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Pyroelectric sensors for the security system application

EE552 sensor & actuator. Pyroelectric sensors for the security system application. Instructor: Dr. Mohan Krishnan Team Members: Chun-Chin You Kazi ahmed December 8, 2005. Introduction. Overview of The Infrared Radiation

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Pyroelectric sensors for the security system application

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  1. EE552 sensor & actuator Pyroelectric sensors for the security system application Instructor: Dr. Mohan Krishnan Team Members: Chun-Chin You Kazi ahmed December 8, 2005

  2. Introduction • Overview of The Infrared Radiation • The Pyroelectric Sensor • What is the Pyroelectric Sensor ? • How the Pyroelectric sensor work ? • Project Description • Actual Setup • Limitations • Results • Questions ?

  3. TheInfraredRadiation • Infrared radiation wavelength is longer than visible light. • Objects generate heat and also generate infrared radiation. • objects include animals and the human body whose radiation is strongest at a wavelength of 9.4um.

  4. The Pyroelectric Sensor What is the Pyroelectric Sensor ? • The Pyroelectric sensor is made of a crystalline material • The amount of radiation striking the crystal changes, the amount of charge also changes. • Typical crystalline material • Terbium Gallium Garnet (TGG) • lead titanate zirconate (PZT)

  5. The PyroelectricSensor Microstructures of mixed PZT/alumina

  6. The Pyroelectric Sensor How the Pyroelectric sensor work ? • Work theory • The pyroelectric sensor has two sensing elements.

  7. The Pyroelectric Sensor- Our sensor ( IR 442)

  8. The PyroelectricSensor -The output signal waveform shows that first a positive, -then zero and then a negative transition results

  9. The PyroelectricSensor - Our sensor ( IR 442)

  10. The PyroelectricSensor • Focusing device • The Fresnel lens is made of an infrared transmitting material

  11. Project description • Overview of the system Use the pyroelectric sensor IR 442 servo, and web cam to build the security system.

  12. Project description • System Schematic Record the data Servo2 indicates the max value and holds the position start Max value Servo1 moves, Sensor scans Servo1 and sensor go back to start butnorecordingdata

  13. Actual Setup

  14. Limitations • Don’t let the sensor face to the sun. • Don’t let the sensor close the high heat source. • The scan distance of the detection of the sensor isabout 4.5m in our project .

  15. Results (how did it work?) See !

  16. Questions ? • ???????????????????????????????????

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