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

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