Chapter 8. Transducer My Fav! Flashcards
The transducer converts electricity to sound and then _________
Electricity
What is the name of the PZT
Lead Zirconate titanate
The PZT is also known as
Ceramic, active element, or crystal
Thickness of the PZT is _____ of the wavelenght
Half
What is the function of the matching layer
Reduces impedance difference between PZT and skin (matches skin)
Protects active element
Thickness of matching layer is ____ of wavelength
1/4
What is the function of the acoustic insulator
Absorbs extra electric and sound energy that we don’t need
What is the function of the electric shield
Protects transducer from outside electrical signals/interference
What is the function of the case
Protect pt from electrical shock
What is the function of the backing material
Stops the wave from ringing too long, we need short pulses to create imaging
What are the three consequences of having a backing material
Decreased sensitivity, wide bandwidth, low quality factor
Explain the decrease sensitivity of backing material
Because backing material absorbs energy, only a little bit is sent to the machine through the wire
Explain the wide bandwidth
Wide range of frequencies, picks up low and high good and bad
Explain low quality factor
Short pulse equals lower Q factor
What type of transducer have high quality factor
Therapeutic transducer
