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

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