Pollak, H. 0. and Davis, P., A Theorem for Kernel Functions, Proc. Amer. Math. Soc. 2 (5), pp. 686-690, October 1951. Pollais, H. 0. and Davis, P., On an Equivalent ...

Optical strain gauge types include photoelastic, moiré interferometry, and holographic interferometry strain gauges. In a fiber optic strain gauge the sensor measures the strain by shifting the light ...

These particles are photoelastic, Juanes explains, which means that when under stress, they modify any light passing through them according to the amount of stress. "So, if you shine polarized light ...