LFA 457 MicroFlash® - product brochure
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LFA 457 MicroFlash® -  product brochure - 1

Laser Flash Apparatus LFA 457 MicroFlash® Thermal Diffusivity and Thermal Conductivity Method, Techniques and Applications Analyzing & Testing

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Thermal Conductivity/Thermal Diffusivity THE FLASH METHOD How much heat is being transferred, and how fast? The thermal characterization of highly conductive materials at cryogenic and moderate temperatures – or of ceramics and refractories at elevated temperatures – is of paramount interest in today’s milieu of analytical challenges. Many questions can only be answered when two fundamental thermal properties are precisely known: diffusivity and conductivity. One accurate, reliable and elegant solution to this is offered by the Laser Flash method, which allows for addressing questions...

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The Laser Flash (LFA) technique is a fast, non-destructive and non-contact method for determining thermal diffusivity and specific heat. The front surface of a plane-parallel sample is heated by a short energy light pulse. From the resulting temperature excursion of the rear face measured with an infrared (IR) detector, thermal diffusivity and, if a reference specimen is used, specific heat are both determined. Combining these thermophysical properties with the density value allows for calculation of the thermal conductivity as follows: where λ = thermal conductivity [W/(m·K)] a = thermal...

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LFA 457 MicroFlash® Advancements in Laser Flash Technology ent strum op in t lends t in ableThis t all footpr bility! xi sm with ndous fle e trem

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Temperature-Dependent Tests in a Broad Temperature Range Two user-interchangeable furnaces are available which are moved with a motorized hoist. The low-temperature furnace comes with a controlled liquid nitrogen cooling device and allows for measurements between -125°C and 500°C, while the aircooled high-temperature furnace allows for measurements between room temperature and 1100°C. TESTS heat Broadest Measurement Range The technique can be used for materials with thermal diffusivities between 0.01 mm2/s and 1000 mm2/s (thermal conductivities between 0.1 W/(m-K) and 2000 W/(m-K))....

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Optimum Laser Power in Combination with High-Sensitivity Detector System The laser system built into the instrument requires no external optical fiber delivery. Due to the small distance between the sample and detector, the laser power can be reduced to a minimum. For most applications, 5 to 8 J is sufficient (a temperature increase of only a few mK!). Thanks to the detector, the sample will not overheat during measurement and the risk of chipped sample coatings and sample damage is minimized. Laser - Defined Pulse Energy for Optimum Pulses The Nd:Glass has a maximum pulse energy of 18 J...

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Patented* Pulse Mapping for Finite Pulse Correction and Improved cp Determination Aperture stop Furnace Sample carrier Furnace hoist A very elaborate LFA – from design to execution The acquisition of the real laser pulse at each individual measurement is allowed. The mathematical description of the real laser pulse and consideration in all calculation models pave the way for investigations on thin foils and materials with the highest of conductivities. In addition, the real pulse energy is taken into consideration in the calculation of specific heat to improve accuracy. * Patent No.: US...

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ACCESSORIES Automatic Sample Changer Sample Carriers The integrated motorized sample changer allows measurement of up to three samples at the same time. The sample carriers are arranged on a robust sample carrier tube which rotates during sample change. For large sample sizes, the system can be equipped with a carrier plate for single-sample operation (up to Ø 25.4 mm). Various sample carriers for circular or square solid samples between 6 mm and 25.4 mm are available including sample carriers for special geometries, in-plane measurements and tests under pressure. Of course, we offer sample...

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Furnaces/Temperature range Measuring range Accuracy Repeatability Measurement atmospheres Automatic sample changer Specimen dimensions/ shapes* Reference materials Software Utilities Instrument dimensions LFA 457 MicroFlash® ■ -125°C to 500°C (helium atmosphere recommended) ■ RT to 1100°C ^ One instrument and two easily exchangeable furnaces and detectors ■ Nd:Glass Laser class 1 ■ Wavelength 1054 nm ■ Energy up to 18 J/pulse (variable, software-controlled) ■ Pulse width 0.3 ms ■ Patented pulse mapping (US7038209, DE10242741), for finite pulse correction ■ Automatic enlargement optics for...

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Software Proteus® Penetration (Eindringung) HEAT LOSS Intelligent Operation – Just a Click Away Heat Loss (Wärmeverlust) MODEL WIZARD Model Wizard Penetration (Eindringung) The Proteus® software runs on Windows® XP Professional or on Windows® 7 32-/64-bit Professional, Enterprise or Ultimate operating systems. Userfriendly menus combined with automated routines make this software very easy to use while still providing sophisticated analysis. The Proteus® software is licensed with the instrument and can, of course, be installed on other computer systems. PENETRATION Radiation (Interne...

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Special Software Features Standard models including ■ Improved Cape-Lehman (considers multi-dimensional heat loss and non-linear regression) ■ Radiation for transparent and translucent specimens ■ Penetration All standard models allow for the combination of heat loss, pulse correction and various baseline types. All factors are freely selectable; R2-fit and residuals for calculating the Goodness of Fit. Adiabatic Cowan 2-/3-layer models (non-linear regression and consideration of heat loss) Accurate pulse length correction, patented pulse mapping (patent no.: US7038209B2; US20040079886;...

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Unrivaled Pulse Correction for Thin and Highly Conductive Materials Pulse mapping (patent no. US7038209, US20040079886, DE10242741) enables finite pulse correction, improved thermal diffusivity and cp determination. It considers acquisition of the real laser pulse at each individual measurement and the mathematical description of the real pulse by verifying all calculation models included in the software. awith pulse correction ■ without pulse correction ---Literature value Thickness: 1.015mm Half time: 0.8 ms The influence of pulse correction is demonstrated with measurements on a...

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