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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.............................................................................21 4...........................1 Block diagram.............................................3 Measured wind speed and airspeed vectors.......................2 1.............................................................................................................................5 2.............................................................1 1 Theoretical background............1 Description Probe.4 Flowcharts..................1 Header files, Global variable and Defines..............22 4...1 Murata ultrasonic sensors..................................................................4..................8 2........................................1 Printed circuit board......16 4 Implementation....................................................................................................................................................................................................................................................................3 Amplification received signal and comparator.................2 1................................................................................................................13 3.........................................6 2.............21 4................3 Microcontroller.................3 2 Component description..................................................11 3 Analysis and Design..........................................2 Time delay windy conditions and wind speed.......................................................................................................................................................................................................3 Code development.............................3 Main function......................................................................4........................................................................................................2 evaluation board.................................13 3.......21 4.........................................................................2 PWM filter and amplifier......................................................................5 2.........2 Interrupt handler functions.................................................viii Introduction.........................................2 1.....................1 Main Objective............1 Correction speed............................................................................TABLE CONTENT List Images...............7 2.............20 4................................................................10 2........19 4.14 3.............9 2.......4...........................................7 Temperature sensor......23 .....6 Voltage inverter....5 Comparator................................................................................................................4 Non-inverting operational amplifier....................................................................................................2 Oscilloscope captures............................................................19 4...................................................