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SENSORS. BASIC FEATURES. Sensors are mostly electronic devices used to monitor or capture something. . For example, an optical sensor to count the number of items on the treadmill. A complete system that has a sensor and produces an electric output signal is called a transducer. FEATURES. - PowerPoint PPT Presentation
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BASIC FEATURES
SENSORS
Sensors are mostly electronic devices used to monitor or capture something.
For example, an optical sensor to count the number of items on the treadmill.
A complete system that has a sensor and produces an electric
output signal is called a transducer.
FEATURES
SUPPLY
The sensors are designed for industrial DC voltages (usually in the automation they use
24 volts), ac or universal (both)
OUTPUTS
If the electric output signal can be any value between certain limits, the sensor is analog. Typically, the controller receives the signal is digital and, therefore, uses an AD converter.
If it can be only two values, for example, 120mv and 5v, the sensor will be digital.
APPLICATIONS
Widely used in medicine, automation, robotics.
Medical Pulse Sensor
TYPES OF SENSORS
Depending on your application there are various families and types of sensors for use
POSITION
Compared with a reference, determine the physical location
Potentiometer (resistance)Ultrasonic (measures time by
acoustic waves)Encoders (angular motion)
Inductive (capture ferromagnetic materials by varying
the electromagnetic field)Capacitive (electrostatic field variation).
OPTICAL
The transmitter sends the light that is captured by the receiver
TEMPERATUREThe most common and cheapest is the thermocouple.
But it is not accurate for temperatures below 1 ºC
MAGNETIC
Detect magnets through the varying magnetic field