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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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Dynamic strain of a cantilever beam subjected to dual excitation frequencies of 7 Hz and 40 Hz.
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f12-sensors-12-03314: Dynamic strain of a cantilever beam subjected to dual excitation frequencies of 7 Hz and 40 Hz.

Mentions: Substituting these three output signals of the 3 × 3 coupler as shown in Figure 10 into Matlab software, conducts the phase shift demodulation. The result of the phase shift is illustrated in Figure 11. Substituting the phase shift Δϕ(t) from Figure 11 into Equation (3), leads to the dynamic strain of the cantilever beam. The dynamic strains obtained by the optical fiber sensor are compared with the results of the strain gauge as shown in Figure 12. Reasonable agreement is observed between these two sensors. The difference of dynamics strains measured by the optical fiber sensor and strain gauge shown in Figure 12 is about 10 %. The discrepancy can be attributed to the noise of the signals.


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

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

Dynamic strain of a cantilever beam subjected to dual excitation frequencies of 7 Hz and 40 Hz.
© Copyright Policy
Related In: Results  -  Collection

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

f12-sensors-12-03314: Dynamic strain of a cantilever beam subjected to dual excitation frequencies of 7 Hz and 40 Hz.
Mentions: Substituting these three output signals of the 3 × 3 coupler as shown in Figure 10 into Matlab software, conducts the phase shift demodulation. The result of the phase shift is illustrated in Figure 11. Substituting the phase shift Δϕ(t) from Figure 11 into Equation (3), leads to the dynamic strain of the cantilever beam. The dynamic strains obtained by the optical fiber sensor are compared with the results of the strain gauge as shown in Figure 12. Reasonable agreement is observed between these two sensors. The difference of dynamics strains measured by the optical fiber sensor and strain gauge shown in Figure 12 is about 10 %. The discrepancy can be attributed to the noise of the signals.

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