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..............23 ...............4..........................................................................22 4....................3 Code development..................2 Oscilloscope captures............................................................................................................................................................................3 Main function...................9 2.........................................................TABLE CONTENT List Images..............................19 4............1 Main Objective............................................................................................................................21 4.............................................................................2 evaluation board......................................................................................................................................................11 3 Analysis and Design...........................................................................1 Block diagram...............2 Time delay windy conditions and wind speed..........................4 Flowcharts..4......................................................................20 4........................21 4...........2 1..............................................................7 Temperature sensor............3 Amplification received signal and comparator...........................3 Microcontroller.......8 2.........16 4 Implementation.......6 Voltage inverter.....4.................................................................................................................1 Murata ultrasonic sensors...........2 1.....21 4...........................2 Interrupt handler functions...................................................14 3..............................3 2 Component description.................................................................10 2.......................................................1 Header files, Global variable and Defines..........................................................................................................................................................................................................................3 Measured wind speed and airspeed vectors...............................viii Introduction..................................................2 PWM filter and amplifier................................................................4 Non-inverting operational amplifier..........1 1 Theoretical background..........................1 Correction speed...............1 Printed circuit board........................................5 Comparator.................................13 3.5 2...............................................19 4.....13 3..................................1 Description Probe.....................................................................2 1..............................................................................................................5 2....................................6 2.......................................................................................................

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