1-20 of 62 Search Results for

electromagnetic acoustic transducers

Follow your search
Access your saved searches in your account

Would you like to receive an alert when new items match your search?
Close Modal
Sort by
Series: ASM Handbook
Volume: 17
Publisher: ASM International
Published: 01 August 2018
DOI: 10.31399/asm.hb.v17.a0006458
EISBN: 978-1-62708-190-0
... 30 0.10 0.19 0.078 12.000 3.324 Note: Values are approximate. Source: Ref 33 , 34 Fig. 2 Schematic diagram of the T-coil and R-coil circuits in an electromagnetic acoustic transducer (EMAT) system for one version of the pitch-catch configuration (that of a bulk shear-horizontal...
Series: ASM Handbook
Volume: 17
Publisher: ASM International
Published: 01 August 2018
DOI: 10.31399/asm.hb.v17.a0006461
EISBN: 978-1-62708-190-0
... … Low-frequency operation allows for inspection of highly attenuative materials. Noncontact scanning capability (air-coupled ultrasonic testing) Transducers are expensive; poor signal-to-noise ratio in certain applications 16 – 18 Electromagnetic acoustic transducer Line/cylindrical/other...
Series: ASM Handbook
Volume: 17
Publisher: ASM International
Published: 01 August 2018
DOI: 10.31399/asm.hb.v17.a0006471
EISBN: 978-1-62708-190-0
...Abstract Abstract This article discusses the advantages, disadvantages, applications, and selection criteria of various technologies and transduction modalities that can generate and detect ultrasonic waves. These include piezoelectric transducers, electromagnetic acoustic transducers (EMATs...
Series: ASM Handbook
Volume: 17
Publisher: ASM International
Published: 01 August 2018
DOI: 10.31399/asm.hb.v17.a0006478
EISBN: 978-1-62708-190-0
... advanced technologies that are being applied for nondestructive evaluation (NDE) of fiber-reinforced polymer-matrix composites. These include acoustic emission, ultrasonic, eddy-current, computed tomography, electromagnetic acoustic transducer, radiography, thermography, and low-frequency vibration methods...
Series: ASM Handbook
Volume: 13A
Publisher: ASM International
Published: 01 January 2003
DOI: 10.31399/asm.hb.v13a.a0003658
EISBN: 978-1-62708-182-5
... with the inspection surface and those that use standoff sensors such as electromagnetic acoustic transducers (EMATs) or laser generated/ received sound ( Ref 13 ). Contact sensors can be used in such applications as insulated piping systems, but a section of the insulation must be removed from the transmitter...
Series: ASM Handbook
Volume: 17
Publisher: ASM International
Published: 01 August 2018
DOI: 10.31399/asm.hb.v17.a0006479
EISBN: 978-1-62708-190-0
... Products, Austenitic Stainless Steel and Similar Alloys” ASTM E1962 “Standard Practice for Ultrasonic Surface Testing using Electromagnetic Acoustic Transducer (EMAT) Techniques” Source: Ref 1 A selection of European Committee for Standardization standards Table 2 A selection...
Series: ASM Handbook
Volume: 17
Publisher: ASM International
Published: 01 August 2018
DOI: 10.31399/asm.hb.v17.a0006446
EISBN: 978-1-62708-190-0
... electromagnetic acoustic transducer (EMAT) in a platelike component Fig. 14 Normalized acoustic nonlinearity parameter (β/β 0 ) as a function of irradiation fluence and annealing of specimens from a steel reactor pressure vessel. U, undamaged; IAR, irradiation-anneal-reirradiation; IARA, irradiation...
Series: ASM Handbook
Volume: 6A
Publisher: ASM International
Published: 31 October 2011
DOI: 10.31399/asm.hb.v06a.a0005638
EISBN: 978-1-62708-174-0
... Electromagnetic Acoustic Transducers (EMATs) Different materials generate different signals when being laser welded. Figure 9 ( Ref 30 ) depicts the stability of the keyhole for three different metals, from a single sensor. Single-sensor monitoring of the complex laser weld process does not ensure absolute...
Series: ASM Handbook
Volume: 17
Publisher: ASM International
Published: 01 August 2018
DOI: 10.31399/asm.hb.v17.a0006438
EISBN: 978-1-62708-190-0
..., infrared; UV, ultraviolet; UT, ultrasonic testing; EMAT, electromagnetic acoustic transducer; ET, electromagnetic testing; ACFM, alternating current field measurement; PEC, pulsed eddy current; RT, radiographic testing Fig. 2 Phased array UT depth sizing regression (in mm) for dissimilar metal...
Series: ASM Handbook
Volume: 17
Publisher: ASM International
Published: 01 August 2018
DOI: 10.31399/asm.hb.v17.a0006469
EISBN: 978-1-62708-190-0
... with an electromagnetic-acoustic probe with the appropriate coil configuration. See the article “Electromagnetic Acoustic Transducers for Nondestructive Evaluation” in this Volume. The most widely applied technique is to monitor the transmission along a plate between two probes with a fixed spacing. Another...
Series: ASM Handbook
Volume: 17
Publisher: ASM International
Published: 01 August 2018
DOI: 10.31399/asm.hb.v17.a0006460
EISBN: 978-1-62708-190-0
... Fig. 1 (a) The principle of laser-ultrasonics or of a “laser-ultrasonic transducer” compared to (b) conventional piezoelectric-based ultrasonics Fig. 2 Thermoelastic generation Fig. 7 Principle of optical detection of ultrasound with an interferometer. The interferometer...
Series: ASM Handbook
Volume: 17
Publisher: ASM International
Published: 01 August 2018
DOI: 10.31399/asm.hb.v17.a0006470
EISBN: 978-1-62708-190-0
... attenuation may preclude inspection. Fig. 15 (a) Data curve showing variation of acoustic pressure with distance ratio for a circular search unit. Distance ratio is the distance from the crystal face, d , divided by the length of the near field, N . (b) Image of a transducer pressure field, with Y...
Series: ASM Handbook
Volume: 17
Publisher: ASM International
Published: 01 August 2018
DOI: 10.31399/asm.hb.v17.a0006449
EISBN: 978-1-62708-190-0
... ultrasonic, electromagnetic, and eddy-current NDE full-body scans in a single pass ( Ref 2 , 5 ), which saves on time and equipment space requirements. Combination systems typically include multiple orientations of transducers, receivers, probes, and sensors so they can detect defects in multiple...
Series: ASM Handbook
Volume: 14B
Publisher: ASM International
Published: 01 January 2006
DOI: 10.31399/asm.hb.v14b.a0009152
EISBN: 978-1-62708-186-3
... ). These stress waves are accompanied by an acoustic emission. The acoustic emission excites a piezoelectric transducer that produces an output voltage, thereby indicating a crack in the workpiece or breakage in the tool ( Fig. 15 ). Fig. 15 Principle of acoustic emission sensor. Source: Ref 19...
Book Chapter

