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posted by janrinok on Thursday October 22 2015, @04:34PM   Printer-friendly
from the fairy-dust dept.

There's an article up on Hackaday on a proposed wireless power transmission system by tech company uBeam.

uBeam transmits power via sound, specifically high intensity ultrasound. uBeam has never demonstrated a prototype, has never released any technical specs, and even some high-profile investors that include [Mark Cuban] have not seen the uBeam working.
...
In what is perhaps the greatest breakdown ever posted on the EEVForums, [georgesmith] goes over what uBeam is, how the technology doesn't make sense, and how far you can take a business before engineers start to say, 'put up or shut up.' [georgesmith]'s research goes over just some of what makes uBeam impractical, but digging even further reveals how insane uBeam actually is.

The article is based on a forum posting by georgesmith titled "The uBeam FAQ" on the EEVBlog which is skeptical of the practicality of the approach, and critical of the reaction of the tech press.

Thousands of startups have technical problems. Why uBeam? Why make this FAQ?

Investors have given uBeam over $23 million. But that's not a big problem. It's their money, they can spend it how they want, and they can afford to lose it.

It's likely that uBeam's product will fail, if it ever launches. But that's not a problem either. Plenty of other companies take unlikely chances, and on the whole, we're better off for it. We can't succeed without failures along the way.

The problem is that uBeam's CEO, Meredith Perry, has turned the wireless power industry into a vehicle for her own self-promotion. uBeam, which has never demoed a prototype, lead Forbes to proclaim "Is this woman the next Elon Musk?"

The homepage of uBeam is also available for the curious.


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  • (Score: 0) by Anonymous Coward on Thursday October 22 2015, @07:21PM

    by Anonymous Coward on Thursday October 22 2015, @07:21PM (#253343)

    Sound follows the inverse square law

    Only if it is emanating from a point source.

  • (Score: 0) by Anonymous Coward on Thursday October 22 2015, @07:59PM

    by Anonymous Coward on Thursday October 22 2015, @07:59PM (#253356)

    You get the inverse square law even with a directional antenna.

    If you assume the beam is within a few arc-seconds, those few arc-seconds will cover more and more area the father away you get from the transmitter.

    • (Score: 0) by Anonymous Coward on Thursday October 22 2015, @09:30PM

      by Anonymous Coward on Thursday October 22 2015, @09:30PM (#253402)

      Yes, but this only applies when you are in the far-field, and that can be quite a distance away before you get there for beamed transmission.