A fiber optic temperature sensor based on the combination of epoxy and glass particles with different thermo-optic coefficients

Wildner, Wolfgang; Drummer, Dietmar

doi:10.1007/s13320-016-0328-6

Cited by 5 publications

(2 citation statements)

References 31 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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“…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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Dual Mach-Zehnder Interferometer Based on DCF and FCF for Temperature and Strain Measurement

Gao,

Jin,

Zuo

et al. 2024

Photonic Sens

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In this paper, a dual Mach-Zehnder interferometer for measuring both temperature and strain is proposed and verified by experiments. The sensor configuration involves cascading a four-core fiber and a double-clad fiber between two single-mode fibers. By exploiting the different responses of the two Mach-Zehnder interferometers to temperature and strain, we construct a matrix using two selected resonance dips from the transmission spectra, so that both temperature and strain can be measured simultaneously. The experimental results show the sensor’s remarkable performance, with the maximum temperature sensitivity of −94.2 pm/°C and the maximum strain sensitivity of 2.68 pm/µε. The maximum temperature error and strain error are found to be ±0.35 °C and ±4.8 µε, respectively. Compared with other optical fiber sensors, the sensor has high sensitivity, a simple structure, and ease to manufacture and implement, making it a structure choice for applications in quality inspection of materials.

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A fiber optic temperature sensor based on the combination of epoxy and glass particles with different thermo-optic coefficients

Cited by 5 publications

References 31 publications

Optical and Mechanical Properties of Highly Transparent Glass-Flake Composites

Optical and Mechanical Properties of Highly Transparent Glass-Flake Composites

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

Dual Mach-Zehnder Interferometer Based on DCF and FCF for Temperature and Strain Measurement

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