Laser Flash Technique (LFA)

based on, e.g., ASTM E1461, DIN EN 821-2, DIN 30905, ISO 22007-4, ISO 18755

Principle of the LFA Method

The laser or light flash method is used for measurement of the thermal diffusivity of a variety of different materials. The front surface of a plane-parallel sample is heated by a light pulse and the resulting temperature rise at the sample’s rear face is recorded as a function of time. The higher the thermal diffusivity, the faster the temperature rise reaches the rear face. 

In a one-dimensional, the thermal diffusivity rise is calculated from this temperature rise as follows:

a = 0.1388 ⋅ d² /  t0.5 with
a – Thermal diffusivity in cm²/s
d – Thickness of the sample in cm
t0.5 – Time to half minimum in s

With all NETZSCH laser flash apparatuses (LFAs), the thermal diffusivity and specific heat capacity can be determined. This data is then used for calculation of the thermal conductivity.

Figure 1
Figure 2

NETZSCH LFA Systems

LFA 467 HyperFlash® – Light Flash Apparatus

The new LFA 467 HyperFlash® features a wide temperature range, very high efficiency (with its sample changer for 16 samples), extremely fast data acquisition rates and an intelligent lens system (ZoomOptics) between the sample and detector.

LFA 467 HT HyperFlash® – Light Flash Apparatus

The LFA 467 HT HyperFlash® allows for accurate thermal diffusivity and thermal conductivity measurements between RT and 1250°C with the smallest footprint on the market. The Ultra-fast sampling rate and extremely short pulse widths enable measurements of thin and highly conductive materials.

LFA 427 - Laser Flash Apparatus / Pyrometer version for up to 2800°C

Outstanding attributes of the LFA 427 are high precision and reproducibility, short measuring times, variable sample holders and precisely adjustable atmosphere conditions in the application range from -120°C to 2800°C. The LFA 427 is the most powerful LFA system for use in research & development.

LFA 457 MicroFlash® - Laser Flash Apparatus

The LFA 457 MicroFlash® is the most modern product for the determination of the two thermophysical properties, thermal diffusivity and conductivity, in the range from -125°C to 1100°C. Its compact, vacuum-tight construction, automatic sample changer and functional software guarantee the highest effectiveness for challenging materials testing.