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Dynamic strain measured by Mach-Zehnder interferometric optical fiber sensors.

Her SC, Yang CM - Sensors (Basel) (2012)

Bottom Line: Optical fibers possess many advantages such as small size, light weight and immunity to electro-magnetic interference that meet the sensing requirements to a large extent.A 3 × 3 coupler is employed to demodulate the phase shift of the Mach-Zehnder interferometer.The experimental results are validated with the strain gauge.

View Article: PubMed Central - PubMed

Affiliation: Department of Mechanical Engineering, Yuan Ze University, Chung-Li 320, Taiwan. mesch@saturn.yzu.edu.tw

ABSTRACT
Optical fibers possess many advantages such as small size, light weight and immunity to electro-magnetic interference that meet the sensing requirements to a large extent. In this investigation, a Mach-Zehnder interferometric optical fiber sensor is used to measure the dynamic strain of a vibrating cantilever beam. A 3 × 3 coupler is employed to demodulate the phase shift of the Mach-Zehnder interferometer. The dynamic strain of a cantilever beam subjected to base excitation is determined by the optical fiber sensor. The experimental results are validated with the strain gauge.

No MeSH data available.


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Schematic diagram of the Mach-Zehnder interferometric optical fiber sensor.
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f2-sensors-12-03314: Schematic diagram of the Mach-Zehnder interferometric optical fiber sensor.

Mentions: To demodulate phase shift Δϕ of the Mach-Zehnder interferometer, a 3 × 3 coupler is employed. Figure 2 shows the schematic diagram of the demodulation scheme. It consists of a 1 × 2 coupler at the input and a 3 × 3 coupler at the output. The two outputs of the 1 × 2 coupler comprise the reference fiber and sensing fiber of the Mach-Zehnder interferometer. The sensing fiber is surface bonded onto the host structure. Mechanical or thermal loadings applied to the host structure, leads to an optical path difference between the two fibers. The difference in the optical path induces a relative phase shift in the Mach-Zehnder interferometer. The two optical signals are guided into two of the three inputs of a 3 × 3 coupler, where they interfere with one another. The methodology developed by Brown et al. [16,17] for demodulation of the phase shift is adopted and briefly described as follows.


Dynamic strain measured by Mach-Zehnder interferometric optical fiber sensors.

Her SC, Yang CM - Sensors (Basel) (2012)

Schematic diagram of the Mach-Zehnder interferometric optical fiber sensor.
© Copyright Policy
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC3376560&req=5

f2-sensors-12-03314: Schematic diagram of the Mach-Zehnder interferometric optical fiber sensor.
Mentions: To demodulate phase shift Δϕ of the Mach-Zehnder interferometer, a 3 × 3 coupler is employed. Figure 2 shows the schematic diagram of the demodulation scheme. It consists of a 1 × 2 coupler at the input and a 3 × 3 coupler at the output. The two outputs of the 1 × 2 coupler comprise the reference fiber and sensing fiber of the Mach-Zehnder interferometer. The sensing fiber is surface bonded onto the host structure. Mechanical or thermal loadings applied to the host structure, leads to an optical path difference between the two fibers. The difference in the optical path induces a relative phase shift in the Mach-Zehnder interferometer. The two optical signals are guided into two of the three inputs of a 3 × 3 coupler, where they interfere with one another. The methodology developed by Brown et al. [16,17] for demodulation of the phase shift is adopted and briefly described as follows.

Bottom Line: Optical fibers possess many advantages such as small size, light weight and immunity to electro-magnetic interference that meet the sensing requirements to a large extent.A 3 × 3 coupler is employed to demodulate the phase shift of the Mach-Zehnder interferometer.The experimental results are validated with the strain gauge.

View Article: PubMed Central - PubMed

Affiliation: Department of Mechanical Engineering, Yuan Ze University, Chung-Li 320, Taiwan. mesch@saturn.yzu.edu.tw

ABSTRACT
Optical fibers possess many advantages such as small size, light weight and immunity to electro-magnetic interference that meet the sensing requirements to a large extent. In this investigation, a Mach-Zehnder interferometric optical fiber sensor is used to measure the dynamic strain of a vibrating cantilever beam. A 3 × 3 coupler is employed to demodulate the phase shift of the Mach-Zehnder interferometer. The dynamic strain of a cantilever beam subjected to base excitation is determined by the optical fiber sensor. The experimental results are validated with the strain gauge.

No MeSH data available.


Related in: MedlinePlus