Fiber optic evanescent field absorption sensor: effect of launching condition and the geometry of the sensing region

Gupta, Banshi D.; Singh, Chetan; Sharma, Anurag

doi:10.1117/12.167173

Cited by 68 publications

(19 citation statements)

References 8 publications

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“…Based on the measurement of evanescence wave adsorption [5,7,14,17,23,28,29], optical fiber sensors are increasingly used. There is a growing interest in this method due to the fact that there is fast implantation of optical fiber probes, which are adapted for in situ measurements, and there is no need of a reference electrode or several samples [7].…”

Section: Introductionmentioning

confidence: 99%

Effects of immersion duration and temperature on mechanical properties of optical fibers aged in CTAC aqueous solution

Abdi

Rujinski

Poulain

2015

Engineering Science and Technology, an International Journal

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International audienceFiber-optic sensors are mostly used for in situ measurements of diverse chemical composition of industrial surfactants employed in industry as detergents, emulsifying and dispersing agents, coatings, and pharmaceutical adjuvants. These optical sensors are often used in wet chemical environments in which the temperature can be high. The purpose of this work is to study the mechanical behavior of optical fibers in contact with CetylTrimethylAmmonium Chloride in aqueous solution (CTAC) at different immersion durations and different temperatures. Result analysis demonstrates that immersion in CTAC drastically decreases the fiber strength particularly when immersed for long aging periods at high temperatures. Based on the analysis of aged fiber surface morphology obtained from Scanning Electron Microscopy, the extent of the damage of the fiber core and polymer coatings was observed

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Section: Introductionmentioning

confidence: 99%

Effects of immersion duration and temperature on mechanical properties of optical fibers aged in CTAC aqueous solution

Abdi

Rujinski

Poulain

2015

Engineering Science and Technology, an International Journal

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“…In recent years, evanescent field absorption fiber optic sensors have become increasingly popular for remote and distributed sensing applications [9][10][11]. The main advantage of these sensors is that one can monitor the parameter of interest in real time.…”

Section: Introductionmentioning

confidence: 99%

Study of fiber optic sugar sensor

et al. 2006

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Over the last two decades, the fiber optic technology has passed through many analytical stages. Some commercially available fiber optic sensors, though in a small way, are being used for automation in mechanical and industrial environments. They are also used for instrumentation and controls.In the present work, an intensity-modulated intrinsic fiber optic sugar sensor is presented. This type of sensor, with slight modification, can be used for on-line determination of the concentration of sugar content in sugarcane juice in sugar industry.In the present set-up, a plastic fiber made of polymethylmethacrylate is used. A portion of the cladding (1 cm, 2 cm, 3 cm) at the mid-point along the length of the fiber is removed. This portion is immersed in sugar solution of known concentration and refractive index. At one end of the fiber an 850 nm source is used and at the other end a power meter is connected. By varying the concentration of sugar solution, the output power is noted. These studies are made due to the change in refractive index of the fluid. The device was found to be very sensitive which is free from EMI and shock hazards, stable and repeatable and they can be remotely interfaced with a computer to give on-line measurements and thus become useful for application in sugar industries.

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“…As is well known, the power transmitted through an optical fiber is not fully confined inside the core of the fiber, but a fraction of it travels through the cladding. 6 This fraction of the guided power in the cladding region is termed the evanescent field, and it can be utilized for fabricating various types of fiber optic chemical sensors. 7 To use an optical fiber in the evanescent wave sensing configuration, usually a part of the cladding is removed from a region that is then surrounded with a medium whose absorbance or refractive index changes with the concentration of the species.…”

Section: Introductionmentioning

confidence: 99%

Microbent optical fibers as evanescent wave sensors

et al. 2002

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Microbent optical fibers are potential candidates for evanescent wave sensing. We investigate the behavior of a permanently microbent fiber optic sensor when it is immersed in an absorbing medium. Two distinct detection schemes, namely, bright-field and dark-field detection configuration, are employed for the measurements. The optical power propagating through the sensor is found to vary in a logarithmic fashion with the concentration of the absorbing species in the surrounding medium. We observe that the sensitivity of the setup is dependent on the bending amplitude and length of the microbend region for the brightfield detection scheme, while it is relatively independent of both for the dark-field detection configuration. This feature can be exploited in compact sensor designs where reduction of the sensing region length is possible without sacrificing sensitivity. © 2002 Society of Photo-Optical Instrumentation Engineers.

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Fiber optic evanescent field absorption sensor: effect of launching condition and the geometry of the sensing region

Cited by 68 publications

References 8 publications

Effects of immersion duration and temperature on mechanical properties of optical fibers aged in CTAC aqueous solution

Effects of immersion duration and temperature on mechanical properties of optical fibers aged in CTAC aqueous solution

Study of fiber optic sugar sensor

Microbent optical fibers as evanescent wave sensors

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