液晶探伤法是近几年发展起来的一种新技术。它是以液晶作为温度敏感元件的热学无损探伤方法。由于它的简便,直观而受到人们的重视。目前已广泛应用于字航,电子学,医学,化学等方而。(一)液晶和液晶态:某些有机物质,在熔化过程中不是由晶体直接变成无定形液体,而是出现一种介乎晶体和无定形液体之间的中间状态。它具有普通液体的流动性、又有光学上的各向异性,这种中间状态 Liquid crystal flaw detection is a new technology developed in recent years. It is based on liquid crystal as a temperature-sensitive components of the thermal non-destructive testing methods. Because of its simplicity, intuitive and by people’s attention. Has been widely used in word navigation, electronics, medicine, chemistry and so on. (I) Liquid Crystal and Liquid Crystalline State: Some organic substances do not directly change from amorphous to amorphous in the melting process, but appear in an intermediate state between the crystalline and amorphous liquids. It has the liquidity of ordinary liquid, there are optical anisotropy, this intermediate state