Figure 1
Basic Principles of Operation:
| A thin
(~0.1 mm to 3
mm) disk shaped material sample is irradiated uniformly on one face with a laser
pulse (refer to figure 1). The temperature rise of the opposite face is
recorded as a function of time by an infrared detector. This temperature
rise gives a direct value for the diffusivity (D). Corrections are
made for the heat loss and the finite width of the laser pulse via integrated
software. Specific heat (Cp) is measured by comparing the
temperature rise of the test material with that of a material of known specific
heat. Thermal Conductivity (k) is then calculated using the formula
k = DpCP where p is the material density. |
Figure 1 |