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(Color online) Geometry of the experiment. An acoustic source produces a focused ultrasound burst, which propagates along the axis of an elastic specimen (z axis). A photoelastic image is formed with the use of a circular polariscope consisting of a polarizer, two quarter-wave plates, and an analyzer. A collimated optical beam from a pulsed light-emitting diode (LED) is projected onto the specimen along the x axis.
