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

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