Effects of Polymer Coatings on Temperature Sensitivity of Brillouin Frequency Shift Within Double-Coated Fibers

Gu, Hong; Dong, Huijuan; Zhang, Guangyu; He, Jun; Pan, Haiyan

doi:10.1109/jsen.2012.2230438

Cited by 17 publications

(10 citation statements)

References 17 publications

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“…A third sample consisting of only PBS buffer acted as a control. Since Brillouin frequency shifts strongly depend upon the temperature of the sample , all three solutions were placed in the room housing the spectrometer for several hours prior to data acquisition to thermally equilibrate the samples with the environment, and were then placed in quartz cuvettes. In order to determine the sensitivity of the screening method to larger protein concentrations, a small amount of both body‐similar samples were also placed in dialysis cassettes (Slide‐A‐Lyzer, 2K MWCO, 3 mL), which were immersed in a high molecular weight poly(ethylene glycol), MW = 3350, and allowed to dialyze for 100 minutes.…”

Section: Methodsmentioning

confidence: 99%

Brillouin spectroscopy as a new method of screening for increased CSF total protein during bacterial meningitis

Steelman

Meng

Traverso

et al. 2014

Journal of Biophotonics

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Bacterial meningitis is a disease of pronounced clinical significance, especially in the developing world. Immediate treatment with antibiotics is essential, and no single test can provide a conclusive diagnosis. It is well established that elevated total protein in cerebrospinal fluid (CSF) is associated with bacterial meningitis. Brillouin spectroscopy is a widely used optical technique for noninvasive determination of the elastic moduli of materials. We found that elevated protein levels in CSF alter the fluid elasticity sufficiently to be measurable by Brillouin spectroscopy, with model healthy and diseased fluids distinguishable to marked significance (P = 0.014), which increases with sample concentration by dialysis. Typical raw output of a 2-stage VIPA Brillouin spectrometer: inelastically scattered Brillouin peaks (arrows) and elastically scattered incident radiation (center cross).

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Section: Methodsmentioning

confidence: 99%

Brillouin spectroscopy as a new method of screening for increased CSF total protein during bacterial meningitis

Steelman

Meng

Traverso

et al. 2014

Journal of Biophotonics

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“…This results from a positive pressure forming on the SiO 2 component of the core glass as the temperature is increased. Similarly, and as discussed previously, the fiber could be coated in a material that strains the silica as the temperature is increased and thereby enhancing the thermal sensitivity [106,107].…”

Section: Discussionmentioning

confidence: 89%

“…Deviation from them depends on the absolute fiber configuration, coating, and glass composition. For instance, it has been shown [106,107] that one can enhance the thermal sensitivity with a coating of high coefficient of thermal expansion (CTE). Going in the other direction, a reversal of the sign of the thermal response was demonstrated by using a high-CTE core cladded in low-CTE silica [34].…”

Section: The Materialsmentioning

confidence: 99%

A Brief Review of Specialty Optical Fibers for Brillouin-Scattering-Based Distributed Sensors

Dragic

Ballato

2018

Applied Sciences

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Specialty optical fibers employed in Brillouin-based distributed sensors are briefly reviewed. The optical and acoustic waveguide properties of silicate glass optical fiber first are examined with the goal of constructing a designer Brillouin gain spectrum. Next, materials and their effects on the relevant Brillouin scattering properties are discussed. Finally, optical fiber configurations are reviewed, with attention paid to fibers for discriminative or other enhanced sensing configurations. The goal of this brief review is to reinforce the importance of fiber design to distributed sensor systems, generally, and to inspire new thinking in the use of fibers for this sensing application.

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“…Here, C T is the Brillouin frequency shift with the temperature of the bare single-mode fiber (including fiber coating) that is calibrated to be at a constant value, with a value of 1.01 MHz/ • C [7], strain coefficient C was measured to be 0.048 MHz/µ [11], and d represents the axial strain along the fiber caused by the thermal-expansion mismatch of the fiber and the jacket material. The jacket effects are commonly modeled by Lamé solutions [12], in which the jacketed fiber is considered to have a multilayer structure as indicated in Figure 3.…”

Section: Measurement Principlementioning

confidence: 99%

“…In practical applications, the tight-buffered fiber is widely used in distributed fiberoptic sensors. It is important to note that, the coating material influences the measured Brillouin frequency shift variation with temperature [6,7]. Gu et al [7] performed a theoretical and experimental investigation of the effect of the polymer coating on the Brillouin frequency shift with temperature, however, the work concentrated on the temperature range above zero centigrade.…”

Section: Introductionmentioning

confidence: 99%

Detection of Thermal Strain in Steel Rails with BOTDA

Zhang

Bao

et al. 2018

Applied Sciences

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Rail transportation is one of the most important and efficient forms of transportation. Large thermal strain can develop in the rail steel due to extreme climatic conditions resulting in safety related issues. We carried out a thermal-strain monitoring test on the rail specimen over a large temperature range from −40 ∘ C to +50 ∘ C using a Brillouin optical time-domain analyzer (BOTDA) for the first time, to the best of our knowledge. Two jacketed fibers and small-diameter carbon/polyimide-coating single-mode fiber were used for the purpose of investigating the jacket effect of thermal-strain detection on the rail. Although a nonlinear response to the temperature of the loose jacketed fiber was found, it was applicable for thermal strain monitoring when glued on the surface of the rail sample. The measured thermal strain in the rail specimen was validated by the results obtained by the strain gauge. The thermally induced strain from the large rail specimen was found to have suppressed the nonlinear impact of the fiber jacket.

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Effects of Polymer Coatings on Temperature Sensitivity of Brillouin Frequency Shift Within Double-Coated Fibers

Cited by 17 publications

References 17 publications

Brillouin spectroscopy as a new method of screening for increased CSF total protein during bacterial meningitis

Brillouin spectroscopy as a new method of screening for increased CSF total protein during bacterial meningitis

A Brief Review of Specialty Optical Fibers for Brillouin-Scattering-Based Distributed Sensors

Detection of Thermal Strain in Steel Rails with BOTDA

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