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no-applied-signal test

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Series: ASM Handbook
Volume: 13A
Publisher: ASM International
Published: 01 January 2003
DOI: 10.31399/asm.hb.v13a.a0003644
EISBN: 978-1-62708-182-5
... available for laboratory studies of corrosion phenomena. The techniques and tests include no-applied-signal tests, small-signal polarization tests, large-signal polarization tests, scanning electrode techniques, and miscellaneous techniques. electrochemical corrosion electrochemical test...
Image
Published: 30 June 2023
Fig. 8 Principle of beamforming by delay and sum with phased array ultrasonic testing. (a) Transmission with elements to focus on a given point. (b) Signal reception with elements. (c) Delay and sum of received signals to form the beamformed signal. Red and blue represent transmission More
Series: ASM Handbook
Volume: 17
Publisher: ASM International
Published: 01 August 2018
DOI: 10.31399/asm.hb.v17.a0006476
EISBN: 978-1-62708-190-0
... and a sensor. The processing unit handles generation of outgoing signals, such as magnetizing/excitation, as well as filtering, amplification, and processing of the incoming MBN signal. Sensors are designed to apply an alternating magnetic field to the sample under test to elicit MBN emissions. Magnetic...
Book Chapter

Series: ASM Desk Editions
Publisher: ASM International
Published: 01 December 1998
DOI: 10.31399/asm.hb.mhde2.a0003233
EISBN: 978-1-62708-199-3
... is registered on a magnetic tape pressed onto the surface). Analysis of Leakage Field Data Most leakage-field testing applications require flaw detection and an estimate of the severity. Flaw characterization is based on the relation of leakage field signal amplitude to flaw size (and depth...
Series: ASM Handbook
Volume: 17
Publisher: ASM International
Published: 01 August 2018
DOI: 10.31399/asm.hb.v17.a0006464
EISBN: 978-1-62708-190-0
... as the test sample responds to excitation. However, direct viewing of the IR output requires subjective interpretation of the IR image and may not reliably detect small or subtle indications. It has become common practice to apply some form of signal processing to the data from the IR camera before...
Series: ASM Handbook
Volume: 6
Publisher: ASM International
Published: 01 January 1993
DOI: 10.31399/asm.hb.v06.a0001473
EISBN: 978-1-62708-173-3
... and machinery maintenance. Although the same methods and techniques can be applied in both areas, there are important differences in inspection goals and, therefore, in test procedures. In manufacturing, NDE is one of a series of quality-control techniques. The integration of these techniques...
Series: ASM Desk Editions
Publisher: ASM International
Published: 01 December 1998
DOI: 10.31399/asm.hb.mhde2.a0003237
EISBN: 978-1-62708-199-3
... Abstract Acoustic-emission inspection detects and analyzes minute acoustic-emission signals generated by discontinuities in materials under applied stress. This article discusses the types of acoustic emissions (continuous-type emissions and burst-type emissions) and applications, including...
Series: ASM Handbook
Volume: 17
Publisher: ASM International
Published: 01 August 2018
DOI: 10.31399/asm.hb.v17.a0006454
EISBN: 978-1-62708-190-0
... nondestructive testing (NDT) methods in two key respects. The signal originates in the material itself, not in an external source, and AE detects movement, while most other methods detect existing geometrical discontinuities. Characteristics of AE inspection compared with other inspection methods include...
Series: ASM Handbook
Volume: 17
Publisher: ASM International
Published: 01 August 2018
DOI: 10.31399/asm.hb.v17.a0006451
EISBN: 978-1-62708-190-0
... important points about TSA as a measurement technique become clear: Thermoelastic stress analysis will not work if only a static load is applied to a test article. Applying a state of pure shear to a test article will not result in a thermoelastic signal from an isotropic material. Several...
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
... surface. Flaw sizes are most commonly estimated by comparing the signal amplitudes of reflected ultrasound from an interface (either within the test piece or at the back surface) with the amplitude of ultrasound reflected from a reference reflector of known size, or by scanning to detect and map flaw...
Series: ASM Handbook
Volume: 17
Publisher: ASM International
Published: 01 August 2018
DOI: 10.31399/asm.hb.v17.a0006442
EISBN: 978-1-62708-190-0
... to the successful application of MBN measurement and signal interpretation. The article provides an overview of basic magnetic phenomena and dynamics in ferromagnetic materials that underlie the origin of MBN emissions. It describes the changes in the domain structure of the ferromagnetic material under an applied...
Book Chapter

