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

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