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Development of an optical fiber-based interferometer for strain measurements in non-destructive application

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Abstract
In this paper, an extrinsic Fabry–Perot interferometer (EFPI) has been demonstrated for strain measurements. A monochromatic light source with a wavelength of 1310 nm is propagated into a single-mode fiber and then passed through the sensing arm. Approximately, 4 % of the beam is reflected off at the fiber end generating the “reference signal”, while the rest is next transmitted to the target and
reflected back to the sensing arm as the “sensing beam”. The interference signal is, however, generated from the superposition
between two beams (reference and sensing signals) in the fiber arm. The number of interference signal also called “fringe” is, normally, directly proportional to the displacement of the target movement. Fringe counting technique is also proposed for demodulating the fringe number to the displacement information. Consequently, the displacement is then converted to the strain value by referring to a basic of
strain theory. A cantilever beam fastened to a mechanical wave driver has been utilized as a vibrator for the experimental studies. Two experiments have been investigated for the sensor performance’s study. By varying the frequency excitation from 60 to 180 Hz, and also the amplitude excitation from 0.25 to 5 V, the output strain range of 0.082–1.556 and 0.246–2.702 με has been apparent, respectively. In addition, a commercial strain sensor has also been used as a reference, leading to an average percentage error of 1.563 %.

Keywords Fabry–Perot interferometer · Interference signal · Non-destructive measurement · Strain measurement

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Informasi Detail

Judul Seri

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No. Panggil

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Penerbit

: Springer-Verlag Berlin Heidelberg., 2017

Deskripsi Fisik

Electrical Engineering Volume 99, Issue 1, March 2017

Bahasa

English

ISBN/ISSN

1432-0487

Klasifikasi

NONE

Tipe Isi

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Tipe Media

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Tipe Pembawa

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Edisi

Volume 99, Issue 1, March 2017

Subjek

TEKNIK ELEKTRO
ELECTRICAL ENGINEERING

Info Detail Spesifik

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Pernyataan Tanggungjawab

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