There are many common detection methods in the field of non-destructive testing. Industrial endoscope has the characteristics of directly observing the surface defects. All kinds of metal and non-metal objects can be detected, such as all kinds of food and drug tanks, oil and gas tanks, all kinds of pipe internal, boiler internal defects surface detection has very good results.

工业内窥镜检测时是怎样判定物体内部缺陷的呢？

How to determine the internal defects of objects in the detection of industrial endoscope?

(1)裂纹。当光束照射被检测物表面，观察到黑色或者亮色线条，且在一定的放大倍数下，线条有不规则边缘时，判定为裂纹。当裂纹较宽时，可测量探头的测量影响线会发生弯折。

(1) Cracks. When the light beam irradiates the surface of the tested object, black or bright lines are observed, and under a certain magnification, the lines have irregular edges, it is judged as cracks. When the crack is wide, the influence line of the measurable probe will bend.
                

(2)起皮。当光束平行照射时，观察到在凸起部分背后有阴影；改变光束照射角度，则观察到表面凸起部分与周围被检测物有明显分界线，判定为起皮。

(2) Peeling. When the beam is irradiated in parallel, the shadow behind the convex part is observed; when the beam irradiation angle is changed, the obvious boundary between the convex part on the surface and the surrounding object is observed, which is judged as peeling.

(3)拉线和划痕。在光束照射下，观察到表面存在较规则的连续长线，判定为拉线。

(3) Stay wires and scratches. Under the irradiation of light beam, regular continuous long lines were observed on the surface, which was judged as stay wire.

(4)凹坑凸起。光束以一定角度照射时，与周围被检物边界连接，无分界线。离光源近的部分有阴影，离光源远的地方有亮影，为凹坑。光束以一定角度照射时，与周围被检物边界连接，无分界线。凸起部分有亮影，且背后阴影为凹坑。当凹坑较深或凸起较高时，可测量探头的测量线会发生弯折。

(4) The pit is convex. When the light beam irradiates at a certain angle, it is connected with the boundary of the surrounding objects, and there is no dividing line. The part near the light source has shadow, and the part far away from the light source has bright shadow, which is pit. When the light beam irradiates at a certain angle, it is connected with the boundary of the surrounding objects, and there is no dividing line. The convex part has light shadow, and the shadow behind is pit. When the pit is deep or the bulge is high, the measuring line of the measurable probe will be bent.

(5)斑点。在光束照射时，观察到与周围被检物色泽不同的光滑无凹凸表面为斑点。

(5) Spots. When the light beam irradiates, it is observed that the smooth and non concave convex surface with different color from the surrounding objects is spot.