Method for inspecting aging state of silicone rubber composite insulating material

A method for inspecting an aging state of a silicone rubber composite insulating material, comprising the following steps:

• S1:
• bombarding, for multiple times and by a pulsed laser beam, selected points on a surface of a silicone rubber composite insulating material to be inspected to generate a plasma, and measuring a bombardment depth formed in the silicone rubber composite insulating material after each bombardment;
• S2:
• collecting spectrum information emitted by the plasma at each bombardment, and extracting, from the collected spectrum information, a spectral property indicator of a specific constituent element of the silicone rubber composite insulating material at each bombardment, wherein the spectral property indicator comprises at least a spectral-line intensity characteristic of a characteristic spectral line;
• S3:
• determining a change pattern of the spectral property indicator of the specific constituent element with respect to the bombardment depth;
• and
• S4:
• determining changes of chemical compositions of the silicon rubber composite insulating material in along a depth direction of the silicon rubber composite insulating material in accordance with the change pattern, so as to obtain aging depth information of the silicone rubber composite insulating material,
• wherein in Step S1, the selected points on the surface of the silicone rubber composite insulating material to be inspected are bombarded for multiple times by a pulsed laser beam under the same bombardment conditions;
• in Step S3, a change pattern of the spectral property indicator of the specific constituent element with respect to the number of bombardments is determined, to reflect the change pattern of the spectral property indicator of the specific constituent element with respect to the bombardment depth;
• and in Step S4, the aging depth information of the silicone rubber composite insulating material is determined according to a linear relationship between the bombardment depth and the number of bombardments under the same bombardment conditions and the change pattern of the spectral property indicator of the specific constituent element with respect to the number of bombardments.