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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....................28 Illustration 4........12 Illustration 3...................10 Illustration 2....................5 Illustration 2................................24 Illustration 4..............8 Illustration 2......10: LT1054 voltage inverter [13].................7: Inverting comparator [3].17 Illustration 3....................................29 Illustration 4.................................13: Flowchart ADC peak peak average calculation..............................................................................7: Flowchart Initializations......11: Flowchart GPIO post interrupt function..............................................18 Illustration 4....3 Illustration 2.............4: Non-inverting operational amplifier [8]..........1: Made module board photos.....15 Illustration 3................9: Switched capacitor regulator [5]............3: Block diagram Stellaris LM3S8962 microcontroller [17]......1: Anemometer block diagram...........3: Oscilloscope capture ADC input and comparator output...........................5: Simulation receiving circuit with 0,2 input signal.....................20 Illustration 4........................................................................5: Flowchart Interruption handlers.6: Single power supplied [9]...................26 Illustration 4...................................22 Illustration 4............6: Simulation receiving circuit with input signal......6 Illustration 2...................................3: Simulation band pass filter with amplifier...1: Attenuation characteristics sound pressure distance [2]...................26 Illustration 4............................5: Split power supplied [9]..................................8: Non-inverting comparator [3].......6: Flowchart Main function....................11: Thermistor connection [12]...2: Stellaris LM3S8962 Evaluation Board Layout [4].....................................11 Illustration 2.................LIST IMAGES Illustration 1................15 Illustration 3..........................................................20 Illustration 4.............................................................................2: Oscilloscope capture transmitter and receiver signal.............................2: Schematic band pass filter and amplifier circuit..........16 Illustration 3.9: Flowchart Timer post interrupt function.......15: Flowchart Temperature measurement and calculation...........................................30 Illustration 4.............................27 Illustration 4...........................4: Flowchart Header files, Global variables and Defines....7 Illustration 2..................................13 Illustration 3.......................................................................................11 Illustration 2.......................33 viii ...........................................9 Illustration 2.................4: Schematic receiving amplifier with comparator...............................32 Illustration 4....12: Flowchart ADC peak peak function...........................................22 Illustration 4...............14: Flowchart Wind speed calculation.........................................8: Flowchart PWM prepare function........................10: Flowchart ADC sample function..10 Illustration 2................19 Illustration 4..................25 Illustration 4......................1: Wind speed vector.....8 Illustration 2...........

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