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

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