Measurement of thermal diffusivity using a pyroelectric detector
01 Jun 1982-Journal of Applied Physics (American Institute of Physics)-Vol. 53, Iss: 6, pp 3947-3949
TL;DR: In this paper, a method of measuring the thermal diffusivity of thin layers has been developed and applied to the characterization of laminated structures using pyroelectric detection of a laser generated thermal pulse propagating through the sample.
Abstract: A new method of measuring the thermal diffusivity of thin layers has been developed and applied to the characterization of laminated structures. The thermal diffusivity is measured using pyroelectric detection of a laser generated thermal pulse propagating through the sample. The shape of this pulse is governed by the thermal properties of both the sample and the detector. However, the thermal diffusivity of the sample can be determined from the position of the peak in the pyroelectric signal and the sample thickness. This method can be applied to thermal diffusivity measurements of thin or thick films, laminates, and thermal greases.
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TL;DR: In this paper, the mechanism of pulsed laser ablation of a polymer at the wavelengths of 193, 248, and 308 nm was investigated and the results were mutually consistent and provide insight into the ablation mechanism.
Abstract: Calorimetric and acoustic studies of the mechanism of pulsed laser ablation of a polymer at the wavelengths of 193, 248, and 308 nm are reported. The results are mutually consistent and provide insight into the ablation mechanism.
124 citations
TL;DR: The use of pyroelectric sensors for the detection of radiation induced thermal wave phenomena (the photopyroelectric effect) is reviewed in this paper, where the use of these devices as detectors of radiation-induced heating is discussed in the time-resolved, and frequency-domain modes of excitation and detection and in a variety of spectral regions.
Abstract: The use of pyroelectric sensors for the detection of radiation induced thermal wave phenomena (the photopyroelectric effect) is reviewed. These sensors are compatible with most media—UHV, air, most liquids and solids—and have the potential for picosecond time resolution combined with a tremendous sensitivity. At first the signal generation process in such a sensor is briefly described and the importance of the ferroelectric material properties highlighted. The use of these devices as detectors of radiation-induced heating is then discussed in the time-resolved, and frequency-domain modes of excitation and detection and in a variety of spectral regions from radio waves to X-rays, electrons, ions and neutral particles. Condensed phase applications emphasizing the versatility and the unique properties of these detection schemes, as well as their inherent limitations will be presented. Typical applications in the thermal analysis and spectroscopy of thin films and the non-destructive evaluation of el...
47 citations
IBM1
TL;DR: In this paper, the use of pyroelectric polyvinylidene fluoride calorimeters for the measurement of thermal diffusivities of thin films is described, and the potential of this detection scheme combined with photothermal excitation is demonstrated on polymer films with thickness in the 1 μm range.
Abstract: The use of pyroelectric polyvinylidene fluoride calorimeters for the measurement of thermal diffusivities of thin films is described. The potential of this detection scheme combined with photothermal excitation is demonstrated on polymer films with thickness in the 1 μm range.
45 citations
TL;DR: In this article, the inverse photopyroelectric (IPPE) configuration was used in order to detect antiferromagnetic-paramagnetic phase transition in Cr2O3.
Abstract: The inverse photopyroelectric (IPPE) configuration was used in order to detect ther antiferromagnetic-paramagnetic phase transition in Cr2O3. It was demonstrated both theoretically and experimentally that the IPPE scheme is able to detect phase transitions in the case when the pyroelectric sensor is thermally thin and optically opaque. The main advantage of this configuration, compared with the standard one, is the elimination of all the possible detection problems connected with the optical properties of the sample (transparency, thermal reflectance, etc.). For a thermally thin sample the amplitude of the IPPE signal depends only on the specimen specific heat, allowing its direct calculation. A similar direct calculation of the sample effusivity is possible sometimes in the thermally-thick limit.
40 citations
TL;DR: In this paper, a time-delay theoretical model of thin-film pyroelectric detection is presented, which enables the recovery of thermal diffusivity and thermal conductivity information from the impulse response of the pyro electric system.
Abstract: Thin‐film pyroelectric effect detectors provide a simple means of measuring thermal properties of solid samples. The present work reports a time‐delay theoretical model of thin‐film pyroelectric detection which enables the recovery of thermal diffusivity and thermal conductivity information from the impulse response of the pyroelectric system.
38 citations
References
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31 Dec 1959
TL;DR: In this paper, a classic account describes the known exact solutions of problems of heat flow, with detailed discussion of all the most important boundary value problems, including boundary value maximization.
Abstract: This classic account describes the known exact solutions of problems of heat flow, with detailed discussion of all the most important boundary value problems.
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TL;DR: In this paper, the theory of ferroelectricity in terms of soft modes and lattice dynamics is developed and modern techniques of measurement, including X-ray, optic, and neutron scattering, infra-red absorption, and magnetic resonance.
Abstract: The book develops the modern theory of ferroelectricity in terms of soft modes and lattice dynamics and also describes modern techniques of measurement, including X-ray, optic, and neutron scattering, infra-red absorption, and magnetic resonance. It includes a discussion of the related phenomena of antiferroelectricity, pyroelectricity, and ferroelasticity and seconds on domains, thin films, ceramics, and polymers, leading on to a comprehensive survey of potential and actual device capabilities for pyroelectric detection, memories, display, and modulation. It should provide an authoritative account for those engaged in research or graduate ferroelectric or pyroelectric devices.
4,931 citations
TL;DR: In this paper, the dielectric constants, electrical conductivity, specific heat, and pyroelectric coefficients of ferroelectric Sr1−xBaxNb2O6 (SBN) were investigated as a function of temperature in the range 10°-500°K, and as a result of the Sr/Ba composition of the material.
Abstract: The dielectric constants, electrical conductivity, specific heat, and pyroelectric coefficients of ferro‐electric Sr1−xBaxNb2O6 (SBN) are investigated as a function of temperature in the range 10°–500°K, and as a function of the Sr/Ba composition of the material. A simple technique for measuring absolute pyroelectric coefficients and spontaneous polarizations of ferroelectrics is described. The electric field and frequency dependence of the dielectric properties are also investigated. The theory of pyroelectric detection is discussed from a materials point of view, and the experimental data are considered in terms of the usefulness of SBN as a pyroelectric detector of electromagnetic radiation.
702 citations
01 Aug 1967
TL;DR: In this article, the FORTRAN subroutine computes enthalphy and entropy of sodium in given state, and composition, molecular weight, volume, and compressibility factor of corresponding vapor.
Abstract: Assessment is given of physical and thermodynamic properties of sodium. FORTRAN subroutine computes enthalphy and entropy of sodium in given state, and composition, molecular weight, volume, and compressibility factor of corresponding vapor. Tabular results for saturated liquid and vapor are presented for a 500-2500 degree F range.
289 citations