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Presented by: Divesh Mittal Steven Lee

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Presentation on theme: "Presented by: Divesh Mittal Steven Lee"— Presentation transcript:

1 Presented by: Divesh Mittal Steven Lee
Automatic Windshield Wiper system E-552 Sensors and Actuators INSTRUCTOR: DR. Mohan Krishnan Presented by: Divesh Mittal Steven Lee

2 Contents Objective / Introduction Physics of Optical Sensor
Practical Setup LabviewTM code/ Flow chart Conclusion / Final Comments Question???

3 Objective Selection and study of particular application of sensor.
Automated windshield wiper system. Prepare demo setup.

4 Automated Windshield Wiper System
What is automated windshield wiper system? Who commercialized it?

5 Significance Active Safety Automation better than manual

6 Possible Transduction Mechanism
Conductive transduction mechanism Piezoelectric transduction mechanism Optical transduction mechanism

7 Where are we?? Objective Physics of Optical Sensor Practical Setup
LabviewTM code/ Flow chart Conclusion / Final Comments Question???

8 Physics of Optical Sensor
Optical sensor works on concept of reflection and refraction. At critical angle of incidence only reflection occurs. Air Glass (a) Reflection and Refraction (b) Total Internal Reflection θr θi θi>θcrit Reflection Refraction Total Internal Reflection

9 Physics of Optical Sensor Contd..
Critical angle of incidence for some material combinations Material Critical angle Windshield Glass / Air 41.15 degree Windshield Glass / Water 61.28 degree Windshield Glass / Ice 59.52 degree Windshield Glass / PVC 76.83 degree PVC / Air 42.52 degree

10 Physics of Optical Sensor contd..
Angle of incidence is kept slightly more than critical angle for Windshield material/air combination. Presence of rain changes critical angle value.

11 Where Are We?? Objective / Introduction Physics of Optical Sensor
Practical Setup LabviewTM code/ Flow chart Conclusion / Final Comments Question???

12 Practical setup Servo Motor Wiper PMMA plate PMMA 90∘Prism
Phototransistor: QSD nm wave length IR LED: QED223 AlGaAs 880nm Resistor: 1KΩ for Phototransistor; 910Ω for IR LED. PCI DAQ 9024E

13 Practical setup 1 2 3 Prisms Air IR LED IR Phototransistor
Measure area Plastic

14 Practical Setup Rain Sensor Measure Area

15 Practical Setup IR Phototransistor IR LED

16 Where Are We?? Objective / Introduction Physics of Optical Sensor
Practical Setup LabviewTM code/ Flow chart Conclusion / Final Comments Question???

17 Labview coding

18 Control Chart IR LED DAQ card Servo Motor Wiper Rain Labview PC
IR Phototransistor DAQ card Servo Motor Wiper Wiper System Rain - Labview PC

19 Demo Video

20 Where Are We?? Objective / Introduction Physics of Optical Sensor
Practical Setup LabviewTM code/ Flow chart Conclusion / Final Comments Question???

21 LabviewTM Results

22 No rain condition

23 Less water on windshield

24 More water on windshield

25 Final Comments/ Conclusion
Mechatronic systems are best option for active safety systems. Rain sensor is effective control system to replace manual wipers.

26 Limitations Motor speed constant Smaller sensitive area

27 Questions

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