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DEC10-06: Frozen Precipitation Detection System for SODAR Systems

DEC10-06: Frozen Precipitation Detection System for SODAR Systems . by Ashor Chirackal , Imran Butt and Michelle Tan Advisor: Prof. Tim Bigelow Client: Mr. Doug Taylor (John Deere). Purpose.

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DEC10-06: Frozen Precipitation Detection System for SODAR Systems

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  1. DEC10-06: Frozen Precipitation Detection System for SODAR Systems by Ashor Chirackal, Imran Butt and Michelle Tan Advisor: Prof. Tim Bigelow Client: Mr. Doug Taylor (John Deere)

  2. Purpose Optimizing the number of times the heater is turned on to reduce power consumption by designing a more efficient and accurate method to detect snow and ice.

  3. Functional requirements • Power consumption • Lower than the current system. • More efficient in terms of power consumption to delay hibernation mode. • Reduce the number of times the heater is turned on. • Heater Control • Heater should not be used if • smooth and flat ice layer is present. • water or rain is present. • Heater should be used if • there is an accumulation of snow that interferes SODAR operation • Variance of ice on the reflector pad

  4. Functional requirements (cont.) • Frozen Precipitation Detector • can tell the difference between snow and ice accumulation on the reflector pad. • can detect variance on the reflector pad. • must withstand the temperature of the heating pad. • must not interfere with the acoustic environment of the SODAR

  5. Non-functional requirements • Financial • Economical and affordable. • Limited Budget (subsidized by John Deere). • Installation/Manufacturing/ Maintenance • Simple. • Adaptable. • Easy to maintain. • Reliable. • Weather • Must be able to withstand various weather conditions i.e. snow storms, blizzards. • Rain or flat layer of snow or ice will not be an issue as long as they do not disrupt with the operations of the SODAR system

  6. Piezoelectric sensors plates Secondary Sensor SODAR speakers Heater Concept Sketch

  7. System block diagram

  8. Input/Output • Input • Piezoelectric Sensor • Temperature Sensor • Trigger from the SODAR • Output • Generator • Heater

  9. User Interface The Frozen Precipitation Detector is designed to be autonomous. User interface should be kept to a minimum. The microcontroller will be determining optimal heating conditions.

  10. Hardware/ Software • Piezoelectric sensor • Detects sound waves emitted from the SODAR • Minimal power consumption • Must be able to tell the difference in wavelengths between the surface that has precipitation accumulation and a clear surface. • Amplifier • Microcontroller • Should be autonomous • collect and process the data from the temperature sensor and the detector (piezoelectric sensors) • determine whether the heater should be turned on or off based off the data collected • C programming • Used to program the microcontroller

  11. Test Plan • Obtain several piezoelectric sensor applicable to the project • Small level testing the piezoelectric sensor characteristics to determine the best option • Test piezoelectric sensors under specific conditions • Obtain microcontroller and programming the microcontroller • Connect the piezoelectric sensors with the microcontroller and the temperature sensor • High level testing using the completed design

  12. Piezoelectric Film

  13. Testing Setup

  14. Output Without any sound input

  15. Output (Cont.) With a 3.5k Hz. input

  16. Output (Cont.) With a 3.5k Hz input and peak detection

  17. Progress • Completed • Project Plan • Testing the characteristics of the piezoelectric sensors • Future • Order parts necessary to complete the design • Experimenting using the sensors • Implement the design with snow and ice

  18. Current Issues • Finding the right piezoelectric sensor • Ideal piezoelectric sensors are expensive • Need to be custom made • Better amplification system • Find a microprocessor • Installation of the detector • Learn C programming

  19. Deliverables • Frozen precipitation detector • Temperature sensor • Microprocessor • Manufacturing Manual

  20. Work Breakdown • AshorChirackal (Team Leader) • Sensors • Programming • Imran Butt (Webmaster) • Sensors • Programming • Michelle Tan (Communications) • Sensors

  21. Questions?

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