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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..................................................15 Illustration 3....................................................18 Illustration 4.....................................6: Single power supplied [9]..5: Flowchart Interruption handlers..............................................................6: Simulation receiving circuit with input signal....................................................................4: Flowchart Header files, Global variables and Defines...........................7 Illustration 2.......................28 Illustration 4.......32 Illustration 4.......................22 Illustration 4...4: Non-inverting operational amplifier [8].....................33 viii ...................................................13 Illustration 3...........................9 Illustration 2..................12 Illustration 3....................27 Illustration 4.........30 Illustration 4.1: Attenuation characteristics sound pressure distance [2]...................26 Illustration 4..5 Illustration 2.........................5: Split power supplied [9]...8 Illustration 2....22 Illustration 4................................29 Illustration 4......7: Inverting comparator [3]...................................................16 Illustration 3.............1: Anemometer block diagram.3 Illustration 2..9: Switched capacitor regulator [5].......................................................................................................................15: Flowchart Temperature measurement and calculation...........3: Simulation band pass filter with amplifier....LIST IMAGES Illustration 1....................11: Flowchart GPIO post interrupt function.......................................1: Wind speed vector.25 Illustration 4....20 Illustration 4..............................7: Flowchart Initializations.....20 Illustration 4...........8 Illustration 2.....9: Flowchart Timer post interrupt function...................11: Thermistor connection [12].........2: Oscilloscope capture transmitter and receiver signal.4: Schematic receiving amplifier with comparator.............................2: Stellaris LM3S8962 Evaluation Board Layout [4].......6: Flowchart Main function...........................................10 Illustration 2.................8: Flowchart PWM prepare function................................................15 Illustration 3.......5: Simulation receiving circuit with 0,2 input signal...................26 Illustration 4.......11 Illustration 2..................14: Flowchart Wind speed calculation.........................................17 Illustration 3................11 Illustration 2..1: Made module board photos.......6 Illustration 2........................................................10 Illustration 2...........................3: Block diagram Stellaris LM3S8962 microcontroller [17]............................................2: Schematic band pass filter and amplifier circuit...........12: Flowchart ADC peak peak function....................................13: Flowchart ADC peak peak average calculation........................................................................................10: LT1054 voltage inverter [13].......3: Oscilloscope capture ADC input and comparator output........10: Flowchart ADC sample function................19 Illustration 4.............................24 Illustration 4..........8: Non-inverting comparator [3]................

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