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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..........................................11: Thermistor connection [12]................7: Inverting comparator [3].............................................................................................................1: Attenuation characteristics sound pressure distance [2]..........10: LT1054 voltage inverter [13].....1: Anemometer block diagram...................11: Flowchart GPIO post interrupt function...........................7 Illustration 2...........................................................18 Illustration 4.........................................................6: Flowchart Main function........20 Illustration 4.............................................26 Illustration 4..2: Oscilloscope capture transmitter and receiver signal...............................15 Illustration 3..................11 Illustration 2........................6: Simulation receiving circuit with input signal..19 Illustration 4.................30 Illustration 4..............24 Illustration 4..............................15: Flowchart Temperature measurement and calculation..........................27 Illustration 4.3 Illustration 2..................12: Flowchart ADC peak peak function....4: Schematic receiving amplifier with comparator..4: Flowchart Header files, Global variables and Defines.........................10 Illustration 2......................13: Flowchart ADC peak peak average calculation....................32 Illustration 4.......................................1: Wind speed vector...5: Simulation receiving circuit with 0,2 input signal.............................................................1: Made module board photos....................6: Single power supplied [9].................8: Non-inverting comparator [3].................9: Flowchart Timer post interrupt function........17 Illustration 3......................5: Flowchart Interruption handlers...........................29 Illustration 4..................14: Flowchart Wind speed calculation..........9 Illustration 2................11 Illustration 2.25 Illustration 4................................9: Switched capacitor regulator [5]..5: Split power supplied [9]....7: Flowchart Initializations.................................................26 Illustration 4...8 Illustration 2.........................................................3: Block diagram Stellaris LM3S8962 microcontroller [17].....4: Non-inverting operational amplifier [8].....................2: Schematic band pass filter and amplifier circuit..................2: Stellaris LM3S8962 Evaluation Board Layout [4]................6 Illustration 2......................28 Illustration 4.........................8 Illustration 2..............5 Illustration 2..................................12 Illustration 3...........22 Illustration 4.............................................10 Illustration 2....................16 Illustration 3.........................22 Illustration 4.....15 Illustration 3....33 viii ................................................................................3: Simulation band pass filter with amplifier.LIST IMAGES Illustration 1.....................20 Illustration 4...........................10: Flowchart ADC sample function..........................................................8: Flowchart PWM prepare function............3: Oscilloscope capture ADC input and comparator output..................13 Illustration 3.....

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