Free active element bulk-modulus high-pressure transducer based on fiber-optic displacement sensor

1998 ◽  
Vol 47 (1) ◽  
pp. 179-182
Author(s):  
W.J. Bock ◽  
T. Eftimov ◽  
G.F. Molinar ◽  
R. Wisniewski
Keyword(s):  
High Pressure ◽  
Bulk Modulus ◽  
Pressure Transducer ◽  
Fiber Optic ◽  
Active Element ◽  
Displacement Sensor

Fiber optic displacement sensor used in railway turnout contact monitoring system

2013 ◽  
Author(s):  
Hongbin Xu ◽  
Wentao Zhang ◽  
Yanliang Du ◽  
Feng Li ◽  
Fang Li
Keyword(s):  
Monitoring System ◽  
Fiber Optic ◽  
Displacement Sensor ◽  
Railway Turnout

Deformation of polyiodides in Cs2I8 crystals at high pressure

2021 ◽  
Vol 77 (6) ◽  
Author(s):  
Tomasz Poreba ◽  
Gaston Garbarino ◽  
Davide Comboni ◽  
Mohamed Mezouar
Keyword(s):  
High Pressure ◽  
Electron Transfer ◽  
Bulk Modulus ◽  
Electronic Properties ◽  
Supramolecular Architecture ◽  
Ambient Conditions ◽  
Electron Transfer Mechanism ◽  
Covalently Bonded ◽  
Potential Sources ◽  
High Bulk

Dicaesium octaiodide is composed of layers of zigzag polyiodide units (I8 2−) intercalated with caesium cations. Each I8 2− unit is built of two triiodides bridged with one diiodine molecules. This system was subjected to compression up to 5.9 GPa under hydrostatic conditions. Pressure alters the supramolecular architecture around I8 2−, leading to bending of the triiodide units away from their energetically preferred geometry (D ∞h). Short I2...I3 − contacts compress significantly, reaching lengths typical for the covalently bonded polyiodides. Unlike in reported structures at ambient conditions, pressure-induced catenation proceeds without symmetrization of the polyiodides, pointing to a different electron-transfer mechanism. The structure is shown to be half as compressible [B0 = 12.9 (4) GPa] than the similar CsI3 structure. The high bulk modulus is associated with higher I—I connectivity and a more compact cationic net, than in CsI3. The small discontinuity in the compressibility trend around 3 GPa suggests formation of more covalent I—I bonds. The potential sources of this discontinuity and its implication on the electronic properties of Cs2I8 are discussed.

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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