Us7784348b2 articulated robot for laser ultrasonic. Two inspection problems and their solutions two specific examples of difficult inspection scenarios will now be detailed. Applications of laser ultrasound ndt methods on composite structures in aerospace industry. Development and applications of laserultrasonic testing. Development and applications of laserultrasonic testing in. Ultrasound is today one of the commonest nondestructive methods in industry, in particular for the inspection of composites in the aerospace industry. Please read the references for further information as it is a very broad and area which would be impossible to thoroughly cover here. Laser nondestructive testing ndt laser tea co2 laser. Laser induced focused ultrasound for nondestructive testing and evaluation victor v. Pdf bscan simulations with abaqus for laser ultrasonic. In conclusion, as far as the directivity or the frequency range of the ultrasonic waves are concerned, the laser generation appears well adapted to the testing of composite materials. The obvious advantage of using laser ultrasound is that it can be totally remote over relatively large distances. Riedersynthetic aperture focusing of ultrasonic inspection.
Line scans transverse to the weld was performed with the generation and detection superimposed directly on the surface of the weld bead. Aug 03, 2011 laser ultrasonic testing lut is a noncontact, nondestructive inspection technology that that uses lasers to generate and detect ultrasonic waves in the component under test. Develop a written procedure and provide initial training to inspection personnel. Laser ultrasonic techniques are used to examine the propagation of ultrasonic waves in concrete. Osa application of laser ultrasonic method for online. The results demonstrate laser ultrasonic testing lut as a promising method for the noncontact inspection. It has advantages for testing metals, composite materials, ceramics, and liquids. Laser ultrasound imaging of defects in curved structures with a flexible ultrasonic transducer. Laser ultrasonics 1,2 is an interesting technique for the inspection of. This optical methodology provides a repeatable, broad band generation source and an.
Jul, 2011 laser ultrasonic inspection of a doublecurvature fullbarrel composite by an iplus iii system from iphoton solutions. Inspection of cracks with focused angle beam laser ultrasonic. Par systems is the only company in the world that builds laser ultrasonic systems specifically configured to efficiently analyze aerospace components. An enlightening advancement in nondestructive evaluation ewi has significant experience with laser ultrasonic testing lut and has identified it as a mature technology ready for new industry applications. It can remotely and rapidly inspect curved surfaces on fixed or moving parts. Schematic layout of a laser ultrasonic inspection system performing tests on a steel tube. Pdf concepts and applications for laser ultrasonic testing in. In this paper, a laser ultrasonic technique for the inspection of am components is proposed.
Remote laser based ultrasonic inspection of weld joints for high volume industrial applications. Evaluation of laser ultrasonic testing for inspection of. Automatic noncontact defect inspection of cylindrical. The use of protective gas plays an important role on pores prevention, as. Broad uses of laser ultrasonic testing compared with conventional transducerbased ut, laser ut. We have our old friend the hcsr04 ultrasonic sensor pitted up against the newcomer, a tof10120 laser range finder. Pdf inspection of additive manufactured parts using laser.
Sears, laserultrasonic inspection of laser clad ded 316lss and ti64, in proceedings of the 23 rd intern. Generates and detects the full complement of ultrasonic. Furthermore, the results were validated using xray computed tomography ct and ultrasonic immersion testing uit. However, the propagation characteristics of ultrasonic waves vary depending on the type, bonding condition, mounting position of the sensor, and the. Applications of laser ultrasonic techniques sudipta gangopadhyay 1 physics department, syamsundar college, shyamsundar7424, west bengal, india abstract laser ultrasonics uses lasers to generate and detect ultrasonic waves. Laserbased evaluation of cement hydration noncontact. Laser ultrasonic inspection of plates using zerogroup. Laser ultrasonic ndt system laserut laser ultrasonic nondestructive inspection systems are used to verify the structural integrity of composite materials. Below is a brief description of what laser generated detected ultrasound is all about. Laser ultrasonics is a promising technology that fits the constraints of am online monitoring. However, in the early 1980s, general dynamics had already foreseen that this technology could provide a costeffective ultrasonic inspection for future composite applications and initiated a development.
