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

....25 Illustration 4.......9: Flowchart Timer post interrupt function..6: Single power supplied [9]..............20 Illustration 4..........32 Illustration 4...................................4: Schematic receiving amplifier with comparator...................................24 Illustration 4.......................5: Flowchart Interruption handlers..........................................................11 Illustration 2....................................22 Illustration 4...............................................................................................12: Flowchart ADC peak peak function..........6 Illustration 2..................................................................................8 Illustration 2...9 Illustration 2.........................................................................3: Oscilloscope capture ADC input and comparator output...8 Illustration 2......3: Block diagram Stellaris LM3S8962 microcontroller [17]................27 Illustration 4...............................7: Inverting comparator [3]........11: Thermistor connection [12]......6: Simulation receiving circuit with input signal...15 Illustration 3.........2: Schematic band pass filter and amplifier circuit.........................................................10: LT1054 voltage inverter [13].................................10 Illustration 2.................................3 Illustration 2........18 Illustration 4..........11: Flowchart GPIO post interrupt function..29 Illustration 4.......................................33 viii ..1: Made module board photos.................3: Simulation band pass filter with amplifier.........................28 Illustration 4..............7 Illustration 2....................................5: Split power supplied [9].......19 Illustration 4...........22 Illustration 4..........4: Non-inverting operational amplifier [8]....1: Attenuation characteristics sound pressure distance [2]..................................13 Illustration 3.............................................30 Illustration 4...........11 Illustration 2.................1: Anemometer block diagram..........10 Illustration 2............................5 Illustration 2...................12 Illustration 3...........9: Switched capacitor regulator [5]...6: Flowchart Main function........17 Illustration 3....15 Illustration 3...................1: Wind speed vector............................................7: Flowchart Initializations...........................4: Flowchart Header files, Global variables and Defines..................16 Illustration 3.......................2: Stellaris LM3S8962 Evaluation Board Layout [4]..................15: Flowchart Temperature measurement and calculation.......................................................................................................13: Flowchart ADC peak peak average calculation......................................5: Simulation receiving circuit with 0,2 input signal.8: Flowchart PWM prepare function...............LIST IMAGES Illustration 1....................................................10: Flowchart ADC sample function.....2: Oscilloscope capture transmitter and receiver signal......................8: Non-inverting comparator [3]..................................................26 Illustration 4....20 Illustration 4.14: Flowchart Wind speed calculation...........26 Illustration 4............................

---

---