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Near field (ut)
| Глоссарий терминов по технологиям неразрушающего контроля (NDT) |
The region of the ultrasonic beam adjacent to the search unit, having complex beam profiles; is also known as the fresnel zone. the length of the near field extends from the face of the search unit to the point at which the far field begins and is given by the equation
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Ultrasonic, английский
- Manufacturers` association ассоциация фирм — изготовителей изделий с использованием ультразвука
- Of or relating to acoustic vibration frequencies greater than about 20 khz.
- Pertaining to acoustic vibration frequencies greater than about 20 khz.
- Of or relating to acoustic vibration frequencies greater than about 20 khz.7,22
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Contrast ratio (pt, mt), английский
The relative amount of light emitted or reflected as between an indication and its background.
Compton absorption (compton effect) (rt), английский
The reduction of the energy of an incident photon by its interaction with an electron. part of the photon energy is transferred to the electron (compton electron or recoil electron) and part is redirected as a photon of reduced energy.
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