Infrared thermal imager detects the temperature distribution in a specific area of the measured object by non-contact measurement, and displays different temperatures in different colors to form visible images. Through the image, we can quickly and intuitively understand the temperature distribution in the area, and we can easily find the high temperature./Low temperature point, easy for qualitative and quantitative analysis and measurement of the measured object, which can quickly and accurately detect defects such as cracks, cracks, holes, broken grids, welding defects, uneven efficiency of single chip, large reverse current and so on.