What are transducers?

Someone suggested that the heat and vibrations in my
apartment might just be caused by transducers. So I
did some research and here is what I found. Long term
exposure can cause a lot of health problems and it's
not meant to be a fun device. Gang Stalkers are out to
hurt people and if they can't do it one way they will
do it another way.

Transducers

What are they.

ACCELEROMETERS TO SENSE THE VIBRATION
A transducer is a device which transfers one form of
energy to another. Modern vibration measurements
employ transducers which convert mechanical energy
into electrical energy. A most suitable transducer for
human vibration measurements is the accelerometer.
This produces an electrical output (ie charge,
voltage, current or change of resistance), that is
proportional to the acceleration (as well as
displacement and velocity : see the first lecture in
this course) to which it is exposed. The most common
types of accelerometers are piezoelectric or
piezoresistive.

What are they used for.

a) Vibration Testing
Vibration testing, in brief, is the shaking or
shocking of a component or assembly to see how it will
stand up to real world conditions. It is used in
applications ranging from circuit boards and aircraft
to vehicles and household appliances. Conducting these
tests in the field or the laboratory involves the use
of data analyzers, climatic chambers, controllers,
instruments and vibration exciters. Brüel & Kjær has a
complete product portfolio to provide you with the
whole excitation and measurement chain to establish
proof of quality according to national and
international standards, such as DIN, ISO, BS, MIL,
IEC and ASTM.


b) Tracking

The next set of applications would involve
piezoelectric cable. Piezoelectric cable behaves much
the same way as flat piezoelectric transducers only
the cable is much cheaper. The cable resembles the
standard coaxial cable that plugs into the TV, but the
piezo cable has a layer of piezoelectric polymer
wrapped into it. This cable could be used to create a
grid across the floor that could generate power from
people walking across it, or the more viable purpose
would be for tracking. These cables come with varying
degrees of sensitivity. The cable could be used to
track both the location and the orientation of a
person in the house. Based on the way they walk, the
floor might also be able to identify who the person
is.

Uses

You can select an accelerometer based on requirements
for Number of Orthogonal Measuring Axes, Sensitivity,
Dynamic Range, Frequency Range, Electrical Output,
Temperature Range and Weight. Or select from different
application-oriented groups where further
specifications are given: General Purpose; Structural
and Modal Analysis; High Temperature; High
Sensitivity; High Frequency; Miniature and Shock or
Human Vibration. Cables, mounting phase response and
environment specifications are other issues to be
considered when selecting an accelerometer.
Human health effects.

VIBRATION EFFECTS EFFECTS ON HEALTH

Severe, prolonged exposure to vibration can cause
injury to the body. The parts of the body most likely
to be injured during exposure to whole-body vibration
depend on the magnitude of vibration, distribution of
the motion within the body, and the vibration
frequency, direction and duration.

As mentioned before there is a shortage of conclusive
evidence to establish the probability and extent of
that injury or to provide a definite dose-effect
relationship between whole-body vibration and injury
or health damage. From the epidemiological studies,
subjective data, biodynamic models and a knowledge of
the physical properties of the body it is possible to
establish some of the health effects:

Spinal column disease and complaints: These are
perhaps the most common diseases associated with the
long-term exposure to whole-body vibration, where the
back is especially sensitive to the 4-12 Hz vibration
range.

Digestive system diseases: Often observed in persons
exposed to whole-body vibration over a long period of
time. Associated with the resonance movement of the
stomach at frequencies between 4 and 5 Hz.
Cardiovascular system effects: Prolonged exposure to
whole-body vibration at frequencies below 20 Hz
results in hyperventilation, increased heart rate,
oxygen intake, pulmonary ventilation and respiratory
rate.

MOTION SICKNESSVibration at frequencies of about 1 Hz and below,
which occur in many forms of transport, might induce
motion sickness (kinetosis). It results in nausea,
dizziness, vomiting and can affect the safe handling
of vehicles or the performance of other tasks.

The symptoms are worst between approximately 0.125 and
0.25 Hz, and only rarely occur due to frequencies
above 0.5 Hz.
Motion sickness in ships is believed to be caused by
vertical oscillation. Some form of air sickness are
also due to vertical oscillation of the body, but car
sickness is believed to be caused mainly by horizontal
motion and is associated with acceleration, braking
and cornering manoeuvres.

To find out more click on this link, and scroll three
quarters down.
http://www.eharassment.ca/reference/acoustic.htm