Ultrazvukový anemometr

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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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.....................17 Illustration 3...................................................................................................3: Block diagram Stellaris LM3S8962 microcontroller [17]......4: Flowchart Header files, Global variables and Defines.....................9 Illustration 2............................14: Flowchart Wind speed calculation.............................3: Simulation band pass filter with amplifier...9: Switched capacitor regulator [5]............11 Illustration 2...............................11: Thermistor connection [12]...6: Single power supplied [9]....11: Flowchart GPIO post interrupt function........................................33 viii .....7: Flowchart Initializations....12 Illustration 3....6: Simulation receiving circuit with input signal......................................5: Flowchart Interruption handlers..............................5: Simulation receiving circuit with 0,2 input signal...........4: Non-inverting operational amplifier [8]...........................9: Flowchart Timer post interrupt function......26 Illustration 4..............................................................................................................................................10 Illustration 2.........3 Illustration 2.....................3: Oscilloscope capture ADC input and comparator output......................................................1: Made module board photos...7 Illustration 2........................................................................................................................................16 Illustration 3....................................................22 Illustration 4...............15 Illustration 3...4: Schematic receiving amplifier with comparator.................2: Oscilloscope capture transmitter and receiver signal.....10: LT1054 voltage inverter [13]...15 Illustration 3........................25 Illustration 4........20 Illustration 4.................15: Flowchart Temperature measurement and calculation.......5 Illustration 2....................26 Illustration 4....28 Illustration 4....................11 Illustration 2.........................12: Flowchart ADC peak peak function..................1: Wind speed vector.............32 Illustration 4.........30 Illustration 4....................10: Flowchart ADC sample function.................6: Flowchart Main function...........................27 Illustration 4...............................22 Illustration 4.........13: Flowchart ADC peak peak average calculation....6 Illustration 2.29 Illustration 4..........................24 Illustration 4..8: Flowchart PWM prepare function...............7: Inverting comparator [3]............................................LIST IMAGES Illustration 1..................13 Illustration 3..............20 Illustration 4..........2: Schematic band pass filter and amplifier circuit.............................18 Illustration 4.......19 Illustration 4..1: Attenuation characteristics sound pressure distance [2].............................................................8 Illustration 2...........................10 Illustration 2........1: Anemometer block diagram............8: Non-inverting comparator [3]...........5: Split power supplied [9]...2: Stellaris LM3S8962 Evaluation Board Layout [4]................8 Illustration 2.....................................................................................

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