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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......................4: Non-inverting operational amplifier [8].........10: Flowchart ADC sample function........................33 viii ........2: Stellaris LM3S8962 Evaluation Board Layout [4]..................29 Illustration 4..................................13 Illustration 3.5: Simulation receiving circuit with 0,2 input signal..........................9: Switched capacitor regulator [5].....19 Illustration 4.............3: Block diagram Stellaris LM3S8962 microcontroller [17].................................................4: Flowchart Header files, Global variables and Defines.15 Illustration 3.......................................................................5 Illustration 2...............6: Simulation receiving circuit with input signal...................................................4: Schematic receiving amplifier with comparator..27 Illustration 4.......LIST IMAGES Illustration 1..........3: Oscilloscope capture ADC input and comparator output.............11 Illustration 2........................1: Anemometer block diagram.......................................12 Illustration 3................6: Single power supplied [9].................................1: Wind speed vector............................................................7: Flowchart Initializations...............5: Flowchart Interruption handlers....................................13: Flowchart ADC peak peak average calculation....................30 Illustration 4........32 Illustration 4.......25 Illustration 4.......................................................................................................................................26 Illustration 4........1: Made module board photos..................12: Flowchart ADC peak peak function........20 Illustration 4......................16 Illustration 3...7: Inverting comparator [3]................5: Split power supplied [9]............................8 Illustration 2..............26 Illustration 4.......................24 Illustration 4.............17 Illustration 3..............................28 Illustration 4...................2: Schematic band pass filter and amplifier circuit.............................................................9: Flowchart Timer post interrupt function................................................10: LT1054 voltage inverter [13]...................8: Non-inverting comparator [3]...........2: Oscilloscope capture transmitter and receiver signal...15 Illustration 3.3 Illustration 2.........8 Illustration 2...................................11: Thermistor connection [12].....................1: Attenuation characteristics sound pressure distance [2]..............................................................................10 Illustration 2...................................22 Illustration 4.........3: Simulation band pass filter with amplifier............................10 Illustration 2..............................................15: Flowchart Temperature measurement and calculation....14: Flowchart Wind speed calculation....................8: Flowchart PWM prepare function........9 Illustration 2......22 Illustration 4..............................11 Illustration 2.....................18 Illustration 4....................6 Illustration 2....20 Illustration 4.......11: Flowchart GPIO post interrupt function..................7 Illustration 2............6: Flowchart Main function..................

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