Dielectric film based optical fiber sensor using Fabry–Perot resonant structure

Peng, Jue; Lyu, Dajuan; Huang, Qing; Qu, Yapeng; Wang, Weijia; Sun, Tengpeng; Yang, Minghong

doi:10.1016/j.optcom.2018.08.037

Cited by 20 publications

(11 citation statements)

References 29 publications

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“…The sensitivity can be amplified times the least common multiple by spectral tracking of the envelope. These two FPs in TVE FPI can be arranged by both cascaded and parallel structure [21,22]. However, a thin-film sensing FP is usually accompanied by an additional air FP cavity in fabrications [21,23], which will break the OPL matching condition of TVE, and lead in information aliasing if parallel structure is used.…”

Section: Introductionmentioning

confidence: 99%

Ultra-High-Sensitivity Humidity Fiber Sensor Based on Harmonic Vernier Effect in Cascaded FPI

Zhou

Song²,

Zhou³

et al. 2022

Sensors

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In this study, an ultra-high-sensitivity fiber humidity sensor with a chitosan film cascaded Fabry–Perot interferometer (FPI) based on the harmonic Vernier effect (HVE) is proposed and demonstrated. The proposed sensor can break the limitation of the strict optical path length matching condition in a traditional Vernier effect (TVE) FPI to achieve ultra-high sensitivity through the adjustment of the harmonic order of the HVE FPI. The intersection of the internal envelope tracking method allows spectra demodulation to no longer be limited by the size of the FSR of the FPI. The sensitivity of the proposed sensor is −83.77 nm/%RH, with a magnification of −53.98 times. This work acts as an excellent guide in the fiber sensing field for the further achievement of ultra-high sensitivity.

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Section: Introductionmentioning

confidence: 99%

Ultra-High-Sensitivity Humidity Fiber Sensor Based on Harmonic Vernier Effect in Cascaded FPI

Zhou

Song²,

Zhou³

et al. 2022

Sensors

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“…N recent years, optical fiber sensors have received great attention in people's daily life because of their compact structure, light weight, high sensitivity, fast response, and anti-electromagnetic interference [1][2]. They have been widely used in many sensing fields, including pressure [3][4], humidity [5], refractive index [6] and magnetic field [7][8].…”

Section: Introductionmentioning

confidence: 99%

A Few Mode Fiber Temperature Sensor Filled With PDMS Based on Vernier Effect

Ran

et al. 2021

IEEE Photonics J.

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A few mode fiber temperature sensor filled with PDMS based on vernier effect is proposed. It uses single mode fiber (SMF), few mode fiber (FMF), and polydimethylsiloxane (PDMS) to form the SMF-air microcavity-FMF-PDMS-FMF structure. It is to slot the glass capillary tube, place the two FMFs in the slot at a suitable distance, and fill the slot with PDMS multiple times and seal it. The PDMS is used as a sensing microcavity. We insert the SMF from the other end of the glass capillary tube, adjust the distance, fix the SMF and seal the connection. Two end faces of the SMF and the first FMF form an air reference microcavity. Since the refractive index of each medium is different, multiple reflective surfaces are formed to reflect. Because the second FMF is infinitely long, whose right end is beveled, it is considered that the sensor has four reflected beams. When the temperature changes, the length and refractive index of the PDMS microcavity will change, which will cause a change in the interference spectrum of the sensor. And because the vernier effect is formed by the superposition of the two microcavities, the temperature sensitivity can be amplified and the temperature can be measured with high sensitivity. The experimental results show that in the range of 40-56°C, the transmission spectrum of the sensor appears red shift with the increase of temperature, and the temperature sensitivity can reach 3.89nm/°C. The sensor is simple to manufacture, has high sensitivity, and has good application prospects.

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“…Many implemented interferometers are based on Bragg gratings, optic fiber, mirrors, crystals, and their combinations [1][2][3][4][5]. Interferometers find practical applications for physical parameter measurements, such as temperature, strain, humidity, pressure, level, current, voltage, and vibration [6][7][8][9][10].…”

Section: Introductionmentioning

confidence: 99%

Low-Finesse Fabry–Pérot Interferometers Applied in the Study of the Relation between the Optical Path Difference and Poles Location

Bonilla

Guillén-Bonilla

Betancourtt

et al. 2020

Sensors

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Interferometry sensors are frequently analyzed by applying the Fourier transform because the transformation separates all frequency components of its signal, making its study on a complex plane feasible. In this work, we study the relation between the optical path difference (OPD) and poles location theoretically and experimentally, using the Laplace transform and a pole-zero map. Theory and experiments are in concordance. For our study, only the cosine function was considered, which is filtered from the interference pattern. In experimental work, two unperturbed low-finesse Fabry–Pérot interferometers were used. First, a Fabry–Pérot interferometer that has a cavity length of ~ 1.6 mm was used. Its optical path difference was 2.33 mm and the poles were localized at points ± i 12 . rad/nm. Secondly, a Fabry–Pérot interferometer with a cavity length of ~ 5.2 mm was used, and its optical path difference was 7.59 mm and the poles were localized at points ± i 40.4 rad/nm. Experimental results confirmed the theoretical analysis. Our proposal finds practical application for interferometer analysis, signal processing of optical fiber sensors, communication system analysis, and multiplexing systems based on interferometers.

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Dielectric film based optical fiber sensor using Fabry–Perot resonant structure

Cited by 20 publications

References 29 publications

Ultra-High-Sensitivity Humidity Fiber Sensor Based on Harmonic Vernier Effect in Cascaded FPI

Ultra-High-Sensitivity Humidity Fiber Sensor Based on Harmonic Vernier Effect in Cascaded FPI

A Few Mode Fiber Temperature Sensor Filled With PDMS Based on Vernier Effect

Low-Finesse Fabry–Pérot Interferometers Applied in the Study of the Relation between the Optical Path Difference and Poles Location

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