 Nondestructive testing or nondestructive testing at DT is a wide group of analysis techniques used in science and technology industry to evaluate the properties of a material, component or system without causing damage. The terms nondestructive examination and DT nondestructive inspection and DT nondestructive evaluation and DT are also commonly used to describe this technology. Because NDT does not permanently alter the article being inspected, it is a highly valuable technique that can save both money and time in product evaluation, troubleshooting, and research. The six most frequently used NDT methods are eddy current, magnetic particle, liquid penetrant, radiographic, ultrasonic, and visual testing. NDT is commonly used in forensic engineering, mechanical engineering, petroleum engineering, electrical engineering, civil engineering, systems engineering, aeronautical engineering, medicine, and art. Innovations in the field of nondestructive testing have had a profound impact on medical imaging, including on echocardiography, medical ultrasonography, and digital radiography. With the advent of machine learning, computer vision and data-driven techniques, nondestructive testing have been improved in different fields. Applied data-driven and machine learning techniques to predict damaged state-based solely on visual observations in infrastructures? Various national and international trade associations exist to promote the industry's knowledge about nondestructive testing, and to develop standard methods and training. These include the American Society for Nondestructive Testing, the Nondestructive Testing Management Association, the International Committee for Nondestructive Testing, the European Federation for Nondestructive Testing and the British Institute of Nondestructive Testing. Integrity methods rely upon use of electromagnetic radiation, sound and other signal conversions to examine a wide variety of articles – metallic and non-metallic, food product, artifacts and antiquities, infrastructure for integrity, composition, or condition with no alteration of the article undergoing examination. Structural inspection DD the most commonly applied hand DD method, is quite often enhanced by the use of magnification, horoscopes, cameras, or other optical arrangements for direct or remote viewing. The internal structure of a sample can be examined for a volumetric inspection with penetrating radiation brews such as X-rays, neutrons or gamma radiation. Thread waves are utilized in the case of ultrasonic testing. Beauty another volumetric and DD method, the mechanical signal sound being reflected by conditions in the test particle and evaluated for amplitude and distance from the search unit transducer. Another commonly used and DD method used on Therous materials involves the application of fine iron particles either suspended in liquid-dewore dry powder, fluorescent or colored that are applied to a part while it is magnetized, either continually or residual. The particles will be attracted to leakage fields of magnetism on or in the test object, and form indications particle collection on the object's surface, which are evaluated visually. Contrast and probability of detection for a visual examination by the unaided eye is often enhanced by using liquids to penetrate the test particle surface, allowing for visualization of flaws or other surface conditions. This method liquid-penetrant testing platinum involves using dyes, fluorescent or colored typically red suspended in fluids and is used for non-magnetic materials, usually metals. Testing and documenting the non-destructive failure mode can also be accomplished using a high-speed camera recording continuously movie loop until the failure is detected. Detecting the failure can be accomplished using the sound detector or stress gauge which produces a signal to trigger the high-speed camera. These high-speed cameras have advanced recording modes to capture some non-destructive failures .5 after the failure the high-speed camera will stop recording. The capture images can be played back in slow motion showing precisely what happened before, during and after the non-destructive event, image by image.