  
Two Temperature ◽  
Perpendicular Polarization

Abstract. Small amplitude electron - acoustic solitons are studied in a magnetized plasma consisting of two types of electrons, namely cold electron beam and background plasma electrons and two temperature ion plasma. The analysis predicts rarefactive solitons. The model may provide a possible explanation for the perpendicular polarization of the low-frequency component of the broadband electrostatic noise observed in the Earth's magnetotail.

scholarly journals Pendulum-Type Hetero-Core Fiber Optic Accelerometer for Low-Frequency Vibration Monitoring

Sensors ◽  
2018 ◽  
Vol 18 (8) ◽  
pp. 2528 ◽  
Author(s):  
Hiroshi Yamazaki ◽  
Ichiro Kurose ◽  
Michiko Nishiyama ◽  
Kazuhiro Watanabe
Keyword(s):  
Fiber Optics ◽  
Electromagnetic Interference ◽  
Large Scale ◽  
Fiber Optic ◽  
Low Frequency ◽  
Fiber Optic Sensor ◽  
Vibration Monitoring ◽  
Vibration Measurement ◽  
Displacement Sensor ◽  
Core Fiber

In this paper, a novel pendulum-type accelerometer based on hetero-core fiber optics has been proposed for structural health monitoring targeting large-scale civil infrastructures. Vibration measurement is a non-destructive method for diagnosing the failure of structures by assessing natural frequencies and other vibration patterns. The hetero-core fiber optic sensor utilized in the proposed accelerometer can serve as a displacement sensor with robustness to temperature changes, in addition to immunity to electromagnetic interference and chemical corrosions. Thus, the hetero-core sensor inside the accelerometer measures applied acceleration by detecting the rotation of an internal pendulum. A series of experiments showed that the hetero-core fiber sensor linearly responded to the rotation angle of the pendulum ranging within (−6°, 4°), and furthermore the proposed accelerometer could reproduce the waveform of input vibration in a frequency band of several Hz order.

Low-Frequency Vibration Measurement Based on Spatiotemporal Analysis of Shadow Moiré

2011 ◽  
Vol 31 (4) ◽  
pp. 0412005
Author(s):  
史红健 Shi Hongjian ◽  
朱飞鹏 Zhu Feipeng ◽  
何小元 He Xiaoyuan
Keyword(s):  
Low Frequency ◽  
Spatiotemporal Analysis ◽  
Vibration Measurement ◽  
Shadow Moire ◽  
Shadow Moiré ◽  
Low Frequency Vibration

scholarly journals Low-frequency vibration measurement by a dual-frequency DBR fiber laser

2017 ◽  
Vol 7 (3) ◽  
pp. 206-210 ◽  
Author(s):  
Bing Zhang ◽  
Linghao Cheng ◽  
Yizhi Liang ◽  
Long Jin ◽  
Tuan Guo ◽  
...  
Keyword(s):  
Fiber Laser ◽  
Low Frequency ◽  
Vibration Measurement ◽  
Dual Frequency ◽  
Low Frequency Vibration
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