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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...........................................................................2 PWM filter and amplifier..........................1 Block diagram.5 2..........................................................................................4 Flowcharts.............................................................2 Oscilloscope captures..................11 3 Analysis and Design......5 2..................21 4..........................2 Time delay windy conditions and wind speed.........3 2 Component description................3 Code development.................................16 4 Implementation...8 2.......................................................................................2 1........................................................3 Main function.........1 Correction speed................................................................2 evaluation board............4.........................................................................................................................21 4....................................................................................1 Description Probe...............................................................................20 4.....................4......1 Header files, Global variable and Defines.................................................................................................................................................................................................................................................................................5 Comparator.....13 3.....viii Introduction...................................................................................1 Murata ultrasonic sensors...........................7 2.....................................................................................................TABLE CONTENT List Images..................................................9 2.4 Non-inverting operational amplifier......................................................19 4..................................................2 1.................23 .....................22 4.......2 1.......1 Main Objective..................................................3 Microcontroller.........................19 4.....................................................1 Printed circuit board....13 3.....................................................6 Voltage inverter..................................................................................................................7 Temperature sensor.............................................3 Measured wind speed and airspeed vectors...................................................................................21 4...........................................6 2..................................................................................................................10 2.......................................................................2 Interrupt handler functions.............14 3...........................3 Amplification received signal and comparator..............1 1 Theoretical background................................................................4....

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