Ultrazvukový anemometr

| Kategorie: Diplomové, bakalářské práce  | Tento dokument chci!

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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..4: Schematic receiving amplifier with comparator.................11: Thermistor connection [12].................17 Illustration 3.........8: Non-inverting comparator [3].....................................11: Flowchart GPIO post interrupt function.........................................................................................................28 Illustration 4...................13 Illustration 3....19 Illustration 4.......25 Illustration 4........................26 Illustration 4.....................................7 Illustration 2.........9: Flowchart Timer post interrupt function....3 Illustration 2........8 Illustration 2...................27 Illustration 4.................5: Split power supplied [9].........5 Illustration 2.......10: LT1054 voltage inverter [13]....................................9 Illustration 2.......15 Illustration 3.............................12: Flowchart ADC peak peak function..6: Simulation receiving circuit with input signal..1: Made module board photos.................................................................18 Illustration 4................................6: Flowchart Main function...................5: Flowchart Interruption handlers.............16 Illustration 3.......................15: Flowchart Temperature measurement and calculation.....11 Illustration 2......LIST IMAGES Illustration 1.11 Illustration 2.............3: Block diagram Stellaris LM3S8962 microcontroller [17]......1: Anemometer block diagram...........................1: Wind speed vector..............................................32 Illustration 4..........................................22 Illustration 4........................................................3: Oscilloscope capture ADC input and comparator output....7: Inverting comparator [3].............................26 Illustration 4..............................................6 Illustration 2.....24 Illustration 4.....................................................................................2: Schematic band pass filter and amplifier circuit......................................................1: Attenuation characteristics sound pressure distance [2].....................12 Illustration 3..9: Switched capacitor regulator [5]...............7: Flowchart Initializations..8 Illustration 2.......................10 Illustration 2........................5: Simulation receiving circuit with 0,2 input signal.........20 Illustration 4.......4: Non-inverting operational amplifier [8]..13: Flowchart ADC peak peak average calculation..........................6: Single power supplied [9].......15 Illustration 3.......10 Illustration 2....................30 Illustration 4.............22 Illustration 4...................................................................................................................................................14: Flowchart Wind speed calculation.....................29 Illustration 4...................2: Oscilloscope capture transmitter and receiver signal.....................2: Stellaris LM3S8962 Evaluation Board Layout [4]............................3: Simulation band pass filter with amplifier...................8: Flowchart PWM prepare function.............20 Illustration 4.........................33 viii ...........................4: Flowchart Header files, Global variables and Defines...............................10: Flowchart ADC sample function.............

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