The thickness of the muffler head for traffic jam of steam turbine is relatively thin, and the main processing method is cold rolling plate or wire cutting. The traditional heat treatment material 2Cr12MoV is easy to be cut and deformed. At present, vacuum heat treatment can reduce deformation, but the cost is high, the plate can be processed, but there is no place to buy in China, so we need to find a solution. δC=Ct1-Ct0。 If the basic capacitance (no-load capacitance, connecting line capacitance, etc.) is large, but δ C is small, if the basic capacitance is stable, the above method can also measure δ C well. However, due to changes in the environment (temperature and humidity of the medium, static electricity, etc.). ）The basic capacitance (mainly connecting line capacitance and other distributed capacitance) varies greatly, and δ C is submerged by noise, so it is difficult to measure δ C by general methods. According to the interweaving of two mutually perpendicular yarn systems and the relatively uniform distribution of weft, the position of weft on the fabric image can be accurately determined, and the muffler and density of air cannon can be used to determine the position of weave points and identify the properties of weave points.