Measurement of dynamic deformations using a path-unbalance Michelson-interferometer-based optical fiber sensing device

LLoret, Sandra; Rastogi, Pramod K.; Thévenaz, Luc; Inaudi, Daniele

doi:10.1117/1.1543563

Cited by 4 publications

(2 citation statements)

References 13 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Fiber equivalents of the Mach-Zehnder and Michelson interferometers have been used in numerous applications for measuring dynamic strains, and temperature, etc [7][8][9][10]. Nevertheless, both of these interferometers require an additional reference interferometer arm which has to be isolated from the measured parameter as well as from the measuring environment.…”

Section: Introductionmentioning

confidence: 99%

An Extrinsic Fiber Fabry-Perot Interferometer for Dynamic Displacement Measurement

Seat¹,

Pullteap²

2007

2007 International Conference on Mechatronics and Automation

View full text Add to dashboard Cite

This paper presents a fiber-based Fabry-Perot interferometer to determine dynamic displacement such as in vibration tracking of an oscillating target. This sensor exploits the dual-cavity principle in the sensing arm to achieve nonambiguous directional displacement measurements and has a measurement range of ~120 μm for a sinusoidal excitation signal up to 125 Hz. By adopting a modified fringe counting technique to take into account all the appropriate points over the two sets of interference signals thereby generated due to target movement, a resolution of ~40 nm can be achieved. The results obtained from the fiber interferometric sensor employed to measure various displacement signals show good agreement with prediction.Index Terms -displacement, Fabry-Perot interferometer, nonambiguous measurement, double cavity, fiber sensor.

show abstract

Section: Introductionmentioning

confidence: 99%

An Extrinsic Fiber Fabry-Perot Interferometer for Dynamic Displacement Measurement

Seat¹,

Pullteap²

2007

2007 International Conference on Mechatronics and Automation

View full text Add to dashboard Cite

show abstract

“…Several distributed fibre-optic sensors have been proposed in the last 20 years for the measurement of strain and displacement in landslide monitoring, including many single-point sensors mimicking traditional devices [166] and integral interferometric sensors [167,168].…”

Section: Distributed Strain Sensing For Slopes and Landslides Monitoringmentioning

confidence: 99%

A Review of Distributed Fibre Optic Sensors for Geo-Hydrological Applications

2017

View full text Add to dashboard Cite

Featured Application: Distributed fibre optic sensors for geo-hydrological applications: a comprehensive review about methodology, weaknesses, and strengths.Abstract: Distributed optical fibre sensing, employing either Rayleigh, Raman, or Brillouin scattering, is the only physical-contact sensor technology capable of accurately estimating physical fields with spatial continuity along the fibre. This unique feature and the other features of standard optical fibre sensors (e.g., minimal invasiveness and lightweight, remote powering/interrogating capabilities) have for many years promoted the technology to be a promising candidate for geo-hydrological monitoring. Relentless research efforts are being undertaken to bring the technology to complete maturity through laboratory, physical models, and in-situ tests. The application of distributed optical fibre sensors to geo-hydrological monitoring is here reviewed and discussed, along with basic principles and main acquisition techniques. Among the many existing geo-hydrological processes, the emphasis is placed on those related to soil levees, slopes/landslide, and ground subsidence that constitute a significant percentage of current geohazards.

show abstract

Intensity‐, Interferometric‐, and Scattering‐Based Optical‐Fiber Sensors

Peters

2008

Encyclopedia of Structural Health Monitoring

View full text Add to dashboard Cite

This article presents the sensing mechanics, strain and temperature sensitivity, and data‐acquisition techniques for optical‐fiber sensors based on intensity, phase shifts, and intrinsic scattering. Such sensors are well suited for health‐monitoring applications. The utilization of standard optical fibers for the measurement of strain through fiber fractures or microbending is described. Afterward, the equation for the phase shift in a lightwave propagating through an optical fiber is derived. The sensitivity of this phase shift to external parameters such as strain and temperature is also derived and typical values for fused silica optical fibers cited. The measurement of this phase shift through Mach–Zehnder and Michelson in‐fiber interferometer configurations is presented. Active and passive homodyne techniques for the interrogation of these periodic phase shift signals to alleviate directional ambiguity and signal fading near quadrature points are described. The alternative interferometer configurations of low‐coherence and Fabry–Perot interferometers are described, which provide absolute measurements of strain and/or temperature for large structural applications. Finally, the measurement of distributed strain and temperatures through intrinsic scattering phenomena with the optical fiber and, in particular, stimulated Brillouin scattering is summarized.

show abstract

Measurement of dynamic deformations using a path-unbalance Michelson-interferometer-based optical fiber sensing device

Cited by 4 publications

References 13 publications

An Extrinsic Fiber Fabry-Perot Interferometer for Dynamic Displacement Measurement

An Extrinsic Fiber Fabry-Perot Interferometer for Dynamic Displacement Measurement

A Review of Distributed Fibre Optic Sensors for Geo-Hydrological Applications

Intensity‐, Interferometric‐, and Scattering‐Based Optical‐Fiber Sensors

Contact Info

Product

Resources

About