Crack detection method is safe in presence of liquid oxygen

Visual flaw detection method for metals utilizes color precipitate. This method can be used safely in the presence of liquid oxygen

Ultrasonic flaw detection

An ultrasonic microscope was designed and constructed to detect surface flaw defects on materials which contain natural discontinuities. The application of this flaw detection system to via-fill defects of single layer multiple layer ceramic substrates was considered. The microscope was evaluated for its depth sensitivity and resolution capabilities. The results of the experiment are that the ultrasonic system has repeatable depth sensitivities of better than ten microns, and resolution capabilities on the order of 3.3 cycles per millimeter. The application of the flaw detector to ceramic substrate via-fill defect inspection was verified

Holographic and ultrasonic detection of bond flaws in aluminum panels reinforced with boron-epoxy

An experimental investigation was made of the application of holographic interferometry to the nondestructive detection of unbonded areas (flaws) in bonded panels. Flaw detection results were compared with results obtained with an ultrasonic flaw detector. Holography, with panel deformation accomplished by a reduction in ambient pressure, is less sensitive for flaws beneath 5 and 10 plies of boron-epoxy than the ultrasonic method, though it does have its operational advantages. A process for the manufacture of bonded panels which incorporate known unbonded areas was also developed. The unbonded areas were formed without the use of foreign materials, which makes the method suitable for the construction of reference standards for bonded panels whenever needed for the proper setup of ultrasonic flaw-detection instruments

Система вихрострумової дефектоскопії

The eddy current nondestructive testing of metal products is widely used in various industries. There are eddy current control techniques takes a significant place in energy sector. Current work presents the eddy current flaw detection system. Implementation of this eddy current flaw detection system will solve a wide range of problems of eddy current flaw

NDE detectability of fatigue type cracks in high strength alloys

Specimens suitable for investigating the reliability of production nondestructive evaluation (NDE) to detect tightly closed fatigue cracks in high strength alloys representative of those materials used in spacecraft engine/booster construction were produced. Inconel 718 was selected as representative of nickel base alloys and Haynes 188 was selected as representative of cobalt base alloys used in this application. Cleaning procedures were developed to insure the reusability of the test specimens and a flaw detection reliability assessment of the fluorescent penetrant inspection method was performed using the test specimens produced to characterize their use for future reliability assessments and to provide additional NDE flaw detection reliability data for high strength alloys. The statistical analysis of the fluorescent penetrant inspection data was performed to determine the detection reliabilities for each inspection at a 90% probability/95% confidence level

DEDICATED MULTIPROCESSOR SYSTEM FOR AUTOMATIC RAIL FLAW DETECTION

An automatized ultrasonic rail flaw detection system has been developed for real-time rail flaw detection and evaluation. The whole system installed on a testing vehicle, working under rough environmental conditions must determine the internal irregularities of the rail, document them on the basis of a table containing the danger information, and immediately mark the rail in order to make easy the identification of the faulty segments for maintenance staff. During the measurement, three pairs of ultrasonic transmitters and receivers, with different orientation, scan the rail providing indirect information about the vertical section. The rail flaw detection procedure itself is a twodimensional pattern recognition problem consisting of image reconstruction, spatial filtering with thresholding and classifying phases

An MS Windows prototype for automatic general purpose image-based flaw detection

Flaw detection plays a crucial role in many industries to make sure that the products meet the specified quality requirements. When making for example a car it is important that all the parts satisfy certain quality standards to make sure the consumer buys a car that is safe to operate. A crack or another weakness in a crucial part can be catastrophic. To make sure their cars are as safe as possible, car manufacturers are conducting thorough testing of crucial parts. Similar tests are done in a wide variety of industries, and these quality controls are often referred to as flaw detection. Any cracks, voids, or other weaknesses that can cause danger are called flaws. Flaw detection is often done, or preferred done, in real time-- in an assembly line fashion. An important constraint, in addition to reliability, is therefore speed. The techniques used in these tests varies. Common techn~ques are ultrasonic waves (1-D or 2-D), eddy current imaging, x-ray imaging, thermal imaging, and fluorescent penetrent imaging. In this thesis I will discuss automatic general purpose image-based flaw detection. Automatic means that the flaw detection is performed without human supervision, and general purpose means that the inspection is not tailored to a specific task (i.e. one particular flaw in one particular type of object), but is ideally applicable to any detection problem

Pulsed eddy current non-destructive testing

The article is devoted to the development of an experimental model of the information-diagnostic system of eddy current flaw detection and analysis of its work. A technique for processing experimental data and presenting the results obtained is considered. It is shown that the use of eddy current flaw detection with transducer pulsed excitation mode in combination with digital processing of information signals based on the discrete Hilbert transform can substantially supplement the known eddy current method of NDT by analyzing such signal parameters as the frequency of natural oscillations, peak amplitude value, signal decrement. The proposed technique for processing the signals of an eddy current transducer has been tested using the example of processing the eddy current flaw detection signals in problems of testing an aluminum plate with cracks of different depths