Ultrazvukový anemometr

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Práce popisuje principy a problémy při realizaci ultrazvukového anemometru. Je popsán princip výpočtu rychlosti větru a následné korekce výpočtu. Pro realizaci jsou využity ultrazvukové sensory a microcontrolér ARM Cortex-M3. Práce se zabývá generováním PWM signálu, jeho analogovou filtrací, zesílením a odvysíláním. Na přijímací straně jeto nízkonapěťový zesilovač a komparátor. Vyvíjený kód je popsán pomocí vývojového diagramu.

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.........................22 Illustration 4.........LIST IMAGES Illustration 1......5: Flowchart Interruption handlers.........33 viii ...........2: Oscilloscope capture transmitter and receiver signal............................................7 Illustration 2......26 Illustration 4....................7: Inverting comparator [3]..............25 Illustration 4...............8: Non-inverting comparator [3]..................................12 Illustration 3..................2: Stellaris LM3S8962 Evaluation Board Layout [4]........12: Flowchart ADC peak peak function.......................................7: Flowchart Initializations.............4: Non-inverting operational amplifier [8].................15 Illustration 3................................................13: Flowchart ADC peak peak average calculation...........20 Illustration 4...................22 Illustration 4.....................11 Illustration 2............................................................................16 Illustration 3...................13 Illustration 3.............................................30 Illustration 4................................18 Illustration 4............8 Illustration 2............................................6: Single power supplied [9].........................9: Switched capacitor regulator [5]........................5 Illustration 2........................4: Flowchart Header files, Global variables and Defines.............................................................................10: Flowchart ADC sample function...............3: Oscilloscope capture ADC input and comparator output..........17 Illustration 3.............................................................10 Illustration 2...................15: Flowchart Temperature measurement and calculation..........................9 Illustration 2.........27 Illustration 4...........................1: Wind speed vector..15 Illustration 3.............10 Illustration 2.......5: Split power supplied [9]................19 Illustration 4............11: Flowchart GPIO post interrupt function..............3: Block diagram Stellaris LM3S8962 microcontroller [17]..2: Schematic band pass filter and amplifier circuit.4: Schematic receiving amplifier with comparator.......................26 Illustration 4....8: Flowchart PWM prepare function...................................................8 Illustration 2.......................................................................................5: Simulation receiving circuit with 0,2 input signal..................................28 Illustration 4..............3 Illustration 2...........3: Simulation band pass filter with amplifier....6: Flowchart Main function...........................................................................................11 Illustration 2.........1: Made module board photos...........1: Attenuation characteristics sound pressure distance [2]......6: Simulation receiving circuit with input signal.........29 Illustration 4.......................6 Illustration 2.........................................24 Illustration 4.................11: Thermistor connection [12]...........................14: Flowchart Wind speed calculation...............32 Illustration 4.....20 Illustration 4............10: LT1054 voltage inverter [13]...................9: Flowchart Timer post interrupt function................................1: Anemometer block diagram..

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