Detection of high- and low-frequency vibrations using a feedback- stabilized differential fiber optic interferometer

1993 ◽  
Vol 32 (8) ◽  
pp. 1879 ◽  
Author(s):  
Mehdi Vaez-Iravani
Keyword(s):  
Fiber Optic ◽  
Low Frequency ◽  
Fiber Optic Interferometer

Design for a new fiber optic interferometer of water cut meter in oil well logging

2014 ◽  
Author(s):  
Ying Shang ◽  
Xiao-Hui Liu ◽  
Chang Wang ◽  
Wen-an Zhao
Keyword(s):  
Fiber Optic ◽  
Well Logging ◽  
Oil Well ◽  
Water Cut ◽  
Fiber Optic Interferometer

scholarly journals Testing Time and Frequency Fiber-Optic Link Transfer by Hardware Emulation of Acoustic-Band Optical Noise

2016 ◽  
Vol 23 (2) ◽  
pp. 309-316
Author(s):  
Marcin Lipiński ◽  
Przemysław Krehlik ◽  
Łukasz Śliwczyński ◽  
Łukasz Buczek ◽  
Jacek Kołodziej
Keyword(s):  
Fiber Optic ◽  
Data Transfer ◽  
Acoustic Noise ◽  
Mechanical Vibration ◽  
Low Frequency ◽  
Propagation Delay ◽  
Optical Signal ◽  
Testing Time ◽  
Optical Noise ◽  
Signal Phase

Abstract The low-frequency optical-signal phase noise induced by mechanical vibration of the base occurs in field-deployed fibers. Typical telecommunication data transfer is insensitive to this type of noise but the phenomenon may influence links dedicated to precise Time and Frequency (T&F) fiber-optic transfer that exploit the idea of stabilization of phase or propagation delay of the link. To measure effectiveness of suppression of acoustic noise in such a link, a dedicated measurement setup is necessary. The setup should enable to introduce a low-frequency phase corruption to the optical signal in a controllable way. In the paper, a concept of a setup in which the mechanically induced acoustic-band optical signal phase corruption is described and its own features and measured parameters are presented. Next, the experimental measurement results of the T&F transfer TFTS-2 system’s immunity as a function of the fibre-optic length vs. the acoustic-band noise are presented. Then, the dependency of the system immunity on the location of a noise source along the link is also pointed out.

A scanning force microscope with a fiber‐optic‐interferometer displacement sensor

1991 ◽  
Vol 62 (5) ◽  
pp. 1280-1284 ◽  
Author(s):  
P. J. Mulhern ◽  
T. Hubbard ◽  
C. S. Arnold ◽  
B. L. Blackford ◽  
M. H. Jericho
Keyword(s):  
Fiber Optic ◽  
Displacement Sensor ◽  
Scanning Force Microscope ◽  
Scanning Force ◽  
Fiber Optic Interferometer

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.

Adaptive fiber optic interferometer with CdTe crystal for vibrations measurement

2006 ◽  
Author(s):  
Roman V. Romashko ◽  
Salvatore Di Giloramo ◽  
Ervin Nippolainen ◽  
Jean Claude Launay ◽  
Alexei A. Kamshilin
Keyword(s):  
Fiber Optic ◽  
Cdte Crystal ◽  
Fiber Optic Interferometer
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