Period value of the minimum interval after which the

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period: Value of the minimum interval after which the same characteristics of a periodic waveform or a periodic feature repeat. 10 physical properties: Nonmechanical properties such as density, electrical conductivity, heat conductivity and thermal expansion. 10 pulse: Electronic signal that has a rapid increase in amplitude to its maximum value, followed by an immediate return. 5 pulser transducer: Transducer used as an artificial source, introducing a repeatable, transient signal to calibrate and verify an acoustic emission processor. Q qualification: Process of demonstrating that an individual has the required amount and the required type of training, experience, knowledge and abilities. 10 qualified: Having demonstrated the required amount and the required type of training, experience, knowledge and abilities. 10 quality: Ability of a process or product to meet specifications or to meet the expectations of its users in terms of efficiency, appearance, longevity and ergonomics. 10 quality assurance: Administrative actions that specify, enforce and verify a quality program. 10 quality control: Physical and administrative actions required to ensure compliance with a quality assurance program. Quality control may include nondestructive testing in the manufacturing cycle. 10 R recommended practice: Set of guidelines or recommendations. 10 Recommended Practice No. SNT-TC-1A: Set of guidelines published by the American Society for Nondestructive Testing, for employers to establish and conduct a qualification and certification program for nondestructive testing personnel. 10 recovery time: Time required for a test system to return to its original state after overload. reference threshold: Preset voltage level that has to be exceeded before an acoustic emission signal is detected and processed. This threshold may be adjustable, fixed or floating. 5 See also threshold level. ringdown count: See acoustic emission count. S sensor: Device that detects a material property or mechanical behavior (such as radiation or displacement) and converts it to an electrical signal. Probe; transducer . SI (International System of Units): Measurement system in which the following seven units are considered basic: meter, mole, kilogram, second, ampere, kelvin and candela. 10,16 signal: Physical quantity, such as electrical voltage, that contains information. 10,19 signal-to-noise ratio: Ratio of signal values (responses that contain information) to baseline noise values (responses that contain no information). See noise. 10,19 SNT-TC-1A: See Recommended Practice No. SNT-TC-1A. 431 Acoustic Emission Testing Glossary M OVIE . Pencil break source.
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source, acoustic emission: (1) Place of an acoustic emission event. 5 (2) Unique mechanism responsible for generation of acoustic emission. source location: Determination of the location of an acoustic emission source from arrival times by using multiple transducers.
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  • Fall '19
  • Nondestructive testing, Acoustic Emission

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