Thermal diffusivity measurement in thin metallic filaments using the mirage method with multiple probe beams and a...

Area of Science:

• Materials Science
• Thermal Physics
• Optical Techniques

Background:

• Photothermal beam deflection is a standard method for thermal diffusivity measurement.
• It relies on laser-induced temperature variations and probe beam deflection.
• Traditional methods can be time-consuming due to sequential measurements.

Purpose of the Study:

• To develop a simplified and accelerated photothermal beam deflection technique.
• To replace conventional detection hardware with a digital camera system.
• To improve the efficiency of thermal diffusivity measurements.

Main Methods:

• Utilized a pump laser to induce thermal waves on sample surfaces.
• Employed a digital camera for non-contact detection of probe beam deflection.
• Implemented motion detection and digital signal processing for data analysis.
• Demonstrated the method on thin metallic filaments.

Main Results:

• Successfully measured thermal diffusivity using the novel camera-based detection scheme.
• The new method significantly reduces measurement time compared to traditional approaches.
• The experimental setup is simplified, requiring less specialized hardware.

Conclusions:

• The digital camera-based photothermal beam deflection technique offers a faster and simpler alternative for thermal diffusivity measurements.
• This approach is particularly effective for thin film and filamentary samples.
• It paves the way for more efficient material characterization.