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wind_sensor:meeting_minutes_apr_28_2017 [2017/04/30 11:33] mwu [Ultrasonic Wind Sensor] |
wind_sensor:meeting_minutes_apr_28_2017 [2021/09/19 21:59] (current) |
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| =====Acoustic Wind Sensor===== | =====Acoustic Wind Sensor===== | ||
| * Updates: | * Updates: | ||
| + | * Inaccuracies in single microphone wind speed algorithm due to assumption that all microphones are set the same way | ||
| + | * To fix this, microphones were re-calibrated individually, each microphone calibrated with 8 wind speeds | ||
| + | * Peak detector coefficients were determined for each microphone | ||
| + | * Raw wind direction tests were conducted from 0 to 360 degrees using the new peak detector equations | ||
| + | * Peak detector outputs of each microphone with the north microphone at 0 to 360 degrees were plotted | ||
| + | * Using this raw data, microphone angle and ratio of the two largest microphone readings at each angle were plotted | ||
| + | * A linear relationship was derived mapping the microphone angle to this raio | ||
| * To Do: | * To Do: | ||
| + | * Conduct tests to verify relationship | ||
| + | * Look at implementing some other filters (i.e. FIR) | ||
| =====Ultrasonic Wind Sensor===== | =====Ultrasonic Wind Sensor===== | ||
| * Updates: | * Updates: | ||
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| * To Do: | * To Do: | ||
| * Instead of just using the first set of times to calculate the difference, try use all ten sets to see if the overall average becomes more stable. | * Instead of just using the first set of times to calculate the difference, try use all ten sets to see if the overall average becomes more stable. | ||
| - | * Add in calculation of wind speed into program so it can print out the calculated wind speed directly, and conduct tests with more wind speeds and the other fan | + | * Add in calculation of wind speed into program so it can print out the calculated wind speed directly, and conduct tests with more wind speeds and the other fan. |
| * Experiment with amplifiers to see if we can increase the SNR (signal-to-noise ratio). This should give us better results. Also, see if we can utilize use the Schmitt trigger's two threshold levels to have one act as a "qualification" and the other as the actual zero-crossing detector. | * Experiment with amplifiers to see if we can increase the SNR (signal-to-noise ratio). This should give us better results. Also, see if we can utilize use the Schmitt trigger's two threshold levels to have one act as a "qualification" and the other as the actual zero-crossing detector. | ||
| - | * See if we can reduce the ringing of the emitter by sending 180-degree phase shifted pulses after we send our actual pulses (destructive interference) | + | * See if we can reduce the ringing of the emitter by sending 180-degree phase shifted pulses after we send our actual pulses (destructive interference). |