However, in the early 1980s, general dynamics had already foreseen that this technology could provide a costeffective ultrasonic inspection. Laser ultrasonics may not quite be the buzz word in nondestructive testing ndt yet, but a handful of industries have recognized its benefits and have implemented a. The laserultrasonic uses two lasers, one of which emits short pulse to generate ultrasound in the material and another coupled with an optical interferometer is. The setup consists of a small, fibercoupled measurement head that is placed near the part to be evaluated, and a remote base station containing all. The reflected and transmitted waves are analyzed to disclose the properties of the welded interface. One of the earliest public disclosures of a laser ultrasonic system for the inspection of polymermatrix composites was in 1988 2. Laser ultrasonics may not quite be the buzz word in nondestructive testing.
Laser ultrasound, nondestructive testing ndt, defect identification, laser powder deposition, finite elements. Inspection of additive manufactured parts using laser. In addition, a laser ultrasonic system could easily be designed with automated ingress and egress to the inspection cell of a rack loaded with many brackets at one time, all tested from a single inspection view. Laser generation and detection of ultrasound in concrete. Dec 25, 2014 laser ultrasound imaging of defects in curved structures with a flexible ultrasonic transducer. Automatic noncontact defect inspection of cylindrical shell using a laser ultrasonic technique p. Detection of casting defects in aluminum slabs by laser. Development of laser ultrasonics inspection for online. Pipeline external corrosion analysis using a 3d laser scanner.
Generates and detects the full complement of ultrasonic waves bulk longitudinal, shear, surface, plate. An example laser system includes a laser, a plurality of pulse stretchers coupled together in series, a feedback module, and a lens assembly. Laser, ultrasound, visualization, nondestructive inspection. Laser shearography is an optical measurement technique for nondestructive testing ndt and quality control applications, commonly used on composites and metallic materials.
In this paper we propose a new approach for ultrasonic detection of small surface breaking cracks using laser based techniques. Defect reconstruction by nondestructive testing with. The reflecting properties of the various pee1p1ies used in aircraft industries are quite. Laser ultrasonic testing lut is a noncontact, nondestructive inspection technology that that uses lasers to generate and detect ultrasonic waves in the component under test. Parts which have been just manufactured, are generally provided with a protective cover peelply which can be later removed at assembly. Application of a laser ultrasonic method is developed for online monitoring of the friction stir spot welding fssw process. Laser ultrasonic setup used for noncontact offline inspection of the test specimens was made with the intent of future online implementation in the process. One of the main challenges of using laser ultrasonic techniques for nondestructive testing applications is the typically low signaltonoise ratio of the laser ultrasonic signals. Ultrasonic examination is the most widely used method for the detection and evaluation of piping systems flaws during inservice inspection isi of nuclear power plants. Kozhushko and peter hessa institute of physical chemistry, university of heidelberg, 69120 heidelberg, germany. Laser ultrasonics techniques and applications crc press. Pdf applications of laser ultrasound ndt methods on. If testing is performed manually, a coupling agent is usually applied between sample and measuring head.
Laser ultrasonics techniques and applications crc press book. Laser ultrasonics is a cutting edge nondestructive testing ndt method in which lasers are used to generate, and then measure, ultrasonic. Nondestructive testing ndt forms the most common and convenient way of inspecting parts. Ultrasonic inspection of aa60 laser welded joints 10 corresponds to the probe position related to the welding length figure 1b. Laser ultrasonic inspection of a doublecurvature fullbarrel composite by an iplus iii system from iphoton solutions. The advantages of laser ultrasonics for the inspection of. Laser ultrasonic imaging technique for nondestructive inspection of defects in threedimensional objects. The results demonstrate laser ultrasonic testing lut as a promising method for the noncontact inspection of additive manufactured components. A laser pulse is directed onto the sample under test and the interaction with the surface generates an ultrasonic pulse that propagates through the material. Due to production costs, there is a strong interest in reducing scrap rates and process monitoring. Inspection of additive manufactured parts using laser ultrasonics conference paper pdf available in aip conference proceedings 17061. This article presents a laser based ultrasonic technique lbut in ablation regime for inspection of internal defects using the pulsed highpower laser hpl and two wave mixing twm detector.
