Polyimide film has been the ideal flexible substrate for its physical and chemical performance.

聚酰亚胺薄膜由于其良好的物理化学性能，成为柔性衬底的理想材料。

The measuring grid is formed by etching Constantan foil, which is then completely sealed in a carrier medium composed of polyimide film.

测量网格是由康铜箔片构成的，然后完全密封于一个由聚酰亚胺薄膜组成的介质载体。

The results showe that the thermal expand coefficient of polyimide film is instability, it tends to stabilization after four times of psychro-thermal cycles.

结果表明：聚酰亚胺薄膜的热膨胀系数具有不稳定性，当经四次冷热循环后才趋于稳定。