For the detection in a remote manner an industrial laser vibrometer is used for the sensing of the ultrasonic. Osa application of laser ultrasonic method for online. Applications of laser ultrasound ndt methods on composite structures in aerospace industry. The area so heated expands, generating normal and radial stresses and hence ultrasonic waves. Ultrasonic inspection of aa60 laser welded joints 10 corresponds to the probe position related to the welding length figure 1b. Pdf concepts and applications for laser ultrasonic testing in. Kozhushko and peter hessa institute of physical chemistry, university of heidelberg, 69120 heidelberg, germany. The reflected and transmitted waves are analyzed to disclose the properties of the welded interface. Laser ultrasonics is a promising technology that fits the constraints of am online monitoring. Due to production costs, there is a strong interest in reducing scrap rates and process monitoring. Defect reconstruction by nondestructive testing with laser induced ultrasonic detection. Please read the references for further information as it is a very broad and area which would be impossible to thoroughly cover here. Laser ultrasonic inspection of plates using zerogroup velocity lamb modes dominique clorennec, claire prada, and daniel royer manuscript received april 22, 2009. This new guy is being offered on all the usual channels amazon, ebay, etc and is very, very tiny.
Complete finalize and deploy an ultrasonic inspection system at one of the uscar production plants. It can remotely and rapidly inspect curved surfaces on fixed or moving parts. Par systems is the only company in the world that builds laser ultrasonic systems specifically configured to efficiently analyze aerospace components. Laser ultrasonic testing lut is an inspection technology which shows potential for insitu monitoring of metallic am processes. Pdf laser ultrasonic inspection of laser cladded 316lss and ti64.
The plurality of pulse stretchers is configured to stretch pulse widths of laser pulses provided by the laser and to output stretched laser pulses. Broad uses of laser ultrasonic testing compared with conventional transducerbased ut, laser ut. Automatic noncontact defect inspection of cylindrical. Laser ultrasonics is a cutting edge nondestructive testing ndt method in which lasers are used to generate, and then measure, ultrasonic. 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. Laser ultrasonics may not quite be the buzz word in nondestructive testing. Laser ultrasonic techniques are used to examine the propagation of ultrasonic waves in concrete. Parts which have been just manufactured, are generally provided with a protective cover peelply which can be later removed at assembly. An enlightening advancement in nondestructive evaluation ewi has significant experience with laser ultrasonic testing lut and has identified it as a mature technology. Laser ultrasonic inspection of additive manufactured components. A laser pulse is directed to the surface of a sample through a fiber or through free space.
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. 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. Develop a written procedure and provide initial training to inspection personnel. Development and applications of laserultrasonic testing in. Laser shearography is an optical measurement technique for nondestructive testing ndt and quality control applications, commonly used on composites and metallic materials. Laser ultrasonic setup used for noncontact offline inspection of the test specimens was made with the intent of future online implementation in the process. This optical methodology provides a repeatable, broad band generation source and an. We have our old friend the hcsr04 ultrasonic sensor pitted up against the newcomer, a tof10120 laser range finder. 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. Laser generation and detection of ultrasound in concrete. Laser ultrasonic inspection in ablation regime request pdf. Laser ultrasonic inspection of plates using zerogroup. 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. Congress on applications of lasers and electrooptics 2004.
A laser pulse is directed onto the sample under test and the interaction with the surface generates an ultrasonic. Ultrasound is today one of the commonest nondestructive methods in industry, in particular for the inspection of composites in the aerospace industry. 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. Pdf remote laserbased ultrasonic inspection of weld. 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. In the case of thick composite structures, this is even more problematic since composite materials have very strong sound attenuation. Pdf bscan simulations with abaqus for laser ultrasonic. Laserbased evaluation of cement hydration noncontact. In this paper, a laser ultrasonic technique for the inspection of am components is proposed. The use of protective gas plays an important role on pores prevention, as.
Pipeline external corrosion analysis using a 3d laser scanner. Laserinduced focused ultrasound for nondestructive. 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. Evolution of industrial laserultrasonic systems for the.
