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

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