Flashcards in Transducers & Beams Deck (49):
Size of transducer element or group of elements.
No uniform driving of elements in an array to reduce grating lobes.
A transducer assembly containing several piezoelectric elements.
In the direction of the transducer axis. Parallel.
The minimum reflector separation along the sound path that is required to produce separate echoes.
Region containing continuous wave sound; region through which a should pulse propagates.
Combination of piezoelectric ceramic & non piezoelectric.
Curved linear array.
Temperature at which an element material loses it's piezoelectric properties.
Materials attached to the rear face of a transducer element to reduce pulse duration; the process of pulse duration reduction.
The ability to image fine details and to distinguish closely spaced reflectors.
A thin, flat, circular object.
Aperture that increases with increasing focal length (to maintain constant focal width.)
The piezoelectric component of a transducer assembly.
The detail resolution in the direction perpendicular to the scan plane. It is equal to the section thickness and is the source of section thickness artifact.
The region of a sound beam in which the beam diameter increases as the distance from the transducer increases. FAR FIELD.
Distance from a focused transducer to the center of a focal region or to the location of the spatial peak intensity.
Region of minimum beam diameter and area.
Length of the focal region.
The concentration of a sound beam into a smaller beam area that wouldn't exist otherwise.
Additional waker beams of sound traveling out in direction different from the primary beam as a result of the multi element structure of a transducer's arrays.
Perpendicular to the direction of sound travel.
Minimum reflector separation perpendicular to the sound path that is required to produce separate echoes.
Lead Zirconate Titanate
A ceramic piezoelectric material. PZT
A curved material that focusses a sound or light beam.
Adjectival form of line.
Array made of rectangular elements arranged in a line.
Linear Phased Array
Linear array operated by applying voltage pulses to all elements, but with small time differences to direct ultrasound pulses out in a various direction.
Linear Sequenced Array
Linear array operated by applying voltage pulses to groups of element sequentially.
Material attached to the front face of a transducer elements to reduce the reflection a the transducer surface.
The narrowing of a sound beam that occurs with an unfocused flat transduce element.
The region of a sound beam in which the beam diameter decreases as the diastase from the transducer increases. NEAR FIELD.
Preferred (max efficiency) frequency of operating a transducer.
An array that steers and focuses the beam electrically (with short time delay).
Phased Linear Array
Linear Sequenced array with phased focusing added; linear sequenced array with phased steering of pulses to produce a parallelogram shaped display.
Conversion of pressure to electric voltage.
A geometric figure bounded by two radii and the arc of the circle included between them.
Ability of an imaging system to detect t weak echoes.
Weaker beam of sound traveling out from a since element in directions from those of the primary beam.
The region of a medium that contains virtually all of the sound produced by a transducer.
An emitter of ultrasound; transducer.
A device that converts energy from one to another
Transducer elements with damping and matching materials assembled in a case.
A device that converts electric energy to ultrasound energy and vice versa.