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Lecture - 1 - introduction to Sensors and Transducers

introduction In automation industry every mechatronic system has some Sensors to measure the status of the process variables. The analogy between the human controlled system and a computer controlled system is describe as follows:- -The operator observes the behavior of the system, makes a decision and then, using his muscular power to take a particular control action is taken. -The Sensors replaces the eyes for observation, actuators replace the muscle, and the computer replaces the human brain. Hisham El-Sherif ELCT903, Sensor Technology Electronics and Electrical Engineering Department 1. Brain for decision making Eye for sensing Muscles for actuation Input Output Process Input Output Hisham El-Sherif ELCT903, Sensor Technology Electronics and Electrical Engineering Department 2. Every computer controlled system has these four basic functional blocks:- 1- Process to be controlled.

Sensors and transducers are often used under environmental conditions, they are sensitive to environmental inputs such as pressure, motion, temperature, radiation and magnetic fields. Sensors characteristic are described in terms of seven properties:-Sensitivity Resolution Accuracy Precision Dr.-Eng. Hisham El-Sherif ELCT903, Sensor Technology

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