Stabilized dual-wavelength fiber-optic interferometer for vibration measurement

1991 ◽  
Vol 16 (1) ◽  
pp. 56 ◽  
Author(s):  
O. B. Wright
Keyword(s):  
Fiber Optic ◽  
Dual Wavelength ◽  
Vibration Measurement ◽  
Fiber Optic Interferometer

scholarly journals New Methods to Seismic Monitoring: Laboratory Comparative Study of Michelson Fiber-Optic Interferometer and Pneumatic Measurement Systems

Photonics ◽  
2021 ◽  
Vol 8 (5) ◽  
pp. 147
Author(s):  
Martin Stolarik ◽  
Jan Nedoma ◽  
Radek Martinek ◽  
Stanislav Kepak ◽  
Eva Hrubesova ◽  
...  
Keyword(s):  
Fiber Optics ◽  
Fiber Optic ◽  
International System ◽  
Physical Principle ◽  
Vibration Monitoring ◽  
Vibration Measurement ◽  
Promising Alternative ◽  
Seismic Engineering ◽  
System Of Units ◽  
Fiber Optic Interferometer

New possibilities of vibration monitoring can be found in completely different physical approaches, where all measuring technology is currently based on sensors in the electrical domain. This paper presents two different promising alternative approaches to vibration measurement, specifically in the field of fiber-optics and pneumatic sensors. The proposed solution uses a Michelson fiber-optic interferometer designed without polarization fading and with operationally passive demodulation technique using three mutually phase-shifted optical outputs. Experimentally developed sensor systems for the registration of anthropogenic seismic phenomena were complemented by standard instrumentation for measuring seismicity used as a standard. The measurement was performed under simplified conditions using a calibrated stroke as a source of dynamic loading. In addition to alternative systems, the paper also presents the results of recalculation of the measured values in a time domain and basic relationships for the conversion to basic units derived from the SI (International System of Units) system and used internationally in the field of seismic engineering. The results presented demonstrate that even systems operating on a different physical principle have great potential to replace the existing seismic devices. The correlation coefficients for both sensory devices were high (above 0.9) and the average deviations from the measured values of the amplitude of the oscillation velocity did not exceed the value of 0.02, neither with the fiber-optic or pneumatic sensor.

Fiber optic sensor for the measurement of concentration of silica in water with dual wavelength probing

2010 ◽  
Vol 81 (3) ◽  
pp. 035111 ◽  
Author(s):  
Benjamin Varghese P ◽  
Satish John ◽  
K. N. Madhusoodanan
Keyword(s):  
Fiber Optic ◽  
Dual Wavelength ◽  
Fiber Optic Sensor ◽  
Optic Sensor

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

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.

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