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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.....................5 Illustration 2......7: Inverting comparator [3]......................................11: Thermistor connection [12].........11: Flowchart GPIO post interrupt function...32 Illustration 4....5: Split power supplied [9]..3: Simulation band pass filter with amplifier...................................................1: Made module board photos.11 Illustration 2..............5: Simulation receiving circuit with 0,2 input signal.........................3: Oscilloscope capture ADC input and comparator output.13 Illustration 3..................6: Simulation receiving circuit with input signal.......4: Flowchart Header files, Global variables and Defines......9: Flowchart Timer post interrupt function.....15 Illustration 3........................................10: Flowchart ADC sample function.......................................................15 Illustration 3................27 Illustration 4.10 Illustration 2...1: Wind speed vector.......................33 viii ...............2: Oscilloscope capture transmitter and receiver signal.............................................................................6: Single power supplied [9]..............7 Illustration 2........................................................26 Illustration 4..........................29 Illustration 4......................................1: Anemometer block diagram....13: Flowchart ADC peak peak average calculation......2: Stellaris LM3S8962 Evaluation Board Layout [4].............20 Illustration 4..................................................8 Illustration 2...................24 Illustration 4........................................................5: Flowchart Interruption handlers............................................................................................................9 Illustration 2...................2: Schematic band pass filter and amplifier circuit...........8: Flowchart PWM prepare function.....16 Illustration 3.....................11 Illustration 2.......3 Illustration 2....25 Illustration 4....3: Block diagram Stellaris LM3S8962 microcontroller [17].......17 Illustration 3...26 Illustration 4.............30 Illustration 4....................................................10: LT1054 voltage inverter [13]..10 Illustration 2................................................28 Illustration 4.............4: Schematic receiving amplifier with comparator...............................................18 Illustration 4..........................14: Flowchart Wind speed calculation.............................................................................8: Non-inverting comparator [3]........12: Flowchart ADC peak peak function.................20 Illustration 4..................LIST IMAGES Illustration 1.............19 Illustration 4...............22 Illustration 4......................................9: Switched capacitor regulator [5]...........................12 Illustration 3....................................................8 Illustration 2......................6 Illustration 2...............1: Attenuation characteristics sound pressure distance [2].....6: Flowchart Main function...................7: Flowchart Initializations.......................15: Flowchart Temperature measurement and calculation.......................................4: Non-inverting operational amplifier [8]..............22 Illustration 4...............................

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