Hi,
I am trying to determine the suitability of the CH201 for roughly detecting the walking speed of people walking towards the sensor in a straight line. Does anyone know whether this application is likely to be possible? Would the 45 degree horn be required to achieve something like this?
Thanks,
Ben
Hi Ben,
This is similar to a question I have just recently sent to TDK.
Using the current CH-101 or CH-201 sensors, you can get the Range and Amplitude information of a target. Of course, if you take a measurement at t=0 and then another one at t=100ms (for example) you can perhaps get an idea of the target speed based on the change in range over the time.
However, a "better" method (which doesn't rely on past data) would be based on the Doppler shift. This can determine speed based on the relative frequency shift in the reflected ultrasonic signal. Currently the TDK sensors can provide de-modulated quadrature (IQ) data. I contacted TDK to see if there is a way to access the modulated data, but they don't seem to reply to any emails I have sent in the past and they're not active on this forum so... I'll see what I can do solo I guess.
If anyone reading this knows how to get target speed from demodulated IQ data, please let me know!