The incident laser beam is absorbed by the material and converted into heat. 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. The method of inner crack inspection with focused angle beam laser ultrasonic wave is shown in fig. 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. Application of a laser ultrasonic method is developed for online monitoring of the friction stir spot welding fssw process. Pdf applications of laser ultrasound ndt methods on. 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. Laser ultrasonics is a contactless ultrasonic inspection technique based on excitation and ultrasound measurement using two lasers. Laser ultrasonic system optech ventures air1550twm laser ultrasonic interferometer and litron lasers nano sg 15010 generation laser precise noncontact laser ultrasonic system for testing. Nondestructive inspection of adhesive bonds in metalmetal.
Based on the technology of fssw, laser generated ultrasonic waves in a good weld and nonweld area are simulated by a finite element method. Pulsed lasers permit a contactless excitation of longitudinal, shear and. In this paper, a laser ultrasonic technique for the. As an overall conclusion, laser ultrasonics that was for a long time a laboratory curiosity has definitely now made its transition to industry. The advantages of laser ultrasonics for the inspection of. Concepts and applications for laser ultrasonic testing in european aircraft industry. 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. Laser ultrasonic inspection of a doublecurvature fullbarrel composite by an iplus iii system from iphoton solutions.
Schematic layout of a laser ultrasonic inspection system performing tests on a steel tube. 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. 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. Finalize and deploy an ultrasonic inspection system at one of the. Ultrasonic phasedarray system and determine if an adhesive thickness algorithm can be applied to the uscar production inspection equipment.
The results demonstrate laser ultrasonic testing lut as a promising method for the noncontact inspection. Below is a brief description of what laser generated detected ultrasound is all about. Metal, ceramics, polymer, composite inspection thickness. Twi has been developing laserultrasonic testing techniques for many years and is now able to provide services harnessing this relatively nascent technology to members. The first book devoted to laser techniques in the generation and reception of ultrasonic waves in materials, laser ultrasonics. Nondestructive inspection of adhesive bonds in metal.
Dec 25, 2014 laser ultrasound imaging of defects in curved structures with a flexible ultrasonic transducer. For many years, a primary target for lut has been aircraft and structural composites. Regarding the laserultrasonic testing, surface acoustic wave generated and detected by lasers is used to detect surfacebreaking cracks. If testing is performed manually, a coupling agent is usually applied between sample and measuring head. Laser ultrasonic technique for laser powder deposition inspection. Riedersynthetic aperture focusing of ultrasonic inspection. Generates and detects the full complement of ultrasonic.
Defect reconstruction by nondestructive testing with. 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 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. Parametric optimization of pulseecho laser ultrasonic system. Nondestructive inspection by visualization of laser. The obvious advantage of using laser ultrasound is that it can be totally remote over relatively large distances. An example laser system includes a laser, a plurality of pulse stretchers coupled together in series, a feedback module, and a lens assembly. Phased array ultrasonic testing theory part 1 duration. Laser ultrasonic ndt system laserut laser ultrasonic nondestructive inspection systems are used to verify the structural integrity of composite materials.
Inspection of additive manufactured parts using laser. Laser ultrasonics techniques and applications crc press book. Laser ultrasonics techniques and applications crc press. 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 combines the sensitivity of ultrasonic inspection with the flexibility of optical systems to deal with complex inspection challenges. It has advantages for testing metals, composite materials, ceramics, and liquids. Laser ultrasonic inspection of additive manufactured. Automatic noncontact defect inspection of cylindrical shell using a laser ultrasonic technique p. Development of laser ultrasonics inspection for online. It is a noncontact technique used to measure materials thickness, detect flaws and materials characterization. Laser ultrasonics 1,2 is an interesting technique for the inspection of. The development of laser ultrasonic visualization equipment. Laser induced focused ultrasound for nondestructive testing and evaluation victor v.
One of the earliest public disclosures of a laser ultrasonic system for the inspection of polymermatrix composites was in 1988 2. Us20200052454a1 pulse stretching technique for laser bond. Inspection of thick welded joints using laserultrasonic saft. 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.
