How to check the lining of उच्च तापमान बॉक्स मफल भट्टी?

The gravity wave signal is highly sensitive to structural defects, and the lining of the sigma box muffle furnace can be inspected. When the gravity wave propagates in the medium, it encounters holes, cracks and other interfaces, discontinuities. Reflection, refraction, scattering and mode conversion will occur, so that it can be determined whether there are cracks or voids in the lining of the box muffle furnace.