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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, Michelle Tan & Luke Lehman Advisor: Prof. Tim Bigelow Client: Josh Underwood: Atmospheric Systems Corporation. Project Plan.

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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, Michelle Tan & Luke Lehman Advisor: Prof. Tim Bigelow Client: Josh Underwood: Atmospheric Systems Corporation

  2. Project Plan Optimizing the number of times the heater is turned on to reduce power consumption by designing a more efficient and accurate method to detect the conditions in which the SODAR equipment needs to use the heater. The necessary conditions and requirements are outlined below: • Able to tell the difference of snow and ice accumulation on the reflector plate. • Able to detect powdery snow that distorts the SODAR readings and needs to be melted. • Turn heater off after snow has melted.

  3. Piezoelectric sensors plates Temperature Sensor SODAR speakers Heater Concept Sketch

  4. Design Block Diagram Piezoelectric films Amplifier Notch Filter Low-pass Filter Amplifier Temperature Sensor Sample/Hold Microprocessor SODAR

  5. Test Plan • Completed • Obtain several piezoelectric sensor applicable to the project • Small level testing the piezoelectric sensor characteristics to determine the best option • Build circuit components(20%) • Test piezoelectric sensors under specific conditions(50%) • Future • Model circuit components • Obtain microcontroller and programming the microcontroller • Integrate components • High level testing using the completed design

  6. Hardware/ Software • Piezoelectric sensor • Detects sound waves emitted from the SODAR • Minimal power consumption • Differentiate amplitudes of clear reflector versus snow covered reflector • Amplifier • Convert small piezo signal to usable level(0-5V) • Filters • Attenuate signal outside 2-5kHz • Peak Detector • Samples and holds values produced by piezo films for processing • Microcontroller • collect and process data from the temperature sensor and the detector (piezoelectric sensors) • determine whether the heater should be turned on or off based on the data collected

  7. Modeling buffered peak detector Output to microcontroller LM 741 LM 741 Input from piezo amplifier/filter

  8. Building buffered peak detector

  9. Testing Piezofilms

  10. Testing Piezo Films With a 3.5k Hz input and peak detection

  11. Questions ?

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