Series: ASM Desk Editions
Publisher: ASM International
Published: 01 December 1998
DOI: 10.31399/asm.hb.mhde2.a0003240
EISBN: 978-1-62708-199-3
... of an acoustic (ultrasonic) lens, which also is immersed in the tank. The practical limits for the object-beam transducer in a commercial system are a wave frequency of 1 to 10 MHz, a pulse length of 50 to 300 microseconds, and a pulse-repetition rate of 60 to 100 per second. This transducer is placed so...
Book Chapter

Series: ASM Desk Editions
Publisher: ASM International
Published: 01 December 1998
DOI: 10.31399/asm.hb.mhde2.a0003240
EISBN: 978-1-62708-199-3
... tank. The test object is positioned in the object plane of an acoustic (ultrasonic) lens, which also is immersed in the tank. The practical limits for the object-beam transducer in a commercial system are a wave frequency of 1 to 10 MHz, a pulse length of 50 to 300 microseconds, and a pulse...
Series: ASM Handbook
Volume: 1A
Publisher: ASM International
Published: 31 August 2017
DOI: 10.31399/asm.hb.v01a.a0006336
EISBN: 978-1-62708-179-5
... be touched, electromagnetic acoustic and optical transducers are available. Phased-array ultrasonics use constructive/destructive wave interaction between multiple elements (up to 128) to steer the beam and adjust focal depth. This allows improved probability of detection and signal-to-noise ratio compared...
Series: ASM Handbook
Volume: 6
Publisher: ASM International
Published: 01 January 1993
DOI: 10.31399/asm.hb.v06.a0001470
EISBN: 978-1-62708-173-3
... electronics) for the real-time control of the welding cell hardware and sensor data input. Ultrasonic sensors, of both the contacting (piezoelectric crystal) and noncontacting (electromagnetic acoustic transducer) varieties, have been used in the laboratory to evaluate the penetration characteristics...
Series: ASM Handbook
Volume: 6A
Publisher: ASM International
Published: 31 October 2011
DOI: 10.31399/asm.hb.v06a.a0005553
EISBN: 978-1-62708-174-0
... Technology—Robotic Welding , Lane J.D. , Ed., IFS (publications) , London, U.K. , 1987 , p 181 – 216 12. Hughes R.V. and Walduck R.P. , Electromagnetic Arc Path Control in Robot Plasma Welding , Int. J. Adv. Manuf. Technol. , Vol 1 ( No. 1 ), Sept 1985 , p 9 – 25 10.1007...
Series: ASM Desk Editions
Publisher: ASM International
Published: 01 December 1998
DOI: 10.31399/asm.hb.mhde2.a0003237
EISBN: 978-1-62708-199-3
... preamplifier and then to the main signal-processing equipment. The preamplifier can be miniaturized and housed inside the sensor enclosure, facilitating setup and reducing vulnerability to electromagnetic noise. Fig. 1 Typical construction of an acoustic-emission resonant sensor During an AE test...