DLF 2800

High Power Laser and Advanced Optics 

The DLF 2800 features the industry’s most powerful and robust laser light source and most efficient delivery system. The proprietary Class 1 Neodymium-Phosphate Glass laser and fiber optic power wand system, with built-in alignment, ensure effective generation and delivery of laser energy to the sample.

• Proprietary laser designed and manufactured by TA
• 40% more light pulse energy delivered to the sample surface than the closest competitive system
• 99% homogenized laser energy profile ensures unmatched measurement accuracy
• Noise-free design – The separation of the laser and furnace modules eliminates the effect of electromagnetic interference, and ensures long-term optical alignment stability

Dual-Pyrometer Temperature Reading 

The DLF 2800 incorporates a proprietary dual-pyrometer design guaranteeing unrivaled high temperature precision and accuracy. This unique feature also enables uninterrupted sample testing from room temperature to 2800°C. Above 900°C, a two-color pyrometer provides a second temperature reading, eliminating the possibility of uncertainty due to changes in the emissivity of the sample, degradation of the optical windows, or the alignment conditions of optical paths.

2800°C Furnace

The DLF 2800 is configured with a graphite furnace with a maximum temperature of 2800°C. The intelligent design of the furnace sets it apart from competitive light flash analysis instruments in every aspect of temperature performance. The furnace employs high quality heating elements, a muffle tube, and multiple baffles along its length preventing thermal disturbances. The result is a furnace designed to provide the most stable and uniform heating for reliable control of the sample at 2800°C. When operating the DLF 2800, every sample in the carousel absolutely reaches and maintains the programmed temperature from ambient up to 2800°C throughout the testing time. Sample testing can be conducted in static or dynamic atmospheres, including vacuum or inert gas purge. The DLF 2800 provides the most reproducible thermal diffusivity measurements available from RT to 2800°C.

Precision IR Detector and Optics

The DLF 2800 includes a high sensitivity liquid nitrogen cooled Indium Antimonide (InSb) IR detector with an optimum signal-to-noise ratio over the entire temperature range. A built-in liquid nitrogen dewar provides unattended 24-hour operation for uninterrupted extended experiments. Additionally, the optics in the detector path ensure uniform and accurate measurement of the sample thermogram. The IR detection area covers more than 90% of the sample surface, and representative data is collected without contributions from extraneous radiation, including edge effects such as flash-through caused by imperfect sample preparation.

Flexible High Productivity Sample Carousel

The DLF 2800 is the only high temperature flash system on the market that comes standard with a carousel enabling simultaneous testing of up to six samples in a single experiment to 2800°C. This multi-sampling capability significantly increases throughput, and avoids unnecessary downtime between experiments. Additionally, it delivers the most accurate heat capacity (Cp) measurements; Measurements of heat capacity by the flash method rely on comparing a sample and reference tested under identical conditions. With the multi-sample carousel, the sample and reference can be measured sequentially under identical thermal and environmental conditions leading to faster and more accurate results.

The carousel accepts samples up to 12.7 mm diameter and 10 mm thick, 50% thicker than any competitive high-temperature light flash instrument. Optional trays and adapters can accommodate a variety of sample dimensions and shapes, including round and square. Specialty sample holders are available for liquids, powders, pastes, laminates, and in-plane testing of thin films.

Unmatched Accuracy and Repeatability

Accuracy, which defines how close a set of measured data are to the true value, is paramount in understanding how well an instrument performs under known conditions. The figure to the right shows results of a graphite sample tested to 2800°C compared to the reference value. The data shows the accuracy is better than ±3% across the entire temperature range.