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• W2404545412 abstract "Photothermal measurements based on modulated heating in the visible spectral range and IR detection of the thermal response are used to determine the effective thermal transport properties and the shielding properties of multi-layer superinsulation foils consisting of different numbers of aluminized mylar layers and spacer layers. The measurements have been run at ambient temperature, both at ambient pressure and at reduced pressures between 1 mbar and 300 mbar. 1. Introduction Owing to voids, an effective low mass density and a relatively low thermal conductivity, the internal radiative heat transport can play an important role in heat insulation materials. Apart from foam materials and ceramics such effects are also relevant in multi-layer super- insulation foils consisting of highly reflective aluminized mylar foils, used for thermal insu- lation of space shuttles and satellites in space-flight or of superconducting magnetic coils. In large scale applications of superconductivity in particle accelerators, e.g. in the Large Hadron Collider at CERN, the energy costs for cooling are relatively high and require optimization of the insulation system. This may be achieved by an appropriate number of insulation and spacer layers, by optimizing the thickness and homogeneity of the individual mylar layer, by optimizing the thickness and the reflection properties of the metal films, and by searching for a suitable material for metallization. Photothermal measurements based on modulated heating in the visible spectrum and IR detection of the thermal wave response are used here to determine the effective thermal transport properties, respectively the shielding properties of multi-layer superinsulation foils consisting of different numbers of aluminized mylar layers and spacer layers. The measure- ments have been run at ambient temperature, both at ambient and at reduced pressures. In chapter 2, the measurement method is briefly described. Subsequently the results obtained at ambient pressure for different numbers of aluminized mylar foils and spacer lay- ers of the superinsulation system Lydall Dam are presented (chapt. 3). The results obtained at reduced pressures (1 mbar - 300 mbar) for a constant number of aluminized mylar layers are presented in chapter 4. The measured data are interpreted in the frame of a photothermal theory, considering both conductive and radiative heat transport. 2. Infrared radiometry of thermal waves The photothermal measurements and their interpretation are based on the concept of transmitted thermal waves (1), where the sample's front surface is heated and where the thermal response is detected at the rear surface. This method is especially suited to measure the insulation properties of samples of finite thickness and of layer systems with different numbers of layers. The measuring system developed for the IR detection of thermal waves consists of four" @default.
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• W2404545412 date "2000-01-01" @default.
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• W2404545412 title "Modulated photothermal measurements applied to multi-layer superinsulation foils" @default.
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• W2404545412 doi "https://doi.org/10.21611/qirt.2000.042" @default.
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