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: Non-inverting operational amplifier [8]...13 Illustration 3..............10: Flowchart ADC sample function.................2: Schematic band pass filter and amplifier circuit...........5: Flowchart Interruption handlers....................................................16 Illustration 3.....................9: Switched capacitor regulator [5]...............1: Anemometer block diagram...................................................................................30 Illustration 4..............................................................2: Stellaris LM3S8962 Evaluation Board Layout [4]..33 viii ....................................12 Illustration 3.......6: Single power supplied [9].................................5: Simulation receiving circuit with 0,2 input signal.......24 Illustration 4...22 Illustration 4........................................13: Flowchart ADC peak peak average calculation....3: Block diagram Stellaris LM3S8962 microcontroller [17]......12: Flowchart ADC peak peak function.25 Illustration 4...................3 Illustration 2.1: Wind speed vector....32 Illustration 4.........4: Schematic receiving amplifier with comparator.........15 Illustration 3.................26 Illustration 4................17 Illustration 3......................................8 Illustration 2....1: Made module board photos..................................................................................28 Illustration 4........................................................................................................18 Illustration 4.............................................................11: Flowchart GPIO post interrupt function........6 Illustration 2....................................................8 Illustration 2........................8: Non-inverting comparator [3]...........LIST IMAGES Illustration 1...................20 Illustration 4.15 Illustration 3..........7 Illustration 2.....9 Illustration 2..........27 Illustration 4............6: Flowchart Main function...................3: Simulation band pass filter with amplifier......................................................................4: Flowchart Header files, Global variables and Defines........26 Illustration 4.......................11: Thermistor connection [12]..........7: Flowchart Initializations......8: Flowchart PWM prepare function.10 Illustration 2...................................19 Illustration 4.7: Inverting comparator [3].........................................................11 Illustration 2.................................................9: Flowchart Timer post interrupt function...10: LT1054 voltage inverter [13]........15: Flowchart Temperature measurement and calculation...........10 Illustration 2........3: Oscilloscope capture ADC input and comparator output............................................................................6: Simulation receiving circuit with input signal................................................................................29 Illustration 4....5: Split power supplied [9]...5 Illustration 2.....1: Attenuation characteristics sound pressure distance [2]...........................................14: Flowchart Wind speed calculation..20 Illustration 4.....................22 Illustration 4..................2: Oscilloscope capture transmitter and receiver signal...11 Illustration 2..................................

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