Sensitivity improvement of optical-fiber temperature sensor with solid cladding material based on multimode interference

Fukano, Hideki; Kushida, Yohei; Taue, Shuji

doi:10.7567/jjap.54.032502

Cited by 26 publications

(14 citation statements)

References 25 publications

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“…In addition, SMS fibre structures have also been successfully developed as optical fibre sensors for a wide variety of measurements, e.g. temperature [6], strain [7], curvature [8], humidity [9], refractive index (RI) [10] and magnetic fields [11,12]. SMS fibre structures can be easily adapted for a wide range of different applications due to the versatility of their fabrication and the fact that all versions (variants) rely on a common underlying operation principle i.e.…”

Section: Introductionmentioning

confidence: 99%

High sensitivity temperature sensor based on singlemode-no-core-singlemode fibre structure and alcohol

Tian

Farrell²,

Wang

et al. 2018

Sensors and Actuators A: Physical

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A high sensitivity temperature sensor based on a singlemode-no-core-singlemode (SNCS) fibre structure and surrounded with alcohol within a silica capillary is described. In this investigation, no-core fibre (NCF) is used as the multimode waveguide and alcohol is chosen as the temperature sensitive medium. By packaging the alcohol solution with a short length of NCF enclosed within a silica capillary, the surrounding temperature can be detected by monitoring the variations of transmission loss at a specific wavelength. The theoretical analysis predicts this temperature sensor can provide high sensitivity, and the experimental results support this. The maximum temperature sensitivity of the sample is 0.49 dB/°C with a potential temperature resolution of 0.02°C at the operating wavelength of 1545.9 nm. In addition, the repeatability and response time of the sensor of this investigation are investigated experimentally.

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Section: Introductionmentioning

confidence: 99%

High sensitivity temperature sensor based on singlemode-no-core-singlemode fibre structure and alcohol

Tian

Farrell²,

Wang

et al. 2018

Sensors and Actuators A: Physical

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“…2. The decrease in n also explained the blue shift in the peak wavelengths with increasing temperature [1]. The temperature sensor with the rounded fiber end-face had a sensitivity of 0.028 °C, which was calculated from the intensity difference at the peak wavelength at 100 °C ( Fig.…”

Section: Methodsmentioning

confidence: 92%

“…A fiber-optic multimode interference (MMI) structure is a fiber interferometer that utilizes modal dispersion in a bare multimode fiber (MMF). An MMI with an MMF encased in a temperature-sensitive cladding material can act as a highly sensitive temperature sensor [1]. Figure 1(a) shows a schematic of a transmission-type MMI structure fabricated with an MMF sandwiched between single-mode fibers (SMFs) as input and output.…”

Section: Introductionmentioning

confidence: 99%

Reflection-type fiber-optic multimode interference structure with rounded end-face: A temperature-sensing study

Taue

Takahashi

Fukano

2015

2015 20th Microoptics Conference (MOC)

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We investigated a novel reflection technique for a reflection-type fiber-optic multimode interference structure. Rounding the fiber end-face increased the reflected light intensity by more than 10 dB, with no reflection coating. We demonstrated the use of our multimode interference structure as a temperature sensor by immersing the sensing region in temperature-controlled silicone oil. The resulting sensitivity was 0.028 °C for a 29.60-mm sensing region.

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“…However, if one considers the evanescent field produced at the CSF/external medium interface, the diameter can be considered as an effective value of D CSF + 2Z, where Z is the penetration depth. This parameter can be calculated through Equation (2) [34]:…”

Section: Introductionmentioning

confidence: 99%

Relative Humidity Fiber Sensor Based on Multimode Interferometer Coated with Agarose-Gel

2018

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In this work, a relative humidity (RH) sensor based on a structure with multimode interference is proposed and experimentally demonstrated. The multimode sensor is fabricated by fusion splicing a coreless fiber section to a single mode fiber. A hydrophilic agarose gel is coated on the coreless fiber, using the dip coating technique. By changing the surrounding RH, the refractive index of the coated agarose gel will change, causing a wavelength shift of the peak in the reflection spectra. For RH variations in the range between 60.0%RH and 98.5%RH, the sensor presents a maximum sensitivity of 44.2 pm/%RH, and taking in consideration the interrogation system, a resolution of 0.5%RH is acquired. This sensor has a great potential in real time RH monitoring and can be of interest for applications where a control of high levels of relative humidity is required.Coatings 2018, 8, 453 2 of 9 and desorb water, and also to restore a fast equilibrium with atmospheric humidity. Besides that, it is extremely stable, not soluble in water and can be easily handled for device manufacture [23,31].In this work, a multimode interferometer based on a coreless fiber coated with agarose gel is proposed for the detection of RH. The sensor is easy to produce, presents good resolution, particularly for environments with values of RH higher than 60.0%RH. Sensor Fabrication and Operation Principle

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Sensitivity improvement of optical-fiber temperature sensor with solid cladding material based on multimode interference

Cited by 26 publications

References 25 publications

High sensitivity temperature sensor based on singlemode-no-core-singlemode fibre structure and alcohol

High sensitivity temperature sensor based on singlemode-no-core-singlemode fibre structure and alcohol

Reflection-type fiber-optic multimode interference structure with rounded end-face: A temperature-sensing study

Relative Humidity Fiber Sensor Based on Multimode Interferometer Coated with Agarose-Gel

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