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surface wave technique

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Published: 01 August 2018
Fig. 48 Schematics for crack-growth monitoring in the laboratory. (a) Compression-wave normal crack-growth monitoring. (b) Surface-wave technique. Source: Ref 75 , 78 More
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
.... The experimental technique is very similar to the methods described earlier, with an additional gain stage to amplify the signals. Signal averaging can also be useful to increase the signal-to-noise ratio. Rayleigh waves have been shown to be capable of detection of surface-breaking and subsurface microcracks...
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
... (Rayleigh) wave and ultrasonic polar scan techniques. electronic equipment pulse-echo method single-element transducer-based system surface wave technique transducers transmission method ultrasonic inspection ultrasonic polar scan technique THIS ARTICLE CONSIDERS the two primary methods...
Book Chapter

Series: ASM Desk Editions
Publisher: ASM International
Published: 01 December 1998
DOI: 10.31399/asm.hb.mhde2.a0003235
EISBN: 978-1-62708-199-3
... the subsurface crack. Techniques of Microwave Inspection The following general approaches have been used in the development of microwave nondestructive inspection: Fixed-frequency, continuous-wave transmission Swept-frequency, continuous-wave transmission Pulse-modulated transmission Fixed...
Book Chapter

By Paul T. Vianco
Series: ASM Handbook
Volume: 6
Publisher: ASM International
Published: 01 January 1993
DOI: 10.31399/asm.hb.v06.a0001401
EISBN: 978-1-62708-173-3
... SOLDERING is one of the primary techniques for mass assembly of printed wiring boards involving through holes, surface mount devices, or a combination of these two technologies. A schematic of the wave soldering process is shown in Fig. 1 . A solder “fountain” or “wave” is created by a pump located...
Series: ASM Handbook
Volume: 17
Publisher: ASM International
Published: 01 August 2018
DOI: 10.31399/asm.hb.v17.a0006475
EISBN: 978-1-62708-190-0
... the microwave beam is directed perpendicularly into the surface. To detect a perpendicular planar discontinuity, such as an internal crack or seam, the microwave beam can be introduced into the material at an oblique angle, similar to ultrasonic shear-wave inspection of welds. When oblique incidence techniques...
Series: ASM Handbook
Volume: 8
Publisher: ASM International
Published: 01 January 2000
DOI: 10.31399/asm.hb.v08.a0003303
EISBN: 978-1-62708-176-4
... and tilt Free surface velocity using capacitors ( Ref 53 ), interferometric techniques ( Ref 45 , 54 ), or magnetic technique ( Ref 53 ) to record the particle-velocity time history at the rear of the specimen High-speed or streak photography to record shock wave breakout at the rear of the specimen...
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
... Techniques of Inspection When optical holography is applied to inspection of parts, generation of a three-dimensional image of the object, per se, is of little value. Furthermore, for opaque materials, optical holography is strictly limited to surface observations. Hence, if optical holography...
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
... spectrum showing the contributions of fundamental ( A 1 ) and second-harmonic ( A 2 ) amplitudes. Source: Ref 37 Rayleigh surface waves only require access to a single side (surface) of the specimen. An air-coupled detection technique eliminates the inconsistent contact condition between...
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
... Abstract Microwave and guided wave (GW) nondestructive evaluation (NDE) techniques are capable of detecting corrosion damage, cracks, and other defect types in inaccessible areas. This article describes the operation principles of the techniques and provides information on hidden corrosion...
Series: ASM Handbook
Volume: 17
Publisher: ASM International
Published: 01 August 2018
DOI: 10.31399/asm.hb.v17.a0006472
EISBN: 978-1-62708-190-0
... technique provides information not only on the diffracted waves but also on the different propagation modes, such as: The lateral wave: This wave mode propagates following the shortest path between the transducers, and it is the first signal in the B-scan screen. This signal represents the surface...