Prism - Residual stress measurement based on hole-drilling and ESPI

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Prism residual stress is a measurement technology that dramatically improves the ability to make quick, accurate residual stress measurements. The technology utilizes stress-relaxation technique, where a small hole is drilled into the material thus relaxing the stress along the hole boundaries. The resulting surface distortion can then be measured precisely using electronic speckle pattern interferometry system (ESPI).

A standard Prism system comprises

a computer and monitor for acquiring and viewing images of the part,
a laser light source,
illumination and video heads and
a high-speed drill
a software package that processes the deformation data and visualizes the stress results.

The system software fully integrates the hardware to provide automated data capture, and analysis of the resulting images. The software allows different levels of automation, including performing drilling and data acquisition for a complete stress depth profile fully automatically. The instrument is easy to set up and easy to operate. The measurements are highly accurate and fast.

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