Metrological evaluation of a flaw detector used in non-destructive testing by ultrasound (original) (raw)
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Advances in Electrical and Electronic Engineering, 2011
In the article an improved method of measurements synchronization which uses the cross correlation function and calibration patterns is presented. The previous version of the method turned out to be not precise enough if angle probes were used during the measurements. Complementing the existing procedures with additional resampling of the signal eliminated in practice the mentioned problems. The presented calibration strategy reduces the time of preparing multi-channel flow detector for the test, allows the correction of spatial placement of the probes and allows to improve the repeatability of the measurements. It also allows to use angle probes and it is suitable for different research methods (echo, shadow or tandem method).
Epj Web of Conferences, 2010
This work deals with the Liquid Resin Infusion (LRI) process developed within the research program ``FUSelage COMPosite'' of DAHER SOCATA. This manufacturing process enables the realization of complex composite structures or fuselage elements in a single phase (mono-material), which considerably reduce connections and relative difficulties. The concern here is the investigation of non destructive testing (NDT) methods that can be applied to LRI-structures in order to define their capacities for defect detection, and especially their associated critical defect size. In aviation industry, the AITM standards require the ultrasonic testing as NDT for composite materials. Therefore the aim of this work is to characterize and compare three different and complementary ultrasonic techniques on composite specimens. Such analysis allows to define the NDT application field of each method in term of defect detection.
Characterization and Comparison of Defects Detection Limits of Ultrasonic Non Destructive Techniques
Key Engineering Materials, 2012
This work deals with the Liquid Resin Infusion (LRI) process developed within the research program "FUSelage COMPosite" of DAHER SOCATA. This manufacturing process enables the realization of complex composite structures or fuselage elements in a single phase (mono-material), which considerably reduce connections and relative difficulties. The concern here is the investigation of non destructive testing (NDT) methods that can be applied to LRI-structures in order to define their capacities for defect detection, and especially their associated critical defect size. In aviation industry, the AITM standards require the ultrasonic testing as NDT for composite materials. Therefore the aim of this work is to characterize and compare three different and complementary ultrasonic techniques on composite specimens. Such analysis allows to define the NDT application field of each method in term of defect detection.
USING ULTRASONIC FLAW DETECTOR TO CHECK OUT.pdf
As part of the development of a new manual Non Destructive Testing (NDT) system combining complementary inspection techniques, an inspection system based on Ultrasonic Flaw Detector for detection of interference between inner raceway of bearing over the railway motor axle. This paper presents the initial study, which includes the UFD experimental setup and the initial results obtained after testing the system on railway inner raceway of bearing over the axle. The oscillating systems used for the production of ultrasound waves should be suitable for working with high frequencies. This means that all oscillating systems with spring and mass separated, which are used for the production of sound in the hearing range, cannot be used to produce ultrasound since we cannot increase their Eigen frequencies above a certain value. The propose work of this project, is to inspect and maintain the adequate interference between inner raceway of motor suspension bearing over the power axle by Ultrasonic Flaw Detector. The angular probe of 51 0 is to be use for inspect the interference, in this type of instrument diagonally and radials inspection are possible, the angle of probe is to be special design regarding to axle diameter and diagonal distance.
Ultrasonic visualization systems (UVS) for non-destructive testing, which operate in a real time mode, were investigated. Usually manufacturers declare, that such UVS are designed for diagnosis of subsurface defects in solids, composite materials etc. So, the measurement operation must be carried out by UVS in order to get quantitative information about defects size and spatial location. This information has to be presented for the user, who makes a decision about tested object's condition. However, acoustic images, obtained with UVS, do not present the information about defect's size and spatial location. In this case the diagnostic results (or resulting images) of the UVS, are not reliable enough for making a decision. The metrological evaluation of the UVS is required in order to get the impartial and quantitative estimation of the object's test results. Such evaluation is value-adding for the acoustic images obtained with UVS. In this work the tasks for the metrological evaluation of the UVS are presented. The characteristics for the metrological UVS evaluation are proposed. The instrumentalities for determination of these characteristics are proposed and investigated. The methodology for the metrological evaluation of the UVS is presented.
Ultrasonic image data processing for the detection of defects
Ultrasonics, 1994
Ultrasonic testing is widely used in material inspection. Forming an ultrasonic image helps the operator in decision making. This image, however, can result in common interpretation difficulties during the testing of heterogeneous or noisy zones. A new method of detection of defects located in a noisy medium is presented: it is based on considering the ultrasonic grey-level image from the beginning of the analysis. The data processing used here is searching for a certain determinism in the spatial and temporal evolution of the image in the presence of a defect: a first criterion studies the horizontal stability of the gradients in the image and a second considers the transient temporal nature of the defect echo. Results obtained on artificial defects located in real welds are shown. Conclusions with respect to the quality of this defect detection method are drawn.
Ultrasonic stress measurement using PC based and commercial flaw detectors
Review of Scientific Instruments, 2000
The determination of the stress field inside metallic parts is one of the most important challenges to the designer. Although the prediction of the stress distribution can be done by several numerical and empirical methods, the real stress value is almost always unknown. Several destructive and nondestructive techniques have been tested to accomplish this task, including the application of x rays, saw cut, neutron diffraction and so on, but none of them seems to have a suitable correlation between cost and applicability. Ultrasonic techniques have been used for flaw detection since the 1950s. The main application was in the identification of cracks and voids. In this work we present the application of ultrasound in the evaluation of a one-dimensional stress field using the longitudinal critically refracted waves (L CR). A new ultrasonic L CR probe is presented and its performance is evaluated using PC based instrumentation. Also, the L CR waves' sensitivity is verified using a low cost commercial flaw detector. The results show that the technique can be applied to quantify the magnitude of the stresses in bars, using either the PC based or the commercial flaw detector system, as long as the high sensitivity longitudinal critically refracted waves are used.
IOP Conference Series: Materials Science and Engineering, 2016
The paper considers the problems of ultrasonic nondestructive testing of products intended for mechanical engineering. The functional and electronic circuits of an ultrasonic tomograph are presented. The function of signal radiation from the clocked multielement apparatus is described, the cross-functional flowchart of the prototype of a US tomograph is considered. The development trends of ultrasonic tomography for near-term outlook are demonstrated.