Abstract
A Curvature sensing structure without dissipation energy senses curvature variation of a sample and comprises a first medium layer, a second medium layer and at least one spacer. The first medium layer is consisted of flexible transparent material and has a shape. The second medium layer is consisted of flexible transparent material, has a shape that corresponding to the shape of the first medium layer, is disposed under the first medium layer, and is thicker and harder than the first medium layer. At least one spacer is disposed between the first medium layer and the second medium layer and creates space between the first medium layer and the second medium layer. A curvature sensing method without dissipation is also disclosed.