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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.......3: Oscilloscope capture ADC input and comparator output.........................................1: Anemometer block diagram..............6 Illustration 2...................8 Illustration 2.......1: Attenuation characteristics sound pressure distance [2].1: Wind speed vector........................................10 Illustration 2......7: Inverting comparator [3]...9: Flowchart Timer post interrupt function.............................4: Non-inverting operational amplifier [8].................5: Simulation receiving circuit with 0,2 input signal.................14: Flowchart Wind speed calculation......7 Illustration 2................6: Flowchart Main function.......................................13 Illustration 3...............29 Illustration 4......................9: Switched capacitor regulator [5].11: Flowchart GPIO post interrupt function..20 Illustration 4............................18 Illustration 4..................................25 Illustration 4.....................................................................................................................17 Illustration 3.........................3 Illustration 2......................26 Illustration 4.................2: Oscilloscope capture transmitter and receiver signal............24 Illustration 4...12: Flowchart ADC peak peak function......................................................11 Illustration 2..........11 Illustration 2...................13: Flowchart ADC peak peak average calculation..........................................................................22 Illustration 4.........................................................................................16 Illustration 3......................10: Flowchart ADC sample function.......8: Flowchart PWM prepare function.......................22 Illustration 4......2: Stellaris LM3S8962 Evaluation Board Layout [4]...15: Flowchart Temperature measurement and calculation...................................................................................................................................5 Illustration 2....7: Flowchart Initializations............................5: Flowchart Interruption handlers.....5: Split power supplied [9].............................4: Flowchart Header files, Global variables and Defines.........9 Illustration 2.............27 Illustration 4....6: Simulation receiving circuit with input signal.10 Illustration 2..3: Simulation band pass filter with amplifier.....19 Illustration 4.........................1: Made module board photos..........................................................33 viii ..............15 Illustration 3..................8 Illustration 2..................................30 Illustration 4..20 Illustration 4...26 Illustration 4.................LIST IMAGES Illustration 1............................................................32 Illustration 4..................................................................15 Illustration 3........................................................................4: Schematic receiving amplifier with comparator.....3: Block diagram Stellaris LM3S8962 microcontroller [17]........................8: Non-inverting comparator [3].11: Thermistor connection [12]............12 Illustration 3....28 Illustration 4.10: LT1054 voltage inverter [13]..........................6: Single power supplied [9].....2: Schematic band pass filter and amplifier circuit.

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