Module 4: Proximity Sensors Eng. Asma Abu Baker. Outlines Analog Sensors Digital Sensors Proximity sensors Inductive sensor Capacitive sensor Optical

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    24-Dec-2015

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<ul><li> Slide 1 </li> <li> Module 4: Proximity Sensors Eng. Asma Abu Baker </li> <li> Slide 2 </li> <li> Outlines Analog Sensors Digital Sensors Proximity sensors Inductive sensor Capacitive sensor Optical sensor Ultrasonic sensor </li> <li> Slide 3 </li> <li> Recap Definition: senses the input physical variable and converts it into a measurable signal Sensor / transducerNamePhysical variableMeasurable signal </li> <li> Slide 4 </li> <li> Proximity sensors 1. Ultrasonic Sensor2. Optical sensor 3. Inductive sensor4. Capacitive sensor </li> <li> Slide 5 </li> <li> Ultrasonic proximity sensor can detect solid, liquid, granular and powdery substances </li> <li> Slide 6 </li> <li> Ultrasonic sensor application Detect the object within a specified range. Detection range almost 100 cm measure the distances of the nearby car Detecting the presence of a person Detect the presence of the car </li> <li> Slide 7 </li> <li> Ultrasonic sensor application Sensing Liquid LevelsControl of lifting vehicles </li> <li> Slide 8 </li> <li> Optical proximity sensors Optical proximity sensors are used for counting boxes, breakage and jam detection Almost 10 cm detection range </li> <li> Slide 9 </li> <li> Inductive proximity sensors Inductive proximity sensors are used to detect the presence of metals Detection range is very small. </li> <li> Slide 10 </li> <li> Capacitive proximity sensors Capacitive proximity sensors are used to detect metallic and non-metallic objects such as wood, paper, liquid and so on. Detection range is very small. </li> <li> Slide 11 </li> <li> Counting Application </li> <li> Slide 12 </li> <li> Types of sensors Binary / Digital sensor (switches) Output has two values only Analog sensors Output has many values : Range </li> <li> Slide 13 </li> <li> Temperature o C Thermocouple output 25 o C0.1 mv 30 o C0.3 mv 35 o C0.6 mv 40 o C0.9 mv 45 o C1 mv 50 o C1.3 mv 55 o C1.5 mv Does the thermocouple have only two values or many values ? Many values, then its analog sensor </li> <li> Slide 14 </li> <li> Temperature o C RTD output 30 o C0.114 k 35 o C0.116 k 40 o C0.118 k 45 o C0.12 k 50 o C0.122 k 55 o C0.124 k 60 o C0.125 k Does the RTD have only two values or many values ? Many values, then its analog sensor </li> <li> Slide 15 </li> <li> Temperature o C Thermister output k 251.4 301.1 350.99 400.82 450.7 500.6 550.51 Does the thermistor have only two values or many values ? Many values, then its analog sensor </li> <li> Slide 16 </li> <li> Binary sensors, optical sensor How many values I am reading ? Two values, then its binary sensor </li> <li> Slide 17 </li> <li> Binary sensors, Optical sensor Physical variableMeasureable signal Object exist0 volts Object dont exist24 volts </li> <li> Slide 18 </li> <li> Analog sensors, Ultrasonic sensor How many values I am reading ? </li> <li> Slide 19 </li> <li> Sensors can operate by contact Without contact (Proximity sensors ) They are selected based on the application. Is this sensor operates by contact, or without contact ? </li> <li> Slide 20 </li> <li> Advantages of contactless proximity sensor Precise and automatic sensing of position. Contactless sensing protects objects from damage. Fast response, and do not include moving parts which can wear out. </li> <li> Slide 21 </li> <li> Lab Activity 1 Dont switch on the power supply till I check the circuit for you </li> <li> Slide 22 </li> <li> Select Pulse The clock is S2 </li> <li> Slide 23 </li> <li> Lab Activity 1 1.Connect Optical sensor 2.Connect inductive sensor </li> <li> Slide 24 </li> <li> Conclusion Proximity sensors Proximity sensors application Analog and digital sensors </li> </ul>

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