A laser pulse is directed onto the sample under test and the interaction with the surface generates an ultrasonic. The area so heated expands, generating normal and radial stresses and hence ultrasonic waves. Pdf laser ultrasonics shows great promise for online monitoring of product integrity in a number of industrial laser processes, including welding and. Nondestructive examination nde technology and codes. Laser ultrasonics is a contactless ultrasonic inspection technique based on excitation and ultrasound measurement using two lasers. Laser ultrasonic technique for laser powder deposition inspection. Metal, ceramics, polymer, composite inspection thickness. An enlightening advancement in nondestructive evaluation ewi has significant experience with laser ultrasonic testing lut and has identified it as a mature technology. Computational and experimental approach for nondestructive testing by laser shearography a thesis submitted to the faculty of the worcester polytechnic institute as a partial fulfillment of the. Laser ultrasonic inspection of additive manufactured components. In luis system figure 1, laser ultrasound is generated in thermoelastic mode 2, to ensure that the process is nondestructive. Concepts and applications for laser ultrasonic testing in european aircraft industry. Parametric optimization of pulseecho laser ultrasonic system.
Laser ultrasonics is a cutting edge nondestructive testing ndt method in which lasers are used to generate, and then measure, ultrasonic waves in a material. Laserinduced focused ultrasound for nondestructive. A modern detection laser typically delivers 1 kw of light power for 50. In the field of ultrasonic flaw detection, the inspection. The first book devoted to laser techniques in the generation and reception of ultrasonic waves in materials, laser ultrasonics. Laser ultrasonic testing lut combines the sensitivity of ultrasonic inspection with the flexibility of optical systems to deal with complex inspection challenges. The method of inner crack inspection with focused angle beam laser ultrasonic wave is shown in fig.
Ultrasonic inspection ut propagation of sound sound energy introduced in the part propagates travels through the material in the form of waves a discontinuity, such as a crack, will reflect some of the sound wave back to the transducer size of reflected signal depends on both the size of the. Evolution of industrial laserultrasonic systems for the. Laser ultrasonic imaging technique for nondestructive. Techniques and applications provides a full description of the state of the art in all fields involving both lasers and ultrasonics. Ultrasonic phasedarray system and determine if an adhesive thickness algorithm can be applied to the uscar production inspection equipment. The quality control of additive manufacturing am parts and the repeatability of am process are critical issues for the widespread of am especially for aerospace and healthcare sectors. In this paper, a laser ultrasonic technique for the. Par systems is the only company in the world that builds laser ultrasonic. Techniques and applications provides a full description of the state of.
For many years, a primary target for lut has been aircraft and structural composites. Laser ultrasonic testing lut is an inspection technology which shows potential for insitu monitoring of metallic am processes. From the point of view of one concerned with practical applications of ultrasonic inspection and measurement methods, laser ultrasonic systems offer the flexibility which, in principle, should permit remote ultrasonic measurements to be performed on objects at elevated temperatures or in hostile environments. The major european aircraft companies are engaged in a common project inca to investigate laser ultrasonic. Nondestructive inspection by visualization of laser. Ultrasonic identification of the structural changes due to the impact testing of a charpy specimen used for the reactor pressure vessel materials testing p. In the case of thick composite structures, this is even more problematic since composite materials have very strong sound attenuation.
Defect reconstruction by nondestructive testing with laser induced ultrasonic detection. For the detection in a remote manner an industrial laser vibrometer is used for the sensing of the ultrasonic. Regarding the laserultrasonic testing, surface acoustic wave generated and detected by lasers is used to detect surfacebreaking cracks. Bscan simulations with abaqus for laser ultrasonic inspection of structures. This new guy is being offered on all the usual channels amazon, ebay, etc and is very, very tiny. Phased array ultrasonic testing theory part 1 duration. The basic components of a laser ultrasonic system are a generation laser, a detection laser and a detector. Nondestructive inspection of adhesive bonds in metalmetal joints launched aug. Pulsed lasers permit a contactless excitation of longitudinal, shear and. It is a noncontact technique used to measure materials thickness, detect flaws and materials characterization. Nevertheless, developments should continue to improve performance, to make it well adapted to specific inspection or characterization tasks and more affordable. In conclusion, as far as the directivity or the frequency range of the ultrasonic waves are concerned, the laser generation appears well adapted to the testing.
