I am trying to come up with a flow meter for applications that are much larger, where the environment is irregular such as irrigation ditches. They are irregular surfaces that change over time and the environmental factor is highly variable. Running the water through a pipe is not an option. A large structure that is permanent is not an option. The flows range from 0 to floods but precision is in tenths of CFS. Are there flow meters that utilize the doppler effect to measure rate and calculate over an irregular channel using ultrasound or laser or some similar technology?
I haven't explored an aplication like this myself, but I do seem to remember a company promoting a rather uniques sensng technolog, it could have used a Doppler effect, I can't provide any better thoughts at present.
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