A Fiber Optic Temperature Sensor Based on the Combination of Two Materials With Different Thermo-Optic Coefficients

Wildner, Wolfgang; Drummer, Dietmar

doi:10.1109/jsen.2015.2488979

Cited by 12 publications

(11 citation statements)

References 23 publications

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“…However, in reality, RI matching is far from simple, as impurities and cooling rates at production have a significant impact on the RIs. Also, the RIs of glass and polymers depend on temperature (thermo-optic coefficient) and measured wavelength (dispersion), which can be used for optical temperature sensors [15,16]. The RI of typical glasses increases with increasing temperature with a thermo-optic coefficient ∆n rel /∆T between −6.7 and 24.1 × 10 −6 /K 4 [17].…”

Section: Introductionmentioning

confidence: 99%

Optical and Mechanical Properties of Highly Transparent Glass-Flake Composites

et al. 2019

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In this paper, the dynamic mechanic and optical properties of composites made of Polyvinyl Butyral (PVB) and Micro Glass Flakes (MGF) with matching refractive indices (RIs) are investigated. The composite is produced by a slurry-based process using additional blade casting and lamination. It can be shown that a high degree of ordering of the MGF in the polymer matrix can be achieved with this method. This ordering, combined with the platelet-like structure of the MGF, leads to very efficient strengthening of the PVB with increasing content of the MGF. By carefully adjusting the RIs of the polymer, it is shown that haze is reduced to below 2%, which has not been achieved with irregular fillers or glass fibers.

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Section: Introductionmentioning

confidence: 99%

Optical and Mechanical Properties of Highly Transparent Glass-Flake Composites

et al. 2019

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“…Polymers have a negative thermo-optic coefficient, which is nearly two orders of magnitude higher 5 . These facts lead to a wavelength-dependent and at least temperature-dependent transmission of the aforementioned composites 6 .…”

Section: Polymer-glass Compound With Adjusted Refractive Indexmentioning

confidence: 99%

The Mechanical and Optical Properties of Injection-moulded PMMA, Filled with Glass Particles of a Matching Refractive Index

Wildner

Drummer

2017

Polymers and Polymer Composites

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In this paper, the optical and mechanical properties of injection-moulded plates (thickness: 1 mm) made of poly(methyl methacrylate) (PMMA) and glass particles as filler with a matching refractive index are investigated. Tests show that the orientation resulting from the injection moulding process greatly affects the tensile strength and elongation at break, whereas the elastic modulus merely depends on the filling degree, which is investigated up to 13 vol.%. In terms of the optical properties, the specimens' haze depends on the difference in the refractive index between a glass and polymer. However, the absolute value of haze increases with increasing filling degree and decreasing particle size. Surface defects resulting from the injection moulding process were found to be the primary reason for this haze, even with identical RI between PMMA and glass. *

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“…Solving equation 7for n Display and replacing n Display and n Prism(D) with the wavelength dependent RIs of the oil n() and Prism n Prism() leads to equation (8). By using sin d from equation 7, the oil's RI n() can be calculated as follows 43,44…”

Section: Optical Analysismentioning

confidence: 99%

“…This enables the material combination for fiber-optic temperature sensing. 7,8 For both, the production of transparent composites and the use of their specific transmission properties, it is important to describe and measure their optical properties. In a theoretical approach, the light scattering of small spherical particles can be calculated with Mie's Theory.…”

Section: Introductionmentioning

confidence: 99%

Light scattering of glass-particle filled matrices with similar refractive index

Wildner

Drummer

2018

Journal of Composite Materials

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If fillers can be added to transparent materials without losing transparency, then advantages like enhanced mechanical and thermal properties can be integrated. The investigated specimens consist of glass particles and refractive index oil as a model for transparent matrices with a very similar refractive index. Their optical properties and resulting limitations are described. Potential uses are also demonstrated by application-oriented optical testing. Besides a standard spectrometer, additional spectrometer setups were used. These include a diffuse as well as a collimated illumination and different sample positioning. Furthermore, the scattered light intensity was measured at different angles. This analysis reveals that composites with smaller particles transmit more light directly. In contrast, standard spectrometers indicate an increasing direct transmittance of composites with larger particles. They collect significant amounts of scattered light and, therefore, are not suitable for transmission measurements of such composites. The different positioning shows that all specimens exhibit very little scattering when placed directly on a diffuse light source. With a greater distance between specimen and light source, the scattering increases strongly. To display the composites' optical appearance, the lightdark-contrast of the diffuse white light source photographed behind the composite was analyzed. Both long and short distances between composite and light source lead to a precise image of the light source. Nevertheless, the white light source appears in the color of the wavelength with matching refractive indices at long distances.

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A Fiber Optic Temperature Sensor Based on the Combination of Two Materials With Different Thermo-Optic Coefficients

Cited by 12 publications

References 23 publications

Optical and Mechanical Properties of Highly Transparent Glass-Flake Composites

Optical and Mechanical Properties of Highly Transparent Glass-Flake Composites

The Mechanical and Optical Properties of Injection-moulded PMMA, Filled with Glass Particles of a Matching Refractive Index

Light scattering of glass-particle filled matrices with similar refractive index

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