Nondestructive testing of electronic components: Industrial CT and X-ray testing

Date：2021-08-11 17:37:53Views：1483

In the field of nondestructive testing, industrial CT testing and X-ray testing both use X-rays to detect the interior of objects. Industrial CT is industrial computed tomography imaging. It can clearly, accurately and intuitively display the internal structure, composition, material and defect of the detected object in the form of two-dimensional sectional image or three-dimensional image without damage to the detected object. The working principle of X-ray imaging detector mainly uses the penetration of X-ray. The wavelength of X-ray is very short and the energy is very large. When it shines on the material, the material can only absorb a small part, and most of the energy of X-ray will pass through the gap of material atoms, showing a very strong penetration ability. With regard to the absorption of X-ray rays, different images occur, so different black-and-white images can occur to complete the intention of nondestructive testing.

Industrial CT testing is developing rapidly. We believe that there are two main advantages of industrial CT testing:Non destructive and visualization。

Undamaged: it is a technology that uses ray principle technology and instruments to detect defects, chemical and physical parameters of materials, parts and equipment without damaging or affecting the service performance of the tested object (there is no damage to the object before and after the detection).

visualization: it is the theory, method and technology of using computer graphics and image processing technology to convert data into graphics or images, display them on the screen, and carry out interactive processing. It involves many fields such as computer graphics, image processing, computer vision and computer-aided design. It has become a comprehensive technology to study a series of problems such as data representation, data processing and decision analysis.

Outstanding advantages of industrial CT detection:

1. There is no information superposition, and the defect can be accurately determined and measured;

2. The density resolution is high, and the image can reach 0.1% or even higher;

3. The dynamic range of detection signal can reach more than 106;

4. Digital images are convenient for storage, transmission, analysis and processing.

Other advantages of industrial CT testing:

1. High energy of ray source: for industrial CT system, constant potential X-ray tube is commonly used, that is, the output power is constant, and the tube voltage is generally above 100kV, which can penetrate products with large thickness, and the maximum energy can reach 60MeV;

2. The mechanical structure is relatively simple: the ray source and detector remain stationary, and the detected workpiece is scanned;

3. Diversified structure and strong specificity: because industrial products vary in shape, composition, size, i.e. weight, different detection requirements, industrial CT is diverse and targeted.

Application of industrial CT detection

1. Defect analysis: quickly, accurately and intuitively find the internal defects of the product (defect type, orientation, scale, etc.), such as cracks, pores, porosity, inclusions and other defects, analyze them, find the root causes of the defects, and then improve the product performance and extend the service life of the product.

2. Installation analysis: using industrial CT can intuitively understand the two-dimensional and three-dimensional partial whole, perspective or cross-sectional analysis of the product without disassembly, analyze and measure the gap formed by the installation between components, evaluate the process, find the failure causes, deal with relevant problems, and reduce the investment cost of R & D.

3. Scale measurement: the practical scale of products is often indispensable, but it can not be obtained due to the clutter of object surface or the constraints of objective physical conditions. Industrial CT skills can well deal with such problems. Different from the traditional measurement methods such as three coordinate detection and imager, the advantage of industrial CT scale measurement lies in the internal scale detection of products. It can accurately measure all dimensions of the workpiece without damaging the sample, with high precision and high speed.

4. CAD digital analog comparison: through industrial CT and analysis software, the scanning results can be best fitted with CAD digital analog, and displayed quickly and vividly with intuitive color error. It can not only get the overall error of the workpiece, but also get the detailed error value of the key orientation.

5. Wall thickness analysis: automatically locate the orientation of insufficient area or excessive wall thickness and excessive gap directly on CT data, especially the internal scale of confined space, which can quickly and accurately measure the small changes of wall thickness of disordered parts.

to make a long story short,X-ray imaging testing is an excellent solution for industrial nondestructive testing.As a new X-ray true three-dimensional imaging technology, industrial CT obtains the true three-dimensional model of the object surface and interior at one time. It has the advantages of high imaging efficiency, high spatial resolution and isotropy. It provides an ideal data source for high-end equipment manufacturing and industrial nondestructive testing. Industrial CT shows its uniqueness in industry, especially in the field of nondestructive testing (NDT) and nondestructive evaluation (NDE).

Therefore, the international nondestructive testing community calls industrial CT testing the best nondestructive testing method. In the 21st century, CT has been further developed and has become an important advanced non-invasive detection technology. There is another obvious development direction of industrial CT, that is, at present, the main way to detect and identify the defects in industrial CT slice images is still to be judged by professionals. This recognition method mainly depends on the experience of inspectors. The detection results are often disturbed by the subjective judgment of inspectors, and the results are not objective enough. Improving the efficiency while ensuring the detection quality, AI intelligent recognition and resolution of sample information will become a development direction in the field of industrial CT detection, which is also the inevitable trend of the development of defect detection technology in the future.