A laser pulse is directed to the surface of a sample through a fiber or through free space. Laser ultrasonic inspection of plates using zerogroup velocity lamb modes dominique clorennec, claire prada, and daniel royer manuscript received april 22, 2009. Laserultrasonic interferometers utilize a detection laser capable of delivering very high laser power for a time duration equal to or longer than the ultrasonic experiment. Laserut ultrasonic test equipment laser non destructive. Congress on applications of lasers and electrooptics 2004. Laser ultrasound flexible system for noncontact inspection. The plurality of pulse stretchers is configured to stretch pulse widths of laser pulses provided by the laser and to output stretched laser pulses. Pdf laser ultrasonic inspection of laser cladded 316lss and ti64.
Laser ultrasonic inspection in ablation regime request pdf. Complete finalize and deploy an ultrasonic inspection system at one of the uscar production plants. As an overall conclusion, laser ultrasonics that was for a long time a laboratory curiosity has definitely now made its transition to industry. Mar 16, 2015 however, in order for these benefits to be realised, further development and integration of suitable monitoring and closed loop control systems are needed. Pulseecho ut, phased array ut, thermography, laser shot peening, nonlinear ut, ut spectroscopy, resonance, aircoupled ut, modal analysis, laser. The incident laser beam is absorbed by the material and converted into heat. Laser nondestructive testing an interesting technique that has enjoyed a lot of attention in the last few years and has become a major application for pulsed co 2 laser systems is the nondestructive testing of composite materials. A combined system of the laser ultrasonic testing and the laser peening, which has. Nondestructive inspection of adhesive bonds in metal. Nondestructive inspection of adhesive bonds in metalmetal.
Laser ultrasonic inspection of additive manufactured. Us20200052454a1 pulse stretching technique for laser bond. Twi has been developing laserultrasonic testing techniques for many years and is now able to provide services harnessing this relatively nascent technology to members. This approach does not monitor the interaction of a well established surface ultrasonic wave with an anomaly, as in the case of traditional pitch catch or pulse echo methods,but rather monitors the changes in the generated ultrasonic signal as the laser. A combined system of the laser ultrasonic testing and the laser. Based on the technology of fssw, laser generated ultrasonic waves in a good weld and nonweld area are simulated by a finite element method. Finalize and deploy an ultrasonic inspection system at one of the. A schematic layout of a laser ultrasonic system is shown in the figure.
The major european aircraft companies are engaged in a common project inca to investigate laser ultrasonic technology in order to get the maximum performances of such a non. Inspection of thick welded joints using laserultrasonic saft. Ewi has significant experience with laser ultrasonic testing lut and has identified it as a mature technology ready for new industry applications. Automatic noncontact defect inspection of cylindrical shell. Laser ultrasonic system optech ventures air1550twm laser ultrasonic interferometer and litron lasers nano sg 15010 generation laser precise noncontact laser ultrasonic system for testing, measuring, flaw detection and material characterisation. Pdf remote laserbased ultrasonic inspection of weld. When the arcline laser is irradiated onto the surface of the specimen, the shear wave generated by the arcline laser are pointfocused at the bottom of the specimen with an angle. Laser ultrasonic system optech ventures air1550twm laser ultrasonic interferometer and litron lasers nano sg 15010 generation laser precise noncontact laser ultrasonic system for testing.
Introduction in the field of nondestructive test, the ultrasonic inspection is a popular, lowcost and convenient technique. This method has the following features that make it superior to the conventional dete ction laser scanning method. We have recently developed a method 12 for visualizing the propagation of ultrasonic waves without detection laser probe but using generation laser. Laser ultrasonic testing lut is a remote, noncontact extension of conventional, contact or nearcontact ultrasonic testing ut. The development of laser ultrasonic visualization equipment. Standard ultrasonic techniques have the disadvantage of requiring direct contact between the measuring device and the sample.
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