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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.......................................27 Illustration 4.16 Illustration 3.........................5: Flowchart Interruption handlers............26 Illustration 4........29 Illustration 4......10: Flowchart ADC sample function..............10 Illustration 2.........................................26 Illustration 4.........5: Simulation receiving circuit with 0,2 input signal............LIST IMAGES Illustration 1................................9: Flowchart Timer post interrupt function.33 viii ...........12: Flowchart ADC peak peak function.....15 Illustration 3...............................24 Illustration 4...........................................18 Illustration 4......................................11 Illustration 2.....................................................................10: LT1054 voltage inverter [13]...6: Single power supplied [9].......2: Schematic band pass filter and amplifier circuit.........1: Attenuation characteristics sound pressure distance [2].........................30 Illustration 4.......1: Anemometer block diagram......12 Illustration 3.................4: Schematic receiving amplifier with comparator........................22 Illustration 4..11 Illustration 2..........22 Illustration 4................................3: Block diagram Stellaris LM3S8962 microcontroller [17]............................................................15: Flowchart Temperature measurement and calculation..32 Illustration 4....................3 Illustration 2.............20 Illustration 4..........................14: Flowchart Wind speed calculation.............................7: Flowchart Initializations......20 Illustration 4...................17 Illustration 3.......................................................10 Illustration 2....4: Flowchart Header files, Global variables and Defines.............13 Illustration 3................19 Illustration 4...................11: Thermistor connection [12]...................9: Switched capacitor regulator [5]......7 Illustration 2.......................................................15 Illustration 3.....................4: Non-inverting operational amplifier [8]...............................8: Non-inverting comparator [3]...5: Split power supplied [9].....................1: Made module board photos..................................................2: Oscilloscope capture transmitter and receiver signal......................6: Flowchart Main function..........................................................25 Illustration 4..................28 Illustration 4.....................................................................................................................................13: Flowchart ADC peak peak average calculation.....................8 Illustration 2..8: Flowchart PWM prepare function.................2: Stellaris LM3S8962 Evaluation Board Layout [4]...1: Wind speed vector......................................................................9 Illustration 2..............3: Simulation band pass filter with amplifier..............................6: Simulation receiving circuit with input signal.....................3: Oscilloscope capture ADC input and comparator output...................7: Inverting comparator [3]..............................8 Illustration 2....6 Illustration 2..........................5 Illustration 2...........................11: Flowchart GPIO post interrupt function....

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