The Discovery Xenon Flash (DXF) source module employs a High Speed Xenon-pulse Delivery source (HSXD) which has considerably higher efficiency, lower costs and less maintenance than equivalent systems. A reflective optic configuration of our design effectively harnesses the power of a Xenon flash tube and, with the aid of proprietary wave guides, delivers it to the specimen inside the Environmental Module. DXF 900 produces a pulse width of 400 μs to 600 μs and uniformly concentrates the power from the flash source directly on the entire face of the specimen. Due to this optimized optical arrangement and the broad light spectrum, specimens as large as 25 mm in diameter can be illuminated with sufficient energy to make a high-accuracy measurement. The use of large samples diminishes errors associated with inhomogeneity and permits representative measurements of poorly dispersed composites.
DXF 900 covers the most common range of temperatures, from Room Temperature to 900°C. It is suitable for research and development programs as well as production control.
Employing nichrome heaters and an aluminum air-cooled shell, DXF 900 operates from Room Temperature up to 900°C in air or inert gas purge and is vacuum-tight to 10-2 torr. The Xenon-pulse induced temperature change is measured from the rear surface of the specimen using a liquid nitrogen-cooled IR detector. The four positions sample-holder accommodates a variety of specimen sizes in round or square shapes.
All Discovery Flash source modules employ full-time pulse mapping and recording capability. This allows for precise pulse-shape and pulse-width correction calculations and the most accurate determination of the t0.
The Discovery Flash data analysis software also employs the latest methods for heat loss corrections. The Clark and Taylor and Curve Fitting algorithms are utilized as the most accurate general purpose procedure to determine thermal diffusivity based on the finite pulse width, radiation heat losses, and non-isothermal local sample conditions. Additionally, more than 20 different analysis models and correction programs are incorporated into the software, providing the highest accuracy for all material types.
Discovery Flash instruments utilize high sensitivity, quick response sensors for the most accurate measurement of transient temperature changes. As an integral component of the environmental module, the detector is factory-aligned to the sample and does not require user exchange or alignment. The detector type is selected specifically for the operating temperature range of the Environmental Module. For moderate to high temperature measurements, an indium antimonide (InSb) IR detector is employed. The IR detector is cooled with liquid nitrogen to ensure the most stable output and maximum repeatability.
Standard and Universal
Standard and Universal
The flash method is widely accepted and is documented in ASTM E1461, ASTM E2585, DIN EN821, DIN 30905, ISO 22007-4:2008, and ISO 18755:2005. All TA Instruments Discovery Flash instruments conform to these standards and can be relied on to produce accurate, repeatable results that can be easily compared between laboratories.