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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...........................................7 2.............................................................................................................2 PWM filter and amplifier.......4 Flowcharts........................................................................................................1 Description Probe................................................................4...............................5 2..........................21 4......................................10 2............2 Time delay windy conditions and wind speed.....................................................................................................8 2......................................................................3 Code development.........7 Temperature sensor..........................19 4.......................................6 2......1 1 Theoretical background....................................................................................................................................2 Oscilloscope captures.......................................................................................2 1....19 4............................................23 .................................................................22 4..........................................................1 Block diagram......................................4 Non-inverting operational amplifier.........................................................................................................20 4...............................................2 Interrupt handler functions......................3 Microcontroller............3 2 Component description..........14 3.........1 Murata ultrasonic sensors.....................................................................................2 1..........................................................................................................................................................................................................16 4 Implementation.......................................................................11 3 Analysis and Design....................................13 3..................................................................................5 2...........................1 Header files, Global variable and Defines.........................................................4...21 4..........................................................3 Main function......................4...............1 Main Objective........................................2 evaluation board..........................................1 Printed circuit board..................5 Comparator................................6 Voltage inverter....................................TABLE CONTENT List Images.................................9 2..............3 Amplification received signal and comparator...................................................................................3 Measured wind speed and airspeed vectors......2 1..........................1 Correction speed............21 4.................viii Introduction.....................................13 3...........................

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