A microbent fiber optic pH sensor

Lee, S. Thomas; Aneeshkumar, B.; Radhakrishnan, P.; Vallabhan, C. P. G.; Nampoori, V. P. N.

doi:10.1016/s0030-4018(02)01406-2

Cited by 34 publications

(7 citation statements)

References 12 publications

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“…Sulfophthalein based sensors have been prepared using styrene-divinylbenzene copolymers (refs ( 19 , 22 , 43 , 45 , 102 , 245 , 253 , 265 , 273 , 288 − 291 , 298 , and 306 )), agarose, 309 cellulose, 38 , 213 , 232 − 234 , 263 , 276 , 302 , 351 nylon-6 fibers, 241 PVA, 310 PVC, 232 − 234 , 296 PVI, 287 − 289 sol–gel (refs ( 194 , 226 , 252 , 254 , 255 , 257 ), ( 259 − 262 , 267 , 269 , 272 , 277 , 279 ), ( 281 − 284 , 286 , 293 , 294 ), ( 301 , 311 , 312 , 314 , 352 )), SiO 2 –TiO 2 composites, 246 , 247 , 266 , 316 and ormosils 254 , 256 , 258 , 264 , 268 , 270 , 271 , ...…”

Section: Overview Of Commonly Used Absorptiometric Ph Probesmentioning

confidence: 99%

“…Most popular indicator dyes for application in absorptiometric sensors belong to the group of azo-dyes, − ,,,,,− phthalein, ,,,,− sulfophthalein (ref , , , , , , , , , , , , , , , − , , − , − …”

Section: Overview Of Commonly Used Absorptiometric Ph Probesmentioning

confidence: 99%

“…Sulfophthalein based sensors have been prepared using styrene-divinylbenzene copolymers (refs , , , , , , , , , − , , and ), agarose, cellulose, ,,− ,,,, nylon-6 fibers, PVA, PVC, − , PVI, − sol–gel (refs , , , , , , − , , , , , , − , , , , , , , , ), SiO 2 –TiO 2 composites, ,,, and ormosils ,,,,,,,, as immobilization matrices.…”

Section: Overview Of Commonly Used Absorptiometric Ph Probesmentioning

confidence: 99%

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Optical Sensing and Imaging of pH Values: Spectroscopies, Materials, and Applications

2020

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This is the first comprehensive review on methods and materials for use in optical sensing of pH values and on applications of such sensors. The Review starts with an introduction that contains subsections on the definition of the pH value, a brief look back on optical methods for sensing of pH, on the effects of ionic strength on pH values and p K a values, on the selectivity, sensitivity, precision, dynamic ranges, and temperature dependence of such sensors. Commonly used optical sensing schemes are covered in a next main chapter, with subsections on methods based on absorptiometry, reflectometry, luminescence, refractive index, surface plasmon resonance, photonic crystals, turbidity, mechanical displacement, interferometry, and solvatochromism. This is followed by sections on absorptiometric and luminescent molecular probes for use pH in sensors. Further large sections cover polymeric hosts and supports, and methods for immobilization of indicator dyes. Further and more specific sections summarize the state of the art in materials with dual functionality (indicator and host), nanomaterials, sensors based on upconversion and 2-photon absorption, multiparameter sensors, imaging, and sensors for extreme pH values. A chapter on the many sensing formats has subsections on planar, fiber optic, evanescent wave, refractive index, surface plasmon resonance and holography based sensor designs, and on distributed sensing. Another section summarizes selected applications in areas, such as medicine, biology, oceanography, bioprocess monitoring, corrosion studies, on the use of pH sensors as transducers in biosensors and chemical sensors, and their integration into flow-injection analyzers, microfluidic devices, and lab-on-a-chip systems. An extra section is devoted to current challenges, with subsections on challenges of general nature and those of specific nature. A concluding section gives an outlook on potential future trends and perspectives.

