Ultrazvukový anemometr

| Kategorie: Diplomové, bakalářské práce  | Tento dokument chci!

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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.

Vydal: FEKT VUT Brno Autor: Michael Dvořácek

Strana 6 z 49

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