Prism is an advanced hole-drilling system that dramatically improves the ability to make quick and accurate residual stress measurements.
As with conventional strain gauge hole-drilling systems, the instrument measures changes in the part surface caused by the hole drilling to determine the previously existing residual stress. However, this method avoids the often time-consuming use of strain gauges, and it also analyses a large area around the hole. Only minimal sample preparation is required.
The Prism system measures surface distortion optically using laser light that is diffusely reflected from the sample surface, in a technique known as electronic speckle pattern interferometry, or ESPI. The Prism software manages the measurement, collects the data and analyses the results and data quality.