I’m interested in building an ultrasonic anemometer using Arduino. I found a number of articles on the subject; probably the most approachable being the following.
I’m however struggling with some of the concepts.
Under the subject ‘Wind velocity and direction’ the author states…
In this way, the influence of the temperature dependent speed of sound on the measurement result can be eliminated by subtracting the reciprocals of the measured propagation times.
Are they simply saying we are interested in the difference between measured propagation time and benchmark (no wind) for both directions (see attached)?
I’ve many more questions but I’ll leave it there for the time being.
ultrasonic_anemometer.pdf (132 KB)
benchmark.pdf (30.9 KB)