Low cost optical fibre based Fabry–Perot strain sensor production

Tuck, Christopher; Hague, Richard; Doyle, Crispin

doi:10.1088/0957-0233/17/8/021

Cited by 20 publications

(12 citation statements)

References 24 publications

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“…A much faster intrinsic etching rate in the germaniumdoped core of the SMF over the pure fused silica cladding follows the respective reactions 109,110 GeO 2 + 4HF…”

Section: Flice Fabrication and Lif Methodsmentioning

confidence: 99%

Chemical-assisted femtosecond laser writing of lab-in-fibers

et al. 2014

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The lab-on-chip (LOC) platform has presented a powerful opportunity to improve functionalization, parallelization, and miniaturization on planar or multilevel geometries that has not been possible with fiber optic technology. A migration of such LOC devices into the optical fiber platform would therefore open the revolutionary prospect of creating novel lab-in-fiber (LIF) systems on the basis of an efficient optical transport highway for multifunctional sensing. For the LIF, the core optical waveguide inherently offers a facile means to interconnect numerous types of sensing elements along the optical fiber, presenting a radical opportunity for optimizing the packaging and densification of diverse components in convenient geometries beyond that available with conventional LOCs. In this paper, three-dimensional patterning inside the optical fiber by femtosecond laser writing, together with selective chemical etching, is presented as a powerful tool to form refractive index structures such as optical waveguides and gratings as well as to open buried microfluidic channels and optical resonators inside the flexible and robust glass fiber. In this approach, optically smooth surfaces (~12 nm rms) are introduced for the first time inside the fiber cladding that precisely conform to planar nanograting structures when formed by aberration-free focusing with an oil-immersion lens across the cylindrical fiber wall. This process has enabled optofluidic components to be precisely embedded within the fiber to be probed by either the single-mode fiber core waveguide or the laser-formed optical circuits. We establish cladding waveguides, X-couplers, fiber Bragg gratings, microholes, mirrors, optofluidic resonators, and microfluidic reservoirs that define the building blocks for facile interconnection of inline core-waveguide devices with cladding optofluidics. With these components, more advanced, integrated, and multiplexed fiber microsystems are presented demonstrating fluorescence detection, Fabry-Perot interferometric refractometry, and simultaneous sensing of refractive index, temperature, and bending strain. The flexible writing technique and multiplexed sensors described here open powerful prospects to migrate the benefits of LOCs into a more flexible and miniature LIF platform for highly functional and distributed sensing capabilities. The waveguide backbone of the LIF inherently provides an efficient exchange of information, combining sensing data that are attractive in telecom networks, smart catheters for medical procedures, compact sensors for security and defense, shape sensors, and low-cost health care products.

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“…A much faster intrinsic etching rate in the germaniumdoped core of the SMF over the pure fused silica cladding follows the respective reactions 109,110 GeO 2 + 4HF…”

Section: Flice Fabrication and Lif Methodsmentioning

confidence: 99%

Chemical-assisted femtosecond laser writing of lab-in-fibers

et al. 2014

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“…Berbagai sistem sensor fiber optik untuk mengukur strain dan stress telah banyak dikembangkan. Sistem sensor tersebut adalah sensor FBG (Fibre Bragg Grating) [2] yang prinsipnya adalah mengukur perubahan intensitas sinyal optik yang direfleksikan sebagai fungsi dari perubahan panjang gelombang dan strain pada fiber optik, sensor FPI (Fabry Perot Interferometer) [3] berdasarkan multi refleksi fabry perot yang berinterferensi, sensor ESPC (embedded sensor protection system) [4] yang mengukur perubahan strain dan strain akibat perubahan struktur yang terdeteksi serta masih banyak lagi. Semua sistem tersebut tentunya memiliki kelebihan dan kekurangan masing-masing.…”

Section: Pendahuluanunclassified

Evaluasi Perancangan Sensor Fiber Optik Plastik untuk Pengukuran Stress dan Strain

Sugiarti¹,

Desiati²,

Puranto³

et al. 2007

JFA

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Sensor strain digunakan untuk mengukur perubahan strain akibat stress pada suatu bahan. Dalam penelitian ini, telah dirancang sensor strain menggunakan fiber optik dari bahan dielektris plastik dengan teknik pencacatan. Teknik yang dipakai adalah untuk melihat perubahan intensitas cahaya yang terdeteksi sebagai akibat dari stress yang diterima fiber optik. Pengamatan dalam perancangan sensor fiber optik menggunakan PC mikroskop sehingga struktur permukaan fiber yang kecil dan halus dapat terlihat. Untuk mengetahui besaran strain akibat stress yang terukur dibutuhkan sumber cahaya laser, fotodetektor, rangkaian amplifier, modul akuisisi data (DAQ) dan PC. Evaluasi hasil perancangan sensor dilakukan dengan uji tarik (tensile) fiber optik yang diletakkan pada spesimen menggunakan mesin universal tensile meter (UTM).

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“…Meanwhile, the interference wavelength is sensitive to the temperature, making these interferometers potential instruments for simultaneously measuring the SRI and temperature. Multiple techniques have been used to fabricate the reflection probe, such as a Michelson interferometer [8], an in-line Sagnac interferomenter [9], and a Fabry-Perot (FP)-based interferomenter [10]. Among them, FP-based devices have a more relatively compact size and flexible structure designs, such as splicing a short section of photonic crystal fiber [11], etching an air cavity in a single-mode fiber (SMF) [12], and incorporating an air hole using a femtosecond laser [13].…”

Section: Introductionmentioning

confidence: 99%

Simultaneous measurement of refractive index and temperature using an epoxy resin-based interferometer

Wang

Ren

2014

Appl. Opt.

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A fiber-optics reflection probe based on fiber Fabry-Perot interference (FFPI) is proposed and experimentally demonstrated. The sensing structure comprises an epoxy resin (ER)-based cap on the end-face of the single-mode fiber. A well-defined interference spectrum is obtained by the reflective beams of two surfaces of the ER cap. The simultaneous measurements, including fringe contrast-referenced for the surrounding refractive index (SRI) and wavelength-referenced for temperature, have been achieved via selective interference dips monitoring. Experimental results indicate that the proposed FFPI presents an SRI sensitivity of 57.69 dB/RIU in the measurement range of 1.33-1.40 RIU and a temperature sensitivity of 0.98 pm·μm^-1·°C^-1 with per unit cavity length in the range of 30°C-70°C. The proposed sensor has advantages of being compact and robust, making it an alternative candidate as a smart sensor in chemical and biological applications.

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Low cost optical fibre based Fabry–Perot strain sensor production

Cited by 20 publications

References 24 publications

Chemical-assisted femtosecond laser writing of lab-in-fibers

Chemical-assisted femtosecond laser writing of lab-in-fibers

Evaluasi Perancangan Sensor Fiber Optik Plastik untuk Pengukuran Stress dan Strain

Simultaneous measurement of refractive index and temperature using an epoxy resin-based interferometer

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