FAQ

　　Non-destructive testing refers to the use of physical or chemical methods to detect changes in reactions such as heat, sound, light, electricity, and magnetism caused by abnormalities or defects in the internal structure of materials, without damaging or affecting the performance of the object being tested, and without harming the internal organization of the object being tested.Using modern technology and equipment, it is a method to inspect and test the internal and surface structure, properties, state, and types, properties, quantities, shapes, locations, sizes, distributions, and changes of defects in the test piece.

　　Four types: Radiographic Testing (RT), Ultrasonic Testing (UT), Magnetic Particle Testing (MT), and Liquid Penetrant Testing (PT). Other non-destructive testing methods include Eddy Current Testing (ECT), Acoustic Emission Testing (AE), Thermal Imaging/Infrared (TIR), Leak Testing (LT), Alternating Current Field Measurement Technique (ACFMT), Magnetic Flux Leakage Testing (MFL), Remote Field Testing (RFT), Time of Flight Diffraction (TOFD), and Visual Testing (VT), etc.

　　Non-destructive testing and its technologies play an important role in controlling and improving product quality, ensuring the reliability of materials, parts, and products, guaranteeing the safe operation of equipment, as well as enhancing production efficiency and reducing costs. It is an essential technical means for the development of modern industry and science and technology, and also an important link in comprehensive "quality management." Non-destructive testing plays an active role in all stages, from product design, processing and manufacturing, finished product inspection to in-service testing.

　　The ultrasonic thickness gauge measures thickness based on the principle of ultrasonic pulse reflection. When the ultrasonic pulse emitted by the probe passes through the object being measured and reaches the material interface, the pulse is reflected back to the probe. The thickness of the material being measured is determined by accurately measuring the time it takes for the ultrasonic wave to propagate through the material. Any material that allows ultrasonic waves to propagate at a constant speed can be measured using this principle.

　　Before purchasing a thickness gauge, everyone should first understand the types of thickness gauges available on the market to improve efficiency and meet their actual product needs. The main types of non-destructive testing thickness gauges are:
　　1. Magnetic thickness gauge: Suitable for measuring the thickness of non-magnetic layers on magnetic materials, which generally include: steel, iron, copper, etc.
　　2. Eddy current thickness gauge: Suitable for measuring the thickness of non-conductive layers on conductive metals.
　　3. Ultrasonic thickness gauge: This is based on the principle of ultrasonic pulse reflection for thickness measurement. Any material that allows ultrasonic waves to propagate at a constant speed within it can use this principle for measurement.

　　The principles of the two instruments are different, and the difference in measurement lies in the different detection objects. Taking the ultrasonic thickness gauge UM-2D from Shenyang Yushi Pioneer as an example, when measuring a steel plate with a paint layer, the UM-2D thickness gauge will penetrate the paint layer to measure the thickness of the steel plate, while the coating thickness gauge will measure the thickness of the paint on the steel plate.

　　The digital black and white transmission densitometer is an instrument used to measure the amount of light transmitted through the tested sample (such as X-ray films) to determine the amount of light absorbed by the surface. The black and white densitometer is an essential auxiliary tool for radiographic testing.

　　The black and white densitometer DM3011 developed and produced by Shenyang Yushi Pioneer comes with a calibration function, allowing users to calibrate the instrument using calibration software to match density plates of different standards.

　　Auxiliary tool for evaluating radiographic films. It provides sufficient brightness and relatively even backlighting, making it easier to see details when viewing the films compared to natural light or other lighting.

　　Acoustic impedance (Z) is a physical property of tissue. It describes the resistance encountered by an ultrasound beam as it passes through tissue, and its value is the product of the density and speed of sound waves in the medium.