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ultrasonic polar scan technique

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Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 April 2013
DOI: 10.31399/asm.tb.imub.t53720267
EISBN: 978-1-62708-305-8
... scanning system. Also, advances in microprocessor technology have extended the data acquisition and signal processing capabilities of ultrasonic inspection systems. In most instances, the entire electronic assembly, including the controls and display, is contained in a single instrument. A typical...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2006
DOI: 10.31399/asm.tb.cw.t51820203
EISBN: 978-1-62708-339-3
... frequently to monitor in-service corrosion because of the simplicity and accuracy of the technique. Electrochemical techniques such as linear polarization resistance and electrochemical noise have moved from the laboratory to the processing plant and beyond to help with the detection of general and localized...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 January 2000
DOI: 10.31399/asm.tb.cub.t66910427
EISBN: 978-1-62708-250-1
... separately in this chapter, the other laboratory tests covered under this category are simulated atmosphere tests, salt-spray tests, and immersion tests. Only corrosion testing in the atmosphere is discussed in the section on field tests. Corrosion monitoring techniques are finally considered, covering...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 October 2005
DOI: 10.31399/asm.tb.faesmch.t51270019
EISBN: 978-1-62708-301-0
... radiography. Radiographic techniques are extensively used for the NDE of castings, weldments, boilers, and pressure vessels. Ultrasonic Inspection Ultrasonic inspection is used for detecting surface and subsurface flaws in metals, ceramics, and polymers. Ultrasonic waves are sent through the component...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 November 2019
DOI: 10.31399/asm.tb.mfadr7.t91110067
EISBN: 978-1-62708-247-1
..., the A-scan, B-scan and C-scan offer powerful ways to understand the nature of a sample’s interior, rapidly and non-destructively, which however requires some extent of experience. Polarity Analysis of Reflected Signals Information about delamination at internal interfaces in plastic-packaged ICs...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 1984
DOI: 10.31399/asm.tb.mpp.t67850267
EISBN: 978-1-62708-260-0
... between amplitude and optical-phase features and how they are revealed using appropriate illumination methods. It compares images obtained using bright field and dark field illumination, polarized and cross-polarized light, and interference-contrast techniques. It also discusses the use of photometers...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 November 2019
DOI: 10.31399/asm.tb.mfadr7.t91110042
EISBN: 978-1-62708-247-1
... of that filter. If the axes are arranged to be orthogonal, then all the light will be extinguished. Figure 25 Crossed polarizers extinguish light vectors not parallel to the axis of the polarizer. Used by persmission from www.molecularexpressions.com . Polarization techniques are effective...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 June 1988
DOI: 10.31399/asm.tb.eihdca.t65220143
EISBN: 978-1-62708-341-6
...]</xref> Ultrasonic temperature-measuring techniques make use of transducers which generate and detect sound waves in the workpiece. The velocity of sound for a given material is a function of the material’s elastic modulus and density. Because these properties are functions of temperature, the speed of sound can...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 1984
DOI: 10.31399/asm.tb.mpp.t67850165
EISBN: 978-1-62708-260-0
... with some isotropic metals polarized light reveals additional detail when these metals are etched with certain etchants. Some of the anodizing techniques used on isotropic metals (such as aluminum) require subsequent examination of the metal with polarized light. In some metals, certain phases...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2003
DOI: 10.31399/asm.tb.cfap.t69780089
EISBN: 978-1-62708-281-5
... pattern. Other useful tools are infrared spectroscopy for the qualitative and quantitative analysis of raw materials and, in certain cases, extent of cure; thermal analysis techniques, including differential scanning calorimetry and thermogravimetric and thermomechanical analyses for chemical reactivity...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 November 2019
DOI: 10.31399/asm.tb.mfadr7.t91110550
EISBN: 978-1-62708-247-1
... microscopy (SAM) allows non-destructive imaging of certain defect types hidden below the top surface, including the delamination of interfaces, cracks, and voids [14] . An ultrasonic wave transducer is scanned horizontally above the surface and the reflected wave amplitude and polarity are plotted to form...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 April 2013
DOI: 10.31399/asm.tb.imub.t53720063
EISBN: 978-1-62708-305-8
... Abstract Machine vision is a means of simulating the image recognition and analysis capabilities of the human eye/brain system with electronic and electromechanical techniques. This chapter discusses four basic steps in the machine vision process, namely image formation, image preprocessing...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 August 1999
DOI: 10.31399/asm.tb.caaa.t67870191
EISBN: 978-1-62708-299-0
... and procedures are necessary, and total design should incorporate these wherever possible. In critical areas, design for on-line monitoring and inspection will also be important. The human factor in such procedures is often overlooked. The need for better techniques, standardization, and mechanization or full...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 July 2009
DOI: 10.31399/asm.tb.bcp.t52230459
EISBN: 978-1-62708-298-3
... . A scanning electron micrograph of S-200 hot pressed beryllium powder after being pitted is shown in Fig. 25.16 . It is evident that there is preferred attack in the material, depending on the crystallographic orientation. Fig. 25.15 Potentiodynamic polarization curves of single-crystal beryllium...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 1984
DOI: 10.31399/asm.tb.mpp.9781627082600
EISBN: 978-1-62708-260-0
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 1984
DOI: 10.31399/asm.tb.mpp.t67850060
EISBN: 978-1-62708-260-0
... importance, since the true microstructure may be partially or fully obscured by poor technique or execution. Improperly prepared samples can lead to erroneous interpretations, which can produce disastrous, expensive consequences. While every sample need not be perfectly prepared to publication quality, any...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2015
DOI: 10.31399/asm.tb.cpi2.9781627082822
EISBN: 978-1-62708-282-2
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2015
DOI: 10.31399/asm.tb.cpi2.t55030380
EISBN: 978-1-62708-282-2
... ef ciency. The ratio of the actual corrosion (weight loss) of an anode to the theoretical corrosion (weight loss) calculated by Faraday s law from the quantity of electricity that has been generated by the anode during the corrosion. anode effect. The effect produced by polarization of the anode...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 1989
DOI: 10.31399/asm.tb.dmlahtc.t60490265
EISBN: 978-1-62708-340-9
... and permits identification of the causes of defects; (2) the bore hole facilitates magnetic-particle and ultrasonic inspection, thus supplementing NDE data obtainable by ultrasonic inspection from the periphery; (3) samples of the bore material permit characterization of the current mechanical properties...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 January 2017
DOI: 10.31399/asm.tb.sccmpe2.t55090419
EISBN: 978-1-62708-266-2
..., their undesirable side effects on the overall analysis must be considered. Ultrasonic inspection can be used for online monitoring, provided surface contact is maintained. Unfortunately, this technique is time intensive and requires highly skilled personnel. Therefore, it is often impractical for thoroughly...