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

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