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 Illustration 2..................11: Thermistor connection [12].................................................12 Illustration 3....................................................................5: Flowchart Interruption handlers........32 Illustration 4.2: Schematic band pass filter and amplifier circuit..................4: Schematic receiving amplifier with comparator........................1: Wind speed vector....................................................4: Flowchart Header files, Global variables and Defines..................................4: Non-inverting operational amplifier [8]......7: Flowchart Initializations...................2: Oscilloscope capture transmitter and receiver signal...................29 Illustration 4.....................................3: Block diagram Stellaris LM3S8962 microcontroller [17]......................................8 Illustration 2...........2: Stellaris LM3S8962 Evaluation Board Layout [4]..........11 Illustration 2.................................6: Simulation receiving circuit with input signal.......8: Non-inverting comparator [3]..................7 Illustration 2.......17 Illustration 3..........3 Illustration 2..............10 Illustration 2....5 Illustration 2....18 Illustration 4.......................15 Illustration 3.........................7: Inverting comparator [3]...............................................20 Illustration 4..................26 Illustration 4...............13 Illustration 3..........25 Illustration 4..6: Single power supplied [9]....26 Illustration 4..............22 Illustration 4.............................LIST IMAGES Illustration 1................8 Illustration 2........9: Switched capacitor regulator [5]....................................5: Split power supplied [9]...................................................................................33 viii .....................................13: Flowchart ADC peak peak average calculation...........................................3: Simulation band pass filter with amplifier.15: Flowchart Temperature measurement and calculation..........22 Illustration 4..............10: Flowchart ADC sample function...............11: Flowchart GPIO post interrupt function...........................1: Anemometer block diagram...10: LT1054 voltage inverter [13].10 Illustration 2................30 Illustration 4.......14: Flowchart Wind speed calculation...................................19 Illustration 4...........20 Illustration 4........................................................................................9: Flowchart Timer post interrupt function.......15 Illustration 3..12: Flowchart ADC peak peak function....................27 Illustration 4................................................................................................6: Flowchart Main function..........................................5: Simulation receiving circuit with 0,2 input signal......28 Illustration 4........................................1: Made module board photos...............................................3: Oscilloscope capture ADC input and comparator output...............................1: Attenuation characteristics sound pressure distance [2]...9 Illustration 2...................16 Illustration 3...........11 Illustration 2.....................................................8: Flowchart PWM prepare function....24 Illustration 4.

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