Increasing the Sensitivity of an Optic Level Sensor With a Wavelength and Phase Sensitive Single-Mode Multimode Single-Mode Fiber Structure

Fuentes, Omar; Villar, Ignacio Del; Vento, Jose R.; Socorro, Abian B.; Gallego, Elieser E.; Corres, Jesús M.; Matı́as, Ignacio R.

doi:10.1109/jsen.2017.2724849

Cited by 20 publications

(10 citation statements)

References 24 publications

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“…In order to test the device, a technique based on a robotic procedure was applied, very similar to that shown in [23]. The obtained sensitivity was 0.33 nm/mm, and presented high stability during the measurements.…”

Section: Measurements With Mcm-based Sensorsmentioning

confidence: 99%

Multimode-Coreless-Multimode Fiber-Based Sensors: Theoretical and Experimental Study

Fabian

Socorro‐Leránoz

Villar

et al. 2019

J. Lightwave Technol.

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This paper presents a complete study on the spectral behavior of a multimode-coreless-multimode fiber-optic structure, as well as its application as a refractometer and liquid level sensor. The combination of two standard multimode fibers fused to a coreless fiber segment allows generating narrow interferometric bands in the optical spectrum, whose sensitivity can be improved by an adequate selection of the dimensions of the device (the coreless segment length and the diameter of the sensing area). A second way to improve the performance of the device is to deposit a thin-film of SnO2, which allows increasing the sensitivity up to 314 nm/RIU. This widens the number of applications where this structure can be used. As an example, a liquid level sensor with 0.73 nm/mm sensitivity is presented.

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Section: Measurements With Mcm-based Sensorsmentioning

confidence: 99%

Multimode-Coreless-Multimode Fiber-Based Sensors: Theoretical and Experimental Study

Fabian

Socorro‐Leránoz

Villar

et al. 2019

J. Lightwave Technol.

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“…As it is well known, the SMS interferometers can be tuned to work in two modes of operation. One of this is the self-image effect [14], [15], which produces a maximum in the transmission spectrum that is distinguished from other maxima obtained by a fractional constructive interference. To obtain the location of said maximum wavelength [16], the following expression (1) was used:…”

Section: Resultsmentioning

confidence: 99%

Optical fiber vacuum sensor based on modal interferometer and PDMS coating

et al. 2019

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This work studies the behavior of polydimethylsiloxane (PDMS) as a transducer for optical vacuum pressure measurements. The optical structure chosen for this device is a modal interferometer achieved by splicing a coreless multimode optical fiber between two single mode fibers. Then, an etching process is applied to the obtained device, in order to decrease the diameter of the fiber and increase the sensitivity. Finally, the fiber is coated by dip-coating with a layer of PDMS, which changes its volume with pressure changes. The device has been studied in the 1x10 -3 mbar to 10 mbar range with a wavelength shift of 4 nm. A maximum sensitivity of 35 nm/mbar was obtained. The simple fabrication process, which can be applied to other structures more sensitive to strain, suggest that PDMS can be a good choice for the development of optical fiber vacuum sensors.

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“…Here, it is important to remark that the different lengths were determined in such a way that the diameter could be reduced while still giving a good interference pattern. More detailed information about how the different parameters can affect the SMS in terms of the transmitted optical spectrum and sensitivity can be found in [7], [21], [22].…”

Section: A Fabrication Processmentioning

confidence: 99%

“…It consists of two single-mode fibers (SMFs) that are spliced to the ends of a section of a multimode coreless fiber (MMF). This structure is simple to fabricate, and gives sensors with adequate sensitivity [7]- [11]. The SMS structure generates a modal interferometer that is sensitive to several parameters such as temperature [11], strain [9], [12]- [14] and refractive index [8].…”

Section: Introductionmentioning

confidence: 99%

“…In addition, it has been previously demonstrated that reducing the diameter of the fiber by chemical etching leads to an increase in the sensitivity [10] due to a stronger interaction between the evanescent field and the surrounding medium [15]. This improvement in the sensitivity depends exclusively on the diameter rather than on the length of the MMF segment [7], [10]. Although they are not discussed in this work, there are other possibilities for improving the interference pattern of this kind of interferometer, such as the use of few-mode fibers [16] rather than an MMF.…”

Section: Introductionmentioning

confidence: 99%

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Optical Fiber Vacuum Sensor Based on Etched SMS Structure and PDMS Coating

Ascorbe¹,

Fuentes

Arregui

et al. 2021

IEEE Sensors J.

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In this work, an optical fiber vacuum sensor based on a single-mode multimode single-mode (SMS) structure coated with polydimethylsiloxane (PDMS) is studied. The SMS structure generates an interferometric pattern based on multimode interference. The structure is dip-coated with a layer of PDMS, whose optical properties change when it is subjected to varying vacuum pressure. Different strategies are applied in an attempt to improve the final performance of the sensor, such as decreasing the diameter of the fiber and modifying the properties of the coating by modifying the proportion of solvent. Decreasing the diameter of the optical fiber and using toluene as a solvent are both proved to be successful strategies for increasing the sensitivity of the sensor. The devices are studied in the 1x10 -3 -10 mbar range with a maximum wavelength shift of 12 nm, leading to a maximum sensitivity of 35 nm/mbar. The simplicity of the fabrication process, which can be applied to more sensitive structures, suggests that PDMS may be a good choice for the development of optical fiber vacuum sensors.

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Increasing the Sensitivity of an Optic Level Sensor With a Wavelength and Phase Sensitive Single-Mode Multimode Single-Mode Fiber Structure

Cited by 20 publications

References 24 publications

Multimode-Coreless-Multimode Fiber-Based Sensors: Theoretical and Experimental Study

Multimode-Coreless-Multimode Fiber-Based Sensors: Theoretical and Experimental Study

Optical fiber vacuum sensor based on modal interferometer and PDMS coating

Optical Fiber Vacuum Sensor Based on Etched SMS Structure and PDMS Coating

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