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Precise distance measurement up to 20cm possible?

Dominic Gehweiler
Prodigy 10 points
Other Parts Discussed in Thread: IWR1443, IWR1443BOOST

Hi everyone,

I'm wondering if the mmWave technique is appropriate to measure the distance to a round surface which is displaceable along a defined axis.

The measuring range is up to ~20 cm. Is there a minimum distance?
The accuracy / resolution should be ~0.1mm or better
The measuring frequency should be ~100Hz
The average energy consumption should be not too high because the device is to be operated with lithium-ion batteries.

Is one of the mmWave sensors suitable for this and could you please suggest one?

Many thanks and kind regards,
        Dominic

  • 0
    TI__Mastermind 23725 points

    Hello Dominic,

    mmWave sensors can very well detect distance of objects along desired axis. Detection of object depends on Radar Cross section (RCS) value of the surface, at 20cm most surfaces should be detectable.

    Our out of Box demo can detect objects starting from a few cm.

    There are various high accuracy algorithms available which enable micrometer accuracy measurements on FMCW devices as discussed here : IWR1443: Accuracy of 100 microns

    Update rates can be configured based on sensing needs. In the example implementation which is Out of Box demo included as part of mmWave SDK the update rates are set via a cfg file sent while invoking the demo.

    Power consumption can vary based on application needs and active duty cycle, an example design discussing such a power sensitive application using mmWave sensor devices is covered in Power Optimization for IWR1443 77GHz-Level Transmitter Reference Design.

    Based on the distance measurement needs and power constraints IWR1443 would be suitable for your application needs. You may start with IWR1443BOOST EVM for this device.

    Thank you,

    Vaibhav

  • 0 in reply to Vaibhav Mahimkar
    TI__Mastermind 30405 points
    Hi Dominic,

    I'm closing this thread as there has been no activity on this for more than 2.5 months. Please create a new post if you have further questions.

    Thanks
    -Nitin