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Section: Overview Of Commonly Used Absorptiometric Ph Probesmentioning

confidence: 99%

Section: Overview Of Commonly Used Absorptiometric Ph Probesmentioning

confidence: 99%

Section: Overview Of Commonly Used Absorptiometric Ph Probesmentioning

confidence: 99%

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Optical Sensing and Imaging of pH Values: Spectroscopies, Materials, and Applications

2020

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“…In order to obtain an accurate, precise, highly sensitive and broad range pH sensor, mixture of multiple pH indicators [ 25 , 26 , 27 , 28 ] are introduced into the sol-gel matrix. These sensors are not only used for typical pH measurements but are also employed in different industrial applications for degree of acidity measurements.…”

Section: Sol-gel Based Chemical Sensorsmentioning

confidence: 99%

Chemical Sensors Based on Molecularly Imprinted Sol-Gel Materials

2010

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The sol-gel technique is earning the worldwide attention of researchers in the field of material science, due to its versatility in synthesizing inorganic ceramic materials at mild conditions. High purity, homogeneity, controlled porosity, stable temperature and nanoscale structuring are the most remarkable features offered by this method for generating highly sensitive and selective matrices to incorporate analyte molecules. The crafting of sol-gel sensors through molecular imprinting has put great influence on the development of innovative chemical sensors, which can be seen from the growing number of publications in this field. The review provides a brief overview of sol-gel sensor applications, and discusses the contribution of molecular imprinting in exploring the new world of sensors.

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“…Use of optical fibre based sensors provides an easy, quick and accurate method to measure the water quality. Over the years, different fibre optic sensors (FOSs) have been developed to monitor various environmental pollutants [1][2][3][4][5][6]. The most attractive feature of FOSs is that whenever an in situ study is necessary, they are able to serve as both the sensing element and the signal transmission medium, allowing the electronic instrumentation to be located remotely from the measurement site.…”

Section: Introductionmentioning

confidence: 99%

Evanescent wave fibre optic sensors for trace analysis of Fe³in water

Lee

Kumar

Unnikrishnan

et al. 2003

Meas. Sci. Technol.

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In this communication, we discuss the details of fabricating an off-line fibre optic sensor (FOS) based on evanescent wave absorption for detecting trace amounts of Fe 3+ in water. Two types of FOS are developed; one type uses the unclad portion of a multimode silica fibre as the sensing region whereas the other employs the microbent portion of a multimode plastic fibre as the sensing region. Sensing is performed by measuring the absorption of the evanescent wave in a reagent medium surrounding the sensing region. To evaluate the relative merits of the two types of FOS in Fe 3+ sensing, a comparative study of the sensors is made, which reveals the superiority of the latter in many respects, such as smaller sensing length, use of a double detection scheme (for detecting both core and cladding modes) and higher sensitivity of cladding mode detection at an intermediate range of concentration along with the added advantage that plastic fibres are inexpensive. A detection limit of 1 ppb is observed in both types of fibre and the range of detection can be as large as 1 ppb-50 ppm. All the measurements are carried out using a LabVIEW set-up.

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A microbent fiber optic pH sensor

Cited by 34 publications

References 12 publications

Optical Sensing and Imaging of pH Values: Spectroscopies, Materials, and Applications

Optical Sensing and Imaging of pH Values: Spectroscopies, Materials, and Applications

Chemical Sensors Based on Molecularly Imprinted Sol-Gel Materials

Evanescent wave fibre optic sensors for trace analysis of Fe³in water

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A microbent fiber optic pH sensor

Cited by 34 publications

References 12 publications

Optical Sensing and Imaging of pH Values: Spectroscopies, Materials, and Applications

Optical Sensing and Imaging of pH Values: Spectroscopies, Materials, and Applications

Chemical Sensors Based on Molecularly Imprinted Sol-Gel Materials

Evanescent wave fibre optic sensors for trace analysis of Fe3 in water

Contact Info

Product

Resources

About

Evanescent wave fibre optic sensors for trace analysis of Fe³in water