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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.................29 Illustration 4...........................15 Illustration 3.........................26 Illustration 4...........7 Illustration 2...............4: Flowchart Header files, Global variables and Defines.....................1: Wind speed vector......................5: Flowchart Interruption handlers..........................................................18 Illustration 4............................................32 Illustration 4...............27 Illustration 4..................................................6: Simulation receiving circuit with input signal.........11: Thermistor connection [12]..........................................24 Illustration 4....28 Illustration 4..............10 Illustration 2....................................20 Illustration 4..........................LIST IMAGES Illustration 1.............14: Flowchart Wind speed calculation.3: Simulation band pass filter with amplifier.........................2: Schematic band pass filter and amplifier circuit...................................................................10: LT1054 voltage inverter [13]....................................................1: Attenuation characteristics sound pressure distance [2].....................11 Illustration 2.1: Anemometer block diagram...............................................13: Flowchart ADC peak peak average calculation..............................15: Flowchart Temperature measurement and calculation.....................................17 Illustration 3.........26 Illustration 4.....................................................................................30 Illustration 4..........................8 Illustration 2..9: Switched capacitor regulator [5]............10: Flowchart ADC sample function...............33 viii .........3: Oscilloscope capture ADC input and comparator output.................................2: Stellaris LM3S8962 Evaluation Board Layout [4]........................5 Illustration 2..2: Oscilloscope capture transmitter and receiver signal..................................16 Illustration 3...........7: Flowchart Initializations...................6: Single power supplied [9].........................................8 Illustration 2.............................................1: Made module board photos..............................22 Illustration 4......................9: Flowchart Timer post interrupt function............11: Flowchart GPIO post interrupt function....5: Simulation receiving circuit with 0,2 input signal..4: Non-inverting operational amplifier [8]..................................19 Illustration 4...........3 Illustration 2.........................20 Illustration 4..............6: Flowchart Main function...............3: Block diagram Stellaris LM3S8962 microcontroller [17]......................................................................25 Illustration 4.....22 Illustration 4.....13 Illustration 3........8: Flowchart PWM prepare function...........4: Schematic receiving amplifier with comparator.......10 Illustration 2....12 Illustration 3...............................15 Illustration 3...........9 Illustration 2....8: Non-inverting comparator [3].........................11 Illustration 2.........................................................12: Flowchart ADC peak peak function...........................7: Inverting comparator [3]..6 Illustration 2......5: Split power supplied [9].......

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