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piezoelectric transducers

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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.a0006461
EISBN: 978-1-62708-190-0
...Summary of techniques for generation and detection of Rayleigh waves Table 1 Summary of techniques for generation and detection of Rayleigh waves Technique Schematic Source Advantages Disadvantages Ref Piezoelectric transducer applied directly Cylindrical symmetry Simple...
Series: ASM Handbook
Volume: 5
Publisher: ASM International
Published: 01 January 1994
DOI: 10.31399/asm.hb.v05.a0001226
EISBN: 978-1-62708-170-2
..., or about 18 kHz, to remove a variety of contaminants from parts immersed in aqueous media. This article describes the process, design considerations and the equipment in ultrasonic cleaning. The components used in the generation of ultrasonic wave include piezoelectric and magnetostrictive transducers...
Book Chapter

Series: ASM Desk Editions
Publisher: ASM International
Published: 01 December 1998
DOI: 10.31399/asm.hb.mhde2.a0003236
EISBN: 978-1-62708-199-3
... inspection are also addressed. The article concludes with a review of the advantages and disadvantages of ultrasonic inspection compared with other methods applications of the technique. couplants flaw detection nondestructive testing piezoelectric transducer elements pulse-echo method...
Book Chapter

Series: ASM Desk Editions
Publisher: ASM International
Published: 01 December 1998
DOI: 10.31399/asm.hb.mhde2.a0003236
EISBN: 978-1-62708-199-3
... of a transducer element. The transducer element is contained within a device most often referred to as a search unit (or sometimes as a probe). The active element in a search unit is a piezoelectric crystal. Piezoelectricity is pressure-induced electricity, a property characteristic of certain naturally occurring...
Series: ASM Handbook
Volume: 17
Publisher: ASM International
Published: 01 August 2018
DOI: 10.31399/asm.hb.v17.a0006441
EISBN: 978-1-62708-190-0
... to the development of the GWT method as it has become established was done mainly at Imperial College London, from approximately 1990 onward. This addressed the understanding of the modes and their interactions with defects ( Ref 13 , 14 , 15 , 16 , 17 , 19 , 20 ); the development of piezoelectric transducers...
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
... for second-harmonic generation are shown in Fig. 7 . This setup measures a relative value of the acoustic nonlinearity parameter using contact piezoelectric transducers. A function generator is used to create the signal at the fundamental frequency, which is fed into a high-voltage amplifier. Lithium...
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: 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...
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
... Limitations Immersion systems Excellent signal quality, no moving water, very clean and stable. Good spatial resolution at a prescribed focal zone of the transducer. Large stand-off distances are possible. Can be used in through-transmission (TT) and/or pulse-echo (PE) mode. Best resolution available...
Series: ASM Handbook
Volume: 21
Publisher: ASM International
Published: 01 January 2001
DOI: 10.31399/asm.hb.v21.a0003436
EISBN: 978-1-62708-195-5
... and stable Good spatial resolution at a prescribed focal zone of the transducer Large stand-off distances are possible Can be used in TT and/or PE mode Best resolution available using focused transducers Buoyancy and loading stresses on the part must be considered. Part size, plus...
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
..., and changes due to corrosion. The low cost of microwave NDE sensors is attractive, but as with any NDE procedure, training is essential to ensure reliable corrosion detection. Most GW ultrasonic sensors are piezoelectric transducers in either crystalline or piezo-composite format. Guided wave transducers...
Book: Machining
Series: ASM Handbook
Volume: 16
Publisher: ASM International
Published: 01 January 1989
DOI: 10.31399/asm.hb.v16.a0002159
EISBN: 978-1-62708-188-7
... to change the electrical energy into mechanical vibrations. Two types of converters are available for USM systems. One type uses a magnetostrictive device, and the other a quartz or a lead zirconate titanate piezoelectric transducer A horn to focus the vibratory energy on the tool. Horns as large as 130...
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
... for two transducer configurations. TVG, time-varied gain; I/O, input/output. Adapted from Ref 4 Fig. 5 Structure of a piezoelectric-based longitudinal (compression) wave transducer. Courtesy of Iowa State University Center for Nondestructive Evaluation Fig. 6 Examples of commercially...
Series: ASM Handbook
Volume: 4B
Publisher: ASM International
Published: 30 September 2014
DOI: 10.31399/asm.hb.v04b.a0005935
EISBN: 978-1-62708-166-5
... with a receiving sensitivity of −211 dB re 1V/μPa in a wide range of working temperatures between 40 and 80 °C (100 and 180 °F). The hydrophone is a piezoelectric transducer; that is, it uses piezoelectric ceramics as sensing elements. The piezoelectric sensing element and its internal supporting structure...
Series: ASM Handbook
Volume: 13A
Publisher: ASM International
Published: 01 January 2003
DOI: 10.31399/asm.hb.v13a.a0003669
EISBN: 978-1-62708-182-5
... in Ref 4 . The test apparatus ( Fig. 1 ) produces axial oscillation of the test specimen, which is partially immersed in the test liquid. This is accomplished using either a magnetostrictive or piezoelectric transducer driven by an electronic oscillator or amplifier. The transducer vibrates...
Series: ASM Handbook
Volume: 17
Publisher: ASM International
Published: 01 August 2018
DOI: 10.31399/asm.hb.v17.a0006466
EISBN: 978-1-62708-190-0
... (reflection mode sometimes is employed). In operation, ultrasound is introduced to the bottom surface of the sample by a piezoelectric transducer, and the transmitted wave is detected on the top side by a rapidly scanning laser beam. The other two types of microscopes primarily are reflection-mode...
Series: ASM Desk Editions
Publisher: ASM International
Published: 01 November 1995
DOI: 10.31399/asm.hb.emde.a0003062
EISBN: 978-1-62708-200-6
... strongly piezoelectric, and rapid strides have been made in their development and use as actuator motors, as ultrasonic transducers, and for electromechanical sensing. Piezoelectrics (PLZT) also elicit wide interest as electrooptic materials for such applications as high-speed shutters, switches, and light...
Series: ASM Handbook
Volume: 19
Publisher: ASM International
Published: 01 January 1996
DOI: 10.31399/asm.hb.v19.a0002363
EISBN: 978-1-62708-193-1
.... A piezoelectric transducer bonded to the specimen could measure acoustic emissions, and the amplitude of MAE depends on the magnetostriction coefficient, frequency, and amplitude of the driving field. Because the stress alters the magnetocrystalline anisotropy, MAE should also change with the applied stress...
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
... such as magnetostriction (MS) ( Ref 9 ). Although EMATs and piezoelectric transducers (PETs) each can generate and receive a variety of elastic-wave modes, they differ from each other in many very fundamental and important ways. For example, as already mentioned, EMATs do not use a mechanical couplant between...