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Acoustic leak testing
| Глоссарий по тестированию |
In leak testing, technique that uses elastic waves in the frequency range of 30 to 100 khz, which are generated by the flow of fluids through leaks.
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Action spectrum, английский
Plot of the desired spectral responsivity of an integral sensor versus wavelength, which may be photovoltaic, photochemical, or photobiological in nature. see also irradiance, effective.
Acoustic emission signal, английский
Electrical signal obtained through the detection of acoustic emission. acoustic emission testing (ae): passive nondestructive testing method that monitors a component or assembly for transient elastic waves and converts these ultrasonic waves into electrical signals. acoustic waves may be produced by the formation or movement of microstructural dislocations during crack propagation, melting, phase transformations or thermal stresses. acoustic impedance (z): frequency dependent property of a medium through which acoustic waves propagate in units of kg·s–1·m–2. in its simplified form, acoustic impedance is the product of longitudinal ultrasonic wave velocity (m·s–1) and material density (kgm·m–3). the relative transmission and reflection at an interface are governed in part by the acoustic impedances of the materials on each side of the interface. acoustic impedance, characteristic: in ultrasonic testing, acoustic impedance typical or characteristic of a particular material. acoustic impedance, specific: in ultrasonic testing, acoustic impedance in a particular test object or a defined volume of a specified material.
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