FRQ
PHYSICS ANSWERS
1. Reason to the existence of piezoelectricity?
The essential unit which is a rhomboid or cubic shaped cage made up
of atoms exists in some atomic lattice structures. Inside the cell,
the cage is responsible for holding single semi-mobile ion that has
numerous quantum position states. By applying electric field or by
distorting the cage (applied strain), the ions post state will
consequently shift. The basis or transformation to internal
electric field shifts from mechanical strain is provided by
coupling between the cage and central ion.
2. How can poling and depoling in piezoceramic materials? Be
explained?
The piezoceramics should undergo high electric field for a sometime
for the alignment of randomly oriented micro-dipoles in their
proper formulation since the chemical composition is not simply
responsible for the piezoelectric property of ceramics. This is
called “poling” due to alignment resulted from application of high
voltage. a “dislodging stress” is exerted on the micro-dipoles due
to the application of electric field in the opposite direction if
tried. There is only temporary change in polarization if low level
field are applied since it bounces back on removal. There is also
partly degradation of the polarization along with partial loss of
properties when medium fields are applied. Polarization in opposite
direction will be resulted if high fields are applied.
3. Is there a possibility of using piezoceramic actuators at
cryogenic temperatures?
The answer is yes. From down to zero degrees Kelvin, allpiezo
actuators continue to function even though it may appear
counter-intuitive. Since electric fields cannot be changed by
temperature at all and the inter-atomic electric fields are the
basis for the piezoelectric effect, the most common piezoceramics
does decrease due to piezo coupling as temperature drops. Most
importantly the motion of most materials drops to about one-seventh
of that measured at room at liquid helium temperatures.
PIEZO TECHNOLOGY ANSWERS
1.What is the process of eliminating vibration through
piezoceramics?
The process of vibration cancellation can be achieved through
attaching two piezoceramic sheets to the outer surface of the
object. They should be close to the point (in a beam) where
undesired bending needs to be controlled.The first sheet is used to
measure the strain on the surface. The data from a strain sensor is
put into a smart box. This gadget controls the power amplifier
which consequently drives second sheet.As a result, the
mechanically induced movement from second sheet produces vibrations
into the structure, which counter the other vibrations.
2.Is there a possibility of Piezo technology replacing magnetic
technology anytime in the future?
The possibility of Piezo technology replacing magnetic technology
is not possible. Magnetic technology is based on force without
physical contact. On the other hand, Piezo technology is purely
derived from forces having direct contact from bodies.For instance,
Piezo actuators have the capability of making all solenoids
obsolete. However, they are heavier which is why it is highly
improbably that magnetic technology will be forgotten because of
Piezo technology.The main interest in Piezo actuators is because of
the solenoids ability to work on less powe
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