Inspection of cracks with focused angle beam laser ultrasonic. Techniques and applications provides a full description of the state of. Inspection of additive manufactured parts using laser ultrasonics conference paper pdf available in aip conference proceedings 17061. The reflecting properties of the various pee1p1ies used in aircraft industries are quite. Laser ultrasonic testing lut is a remote, noncontact extension of conventional, contact or nearcontact ultrasonic testing ut. Ewi has significant experience with laser ultrasonic testing lut and has identified it as a mature technology ready for new industry applications. 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. 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. The results demonstrate laser ultrasonic testing lut as a promising method for the noncontact inspection of additive manufactured components. Laser ultrasound imaging of defects in curved structures with a flexible ultrasonic transducer. Generates and detects the full complement of ultrasonic waves bulk longitudinal, shear, surface, plate. In the field of ultrasonic flaw detection, the inspection. Sears, laserultrasonic inspection of laser clad ded 316lss and ti64, in proceedings of the 23 rd intern. In luis system figure 1, laser ultrasound is generated in thermoelastic mode 2, to ensure that the process is nondestructive.
Laser ultrasound flexible system for noncontact inspection. The basic components of a laser ultrasonic system are a generation laser, a detection laser and a detector. Detection of casting defects in aluminum slabs by laser. Nondestructive testing ndt forms the most common and convenient way of inspecting parts. 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. Furthermore, the results were validated using xray computed tomography ct and ultrasonic immersion testing uit. 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. Automatic noncontact defect inspection of cylindrical shell. A combined system of the laser ultrasonic testing and the laser peening, which has. Laser nondestructive testing ndt laser tea co2 laser.
Evaluation of laser ultrasonic testing for inspection of. Line scans transverse to the weld was performed with the generation and detection superimposed directly on the surface of the weld bead. Laser ultrasonic imaging technique for nondestructive inspection of defects in threedimensional objects. Pdf laser ultrasonics shows great promise for online monitoring of product integrity in a number of industrial laser processes, including welding and. A combined system of the laser ultrasonic testing and the laser. A modern detection laser typically delivers 1 kw of light power for 50. The major european aircraft companies are engaged in a common project inca to investigate laser ultrasonic. Ultrasonic identification of the structural changes due to the impact testing of a charpy specimen used for the reactor pressure vessel materials testing p. Par systems is the only company in the world that builds laser ultrasonic. However, in the early 1980s, general dynamics had already foreseen that this technology could provide a costeffective ultrasonic inspection. Jul, 2011 laser ultrasonic inspection of a doublecurvature fullbarrel composite by an iplus iii system from iphoton solutions. A schematic layout of a laser ultrasonic system is shown in the figure. Remote laser based ultrasonic inspection of weld joints for high volume industrial applications. 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.
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. Us7784348b2 articulated robot for laser ultrasonic. Laser, ultrasound, visualization, nondestructive inspection. Nevertheless, developments should continue to improve performance, to make it well adapted to specific inspection or characterization tasks and more affordable. 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. Laser ultrasonic imaging technique for nondestructive. Introduction in the field of nondestructive test, the ultrasonic inspection is a popular, lowcost and convenient technique. Pulseecho ut, phased array ut, thermography, laser shot peening, nonlinear ut, ut spectroscopy, resonance, aircoupled ut, modal analysis, laser. Development and applications of laserultrasonic testing. Nondestructive inspection of adhesive bonds in metalmetal joints launched aug. Laser ultrasound, nondestructive testing ndt, defect identification, laser powder deposition, finite elements.
Two inspection problems and their solutions two specific examples of difficult inspection scenarios will now be detailed. In this paper we propose a new approach for ultrasonic detection of small surface breaking cracks using laser based techniques. 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. This method has the following features that make it superior to the conventional dete ction laser scanning method. Laserut ultrasonic test equipment laser non destructive. Pdf inspection of additive manufactured parts using laser. Techniques and applications provides a full description of the state of the art in all fields involving both lasers and ultrasonics. Nondestructive examination nde technology and codes. However, the propagation characteristics of ultrasonic waves vary depending on the type, bonding condition, mounting position of the sensor, and the. 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. 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. Bscan simulations with abaqus for laser ultrasonic inspection of structures. Standard ultrasonic techniques have the disadvantage of requiring direct contact between the measuring device and the sample.
608 30 1164 746 1515 625 1549 1035 1578 532 258 987 702 59 1049 1265 1503 652 572 1581 1037 626 630 186 514 983 6 1522 917 1319 145 363 1516 278 880 137 353 981 982 522 669 609 1386 1407 409