Series: ASM Desk Editions
Publisher: ASM International
Published: 01 December 1998
DOI: 10.31399/asm.hb.mhde2.a0003239
EISBN: 978-1-62708-199-3
... crystals to show transient changes in temperature. The spatial resolution obtainable can be as small as 0.02 mm (0.0008 in.). In addition, because the color change is generally reversible, anomalies can be evaluated by repeating the test as many times as needed. Techniques for applying liquid crystals...
Series: ASM Handbook
Volume: 6A
Publisher: ASM International
Published: 31 October 2011
DOI: 10.31399/asm.hb.v06a.a0005628
EISBN: 978-1-62708-174-0
..., quasi-static mechanical tests, dynamic mechanical tests, and metallographic examination, are reviewed. The article reviews weld-quality monitoring using various process signals and provides a discussion on the on-line and off-line nondestructive evaluation methods of spot weld quality. dynamic...
Series: ASM Handbook
Volume: 17
Publisher: ASM International
Published: 01 August 2018
DOI: 10.31399/asm.hb.v17.a0006453
EISBN: 978-1-62708-190-0
...) typically are based on measurement and analysis of the surface temperature response of a test piece to externally applied stimulation. Unlike thermal process monitoring or preventative maintenance operations, in which the absolute temperature of a part is measured under steady-state conditions, thermal...
Series: ASM Handbook
Volume: 17
Publisher: ASM International
Published: 01 August 2018
DOI: 10.31399/asm.hb.v17.a0006450
EISBN: 978-1-62708-190-0
... of the close relationship between the impedance diagrams and the phasor diagrams. In a given circuit with input impedance Z , applying an impressed fixed current I , will produce a signal voltage E in accordance with Ohm’s law ( E = IZ ). This signal voltage can be displayed as a phasor. With I fixed...
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
... Abstract Guided wave testing (GWT) is a method of nondestructive evaluation for the inspection of pipelines. This article focuses mainly on explaining GWT as it is applied in routine established use, covered by standards, in the oil and gas industry and also introduces some of the other...
Series: ASM Handbook
Volume: 17
Publisher: ASM International
Published: 01 August 2018
DOI: 10.31399/asm.hb.v17.a0006443
EISBN: 978-1-62708-190-0
..., multiple sampling, and averaging techniques but is instead the noise due to nonrelevant signals generated in applying the NDE procedure to a specific hardware element. Fig. 1 Signal/noise density distribution for (a) large, (b) medium, and (c) small flaws Conditional Probability in NDE...
Series: ASM Handbook
Volume: 17
Publisher: ASM International
Published: 01 August 2018
DOI: 10.31399/asm.hb.v17.a0006462
EISBN: 978-1-62708-190-0
..., signaling a discontinuity. Usable on metal that is ferromagnetic (can be magnetized) to detect surface and near-surface discontinuities. Easy to use; portable equipment is available for field testing Specifically limited to ferromagnetic materials (e.g., ferritic steels). Requires trained personnel...
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
... of the test component. Typical inspection techniques examine some metric or signal against a threshold level. The signal may be a simple voltage or indicator level or it may be a complex multidimensional image; however, the basic concept of flaw detection is that the signal exceeds a detection threshold...
Series: ASM Handbook
Volume: 24A
Publisher: ASM International
Published: 30 June 2023
DOI: 10.31399/asm.hb.v24A.a0006982
EISBN: 978-1-62708-439-0
... of transmission and reception schemes. One of the principal modes, called focusing, consists of applying delays to the elements to focus the ultrasonic beam at a given point (called the focal point) inside the sample under test. The delay value pattern is called the delay law. Then, the signals received...