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.

Strana 8 z 49

Vámi hledaný text obsahuje tato stránku dokumentu který není autorem určen k veřejnému šíření.

Více info o tomto dokumentu zde!

Jak získat tento dokument?

Poznámky redaktora

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

---

---