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..............6 Illustration 2................................5: Simulation receiving circuit with 0,2 input signal....................18 Illustration 4..........3: Block diagram Stellaris LM3S8962 microcontroller [17].....................................................24 Illustration 4..........13: Flowchart ADC peak peak average calculation..8: Non-inverting comparator [3]............................................................26 Illustration 4............12: Flowchart ADC peak peak function...3: Simulation band pass filter with amplifier.....................22 Illustration 4.......................................20 Illustration 4...............................................................................................3 Illustration 2.9 Illustration 2..........................16 Illustration 3......2: Schematic band pass filter and amplifier circuit.....2: Stellaris LM3S8962 Evaluation Board Layout [4].......................................................15 Illustration 3.........17 Illustration 3.....15: Flowchart Temperature measurement and calculation..........................................4: Non-inverting operational amplifier [8]...............LIST IMAGES Illustration 1..................15 Illustration 3..................................................13 Illustration 3.......................10 Illustration 2.......................................6: Single power supplied [9]...........................30 Illustration 4..................................................11: Thermistor connection [12]...............32 Illustration 4.............................4: Flowchart Header files, Global variables and Defines......11: Flowchart GPIO post interrupt function...7 Illustration 2.............25 Illustration 4..............................14: Flowchart Wind speed calculation.2: Oscilloscope capture transmitter and receiver signal........26 Illustration 4....1: Anemometer block diagram.................................................10: Flowchart ADC sample function.........7: Inverting comparator [3]........................8 Illustration 2........................................9: Switched capacitor regulator [5].......19 Illustration 4.............6: Flowchart Main function.................1: Attenuation characteristics sound pressure distance [2]......29 Illustration 4...............................................7: Flowchart Initializations......................12 Illustration 3.........................................33 viii ...............................11 Illustration 2...............................5 Illustration 2.................................................20 Illustration 4............1: Wind speed vector..............................................................................................6: Simulation receiving circuit with input signal.....11 Illustration 2...................................27 Illustration 4.............5: Flowchart Interruption handlers..8 Illustration 2...........................1: Made module board photos.......3: Oscilloscope capture ADC input and comparator output.........10: LT1054 voltage inverter [13]...............28 Illustration 4...............4: Schematic receiving amplifier with comparator..5: Split power supplied [9]..10 Illustration 2........8: Flowchart PWM prepare function..............22 Illustration 4.................................

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