The measurement method is a horizontal scanning method. Place the film blowing machine winding platform. By irradiating thin films with X-rays. Measure the total thickness of 2 layers. Calculate the angle through an encoder that rotates by pulling upwards. Through linear velocity and angle. Matrix calculation of single-layer thickness. Use comparative feedback method. Control the heating current of the heating rod inside the wind ring. Adjust the thickness deviation of the film. Sichuan Jinzhongde Science and Technology Research Institute