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: Split power supplied [9]..........................................................................7: Inverting comparator [3]....27 Illustration 4....5 Illustration 2.....29 Illustration 4....20 Illustration 4.....................8: Flowchart PWM prepare function.............................2: Stellaris LM3S8962 Evaluation Board Layout [4].........................................8: Non-inverting comparator [3]......................................................6: Single power supplied [9]...............11 Illustration 2...................................9 Illustration 2................................................................................................................12 Illustration 3.............4: Non-inverting operational amplifier [8].....17 Illustration 3.................10 Illustration 2......................................3: Simulation band pass filter with amplifier...........................2: Oscilloscope capture transmitter and receiver signal.................7 Illustration 2..............4: Schematic receiving amplifier with comparator..........20 Illustration 4.7: Flowchart Initializations............13 Illustration 3.....16 Illustration 3..............................3: Block diagram Stellaris LM3S8962 microcontroller [17].....................13: Flowchart ADC peak peak average calculation..........................................................................................................11: Thermistor connection [12].15: Flowchart Temperature measurement and calculation.........................8 Illustration 2..............1: Wind speed vector....................................LIST IMAGES Illustration 1.................................3 Illustration 2..25 Illustration 4...............................................................................1: Anemometer block diagram.............1: Attenuation characteristics sound pressure distance [2].......12: Flowchart ADC peak peak function................14: Flowchart Wind speed calculation..........................9: Flowchart Timer post interrupt function........30 Illustration 4.........................10: LT1054 voltage inverter [13].11: Flowchart GPIO post interrupt function.......................................................9: Switched capacitor regulator [5].....................3: Oscilloscope capture ADC input and comparator output..................................19 Illustration 4..........................................32 Illustration 4...............6 Illustration 2....15 Illustration 3.................................22 Illustration 4.............5: Simulation receiving circuit with 0,2 input signal.22 Illustration 4...1: Made module board photos...............2: Schematic band pass filter and amplifier circuit............4: Flowchart Header files, Global variables and Defines.....................................6: Flowchart Main function.5: Flowchart Interruption handlers...................26 Illustration 4............15 Illustration 3........................................11 Illustration 2..18 Illustration 4.........................................10 Illustration 2...33 viii .....28 Illustration 4..................24 Illustration 4.....................8 Illustration 2....10: Flowchart ADC sample function.............................................26 Illustration 4.............................6: Simulation receiving circuit with input signal...................

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