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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............8: Non-inverting comparator [3]......................................................................................1: Made module board photos.........................15 Illustration 3..........................8 Illustration 2......................................................................3: Oscilloscope capture ADC input and comparator output......................10 Illustration 2............4: Non-inverting operational amplifier [8]...7: Inverting comparator [3].......26 Illustration 4........22 Illustration 4.9: Flowchart Timer post interrupt function................................................1: Attenuation characteristics sound pressure distance [2]......32 Illustration 4..........4: Flowchart Header files, Global variables and Defines..............................................................................33 viii .....................7 Illustration 2.........................................10: LT1054 voltage inverter [13]...............6: Single power supplied [9]........6 Illustration 2.............................20 Illustration 4................25 Illustration 4.....................6: Simulation receiving circuit with input signal..................................................................16 Illustration 3.......20 Illustration 4....13 Illustration 3....2: Schematic band pass filter and amplifier circuit.................6: Flowchart Main function....9 Illustration 2......................................4: Schematic receiving amplifier with comparator......................................11: Thermistor connection [12]...........5 Illustration 2.....................................................5: Simulation receiving circuit with 0,2 input signal...........................................30 Illustration 4................8: Flowchart PWM prepare function.........3: Simulation band pass filter with amplifier...............................................3 Illustration 2.......27 Illustration 4..................22 Illustration 4...................8 Illustration 2..12: Flowchart ADC peak peak function...........................2: Oscilloscope capture transmitter and receiver signal.................26 Illustration 4...15: Flowchart Temperature measurement and calculation.......................................7: Flowchart Initializations....................3: Block diagram Stellaris LM3S8962 microcontroller [17]..................................................................10 Illustration 2....................10: Flowchart ADC sample function.........5: Flowchart Interruption handlers...........9: Switched capacitor regulator [5]............................19 Illustration 4.2: Stellaris LM3S8962 Evaluation Board Layout [4].............17 Illustration 3.............................11 Illustration 2..............14: Flowchart Wind speed calculation.................11 Illustration 2..........................................................................29 Illustration 4.......................................12 Illustration 3...5: Split power supplied [9]........LIST IMAGES Illustration 1.................................................................1: Anemometer block diagram...13: Flowchart ADC peak peak average calculation..........24 Illustration 4...28 Illustration 4..................11: Flowchart GPIO post interrupt function......18 Illustration 4............15 Illustration 3.........1: Wind speed vector..............

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