15d assignment
Describe, using practical circuit investigations and a range of measurement
devices (e.g. oscilloscope, multi-meters, data logger), the principles of operation
of the following types of transducers:
Passive (sensors) – Light Dependent Resistor (LDR), thermistor, reed switch and strain gauge using a
Wheatstone bridge and potential divider arrangement
Transducer and sensors
The operating and application of transducer
Name of Is it Operational principles Application
transducer passive
or
active?
Light dependent Passive The light dependent resistor as The light dependent
resistor it says in the title is that it resistor is used when it
depends on light. When the need light or it does not.
light drops on this device need light. A prove for
called the light dependent this is and also an
resistor the resistance application for this is that
decreases due to an increase the street alarm when
in the light that fall on it and there is natural light there
when the LDR is in a darker is no need and when it
place there is an increase in goes dark there is a need
the resistance. for this. Other examples
are alarm clocks, alarm
which is used for burglary.
Thermistor passive A thermistor is a device which One of the main
has resistance, and this important application of
resistance is dependent on the thermistor that it is
temperature. The reason why utilised and can be used
is called a thermistor is joining as also a temperature
of the thermal and resistor. sensor. They are within
The effect of this is that as the many applications such as
temperature increases this oven, fridges and also fire
causes the resistance to alarms. The other side of
increase as well. on the other modern application they
hand if the temperature are used in is the digital
decreases this causes the thermometers and they
resistance decreases. can be in cars also to for
the temperature
measure.
Strain gauge Passive This where there is a sensor Strain gauge can be used
and the applied force ranges, to measure a torque
or it can also differ with the which is applied by
resistance. Another important motor, turbine and also
thing is that strain gauge engine to the fans. This
, converts force, weight and equipment such as
tension into electrical turbines, generators and
resistance and adding this if turbines can be used in
needs to be it can be ships, power plants and
measured. refineries.
Reed switch Passive It has a mechanism (a system The reason why the reed
that has parts which work switch is important
together as a machine) and because they can be used
this switches and this has in cars for fluid level
ferromagnetic blades and sensors for the car brakes
these blades are split by and fluid reservoirs and it
something called a micron. can control oil levels for
When the magnets come close the motor. The use of
to the blades reed switches can be used
in brakes, air bags and
seat doors.
thermocouple A thermocouple is a device Thermocouple can be
from the two metals which are used in many application
different. On each metal they such as home appliances
are coiled together at the end and also it can be used in
of each one and they are both industrial process. Where
near a temperature. The thermocouples can be
reason why they are near the sued in electric power
temperature is due to sense. In generation, to furnace
a thermocouple it has a work monitor and also control,
function and this energy which for food and also can be
is required by the metal to used in the process of
break away from the metal beveraging
and the material which are in
the thermocouple is different.
the work function difference
produces a potential which is
called a junction electromotive
force this is where the electron
from a metal move from a
larger work function to a
smaller work function. If the
two metals at the other end of
the thermocouple are at the
same temperature, then the
electromotive force at the two
junction will oppose each
other.
Moisture sensor Passive
Pressure sensor The aim of a pressure sensor The materials and the
and what is can do is that it is other things which it
Describe, using practical circuit investigations and a range of measurement
devices (e.g. oscilloscope, multi-meters, data logger), the principles of operation
of the following types of transducers:
Passive (sensors) – Light Dependent Resistor (LDR), thermistor, reed switch and strain gauge using a
Wheatstone bridge and potential divider arrangement
Transducer and sensors
The operating and application of transducer
Name of Is it Operational principles Application
transducer passive
or
active?
Light dependent Passive The light dependent resistor as The light dependent
resistor it says in the title is that it resistor is used when it
depends on light. When the need light or it does not.
light drops on this device need light. A prove for
called the light dependent this is and also an
resistor the resistance application for this is that
decreases due to an increase the street alarm when
in the light that fall on it and there is natural light there
when the LDR is in a darker is no need and when it
place there is an increase in goes dark there is a need
the resistance. for this. Other examples
are alarm clocks, alarm
which is used for burglary.
Thermistor passive A thermistor is a device which One of the main
has resistance, and this important application of
resistance is dependent on the thermistor that it is
temperature. The reason why utilised and can be used
is called a thermistor is joining as also a temperature
of the thermal and resistor. sensor. They are within
The effect of this is that as the many applications such as
temperature increases this oven, fridges and also fire
causes the resistance to alarms. The other side of
increase as well. on the other modern application they
hand if the temperature are used in is the digital
decreases this causes the thermometers and they
resistance decreases. can be in cars also to for
the temperature
measure.
Strain gauge Passive This where there is a sensor Strain gauge can be used
and the applied force ranges, to measure a torque
or it can also differ with the which is applied by
resistance. Another important motor, turbine and also
thing is that strain gauge engine to the fans. This
, converts force, weight and equipment such as
tension into electrical turbines, generators and
resistance and adding this if turbines can be used in
needs to be it can be ships, power plants and
measured. refineries.
Reed switch Passive It has a mechanism (a system The reason why the reed
that has parts which work switch is important
together as a machine) and because they can be used
this switches and this has in cars for fluid level
ferromagnetic blades and sensors for the car brakes
these blades are split by and fluid reservoirs and it
something called a micron. can control oil levels for
When the magnets come close the motor. The use of
to the blades reed switches can be used
in brakes, air bags and
seat doors.
thermocouple A thermocouple is a device Thermocouple can be
from the two metals which are used in many application
different. On each metal they such as home appliances
are coiled together at the end and also it can be used in
of each one and they are both industrial process. Where
near a temperature. The thermocouples can be
reason why they are near the sued in electric power
temperature is due to sense. In generation, to furnace
a thermocouple it has a work monitor and also control,
function and this energy which for food and also can be
is required by the metal to used in the process of
break away from the metal beveraging
and the material which are in
the thermocouple is different.
the work function difference
produces a potential which is
called a junction electromotive
force this is where the electron
from a metal move from a
larger work function to a
smaller work function. If the
two metals at the other end of
the thermocouple are at the
same temperature, then the
electromotive force at the two
junction will oppose each
other.
Moisture sensor Passive
Pressure sensor The aim of a pressure sensor The materials and the
and what is can do is that it is other things which it
