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Multiple shots averaging in laser flash measurement.
Applied Optics
|June 17, 2020
Summary
This study introduces a new laser flash system that repeatedly measures thermal diffusivity. Averaging multiple laser impulses improves signal-to-noise ratio for challenging material measurements.
Area of Science:
- Materials Science
- Thermal Analysis
- Heat Transfer
Background:
- The laser flash method is standard for determining thermal diffusivity.
- Low signal-to-noise ratios hinder measurements with limited power, high thermal capacity, or thick samples.
Purpose of the Study:
- To develop an improved laser flash control and data acquisition system.
- To enhance measurement accuracy in challenging conditions by reducing noise.
Main Methods:
- A novel laser flash system capable of repeated laser impulse emission.
- Acquisition of multiple thermal response measurements from specimens.
- Averaging technique applied to multiple datasets to reduce noise.
Main Results:
- The proposed system successfully reduces noise by averaging multiple measurements.
- Improved signal-to-noise ratio achieved, especially with low input power.
Conclusions:
- The new laser flash system enhances the reliability of thermal diffusivity measurements.
- This method is particularly beneficial for materials and sample types that challenge traditional laser flash analysis.
