Basic knowledge of ultrasonic non-destructive testing

Date：2023-06-21 15:10:12Views：244

Ultrasonic non-destructive testing is a non-destructive testing technology based on ultrasound, which can be used to detect anomalies or defects in materials, structures, or devices. It detects problems by utilizing the propagation speed, attenuation, and reflection of ultrasound in materials. This article will introduce the basic knowledge of ultrasonic non-destructive testing.

Propagation of ultrasonic waves

Ultrasound is a high-frequency sound wave with a frequency greater than 20kHz. It can propagate in air or medium, and when it encounters the surface of the material, some of the energy will be reflected back, while others will penetrate the material and enter its interior. When ultrasonic waves encounter changes in acoustic impedance or defects within the material, the corresponding waves will be captured by sensors that detect specific positions on the surface.

Principles of Ultrasonic Non destructive Testing

Ultrasonic non-destructive testing utilizes the characteristics of sound wave propagation and reflection, and the detector will move along the surface and record the echo time and intensity of the waves. These signals are transmitted back to the detection equipment and processed before being displayed or analyzed. The entire process did not damage the test object, so it is called non-destructive testing technology.

Application fields of ultrasonic non-destructive testing

Ultrasonic non-destructive testing is widely used in various industrial fields, including aviation, automobiles, ships, electronics, steel, transportation, etc. It can detect internal defects, cracks, pores, and other issues in materials, which is of great significance for ensuring product quality and people's safety. In the field of electronic product testing, ultrasonic non-destructive testing can be used in semiconductor chips, cables, electronic components, and PCB boards.

Instruments for ultrasonic non-destructive testing

Ultrasonic non-destructive testing requires specialized probes and instruments, which are usually composed of probes, transmitters, receivers, amplifiers, analog processing units, and digital processing units. The probe transmits ultrasonic waves into the detected object, and the transmitter sends an electrical signal to the probe and drives the probe to emit ultrasonic waves. The receiver receives the returned echo, the amplifier amplifies the signal, the analog processing unit processes the signal, and the digital processing unit converts the signal into a digital signal.

After reading this article, have you gained more understanding of ultrasonic non-destructive testing? That's all for today's content. If you find the content helpful, please follow Chuangxin Testing. We will provide you with more industry information. Understanding the basic knowledge of ultrasonic non-destructive testing can help us better understand its principles and applications, and promote its development and application in various industries.