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

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

---

---