No-core fiber-based highly sensitive optical fiber pH sensor

Bhardwaj, Vanita; Pathak, Akhilesh Kumar; Singh, Vinod Kumar

doi:10.1117/1.jbo.22.5.057001

Cited by 25 publications

(16 citation statements)

References 23 publications

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“…15 Bhardwaj et al reported a no-core OFS using a sol-gel technique and three pH indicators to achieve a wide pH range, i.e., between 2 and 13. 18 The developed sensor showed a sensitivity of 1.02 and 0.93 nm pH À1 for acidic and alkaline solutions, respectively. However, the application of this type of sensor in the eld of civil engineering is still far from being ready for the market.…”

Section: Introductionmentioning

confidence: 91%

“…In recent years, several OFS functionalised with sol-gel membranes have been reported, including for pH sensing. [12][13][14][15][16][17][18] Pathak and Singh developed a down-tapered OFS for pH monitoring using three pH indicators in a sol-gel membrane with a maximum sensitivity of 0.49 dBm pH À1 . 14 Timbó et al also used a pH indicator (bromocresol purple) on a sol-gel matrix, resulting in a sensor with acceptable linearity between a pH of 4 and 10.…”

Section: Introductionmentioning

confidence: 99%

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Organic–inorganic hybrid sol–gel materials doped with a fluorescent triarylimidazole derivative

et al. 2021

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Section: Introductionmentioning

confidence: 91%

Section: Introductionmentioning

confidence: 99%

Organic–inorganic hybrid sol–gel materials doped with a fluorescent triarylimidazole derivative

et al. 2021

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“…The development of OFS functionalized with OIH materials has already been reported for application in several fields, including biomedical [52], civil engineering [28,[62][63][64], and environment [48,56,65]. Bhardwaj et al [66] reported the development of an OFS for pH detection with different indicators, namely bromophenol blue, cresol red, and chlorophenol red, achieving a pH range between 2 and 13. A shift in resonance wavelength towards blue in alkaline solutions (−0.93 nm/pH) and a shift in resonance wavelength towards red in acidic solutions (1.02 nm/pH) were found.…”

Section: Applicationsmentioning

confidence: 99%

Sol-Gel Coating Membranes for Optical Fiber Sensors for Concrete Structures Monitoring

et al. 2021

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The use of advanced sensing devices for concrete and reinforced concrete structures (RCS) is considered a rational approach for the assessment of repair options and scheduling of inspection and maintenance strategies. The immediate benefits are cost reduction and a reliable prevention of unpredictable events. The use of optical fiber sensors (OFS) for such purposes has increased considerably in the last few years due to their intrinsic advantages. In most of the OFS, the chemical transducer consists of immobilized chemical reagents placed in the sensing region of the optical sensor by direct deposition or by encapsulation in a polymeric matrix. The choice of the support matrix impacts directly on the performance of the OFS. In the last two decades, the development of OFS functionalized with organic–inorganic hybrid (OIH) sol–gel membranes have been reported. Sol–gel route is considered a simple method that offers several advantages when compared to traditional synthesis processes, allowing to obtain versatile materials with unique chemical and physical properties, and is particularly valuable in the design of OIH materials. This review will provide an update of the current state-of-the-art of the OFS based on OIH sol-gel materials for concrete and RCS since 2016 until mid-2021. The main achievements in the synthesis of OIH membranes for deposition on OFS will be discussed. The challenges and future directions in this field will also be considered, as well as the main limitations of OFS for RCS monitoring.

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“…Therefore, various research on non-glass pH sensors [ 8 , 9 ] is gradually becoming a hot spot. Optical pH sensors recently drew increased attention from researchers and users for its stable measurement signal, ease of transport, strong anti-electromagnetic-interference properties, pollution-free nature, and other advantages [ 10 , 11 ].…”

Section: Introductionmentioning

confidence: 99%

Preparation and Optimization of Optical pH Sensor Based on Sol-Gel

Zhang

Zhou

2018

Sensors

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Making use of the sol-gel technique, an optical pH sensor was prepared, which was made from an organic carrier with four indictors including congo red, bromophenol blue, cresol red, and chlorophenol red, cross-linked by tetraethyl orthosilicate (TEOS) and cellulose acetate. The actual detection range of the optical pH sensor is 2.5–11.0. The optimal ratio of ethyl orthosilicate, absolute ethanol, deionized water, and hydrochloric acid in glue precursor of the sensor-sensitive membrane was explored. The orthogonal experiment was designed to optimize the dosage of cellulose acetate, N,N-dimethylformamide (DMF), indicator, hydrochloric acid, and precursor glue in preparing the sensor-sensitive membrane. The linearity, measurement accuracy, repeatability, stability, and response time of the prepared pH sensor were tested. The measurement results were analyzed using a support vector machine and linear regression. The experimental results show that the optical pH sensor has a measurement accuracy of up to 0.2 pH and better stability and repeatability than the traditional pH glass electrode.

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No-core fiber-based highly sensitive optical fiber pH sensor

Cited by 25 publications

References 23 publications

Organic–inorganic hybrid sol–gel materials doped with a fluorescent triarylimidazole derivative

Organic–inorganic hybrid sol–gel materials doped with a fluorescent triarylimidazole derivative

Sol-Gel Coating Membranes for Optical Fiber Sensors for Concrete Structures Monitoring

Preparation and Optimization of Optical pH Sensor Based on Sol-Gel

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