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

..22 Illustration 4..................6: Single power supplied [9]....8: Non-inverting comparator [3]..........................................................................................3 Illustration 2..............................................................................................................5: Simulation receiving circuit with 0,2 input signal.3: Oscilloscope capture ADC input and comparator output.................10: LT1054 voltage inverter [13]........4: Non-inverting operational amplifier [8].........................LIST IMAGES Illustration 1...............6: Simulation receiving circuit with input signal..........................9: Flowchart Timer post interrupt function...............................9: Switched capacitor regulator [5]................................................22 Illustration 4....................................................................29 Illustration 4...........................................26 Illustration 4.....19 Illustration 4.............................16 Illustration 3..................5 Illustration 2............................................17 Illustration 3.......11 Illustration 2.....................15 Illustration 3......8 Illustration 2.................13 Illustration 3..............32 Illustration 4.................5: Flowchart Interruption handlers............18 Illustration 4.................9 Illustration 2........................6: Flowchart Main function.........2: Oscilloscope capture transmitter and receiver signal..............11 Illustration 2..4: Flowchart Header files, Global variables and Defines.7 Illustration 2.33 viii .......14: Flowchart Wind speed calculation...................................11: Flowchart GPIO post interrupt function................................................................10 Illustration 2........................................2: Stellaris LM3S8962 Evaluation Board Layout [4]....15: Flowchart Temperature measurement and calculation...................1: Anemometer block diagram......8: Flowchart PWM prepare function.............1: Made module board photos......7: Flowchart Initializations..............................4: Schematic receiving amplifier with comparator...........2: Schematic band pass filter and amplifier circuit.......................................................12: Flowchart ADC peak peak function....................11: Thermistor connection [12]............................1: Wind speed vector........................13: Flowchart ADC peak peak average calculation.......................................7: Inverting comparator [3]....................................................................8 Illustration 2....27 Illustration 4.........................28 Illustration 4.............................................................30 Illustration 4.............................6 Illustration 2......................................15 Illustration 3.....................20 Illustration 4.............24 Illustration 4............................3: Simulation band pass filter with amplifier........3: Block diagram Stellaris LM3S8962 microcontroller [17].........25 Illustration 4...12 Illustration 3...5: Split power supplied [9]....20 Illustration 4..................................1: Attenuation characteristics sound pressure distance [2]....10: Flowchart ADC sample function...........................26 Illustration 4.10 Illustration 2.

---

---