Optical Aspects of Na+ Ions Adsorption on Sol-Gel Porous Films Used in Optical Fiber Sensors

Rayss, Jan; Sudolski, Grzegorz; Gorgol, Andrzej; Janusz, W.; Gałgan, Anna

doi:10.1006/jcis.2002.8347

Cited by 6 publications

(2 citation statements)

References 9 publications

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“…10,11 Owing to its cost effective and simple procedure, the sol-gel technique was used for immobilization of pHsensitive dyes on the fiber surface. [12][13][14][15][16] Sol-gel technology has many advantages over other film deposition methods. In aggressive environments, the sol-gel film is more resistant, inert, and tough compared to polymer films.…”

Section: Introductionmentioning

confidence: 99%

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

2017

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The present work describes the fabrication and characterization of an optical fiber pH sensor using a sol–gel technique. The sensing head configuration is incorporated using a short section of no-core fiber, coated with tetraethyl orthosilicate and spliced at the end of a single mode fiber with a bulge. Different types of indicators (bromophenol blue, cresol red, and chlorophenol red) were used to achieve a wide pH range from 2 to 13. High sensitivities of the fabricated device were found to be 1.02 and ? 0.93 ?? nm / pH for acidic and alkaline solutions, respectively. From the characterization results, it was noted that there is an impact of ionic strength and an effect of the temperature of liquid on the response characteristic, which is an advantage of the existing device over the other pH sensors. The fabricated sensor exhibited good reflection spectrum, indicating a blueshift in resonance wavelength for alkaline solutions and a redshift for acidic solutions.

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Section: Introductionmentioning

confidence: 99%

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

2017

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“…Since chloride remains an important ion for sensing applications in physiological samples, much effort have been involved to develop suitable chloride ion sensors for use in chemical sensor applications. However, as has happened with other types of ion-concentration optical sensors [ 7 – 11 ], only a limited number of highly selective optical chloride sensors have been reported [ 6 , 12 – 16 ]. The most commonly reported techniques, in conjunction with an optical fiber, are based on the development of sensitive sensing materials as matrix for entrapment of optical transducers that can provide the function of selective exaction and chemical recognition of the analyte, a few examples such as fluorescence quenching of a fluorophore immobilized on a polymeric matix [ 8 ], Na + ions adsorption on sol-gen porous film [ 11 ], and ion-selective membranes deposited on dielectric waveguides [ 9 , 10 ].…”

Section: Introductionmentioning

confidence: 99%

A Microfluidic Long-Period Fiber Grating Sensor Platform for Chloride Ion Concentration Measurement

Wang

2011

Sensors

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Optical fiber sensors based on waveguide technology are promising and attractive in chemical, biotechnological, agronomy, and civil engineering applications. A microfluidic system equipped with a long-period fiber grating (LPFG) capable of measuring chloride ion concentrations of several sample materials is presented. The LPFG-based microfluidic platform was shown to be effective in sensing very small quantities of samples and its transmitted light signal could easily be used as a measurand. The investigated sample materials included reverse osmosis (RO) water, tap water, dilute aqueous sample of sea sand soaked in RO water, aqueous sample of sea sand soaked in RO water, dilute seawater, and seawater. By employing additionally a chloride ion-selective electrode sensor for the calibration of chloride-ion concentration, a useful correlation (R2 = 0.975) was found between the separately-measured chloride concentration and the light intensity transmitted through the LPFG at a wavelength of 1,550 nm. Experimental results show that the sensitivity of the LPFG sensor by light intensity interrogation was determined to be 5.0 × 10−6 mW/mg/L for chloride ion concentrations below 2,400 mg/L. The results obtained from the analysis of data variations in time-series measurements for all sample materials show that standard deviations of output power were relatively small and found in the range of 7.413 × 10−5−2.769 × 10−3 mW. In addition, a fairly small coefficients of variations were also obtained, which were in the range of 0.03%–1.29% and decreased with the decrease of chloride ion concentrations of sample materials. Moreover, the analysis of stability performance of the LPFG sensor indicated that the random walk coefficient decreased with the increase of the chloride ion concentration, illustrating that measurement stability using the microfluidic platform was capable of measuring transmitted optical power with accuracy in the range of −0.8569 mW/ h to −0.5169 mW/ h. Furthermore, the bias stability was determined to be in the range of less than 6.134 × 10−8 mW/h with 600 s time cluster to less than 1.412 × 10−6 mW/h with 600 s time cluster. Thus, the proposed LPFG-based microfluidic platform has the potential for civil, chemical, biological, and biochemical sensing with aqueous solutions. The compact (3.5 × 4.2 cm), low-cost, real-time, small-volume (∼70 μL), low-noise, and high-sensitive chloride ion sensing system reported here could hopefully benefit the development and applications in the field of chemical, biotechnical, soil and geotechnical, and civil engineering.

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Fiber optic pH sensor based on mode-filtered light detection

Wenping

Qiu

et al. 2010

Sensors and Actuators B: Chemical

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Optical Aspects of Na+ Ions Adsorption on Sol-Gel Porous Films Used in Optical Fiber Sensors

Cited by 6 publications

References 9 publications

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

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

A Microfluidic Long-Period Fiber Grating Sensor Platform for Chloride Ion Concentration Measurement

Fiber optic pH sensor based on mode-filtered light detection

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