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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.........16 4 Implementation................................................6 2.................................3 Microcontroller...1 Printed circuit board....................................................................................................................................................................2 1..4.......................................3 Main function.........................14 3.......5 2..........................................5 2....................................21 4...........2 1.................................................................................................................................................................................................4 Flowcharts...........................................................................2 1....4............................................................................21 4..................................................................................................................................................................................................................................................................................................21 4............3 2 Component description.....................................1 Description Probe.................................................................2 Interrupt handler functions.....4 Non-inverting operational amplifier..........................................1 1 Theoretical background....................................................3 Code development...................................7 2.......4.10 2...............2 evaluation board..................................................................................................................................................20 4..............................................9 2................................1 Header files, Global variable and Defines................2 Oscilloscope captures..............................................5 Comparator................13 3...........................................3 Amplification received signal and comparator...11 3 Analysis and Design.....2 PWM filter and amplifier.........................................................1 Block diagram......8 2........................................................viii Introduction........1 Murata ultrasonic sensors............................................................................................7 Temperature sensor..........................6 Voltage inverter.....................................................19 4...........................................................23 ...........................TABLE CONTENT List Images.........................1 Main Objective..................................................................................2 Time delay windy conditions and wind speed.............................................19 4.........................22 4......................................1 Correction speed.............3 Measured wind speed and airspeed vectors.................................................13 3.........................................................

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