Lecture 2 Flashcards
1
Q
What is the “plastic case” component of the transducer?
A
- encloses all transducer components
- protects the transducer from damage
- a cracked transducer housing is a “NO, NO”
2
Q
Electrical Wire
A
- Transmits electrical voltage from the Piezoelectric crystal
- each active element requires an electrical contact
- frayed wire is a “NO,NO”
3
Q
Backing/ Dampening Material
A
- Attached to the back of Piezoelectric element
- made of epoxy reading impregnated with tungsten, or mixture of metal powder
- limits the ringing of pulse
4
Q
What is the purpose of the dampening material?
A
Improving spatial Resolution
Detail, axial
5
Q
How does the dampening material improve spatial resolution?
A
- decreases number of cycles in pulse
- decreases Pulse Duration
- decreases spatial Pulse Length
6
Q
What else is happing when dampening the Pulse?
A
- Increased frequencies present in a pulse (bandwidth)
- decreases transducer’s sensitivity (ability to emit a clean frequency)
- decreases quality factor of transducer
- decreases pulse amplitude
7
Q
Bandwidth
A
- The range of frequencies present in a pulse of sound is the bandwidth
- the main frequency is the center of operating frequency
8
Q
Broad Bandwidth
A
A pulse with many frequencies present
9
Q
Narrow Bandwidth
A
A pulse with freq frequencies present
*the shorter the pulse, the more frequencies present
