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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..............................................................................14: Flowchart Wind speed calculation..........................................................8: Non-inverting comparator [3]..................13: Flowchart ADC peak peak average calculation................................27 Illustration 4....................6: Simulation receiving circuit with input signal......................................9: Switched capacitor regulator [5]......3: Simulation band pass filter with amplifier..................4: Flowchart Header files, Global variables and Defines...................10: LT1054 voltage inverter [13]...8 Illustration 2................................................16 Illustration 3...................................................10 Illustration 2..............................11: Flowchart GPIO post interrupt function.....................................................LIST IMAGES Illustration 1......................15: Flowchart Temperature measurement and calculation..............25 Illustration 4........................4: Schematic receiving amplifier with comparator.............4: Non-inverting operational amplifier [8]...............................3 Illustration 2.......................................................26 Illustration 4....................................15 Illustration 3...............................18 Illustration 4.........................12 Illustration 3.....11 Illustration 2...................2: Schematic band pass filter and amplifier circuit...........12: Flowchart ADC peak peak function.....................................19 Illustration 4..........1: Wind speed vector......................10 Illustration 2.....7 Illustration 2..11 Illustration 2.........17 Illustration 3..................22 Illustration 4.........................................5: Simulation receiving circuit with 0,2 input signal....................1: Made module board photos............................................26 Illustration 4...6: Single power supplied [9].....................15 Illustration 3..........................................................1: Anemometer block diagram................11: Thermistor connection [12]........2: Oscilloscope capture transmitter and receiver signal.......5: Flowchart Interruption handlers...6: Flowchart Main function.24 Illustration 4...........................5: Split power supplied [9]................9 Illustration 2...............29 Illustration 4.7: Inverting comparator [3]...........................7: Flowchart Initializations..............................20 Illustration 4................................................10: Flowchart ADC sample function..............................22 Illustration 4.............................3: Oscilloscope capture ADC input and comparator output................................30 Illustration 4.....8: Flowchart PWM prepare function.1: Attenuation characteristics sound pressure distance [2]..........................................2: Stellaris LM3S8962 Evaluation Board Layout [4].......8 Illustration 2.9: Flowchart Timer post interrupt function................28 Illustration 4............6 Illustration 2..........................................................32 Illustration 4.....................5 Illustration 2...20 Illustration 4........33 viii ..13 Illustration 3...............................3: Block diagram Stellaris LM3S8962 microcontroller [17].

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