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

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