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

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