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........................................................5: Split power supplied [9].............................10: Flowchart ADC sample function............................13: Flowchart ADC peak peak average calculation.............................32 Illustration 4...................14: Flowchart Wind speed calculation........6: Flowchart Main function....2: Stellaris LM3S8962 Evaluation Board Layout [4]............15 Illustration 3..........................................3 Illustration 2.22 Illustration 4........9: Switched capacitor regulator [5]...................26 Illustration 4.....33 viii ..............13 Illustration 3...........................26 Illustration 4............................................................LIST IMAGES Illustration 1...........................................11: Thermistor connection [12]...............8 Illustration 2.....20 Illustration 4.................8 Illustration 2...17 Illustration 3....................25 Illustration 4..................20 Illustration 4..................................................6 Illustration 2...................................................................3: Oscilloscope capture ADC input and comparator output.................................................12 Illustration 3........9 Illustration 2..........................29 Illustration 4.27 Illustration 4..............8: Flowchart PWM prepare function.................2: Schematic band pass filter and amplifier circuit...........................10 Illustration 2........16 Illustration 3........................................6: Simulation receiving circuit with input signal...........9: Flowchart Timer post interrupt function.........6: Single power supplied [9].......10: LT1054 voltage inverter [13]................................18 Illustration 4..........2: Oscilloscope capture transmitter and receiver signal...........15: Flowchart Temperature measurement and calculation........................7 Illustration 2...............................................................7: Inverting comparator [3].3: Simulation band pass filter with amplifier.....1: Anemometer block diagram.......8: Non-inverting comparator [3].................................................................5: Flowchart Interruption handlers.............3: Block diagram Stellaris LM3S8962 microcontroller [17]............................................12: Flowchart ADC peak peak function......................15 Illustration 3..................1: Wind speed vector........4: Non-inverting operational amplifier [8]..................11 Illustration 2........5: Simulation receiving circuit with 0,2 input signal..........11 Illustration 2.....1: Attenuation characteristics sound pressure distance [2]...................30 Illustration 4..........28 Illustration 4...................7: Flowchart Initializations...................................22 Illustration 4..................4: Schematic receiving amplifier with comparator................................10 Illustration 2......................................19 Illustration 4................1: Made module board photos.....................................................................24 Illustration 4...4: Flowchart Header files, Global variables and Defines..................................................................................11: Flowchart GPIO post interrupt function...

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