Abstract
A non-energy dissipating, curvature sensing device senses curvature variation of a sample and comprises an outer layer, an inner layer and at least one spacer. The outer layer is flexible, transparent material and has a shape. The inner layer is flexible, transparent material, has a shape corresponding to the shape of the outer layer, is positioned under the outer layer and is thicker and harder than the outer layer. At least one spacer is positioned between the outer layer and the inner layer and creates space between the outer layer and the inner layer. A non-energy dissipating, curvature sensing method is also disclosed.