Ultrazvukový anemometr

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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.

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

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