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 Illustration 2............................5: Split power supplied [9]................................................................3 Illustration 2.7 Illustration 2....29 Illustration 4..............22 Illustration 4.................................5 Illustration 2...........................................................8 Illustration 2.............................17 Illustration 3...............................................2: Oscilloscope capture transmitter and receiver signal........2: Stellaris LM3S8962 Evaluation Board Layout [4]...........................13 Illustration 3....15: Flowchart Temperature measurement and calculation..3: Oscilloscope capture ADC input and comparator output........4: Schematic receiving amplifier with comparator........10: LT1054 voltage inverter [13]....................................11: Flowchart GPIO post interrupt function...........................LIST IMAGES Illustration 1...........10 Illustration 2...30 Illustration 4....................................................................15 Illustration 3.........1: Made module board photos......................................................1: Wind speed vector................2: Schematic band pass filter and amplifier circuit..........................4: Flowchart Header files, Global variables and Defines................................................................8 Illustration 2.......................11: Thermistor connection [12]............7: Flowchart Initializations.............................27 Illustration 4....................................................5: Flowchart Interruption handlers...11 Illustration 2.................9: Flowchart Timer post interrupt function..............6: Simulation receiving circuit with input signal..................3: Simulation band pass filter with amplifier..19 Illustration 4.......33 viii .16 Illustration 3...........................12: Flowchart ADC peak peak function......................9: Switched capacitor regulator [5]..................................................10 Illustration 2..........................1: Anemometer block diagram..28 Illustration 4.......20 Illustration 4..........................................................................22 Illustration 4..........6: Flowchart Main function...........18 Illustration 4.......................24 Illustration 4................26 Illustration 4....4: Non-inverting operational amplifier [8]...32 Illustration 4................20 Illustration 4................................11 Illustration 2......................1: Attenuation characteristics sound pressure distance [2].............................6: Single power supplied [9]..................5: Simulation receiving circuit with 0,2 input signal...................7: Inverting comparator [3]................................................................12 Illustration 3...25 Illustration 4.................26 Illustration 4...............10: Flowchart ADC sample function..........................14: Flowchart Wind speed calculation....................8: Flowchart PWM prepare function.........3: Block diagram Stellaris LM3S8962 microcontroller [17]........................................................9 Illustration 2......................13: Flowchart ADC peak peak average calculation..8: Non-inverting comparator [3]...........15 Illustration 3......

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