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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.........6: Simulation receiving circuit with input signal...................11 Illustration 2.20 Illustration 4..........25 Illustration 4........................................3 Illustration 2......................................................1: Anemometer block diagram...................2: Stellaris LM3S8962 Evaluation Board Layout [4]..15 Illustration 3.......................8 Illustration 2.............................4: Schematic receiving amplifier with comparator....16 Illustration 3....32 Illustration 4.............................15 Illustration 3...............................................................LIST IMAGES Illustration 1........27 Illustration 4.........10: Flowchart ADC sample function....................................................................3: Simulation band pass filter with amplifier..........13 Illustration 3......................12: Flowchart ADC peak peak function.....26 Illustration 4..7 Illustration 2..............................20 Illustration 4................................................................................................28 Illustration 4...........................................................1: Attenuation characteristics sound pressure distance [2]...................11 Illustration 2.................9: Switched capacitor regulator [5]...30 Illustration 4...........................5: Simulation receiving circuit with 0,2 input signal...............18 Illustration 4..............1: Made module board photos.......24 Illustration 4.1: Wind speed vector....................8: Flowchart PWM prepare function.......................10 Illustration 2..2: Schematic band pass filter and amplifier circuit..29 Illustration 4...................10: LT1054 voltage inverter [13]..............................7: Flowchart Initializations............10 Illustration 2............22 Illustration 4..............15: Flowchart Temperature measurement and calculation...9 Illustration 2.................................................8 Illustration 2............................5: Flowchart Interruption handlers......................6 Illustration 2...............................................................11: Thermistor connection [12].............19 Illustration 4................................................7: Inverting comparator [3]..........................................4: Non-inverting operational amplifier [8]..........................26 Illustration 4.................................12 Illustration 3.14: Flowchart Wind speed calculation...........................6: Flowchart Main function.....5: Split power supplied [9].............................6: Single power supplied [9].............................3: Oscilloscope capture ADC input and comparator output.................................................................................................11: Flowchart GPIO post interrupt function..........8: Non-inverting comparator [3]....................................33 viii ......................3: Block diagram Stellaris LM3S8962 microcontroller [17].17 Illustration 3.......................13: Flowchart ADC peak peak average calculation....5 Illustration 2........2: Oscilloscope capture transmitter and receiver signal.................22 Illustration 4........4: Flowchart Header files, Global variables and Defines...9: Flowchart Timer post interrupt function...............................................

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