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.

Vydal: FEKT VUT Brno Autor: Michael Dvořácek

Strana 42 z 49

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RESULTS There are two parts, which were developing. Program use peripherals from microcontroller to control created hardware. enable PWM and Timer and wait for digital input interruption, let react received signal soon possible. There hasn’t been done any measurements outer conditions with various weather conditions. Written code well documented suitable for further development and improvements. But can estimate preciseness about +/- m/s for both and value of wind speed.1 Hardware We’ve built analog bandpass filter adjust PWM signal. 5. Comparator gives rising edge with higher value than top reference lower value than bottom reference. favor that we’ve obtained kHz harmonic sinus signal. Amplification has been set used all range converter. It use signal strength correction well temperature correction adjust airspeed constant. In practice refers about For calculation last 256 measured time delays used. All created code anemometer file and separated into few functions. Then construct amplifier reach V peak peak its output. Furthermore we’ve used external comparator with amplified received signal its inputs. Both was moved functional version laboratory conditions.2 Software Software was the main part the development. From ultrasonic receiver we’ve obtained 200 peak peak signal. Hardware part with its circuits, components, simulations and module board creation and digital part with its code and its documentation. Program calculate new value axis with every 32th measurement. 5. this amplifier we’ve connected ultrasonic transmitter. We’ve added component and used rail rail operational amplifier amplify input signal. 34 . We were receiving signal from distance. We’ve implemented all circuits one layer printed circuit board suitable connect as module evaluation board. Sensors has been put wooden holders, which keep them rectangular angle between axis