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pulse-echo technique

См. также в других словарях:

  • Pulse-Doppler radar — Pulse Doppler is a radar system capable of not only detecting target location (bearing, range, and altitude), but also measuring its radial velocity (range rate). It uses the Doppler effect to determine the relative velocity of objects; pulses of …   Wikipedia

  • Echo sounding — pulses directed from the surface or from a submarine vertically down to measure the distance to the bottom by means of sound waves. HistoryAfter the disaster of the Titanic in 1912, the German physicist Alexander Behm conducted some research to… …   Wikipedia

  • echo — 1. A reverberating sound sometimes heard during auscultation of the chest. 2. In ultrasonography, the acoustic signal received from scattering or reflecting structures or the corresponding pattern of light on a CRT or ultrasonogram. 3. In… …   Medical dictionary

  • Écho-doppler — Échographie Doppler L échographie Doppler est un examen échographique en deux dimensions non invasif qui permet d explorer les flux sanguins intracardiaques et intravasculaires. Elle est basée sur un phénomène physique des ultrasons, l effet… …   Wikipédia en Français

  • echo planar imaging — a technique of magnetic resonance imaging in which the image is obtained in less than 50 msec; a single radiofrequency pulse is recalled several times in a series of echoes that are each encoded differently and from which the image can be… …   Medical dictionary

  • Spin echo — In nuclear magnetic resonance, spin echo refers to the refocusing of precessing nuclear spin magnetisation by a 180° pulse of resonant radiofrequency.The NMR signal observed following an initial excitation pulse (orange in diagram) decays with… …   Wikipedia

  • Radar Doppler pulsé — Un radar Doppler pulsé est un radar capable, non seulement de donner le cap, la distance et l altitude d une cible, mais aussi de mesurer sa vitesse radiale (portée vitesse). Pour cela il utilise l effet Doppler. Le retour des impulsions… …   Wikipédia en Français

  • Radar — For other uses, see Radar (disambiguation). A long range radar antenna, known as ALTAIR, used to detect and track space objects in conjunction with ABM testing at the Ronald Reagan Test Site on Kwajalein Atoll …   Wikipedia

  • Thermographic inspection — refers to the nondestructive testing of parts, materials or systems through the imaging of the thermal patterns at the object s surface. Strictly speaking, the term thermography alone, refers to all thermographic inspection techniques regardless… …   Wikipedia

  • Time of flight diffraction ultrasonics — Time of Flight Diffraction (TOFD) method of Ultrasonic inspection is a very sensitive and accurate method for nondestructive testing of welds for defects. TOFD is a computerised system that was invented in the UK in the 1970s for the nuclear… …   Wikipedia

  • Ultrasonic testing — Step 1 : The UT probe is placed on the root of the blades to be inspected with the help of a special borescope tool (video probe). Step 2 : Instrument settings are input. Step 3 : The probe is scanned over the blade root. In this case, an… …   Wikipedia

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