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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..6: Single power supplied [9]............25 Illustration 4..........................................................................1: Attenuation characteristics sound pressure distance [2].............................10 Illustration 2..............................................................11 Illustration 2............4: Non-inverting operational amplifier [8].10: Flowchart ADC sample function...................11 Illustration 2....10 Illustration 2...................14: Flowchart Wind speed calculation......................20 Illustration 4...8: Non-inverting comparator [3]...............................................15 Illustration 3........28 Illustration 4......27 Illustration 4..........................7: Flowchart Initializations................................................................22 Illustration 4...................3: Block diagram Stellaris LM3S8962 microcontroller [17]......2: Oscilloscope capture transmitter and receiver signal.................................................................13: Flowchart ADC peak peak average calculation..........................................6 Illustration 2........5: Flowchart Interruption handlers........5: Simulation receiving circuit with 0,2 input signal...........................LIST IMAGES Illustration 1..................2: Schematic band pass filter and amplifier circuit..8: Flowchart PWM prepare function..3: Simulation band pass filter with amplifier....24 Illustration 4..9: Flowchart Timer post interrupt function.........30 Illustration 4.......12: Flowchart ADC peak peak function..........................................17 Illustration 3..18 Illustration 4........................................................................................16 Illustration 3.....6: Flowchart Main function.............9: Switched capacitor regulator [5].........29 Illustration 4....22 Illustration 4................................................................7: Inverting comparator [3]..............................................................3 Illustration 2.............................33 viii ........12 Illustration 3........................................1: Made module board photos....4: Schematic receiving amplifier with comparator...................................15 Illustration 3................8 Illustration 2............6: Simulation receiving circuit with input signal..................15: Flowchart Temperature measurement and calculation.......5: Split power supplied [9].......................3: Oscilloscope capture ADC input and comparator output........13 Illustration 3......................11: Flowchart GPIO post interrupt function..........19 Illustration 4.....................................26 Illustration 4.....32 Illustration 4.9 Illustration 2.4: Flowchart Header files, Global variables and Defines.....5 Illustration 2...26 Illustration 4............1: Wind speed vector..............................................................................................................................................................11: Thermistor connection [12]...........................20 Illustration 4.................................8 Illustration 2..................................................7 Illustration 2.............10: LT1054 voltage inverter [13]...........2: Stellaris LM3S8962 Evaluation Board Layout [4]...................1: Anemometer block diagram.....................

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