Shearography is a method used to test if something is broken on the inside, where people cannot see. Things that can be tested with shearography are airplane wings, wind turbine generator blades, boats, and other structures. A special camera is used to take a picture of something that might be broken inside. After this picture is taken, the structure is pushed a little bit so that it bends slightly. While it is bent, another photo is taken with the special camera in the same location. The special camera uses computer software to compare the two pictures. If the software sees any damage, it will display the damage on a computer monitor so people can see it.