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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............2 Oscilloscope captures.........22 4............21 4.......................................................21 4...................7 2...........6 Voltage inverter......6 2.................................................................................................................................10 2.................................................................................................................................................................................................3 Microcontroller.4 Flowcharts...........1 Correction speed..........4.....................................................................................................3 Amplification received signal and comparator...............................................................................................1 Header files, Global variable and Defines........................3 2 Component description..................16 4 Implementation......8 2.13 3.............................23 ............................................................4..........................................................................................................13 3...................................................3 Measured wind speed and airspeed vectors..............................7 Temperature sensor...............4 Non-inverting operational amplifier..................2 1..............................................11 3 Analysis and Design......1 1 Theoretical background........................................20 4.............................................................................................................1 Murata ultrasonic sensors............................................................................................2 evaluation board............................1 Main Objective.......................2 1....1 Block diagram..............................................................................................4.........................................................................................1 Description Probe..............................................................................................................................................2 Interrupt handler functions.....................................................TABLE CONTENT List Images.............................................................................................................5 Comparator...........................................................................................................................................................................9 2.........................................5 2.3 Main function............2 PWM filter and amplifier.....................14 3...........3 Code development..1 Printed circuit board...............................2 Time delay windy conditions and wind speed.................................2 1......................19 4............................................................................viii Introduction........................................................................19 4............21 4.............................5 2........

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