Sensors - Unit 1 Flashcards
for midterms exam
a concept of Japanese origin and can be defined as the application of electronics and computer technology to control the motions of mechanical systems.
MECHATRONICS
defined as a black box which has an input and an output.
System
Which fields that Mechatronics uses to develop products, processes and systems with greater flexibility, ease in redesign and ability of
reprogramming.
electrical,
mechanical,
control and
computer engineering
Types of Actuators
Solenoids,
voice coils,
D.C. motors,
Stepper motors,
Servomotor,
hydraulics,
pneumatics.
Types of Sensors
Switches,
Potentiometer,
Photo - electrics,
Digital encoder,
Strain gauge,
Thermocouple,
accelerometer
defined as a black box which is used for making measurements.
A measurement system
Measurement system consists of the following three elements. What are those?
Sensor
Signal conditioner
Display System
It consists of transducer whose function is to convert the one form of energy
into electrical form of energy.
Additionally, it is a sensing element of measurement system that converts the input quantity being measured into an output signal which is related to the quantity.
Sensor
It receives signal from the sensor and manipulates it into a suitable condition for display.
Signal Conditioner
displays the data (output) from the signal conditioner by analog or digital.
Display System
A black box which is used to control its output in a pre-set value.
Control System
If there is no feedback device to compare the actual value with desired one.
Open Loop Control System
If there is feedback device to compare the actual value with desired one.
Closed Loop Control System
The elements of closed loop control system are? Give 3
Comparison Unit
Control Unit
Correction Unit
Process Unit
Measurement Device
SYSTEM OF CONTROLLING WATER LEVEL
__________Water level in the tank
__________Initial setting of the float and lever position comparison
__________The lever
__________ Difference between the actual & initial setting of the lever positions
__________ The pivoted lever
__________ The flap opening or closing the water supply
__________ The water level in the tank
__________The floating ball and lever
-Controlled variable:
-Reference variable:
-Element
-Error signal
-Control Unit
-Correction Unit:
-Process:
-Measuring device:
The number of performance related parameters of a transducer or measurement system.
Specification
various specifications of a sensor/transducer system
- Range
- Span
- Error
- Accuracy
- Sensitivity
- Nonlinearity
- Hysteresis
- Resolution
- Stability
- Deadband/time
- Repeatability
- Response time
CLASSIFICATION OF SENSORS
for - A. Displacement, position and proximity sensors
A. Displacement, position and proximity sensors
* Potentiometer
* Strain-gauged element
* Capacitive element
* Differential transformers
* Eddy current proximity sensors
* Inductive proximity switch
* Optical encoders
* Pneumatic sensors
* Proximity switches(magnetic)
* Hall effect sensors
CLASSIFICATION OF SENSORS
for -B. Velocity and motion
B. Velocity and motion
* Incrementalencoder
* Tachogenerator
* Pyro electricsensors
CLASSIFICATION OF SENSORS
for - C. Force
C. Force
* Strain gauge loadcell
CLASSIFICATION OF SENSORS
for -D. Fluid pressure
D. Fluid pressure
* Diaphragm pressure gauge
* Capsules, bellows, pressure tubes
* Piezoelectric sensors
* Tactile sensor
CLASSIFICATION OF SENSORS
for - E. Liquid flow
E. Liquid flow
* Orifice plate
* Turbine meter
CLASSIFICATION OF SENSORS
for - F. Liquid level
F. Liquid level
* Floats
* Differential pressure
CLASSIFICATION OF SENSORS
for - G. Temperature
G. Temperature
* Bimetallic strips
* Resistance temperature detectors
* Thermistors
* Thermo-diodes and transistors
* Thermocouples
* Light sensors
* Photodiodes
* Photoresistors
