Sensor (SENSOR)

 
    ---- The sensor of physical quantities to be measured (e.g., length, speed, angle, acceleration, etc.) into readable, easy to handle another physical quantity (the most commonly used modern control is the electric signal), such a conversion processing means call the sensor.
    If the computer, programmable logic controller likened to automated control system "brain" of the system to perform an action likened man's "hands", then the sensor is the automatic control of the "eyes", is mechatronics feedback devices. As people's hands when the time to perform an action, we must first ponder through the brain, and then the eye on an object and then perform an action, empathy, an industrial computer to command the actuator to perform an action or command, also we must first through its "eyes" - a sensor to obtain accurate and precise information before I can give the implementing agencies to issue commands, so that the accuracy of the implementing agencies to do the movements of a pre-set in accordance with the implementation of the!
    Sensor signals are analog type and digital type, analog is the size change simulations change in current or voltage measurement of the size of the physical analog signals if the sensor output is already standard signals such as 4-20mA, 0 -20mA, 1-5V, 0-10V, etc. Such sensors are sometimes referred to as the transmitter.
    Electrical sensor is sometimes represented by voltages above a certain field is set at or below a certain domain is set to represent the digital information of 1 or 0, or optical signal through the dark to convey information, such sensors is digital output type.