Crossed Optical Fiber Sensor Arrays for High-Spatial-Resolution Sensing: Application to Dissolved Oxygen Concentration Measurements

Rigo, Maria Veronica; Geissinger, Peter

doi:10.1155/2012/464092

Cited by 10 publications

(6 citation statements)

References 57 publications

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“…Both characteristics have not been investigated in the course of this study but should be considered in future applications. The calculated LOD of 0.25% airsat lies within the range of other conceptually similar sensor systems. ,− The maximum spatial resolution obtainable without signal smearing, that is, overlapping illumination points, is theoretically equal to the size of a single illumination point, which is estimated to be approximately 3 mm based on the diameter of the POF (2 mm) and the scattering of light through the 1 mm wall of the tubular sensing element. However, it should be noted that this value should be considered merely theoretical as smearing of emission light between adjacent illumination points will not only reduce the actual resolution but, moreover, affect measured signals and thus calculated oxygen concentrations …”

Section: Resultssupporting

confidence: 54%

Automated in Situ Oxygen Profiling at Aquatic–Terrestrial Interfaces

Brandt¹,

Vieweg²,

Laube³

et al. 2017

Environ. Sci. Technol.

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Optical sensing technologies provide opportunities for in situ oxygen sensing capable of capturing the whole range of spatial and temporal variability. We developed a miniaturized Distributed Oxygen Sensor ("mDOS") specifically for long-term in situ application in soil and sediment. The mDOS sensor system enables the unattended, repeated acquisition of time series of in situ oxygen profiles at a subcentimeter resolution covering a depth of up to one meter. As compared to existing approaches, this provides the possibility to reveal highly variable and heterogeneous oxygen dynamics at a high, quasi-continuous resolution across both scales. The applicability of the mDOS to capture both intra- and interday fine-scale variability of spatiotemporal oxygen dynamics under varying hydrological conditions is exemplarily demonstrated. We specifically aim at estimating the dependency between oxygen dynamics and hydrologic conditions along the measured profiles. The mDOS system enables highly detailed insights into oxygen dynamics in various aquatic and terrestrial environments and in the inherent transition zones between them. It thus represents a valuable tool to capture oxygen dynamics to help disentangling the coupling between underlying hydrological and biogeochemical process dynamics.

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Section: Resultssupporting

confidence: 54%

Automated in Situ Oxygen Profiling at Aquatic–Terrestrial Interfaces

Brandt¹,

Vieweg²,

Laube³

et al. 2017

Environ. Sci. Technol.

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“…The experimental results indicated that 5-layer or 50-layers showed the best sensitivity and reproducibility. However, other matrices of sol-gel nature [40,41,42,43] or good organic polymeric matrices [44,45] can be also found in the bibliography for the immobilization of Ru complexes. Most of these chemical indicators respond to the excitation light by emitting a fluorescence signal near 650 nm (red color), showing a relatively large Stokes shift.…”

Section: Polymers As a Support Of The Sensitive Elementmentioning

confidence: 99%

“…A work based on crossed optical fiber sensor arrays for dissolved oxygen (DO) concentration measurements is presented in [44]. In this configuration, there is an “excitation fiber” that guides the excitation light and the luminescence is captured by a second fiber, the “detection fibers” which is placed at right angle to the “excitation fiber”.…”

Section: Polymers As a Support Of The Sensitive Elementmentioning

confidence: 99%

Optical Fiber Sensors Based on Polymeric Sensitive Coatings

2018

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Abstract:Polymer technology is one of the fastest growing fields of contemporary research due to the possibility of using a wide variety of synthetic chemical routes for obtaining a polymeric network with a well-defined structure, resulting in materials with outstanding macroscopic properties. Surface engineering techniques based on the implementation of polymeric structures can be used as an interesting tool for the design of materials with functional properties. In this sense, the use of fabrication techniques for the design of nanostructured polymeric coatings is showing an important growth due to the intrinsic advantages of controlling the structure at a nanoscale level because physical, chemical, or optical properties can be considerably improved in comparison with the bulk materials. In addition, the presence of these sensitive polymeric coatings on optical fiber is a hot topic in the scientific community for its implementation in different market niches because a wide variety of parameters can be perfectly measured with a high selectivity, sensitivity, and fast response time. In this work, the two main roles that a polymeric sensitive matrix can play on an optical fiber for sensing applications are evaluated. In a first section, the polymers are used as a solid support for the immobilization of specific sensitive element, whereas in the second section the polymeric matrix is used as the chemical transducer itself. Additionally, potential applications of the optical fiber sensors in fields as diverse as biology, chemistry, engineering, environmental, industry or medicine will be presented in concordance with these two main roles of the polymeric sensitive matrices.

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“…In addition to high spatial resolution, one major advantage of the crossed-fiber sensor architecture is the reduction of the background signal, because only the sensor luminescence is captured by the second fiber in the ideal case. We have successfully applied this sensor architecture for measuring pH and temperature as well as dissolved oxygen and zinc(II) concentrations in water [12][13][14][15][16].…”

Section: Introductionmentioning

confidence: 99%

Absorption-Modulated Crossed-Optical Fiber-Sensor Platform for Measurements in Liquid Environments and Flow Streams

Henning

Geissinger

2017

Journal of Sensors

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A new evanescent-wave fiber sensor is described that utilizes absorption-modulated luminescence (AML) in combination with a crossed-fiber sensor platform. The luminescence signals of two crossed-fiber reference regions, placed on opposite sides of the stretch of fiber supporting the absorbance sensor, monitor the optical intensity in the fiber core. Evanescent absorption of the sensor reduces a portion of the excitation light and modulates the luminescence of the second reference region. The attenuation is determined from the luminescence intensity of both reference regions similar to the Beer-Lambert Law. The AML-Crossed-Fiber technique was demonstrated using the absorbance of the Zn(II)-PAN 2 complex at 555 nm. A linear response was obtained over a zinc(II) concentration range of 0 to 20 M (approximately 0 to 1.3 ppm). A nonlinear response was observed at higher zinc(II) concentrations and was attributed to depletion of higher-order modes in the fiber. This was corroborated by the measured induced repopulation of these modes.

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Crossed Optical Fiber Sensor Arrays for High-Spatial-Resolution Sensing: Application to Dissolved Oxygen Concentration Measurements

Cited by 10 publications

References 57 publications

Automated in Situ Oxygen Profiling at Aquatic–Terrestrial Interfaces

Automated in Situ Oxygen Profiling at Aquatic–Terrestrial Interfaces

Optical Fiber Sensors Based on Polymeric Sensitive Coatings

Absorption-Modulated Crossed-Optical Fiber-Sensor Platform for Measurements in Liquid Environments and Flow Streams

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