An SMS (single mode - multi mode - single mode) fiber structure for vibration sensing

We describe an SMS (single mode - multi mode - single mode) fiber structure to be used in a vibration sensing system. The fiber structure was fabricated by splicing a section (about 300 mm in length) of a step index multi mode fiber between two single mode fibers obtained from a communication grade...

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Bibliographic Details
Published inJournal of physics. Conference series Vol. 817; no. 1; pp. 12035 - 12040
Main Authors Waluyo, T B, Bayuwati, D
Format Journal Article
LanguageEnglish
Published Bristol IOP Publishing 10.04.2017
Subjects
Electromagnetic interference
Light sources
Loudspeakers
Optical fibers
Physics
Refractivity
Splicing
Vibration measurement
Weight reduction
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Summary:We describe an SMS (single mode - multi mode - single mode) fiber structure to be used in a vibration sensing system. The fiber structure was fabricated by splicing a section (about 300 mm in length) of a step index multi mode fiber between two single mode fibers obtained from a communication grade fiber patchcord. Interference between higher order modes occurs while light from a narrow band light source travels along the multi mode fiber. When the multi mode fiber vibrates, the refractive index profile is changed because of the photo-elastics effect and the amplitude of the interference pattern is changed accordingly. To simulate a vibrating structure we used a loudspeaker to vibrate a wooden table. By using a digital oscilloscope, we recorded and analysed the vibrating signals obtained from the SMS fiber structure as well as from a GS-32CT geophone for referencing. We observed that this SMS fiber structure was potential to be used in a vibration sensing system with a measurement range from 30 to 180 Hz with inherent optical fiber sensor advantages such as light weight, immune to electromagnetic interference, and no electricity in the sensing part.
ISSN:1742-6588
1742-6596
DOI:10.1088/1742-6596/817/1/012035