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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.........3: Oscilloscope capture ADC input and comparator output................6: Flowchart Main function.............5 Illustration 2.4: Non-inverting operational amplifier [8]..........17 Illustration 3.3: Block diagram Stellaris LM3S8962 microcontroller [17]....2: Schematic band pass filter and amplifier circuit.............18 Illustration 4.........................1: Anemometer block diagram..............................................................................1: Made module board photos................................9 Illustration 2...26 Illustration 4..24 Illustration 4................................11 Illustration 2.....29 Illustration 4.........5: Flowchart Interruption handlers.......................2: Oscilloscope capture transmitter and receiver signal..............12 Illustration 3...............................6: Single power supplied [9].........................................1: Wind speed vector.....................................................26 Illustration 4....11 Illustration 2...........8 Illustration 2.................8: Flowchart PWM prepare function.......2: Stellaris LM3S8962 Evaluation Board Layout [4]...................22 Illustration 4.....................................8 Illustration 2........15 Illustration 3.......................................32 Illustration 4........................5: Simulation receiving circuit with 0,2 input signal.....30 Illustration 4.15: Flowchart Temperature measurement and calculation.......10 Illustration 2......................14: Flowchart Wind speed calculation.....................27 Illustration 4............3: Simulation band pass filter with amplifier.................................13: Flowchart ADC peak peak average calculation......9: Switched capacitor regulator [5]....3 Illustration 2............4: Flowchart Header files, Global variables and Defines..............................10: Flowchart ADC sample function.....20 Illustration 4.12: Flowchart ADC peak peak function.............................LIST IMAGES Illustration 1.................................................33 viii ........................11: Flowchart GPIO post interrupt function.................6 Illustration 2...4: Schematic receiving amplifier with comparator........................7: Inverting comparator [3]..........................................................................................................................................................28 Illustration 4.6: Simulation receiving circuit with input signal....................................................................................7 Illustration 2....................................13 Illustration 3...................1: Attenuation characteristics sound pressure distance [2].................................10 Illustration 2....................19 Illustration 4............16 Illustration 3...........................20 Illustration 4................................................................7: Flowchart Initializations................................5: Split power supplied [9].........................10: LT1054 voltage inverter [13]............25 Illustration 4............22 Illustration 4.............................11: Thermistor connection [12]...................9: Flowchart Timer post interrupt function..........15 Illustration 3.....................................8: Non-inverting comparator [3]..................................

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