A bandwidth response humidity sensor with micro-nano fibre Bragg grating

Li, Pengfei; Yan, Haitao; Xie, Zhanwu; Zhao, Xiaoxiao; Han, Daofu

doi:10.1016/j.yofte.2019.101998

Cited by 15 publications

(5 citation statements)

References 23 publications

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“…The relative humidity obtained from the coated FBG RH sensor could provide RH information and compensate for the FOS-based smart concrete sensing system. For in situ application, some researchers have packaged the sensor and embedded it in concrete [ 16 ], and the test results match with the lab experiment. However, the size of the packaged sensor is bulk and needs to be miniaturized in future studies.…”

Section: Fiber Bragg Grating (Fbg) Sensormentioning

confidence: 85%

Fiber Optic-Based Durability Monitoring in Smart Concrete: A State-of-Art Review

Qiao,

Lin,

Sun

et al. 2023

Sensors

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Concrete is the most commonly used construction material nowadays. With emerging cutting-edge technologies such as nanomaterials (graphene, carbon nanotubes, etc.), advanced sensing (fiber optics, computer tomography, etc.), and artificial intelligence, concrete can now achieve self-sensing, self-healing, and ultrahigh performance. The concept and functions of smart concrete have thus been partially realized. However, due to the wider application location (coastal areas, cold regions, offshore, and deep ocean scenarios) and changing climate (temperature increase, more CO2 emissions, higher moisture, etc.), durability monitoring (pH, ion penetration, carbonation, corrosion, etc.) becomes an essential component for smart concrete. Fiber optic sensors (FOS) have been widely explored in recent years for concrete durability monitoring due to their advantages of high sensitivity, immunity to harsh environments, small size, and superior sensitivity. The purpose of this review is to summarize FOS development and its application in concrete durability monitoring in recent years. The objectives of this study are to (1) introduce the working principle of FOS, including fiber Bragg grating (FBG), long-period fiber grating (LPFG), surface plasmon resonance (SPR), fluorescence-based sensors, and distributed fiber optic sensors (DFOS); (2) compare the sensitivity, resolution, and application scenarios of each sensor; and (3) discuss the advantages and disadvantages of FOS in concrete durability monitoring. This review is expected to promote technical development and provide potential research paths in the future for FOS in durability monitoring in smart concrete.

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Section: Fiber Bragg Grating (Fbg) Sensormentioning

confidence: 85%

Fiber Optic-Based Durability Monitoring in Smart Concrete: A State-of-Art Review

Qiao,

Lin,

Sun

et al. 2023

Sensors

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“…where the waist zone radius is r w , the waist zone length is L, and the transition zone radius decreases with the fiber diameter, δ r w is a change in the radius and δx is a change in the length after the fiber is stretched [23]. From Eq.…”

Section: Sensor Fabricationmentioning

confidence: 99%

A refractive index sensor based on micro-nano fiber with chirped fiber Bragg grating embedded for a microfluidic chip

Zhanwu Xie,

Haitao Yan,

Pengfei Li

2023

Optica Applicata

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A refractive index (RI) sensor based on micro-nano fiber (MN-fiber) with chirped fiber Bragg grating (CFBG) Fabry–Perot cavity (FP-cavity) for a microfluidic chip has been proposed. A single-mode fiber is drawn by hydrogen flame heading come into MN-fiber. Two CFBGs are written into this MN-fiber by the ultraviolet (UV) laser mask exposure method. One is at the tapered region, another is at the micro-nano region. Then a micro-nano fiber with chirped fiber Bragg grating (MN-CFBGs) FP-cavity sensor is formed. The Bragg reflection wavelengths of two CFBGs are 1620 nm, 3-dB bandwidth are above 50 nm. The reflectance of two CFBGs are 70% and 99%, respectively. The effects of reflectivity and bandwidth of the CFBGs FP-cavity, diameter and length of MN-fiber with this sensor’s optical properties are analysed is and discussed. This sensor is embedded in a microfluidic chip and the MN-fiber region is immersion microfluid in different channels. The experimental results show that refractive index sensitivity of the sensor is –986 nm/refractive index unit (RIU), and the signal of the sensor has little noise. The CFBG-FP sensor not only has high sensitivity and lager measurement range, but also high contrast resonance signal and stability.

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“…An optical microfiber has many sensing applications, such as measuring the refractive index (RI) [ 1 ] and humidity [ 2 ], as the evanescent field on the surface of a microfiber easily interacts with the external environment [ 3 ]. The optical microfiber modal interferometer operating near the dispersion turning point (DTP) has been intensively investigated due to its ultra-high RI sensitivity [ 4 , 5 ].…”

Section: Introductionmentioning

confidence: 99%

Dispersion Turning Attenuation Microfiber for Flowrate Sensing

Tang,

Wang,

Wang

et al. 2023

Sensors

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We demonstrated a new optical fiber modal interferometer (MI) for airflow sensing; the novelty of the proposed structure is that an MI is fabricated based on a piece of HAF, which makes the sensitive MI itself also a hotwire. The interferometer is made by applying arc-discharge tapering and then flame tapering on a 10 mm length high attenuation fiber (HAF, 2 dB/cm) with both ends spliced to a normal single mode fiber. When the diameter of the fiber in the processing region is reduced to about 2 μm, the near-infrared dispersion turning point (DTP) can be observed in the interferometer’s transmission spectrum. Due to the absorption of the HAF, the interferometer will have a large temperature increase under the action of a pump laser. At the same time, the spectrum of the interferometer with a DTP is very sensitive to the change in ambient temperature. Since airflow will significantly affect the temperature around the fiber, this thermosensitive interferometer with an integrated heat source is suitable for airflow sensing. Such an airflow sensor sample with a 31.2 mm length was made and pumped by a 980 nm laser with power up to 200 mW. In the comparative experiment with an electrical anemometer, this sensor exhibits a very high air-flow sensitivity of −2.69 nm/(m/s) at a flowrate of about 1.0 m/s. The sensitivity can be further improved by enlarging the waist length, increasing the pump power, etc. The optical anemometer with an extremely high sensitivity and a compact size has the potential to measure a low flowrate in constrained microfluidic channels.

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A bandwidth response humidity sensor with micro-nano fibre Bragg grating

Cited by 15 publications

References 23 publications

Fiber Optic-Based Durability Monitoring in Smart Concrete: A State-of-Art Review

Fiber Optic-Based Durability Monitoring in Smart Concrete: A State-of-Art Review

A refractive index sensor based on micro-nano fiber with chirped fiber Bragg grating embedded for a microfluidic chip

Dispersion Turning Attenuation Microfiber for Flowrate Sensing

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